1 Month Student Project My Role: UX Designer Problem: need for a professional cookbook Solution: personalized book Marketed toward individuals who show interest in Chinese-American cuisine
THE PROBLEM
Families around the world use cookbooks to share their favorite recipes and pass them down generations. These families need a way to share their favorite recipes with distant relatives and friends. This cookbook was designed for individuals who share an interest in Chinese-American cuisine and allows people to share well-written and visually annotated recipes.
IMPLEMENTATION
The cookbook was designed using Shutterfly's "advanced editing" design interface. This required importing personalized backgrounds, creating a cusotmized text layouts, and styling imported pictures with corresponding text.
TOUGHEST DECISIONS
The most difficult decision involved designing a layout for each page which represented the particular recipes. The Honey-Glazed Walnuts, for example, required many steps in which illustrations were helpful. The column of images with sequenced steps was intentionally designed to improve usability of the cookbook.
Another difficult decision involves Nielsen's heuristic of consistency. It was important to keep in mind that each recipe required a different amount of images. However, the location of important information such as an overview, cooking time, and servings was purposfeully placed at the top of each recipe page. The font, size, and color of the heading remains consistent across each page. In addition, the overview, cooking time, and servings are consistent in color and location.
IMPACT
This cookbook has an impact on the individuals who wish to create and share Chinese-American cuisine with family and friends. It was carefully constructed to provide clear directions with an intuitive table of contents and layout design for a variety of potential chefs.


{% extends "registration/base_site.html" %} {% load i18n %} {% block bodyclass %}{{ block.super }}login{% endblock %} {% block header-align %}center{% endblock %} {% block title %}{{ title }}{% endblock %} {% block content %}
{% trans "Please enter your new password twice so we can verify you typed it in correctly." %}
{% trans "The password reset link was invalid, possibly because it has already been used. Please request a new password reset." %}


AYS
Categories
Here you will see what is popular with people around you!
People
Here you will find hard-working professionals from your selected category around you that can do work for you! Click on them to see more details.


IsingSampler: Sampling Methods and Distribution Functions for the Ising Model
Sample states from the Ising model and compute the probability of states. Sampling can be done for any number of nodes, but due to the intractibility of the Ising model the distribution can only be computed up to ~10 nodes.
| Version: |
0.2 |
| Depends: |
Rcpp (≥ 0.10.4), R (≥ 3.0.0) |
| Imports: |
plyr, magrittr, nnet |
| LinkingTo: |
Rcpp |
| Published: |
2015-03-02 |
| Author: |
Sacha Epskamp |
| Maintainer: |
Sacha Epskamp <mail at sachaepskamp.com> |
| License: |
GPL-2 |
| Copyright: |
see file COPYRIGHTS |
| URL: |
github.com/SachaEpskamp/IsingSampler |
| NeedsCompilation: |
yes |
| Materials: |
NEWS |
| CRAN checks: |
IsingSampler results |
Downloads:
Reverse dependencies:
Linking:
Please use the canonical form
https://CRAN.R-project.org/package=IsingSampler
to link to this page.


The header menu is part of the hierarchical navigation pattern. It offers the user a shortcut to navigate to different sections of your app without having to first go back home via the back button, and then drill into another section. The items in the header menu should match the various sections of your hub that the user can drill into, plus a home button at the bottom.
Header menus use custom alignment so the edge of the menu aligns with the edge of the text and use custom positioning so that the menu always displays under the header, rather than repositioning if it runs out of room. Header menus use custom width to line up better with the title.


pips Red=120 White=159
(CorrectAnswer= 0/0, ErrorScore= 0)
London basked in the heat of a summer’s day. Even the dogs didn’t have the energy to run around and bark. All the criminals seemed to be on holiday so Holmes and I had very little to occupy ourselves.
After a stroll around nearby Regent’s Park we had settled back into our rooms at 221B where Mrs. Hudson furnished us with some excellent refreshment. Holmes then decried the lack of cases and was very critical of the criminal classes in general.
“Most criminals, Watson, have no idea of how to plan a decent robbery and look no further than the execution of the crime itself. The reason so many of them are caught so quickly is that they do not plan for what happens after the event.”
“That is synonymous with our backgammon discussion the other evening,’ I remarked.
“Indeed, it is, my dear doctor,’ replied Holmes. “As I recall we were discussing this position”, he said and swiftly created the position on the board.
“Precisely so. This is from one of my games with Mycroft. I played this double fours by moving 13/9(2), 10/6(2) without too much thought. In fact, I don’t think I considered any other play. Of course, your brother immediately said, in that somewhat patronising style of his, that I must learn to think before I move. Even now I do not see what I should have done differently.”
“You should join the criminal classes, Watson!,” said Holmes. !3/9(2), 10/6(2) demonstrates a complete lack of forward planning. The move is safe for now but what are you going to do next turn? Your two outside points are both stripped and you may well be forced to break one of them just when you don’t want to.”
“So what is the correct move, Holmes?”
You must both think ahead and look at the whole board. When you do that you will find the move that plays to the demands of the position and that is 13/9(2), 10/2.
“But that play leaves a voluntary double shot,” I cried.
“That is true but how often will White actually hit the blot? He has a one-point home board with a blot in it. In addition, if he hits from your bar-point he will have to give up that valuable point. Meanwhile your move will have created a five-point home board that will be a threat to White for the rest of the game.”
“Good heavens, Holmes. Now that you explain everything so clearly 13/9(2), 10/2 is crystal clear. I wonder I didn’t see it at the time.”
“You didn’t see it, Watson, because you failed to look ahead. Hopefully in future you will balance risk and reward that much better.”
“Thank you, Holmes. A most instructive discussion.”
After a stroll around nearby Regent’s Park we had settled back into our rooms at 221B where Mrs. Hudson furnished us with some excellent refreshment. Holmes then decried the lack of cases and was very critical of the criminal classes in general.
“Most criminals, Watson, have no idea of how to plan a decent robbery and look no further than the execution of the crime itself. The reason so many of them are caught so quickly is that they do not plan for what happens after the event.”
“That is synonymous with our backgammon discussion the other evening,’ I remarked.
“Indeed, it is, my dear doctor,’ replied Holmes. “As I recall we were discussing this position”, he said and swiftly created the position on the board.
“Precisely so. This is from one of my games with Mycroft. I played this double fours by moving 13/9(2), 10/6(2) without too much thought. In fact, I don’t think I considered any other play. Of course, your brother immediately said, in that somewhat patronising style of his, that I must learn to think before I move. Even now I do not see what I should have done differently.”
“You should join the criminal classes, Watson!,” said Holmes. !3/9(2), 10/6(2) demonstrates a complete lack of forward planning. The move is safe for now but what are you going to do next turn? Your two outside points are both stripped and you may well be forced to break one of them just when you don’t want to.”
“So what is the correct move, Holmes?”
You must both think ahead and look at the whole board. When you do that you will find the move that plays to the demands of the position and that is 13/9(2), 10/2.
“But that play leaves a voluntary double shot,” I cried.
“That is true but how often will White actually hit the blot? He has a one-point home board with a blot in it. In addition, if he hits from your bar-point he will have to give up that valuable point. Meanwhile your move will have created a five-point home board that will be a threat to White for the rest of the game.”
“Good heavens, Holmes. Now that you explain everything so clearly 13/9(2), 10/2 is crystal clear. I wonder I didn’t see it at the time.”
“You didn’t see it, Watson, because you failed to look ahead. Hopefully in future you will balance risk and reward that much better.”
“Thank you, Holmes. A most instructive discussion.”
1. Cubeful 2-ply 13/9(2) 10/2 Eq.: +0.309 0.604 0.307 0.003 - 0.396 0.071 0.003 2. Cubeful 2-ply 13/9(2) 10/6(2) Eq.: +0.166 (-0.143) 0.570 0.252 0.003 - 0.430 0.079 0.003 3. Cubeful 0-ply 13/5(2) Eq.: +0.078 (-0.231) 0.543 0.264 0.002 - 0.457 0.114 0.003 4. Cubeful 0-ply 13/9 10/2 10/6 Eq.: +0.012 (-0.296) 0.516 0.230 0.003 - 0.484 0.087 0.003 5. Cubeful 0-ply 13/5 10/2 Eq.: +0.011 (-0.298) 0.515 0.228 0.003 - 0.485 0.084 0.002


Pyrmont Brewery DALL.E 2 training set
To teach the machine learning algorithm about beer brewing and beer styles
Brewery Unitank
Pyrmont Jones Bay with Sydney Harbour Bridge


[gecode-users] strange behaviour of SetVarArray
Guido Tack
tack at ps.uni-sb.de
Thu Mar 5 01:53:56 CET 2009
Stefano,
thanks for the bug report. I just fixed it in the trunk (empty
IntSets now have min=Int::Limits::max and max=Int::Limits::min).
Cheers,
Guido
Stefano Gualandi wrote:
> Hi,
> there is a strange behavior of one of the SetVarArray constructors,
> in the trunk version.
> In practice, if you try to define an array of set variables as
> follows:
>
> x ( *this, 4, IntSet::empty, 2, 4, 0, 4 )
>
> it raises an exception, since it fails the test in the file gecode/
> set/array.cpp at lines 84-85:
>
> 84: if (minCard > maxCard || minCard > lubSize || maxCard <
> glbSize ||
> 85: glb.min() < ubMin || glb.max() > ubMax)
>
> The point is that glb.min() of an empty set is 1 (?).
> Commenting the line 85 seems to fix the problem, but I don't know if
> it breaks some other assumption.
>
> You can find attached the smallest example the show the *behavior*.
>
> cheers,
> Stefano
>
>
> <test.cpp>
> _______________________________________________
> Gecode users mailing list
> users at gecode.org
> https://www.gecode.org/mailman/listinfo/gecode-users
More information about the gecode-users
mailing list


How To Use This for YOUR Next Project :)¶
pip install sphinx
- Copy the
documentation_template_for_your_next_project
folder in this repository,
make it a subdirectory in your local project and rename itdocumentation
. - Edit
conf.py
by searching the pattern#CHNAGEME#
inside the file and follow the instructions. - Edit
index.rst
by following the inline instructions. - To add a page to your documentation:
- Create a
.rst
file for the function/module you wish to document
(you can use the templates supplied here), and - Add the name of the
.rst
file to thetoctree
inindex.rst
.
- Create a
- In terminal, inside the
documentation
folder, runmake html
.
(TIP OF THE WEEK: actually, always runmake clean html
to clear sphinx cache and build from scratch) - To view locally - open the file
documentation/_build/html/index.html
in your browser, and enjoy the read :) - To share - you can use GitHub Pages to host your documentation:
- Copy the content of
documentation/_build/html/
into a newdocs
folder, under the root of the project. - Create an empty file
.nojekyll
insidedocs
folder
(this tells GitHub Pages to bypass the defaultjekyll
themes and use thehtml
andcss
in your project) - Push your changes to master branch.
- In your repository on GitHub, go to “Settings” -> “GitHub Pages” -> “Source”
and select “master branch /docs folder”. - Share your beautiful documentation site at
https://<your_git_usrname>.github.io/<project_name>/
- Copy the content of
When updating your documentation:
- Delete everything in
docs
besides the.nojekyll
file. - Commit your changes.
- Copy the new content of
documentation/_build/html/
intodocs
. - Commit and push your changes.
- Wait a few minutes for your website on GitHub Pages to be updated.
This page was generated using this .rst code:¶
How To Use This for YOUR Next Project :)
========================================
|
.. TIP OF THE HOUR:
The following command allows me to choose line breaks inside a "numbering" environment.
Outside a special environment, i could use
| vertical bars
| to format lines
| to my desire
.. |br| raw:: html
<br />
#. ``pip install sphinx``
#. Copy the ``documentation_template_for_your_next_project`` folder in this repository, |br|
make it a subdirectory in your local project and rename it ``documentation``.
#. Edit ``conf.py`` by searching the pattern ``#CHNAGEME#`` inside the file and follow the instructions.
#. Edit ``index.rst`` by following the inline instructions.
#. To add a page to your documentation:
#. Create a ``.rst`` file for the function/module you wish to document |br|
(you can use the templates supplied here), and
#. Add the name of the ``.rst`` file to the ``toctree`` in ``index.rst``.
#. In terminal, inside the ``documentation`` folder, run ``make html``. |br|
(**TIP OF THE WEEK**: actually, always run ``make clean html`` to clear sphinx cache and build from scratch)
#. To view locally - open the file ``documentation/_build/html/index.html`` in your browser, and enjoy the read :)
#. To share - you can use `GitHub Pages <https://pages.github.com/>`_ to host your documentation: |br|
#. Copy the content of ``documentation/_build/html/`` into a new ``docs`` folder, under the root of the project.
#. Create an empty file ``.nojekyll`` inside ``docs`` folder |br|
(this tells GitHub Pages to bypass the default ``jekyll`` themes and use the ``html`` and ``css`` in your project)
#. Push your changes to master branch.
#. In your repository on GitHub, go to "Settings" -> "GitHub Pages" -> "Source" |br|
and select "master branch /docs folder".
#. Share your beautiful documentation site at ``https://<your_git_usrname>.github.io/<project_name>/``
|
.. topic:: When updating your documentation:
#. Delete everything in ``docs`` besides the ``.nojekyll`` file.
#. Commit your changes.
#. Copy the new content of ``documentation/_build/html/`` into ``docs``.
#. Commit and push your changes.
#. Wait a few minutes for your website on GitHub Pages to be updated.
:ref:`Return Home <mastertoc>`
|
|
This page was generated using this .rst code:
*********************************************
|
.. literalinclude:: how_to_use_this_for_your_next_project.rst


log4js-node
A port of log4js to node.js
View the Project on GitHub
Home
API
Appenders
Layouts
Terminology
FAQ
Want to help?
Contributors
just testing
nothing to see here, move along.


| Method | Description |
constructor |
creates a Buffer |
delete |
Destroys buffer |
initializeData |
Creates and initializes the buffer object’s data store. |
updateData |
Updates a subset of a buffer object’s data store. |
bind |
Binds a buffer to a given binding point (target). |
unbind |
bind(null) |
bindBase WebGL2 |
Binds a buffer to a given binding point (target) at a given index. |
unbindBase WebGL2 |
|
bindRange WebGL2 |
binds a range of a given WebGLBuffer to a given binding point (target) at a given index. |
unbindRange WebGL2 |
|
update |
Updates data in the buffer |
Wraps a WebGLBuffer. A WebGLBuffer is essentially a mechanism to upload memory buffers (attributes) to the GPU (the cost of which can vary depending on whether the system uses a unified memory architecture or not).
Creates a new WebGLBuffer. Also, for all properties set to a buffer, these properties are remembered so they’re optional for later calls.
attribute
value is set in options
then the buffer name will be used as attribute name.gl.ELEMENT_ARRAY_BUFFER
, gl.ARRAY_BUFFER
. Default is
gl.ARRAY_BUFFER
.gl.FLOAT
.stride
parameter when calling gl.vertexAttribPointer
. Default’s 0.offset
parameter when calling gl.vertexAttribPointer
. Default’s 0.gl.bufferData
. Default’s gl.STATIC_DRAW
.Set buffer values for the vertices of a triangle. The context of this example can be seen [here]http://uber.github.io/luma.gl/examples/lessons/1/).


I Love You Token Distribution
I Love You (LOVE) is a full ERC20 cryptocurrency on the ethereum blockchain.
Has no ICO, no Crowdfunding, it's just a TOKEN of LOVE!
I Love You (LOVE) is a full ERC20 cryptocurrency on the ethereum blockchain.
Has no ICO, no Crowdfunding, it's just a TOKEN of LOVE!


Adam G Miller
Entrepreneur
Publisher
Speaker
Investor
Advisor
Humanitarian
Mentor
Human Rights
21 Must Reads
Calender
Adam Vincent Gilmer
Adam Vincent Gilmer’s Top Twenty-One Must Read List:
The Autobiography of Benjamin Franklin, by Benjamin Franklin
Think and Grow Rich, By Napoleon Hill
Success Through a Positive Mental Attitude, by W. Clement Stone and Napoleon Hill
The One Minute Millionaire, by Mark Victor Hansen and Robert G. Allen
Nothing Down, by Robert G. Allen
The Strangest Secret, by Earl Nightingale
Raising Positive Kids in a Negative world, by Zig Ziglar
A Rich Man’s Secret, by Ken Roberts
The Mentor, by Jack Carew
The Monk Who Sold His Ferrari, by Robin Sharma
Acres of Diamonds, by Russell H. Conwell
You Were Born Rich, by Bob Proctor
Who Moved My Cheese?, by Spencer Johnson
The Art of Closing the Sale, by Brian Tracy
The Psychology of Winning, by Denis Waitley
Live Your Dreams, by Les Brown
The 80/20 Principle, by Richard Koch
Why Some Positive Thinkers Get Powerful Results, by Norman Vincent Peale
The Greatest Salesman in the World, by Og Mandino
The Holy Bible & The Dead Sea scrolls
Don't Delay Any Longer
You’re only a click away from changing your life forever…
Let's Get Started


These steps will create a simple table by executing a sample script included with HSQLDB.
From File Explorer, select the data folder under hsqldb.
Double click on file runManager.bat.
A Connect dialog box will appear.
Select HSQL Database Engine Server as the Type, and
enter jdbc:hsqldb:hsql://localhost:9001 as the URL.
Select the Ok button.
A HSQL Database Manager window will appear.
To execute a script, select File - Open Script...
from the menu.
Select the file sampledata.sql in the sample folder.
The script is too long to be viewable in the limited script entry space and
displays This huge file cannot be edited. Please execute.
Select the Execute button.
In the result area, 0 is displayed under the update count column.
To view the created table, select View - Refresh Tree from the menu.
CUSTOMER, INVOICE, ITEM, PRODUCT should appear on the navigator area.
Let's try shutting down the HSQLDB server using the HSQLDB Manager.
Select Command - SHUTDOWN from the menu2.
SHUTDOWN command is entered into the command area and syntax of the shutdown command in shown in the result area.
Select the Execute button.
To exit HSQLDB Manager, select File - Exit from the menu.


OCFR
Home
(current)
Members
Certifications
Reports
Certifications
View Certification
Certification ID
Certifying Agency
Certification Name
Expiration Period (Year)
{{ c.certification_id }}
{{ c.certifying_agency }}
{{ c.certification_name }}
{{ c.expiration_period }}
Certifying Agency
Certification Name
Expiration Period (Year)


12/5/20
That I don't to enforce work hours for programming because I enjoy it so much. I would constantly look forward to 'getting to work' the next day.I'm very good at loosing myself down rabbit holes, I will spend hours trying to sort something small out if I know I can. That leads to the third thing - I find it very hard to admit defeat, if I get lost and I've used up all available learning avenues (google, asking for help) I still cant move on until its perfect.
Empathy and self awareness are very important, as shown in the last point in the previous question. If I had better self awareness and empathy towards myself I could move on. Often moving on and coming back later works things out!
How much of it I was already aware of - Mindfulness has been a core part of my life for a long time!
I guess the looping things. Talking to a stranger (soon to be friend) for two minutes straight was weird. Listening was even weirder!
Its a part of the learning process. If you want to work in the programming industry theres more you need to learn than just programming.
No, I understand where yall are coming from. Nowadays the computer dev isn't some person locked in a room, only allowed out once they've finished their job. YOu have to know how to interact with others if you want to be successful in this industry
My long term goal will be to find a career in the programming industry and to work my way up from there. I would hope to work in an environment where I can learn but also do my own thing. I have always thought I would prefer working in a workplace setting but this lockdown has got me enjoying programming from home again - with no distractions!
I think my biggest strength is my passion for learning and helping others where I can. I feel that asking questions is important and trying to answer them even if you're not to sure. I've realised over the foundation period that one of my biggest limitations is not being able to let things go. I will get something working great but then spend 10 more hours making it perfect when it doesn't need to be. Get it working well, move on, come back if need be
I think that showing people my work will be the hardest part. spending hours/days on something then showing someone my work for critiquing will be nerve racking. What if its not good enough? what if its bug filled etc etc. what if it isn't PERFECT. Even work that I've worked on with others. What will others think of it...
I think working on my feelings towards the answer above. Work on giving and receiving feedback. I also think developing leadership skills is important, as freelance work in teh industry can be quite lucrative. To be good at it you have to have drive and ability to work with clients one on one. Those skills would be important to learn.
Be collaborative - make sure that the alone time programming is mixed up with group programming. Be social. Make sure to realise the context of the environment. It will be stressful. Manage that stress. Be excited to ask for help, I will be surrounded by people who know things I don't, so use it!


CommerceGate Press Release
BARCELONA - CommerceGate, leading European billing solutions provider, today announced…


Welcome, here's the first step to contruct a 3D cube with perspective
change: Fix your center and create three handles that will represent the
three dimensions.
You can drag the handles around. Try it!
You can disable the debug (gray dotted lines) with the checkbox, and go
to the next step with the step dropdown.
We compute the points at the center of the exiting lines.
We then create new lines between the handles and those new points, you
can see the front of the cube starting to appear.
Now let's add the intersection points between all those new lines. They are the corners of our cube.
Maybe it's clearer with strong lines, can you see the cube now?
We have our three "front" faces of our cube, but the "back" ones are missing, let's add them now!
We can create the last point by finding the intersection between the lines from the handles to their oposite intersection points.
Let's remove all points and trace the remaining lines, and voilà!


http://www.speakers-podium.com/susangranger.
Susan Granger's review of "U-571" (Universal Pictures)
Brace yourself, the first popcorn picture of the season has arrived! "U-571" has everything you could want in an action-adventure. Set against the backdrop of World War II, when Hitler launched a devastating U-boat assault against the Eastern seaboard of the United States, it revolves around a daring mission to capture an Enigma machine, a top-secret Nazi radio coding device. But the crux of the story involves a young executive officer, played by Matthew McConaughey, who proves his leadership ability in a crisis situation when his submarine crew is deployed to answer the distress call of a stranded German U-boat. Their assignment is to masquerade as a resupply ship and, wearing German uniforms, board the damaged vessel and seize its Enigma encrypting device.  But everything that can go wrong does, as the cleverly constructed script poses several dilemmas and one complication after another. Directed and co-written by Jonathan Mostow ("Breakdown"), it's a taut, exciting tale of historical fiction, a composite of actual events, not revisionist history, which an important point which is made clear in the closing credits. Matthew McConaughey shows remarkable emotional dimension, ably supported by Harvey Keitel, Bill Paxton, David Keith, Jack Noseworthy, Erik Palladino, Tom Guiry and Jon Bon Jovi. And cinematographer Oliver Wood captures the claustrophobic emotional stress of being in the path of deadly torpedoes and depth charges and, even more terrifying, the helpless, eerie silence of expectation. On the Granger Movie Gauge of 1 to 10, "U-571" is an action-packed, explosive 8. If you're into ferociously suspenseful, high-tension thrillers: go, go, go!
The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
The Internet Movie Database accepts no responsibility for the contents of the
review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
to ASCII to HTML conversion.
Related links: index of all rec.arts.movies.reviews reviews


Pitas, John Clinton B.
Obulan,Beckel L.T.B, Baguio City, BO 044 | Cell no:<PHONE_NUMBER>2
<EMAIL_ADDRESS>To take a position as a software programmer and Web Developer.
Junior Developer, Software Company (2010 - Present)
Software and Animation Designer
Languages: C#, JavaScript, Python, Ruby
Frameworks: .NET, Node.js, Django, Ruby on Rails
BS, Information Technology, University of the Cordellera's


Darts results: Watch Michael van Gerwen hit a televised nine-dart finish at the Players Championship Finals
by Sporting LifeThe wait for a televised nine-dart finish in 2019 is over after Michael van Gerwen hit a perfect leg during his dramatic victory over Adrian Lewis at the Players Championship Finals.
The world number one sparked wild scenes of celebration at the Butlin's Minehead Resort when following up two successive visits of 180 and 177 with a stunning finish from 144 on his way to the third round.
Returning in the evening, van Gerwen threatened to throw another but instead had to settle for a 105.96 average on his way to a 10-6 victory over James Wade, which sealed a quarter-final place.
In the afternoon session, van Gerwen was almost guilty of taking his eye off the job at hand as he missed four match darts in the next leg to allow Lewis back into it with a 13-darter, before he then forced a decider.
Van Gerwen had the advantage of throw and although he was up against it when Lewis left himself 40 after 12 darts, the world champion held his nerve to take out 76 and complete a remarkable win.
It's the Dutchman's 22nd perfect leg of a sensational career and the sixth he's managed in front of the live TV cameras, having memorably last achieved it against Rob Cross at the UK Open of 2016.
Until today, there had been a record 46 perfect legs on the PDC circuit in 2019, which smashed the previous mark of 29 set in 2015 and subsequently equalled in 2018, but none of them had been in front of the live television cameras.
The last person to achieve that feat was Dimitri van den Bergh at the 2018 Grand Slam of Darts on November 14 during his second-round win over Stephen Bunting, until van Gerwen ended the drought.
Alan Norris had been the only player previously in the event to achieve a nine-darter, with his achievement coming on Stage Two in the 2016 tournament.
"The nine-darter is always nice," said Van Gerwen. "Adrian was pushing me and put me under pressure, so you have to do the right things at the right moments."
Van Gerwen had gone on to stress that he'd have to do better, and that's exactly what he did - even if a second nine-darter proved elusive - to go from 6-6 with Wade to running out a comfortable winner.
He said: "I think it was a great game to watch against James. I had to dig deep but I missed some darts early on and I was behind him so I had to work really hard.
"I did the right things at the right moments against both Adrian and James but now I have to focus on the final day. I know I have got more in my power and I want to show that."
MVG is favourite to bounce back from last week's disappointment at the Grand Slam of Darts and add to his haul of 13 titles this season, and eighth on TV.
Next for the four-time champion is a meeting with Mervyn King, who averaged 105.09 in a surprisingly comprehensive 10-4 victory over Rob Cross that was sealed with a 131 checkout .
The 2010 finalist followed up his fine 6-4 win over Dave Chisnall in round two with another superb performance, despite battling the pain of a sciatic nerve problem.
"I'm really pleased to be through because when my sciatica starts then you can't get rid of it, and if the game with Rob had gone on much longer I might not have lasted," said King, who beat MVG in Minehead at the UK Open back in March.
"I'll rest now and get myself ready for the quarter-finals because I've beaten Michael before and I can do it again."
Staying in this half of the draw, Ian White earned himself a ninth televised quarter-final after he averaged 107.46 in a 10-4 victory over Michael Smith that was far more one-sided than his battling 6-5 triumph over Vincent van der Voort during the afternoon.
Diamond has not won any of his previous eight - the last of which coming at the World Series of Darts Finals - but he'll be favourite to break new boundaries in his career when he faces William O'Connor.
"It's nice to be through," said White. "I'm playing good darts and I want to keep this going tomorrow. I had a tough game in the afternoon but everything went in for me tonight and I felt good."
O'Connor secured his spot in the last eight of a televised singles tournament for the first time after following up his eye-catching 6-3 victory over Poland's Krzysztof Ratajski with an even more impressive 10-7 success over German star Gabriel Clemens.
"Gabriel has been in savage form so it's a huge game to get over him, and I'll prepare for one big game on Sunday now in the last eight and see how that goes," said the 33-year-old from Ireland.
"I want to be more consistent and I have to work on that, but I have my chance now and I want to take it."
In the top half of the draw, Gerwyn Price's bid for back-to-back TV titles continues apace after convincing wins against Keegan Brown and Mensur Suljovic.
The two-time Grand Slam of Darts champion whitewashed Brown 6-0 in a ruthless display before upping his average above the hundred mark in a 10-4 victory over Suljovic, where he defied a slow start to run out an easy winner.
"I'm happy to get through to the last day but I've got a lot more in the tank and hopefully I can bring it out tomorrow," said Price.
"I was slow out of the blocks against Mensur so to average 102 is great - but I will need to play better to take this title. I won't take anything for granted, I'll just focus on my next game."
The Welshman goes on to face Stephen Bunting, who aside from van Gerwen's heroics was the star of Saturday as he averaged 104.62 and 107.03 in defeats of Jose de Sousa and Ryan Meikle.
After a 6-3 win in the afternoon, former BDO champion Bunting was knocking around the 115 mark for much of his stroll against Meikle, the promising 23-year-old who found this a step to far.
Raymond van Barneveld's farewell season could reach a high in Minehead as he defeated Joe Cullen 6-3 before thrashing Glen Durrant 10-3.
The five-time world champion even won a leg in which the three-time Lakeside king missed double 12 for a nine-darter despite being back on 301 at the time.
"I feel good and I'm happy because I've been playing well," said Van Barneveld. "It's a massive win against a three-time World Champion, and even though Glen wasn't at his best I'm really happy to be through.
"I've been practising hard on my doubles and I've got nothing to lose. I was under pressure earlier in the year to qualify for things but that's gone now and I'd love to play a couple of games more and maybe reach the final here."
Van Barneveld's quarter-final opponent will be Chris Dobey, who whitewashed James Wilson in round two before coming from 5-2 down to defeat John Henderson 10-5.
Dobey also reached the last eight 12 months ago, and admitted: "I'm relieved to be through to the final day and hopefully I can keep progressing.
"I'm confident in my game, I'm playing well and my doubles are going in. I felt good today and against John I came back with all guns blazing."
CLICK HERE FOR FULL TOURNAMENT RESULTS & SCHEDULE
Saturday results and Sunday schedule
Afternoon Session (12.45pm)
Second Round (Best of 11 legs)
Main Stage (TV Coverage: ITV4)
- Gerwyn Price 6-0 Keegan Brown
- James Wade 6-1 Ricky Evans
- Mensur Suljovic 6-5 Danny Noppert
- Luke Woodhouse 3-6 Gabriel Clemens
- Adrian Lewis 5-6 Michael van Gerwen
- James Wilson 0-6 Chris Dobey
- Ramond van Barneveld 6-3 Joe Cullen
- Jamie Hughes 4-6 Rob Cross
Stage Two
- Simon Whitlock 3-6 John Henderson
- Ryan Meikle 6-5 Darius Labanauskas
- Jose De Sousa 3-6 Stephen Bunting
- Ian White 6-5 Vincent van der Voort
- Krysztof Ratajski 3-6 William O'Connor
- Glen Durrant 6-5 Max Hopp
- Dave Chisnall 4-6 Mervyn King
- Michael Smith 6-4 Brendan Dolan
Evening Session (7pm)
Third Round (Best of 19 legs)
TV Coverage: ITV4
Main Stage
- Gerwyn Price 10-4 Mensur Suljovic
- James Wade 6-10 Michael van Gerwen
- Glen Durrant 3-10 Raymond van Barneveld
- Mervyn King 10-4 Rob Cross
Stage Two
- Stephen Bunting 10-2 Ryan Meikle
- William O'Connor 10-7 Gabriel Clemens
- Chris Dobey 10-5 John Henderson
- Ian White 10-4 Michael Smith
Sunday November 24
Afternoon Session (12.45pm)
Quarter-Finals (Best of 19 legs)
TV Coverage: ITV4
Main Stage
- Stephen Bunting v Gerwyn Price
- Raymond van Barneveld v Chris Dobey
- Michael van Gerwen v Mervyn King
- Ian White v William O'Connor
Evening Session (7pm)
TV Coverage: ITV4
Semi-Finals (Best of 21 Legs)
- Two Matches
Final (Best of 21 legs)
- Winner SF 1 v Winner SF 2


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Almost all modern applications have a splash screen. Typically splash screens are used for the following purposes:
Java Foundation Classes, both Swing and Abstract Windowing Toolkit (AWT), enable a developer to create splash screens in Java technology applications. However, because the main purpose of a splash screen is to provide the user with feedback about the application's startup, the delay between the application's startup and the moment when the splash screen pops up should be minimal. Before the splash screen can pop up, the application has to load and initialize the Java™ Virtual Machine (JVM), AWT, Swing, and sometimes application-dependent libraries as well. The resulting delay of several seconds has made the use of a Java™ technology-based splash screen less than desirable.
Fortunately, Java™ SE 6 provides a solution that allows the application to display the splash screen much earlier, even before the virtual machine starts. A Java application launcher is able to decode an image and display it in a simple non-decorated window.
The splash screen can display any gif
, png
, or jpeg
image,
with transparency, translucency, and animation.
The figure below represents an example of the Java application splash screen developed as an animated gif
file.
The
SplashScreen
class is used to close the splash screen, change the splash-screen image, obtain the image position or size,
and paint in the splash screen.
An application cannot create an instance of this class. Only a single instance created within this class can exist,
and this instance can be obtained using the getSplashScreen()
static method.
If the application has not created the splash screen at startup through the command-line or manifest-file option,
the getSplashScreen
method returns null.
Typically, a developer wants to keep the splash-screen image on the screen and display something over the image.
The splash-screen window has an overlay surface with an alpha channel,
and this surface can be accessed with a traditional Graphics2D
interface.
The following code snippet shows how to obtain a SplashScreen
object,
then how to create a graphics context with the createGraphics()
method:
... final SplashScreen splash = SplashScreen.getSplashScreen(); if (splash == null) { System.out.println("SplashScreen.getSplashScreen() returned null"); return; } Graphics2D g = splash.createGraphics(); if (g == null) { System.out.println("g is null"); return; } ...
Find the demo's complete code in the
SplashDemo.java
file.
The native splash screen can be displayed in the following ways:
To display a splash screen from the command line use the -splash:
command-line argument.
This argument is a Java application launcher option that displays a splash screen:
java -splash:<file name> <class name>
SplashDemo.java
file.splash.gif
image in the images
directory.java -splash:images/splash.gif SplashDemo
nnn.gif
.
Run the application as follows:
java -splash:images/nnn.gif SplashDemo
SplashScreen.getSplashScreen() returned null
If your application is packaged in a JAR file, you can use the SplashScreen-Image
option
in a manifest file to show a splash screen. Place the image in the JAR file and specify the path in the option as follows:
Manifest-Version: 1.0 Main-Class: <class name> SplashScreen-Image: <image name>
SplashDemo.java
file.splash.gif
image in the images
directory.splashmanifest.mf
file as follows:
Manifest-Version: 1.0 Main-Class: SplashDemo SplashScreen-Image: images/splash.gif
jar cmf splashmanifest.mf splashDemo.jar SplashDemo*.class images/splash.gif
java -jar splashDemo.jar
The SplashScreen
class cannot be used to create the splash screen. Only a single instance created within this class can exist.
| Method | Purpose |
|---|---|
| getSplashScreen() |
Returns the SplashScreen object used for Java startup splash screen control.
|
| createGraphics() | Creates a graphics context (as a Graphics2D object) for the splash screen overlay image,
which allows you to draw over the splash screen.
|
| getBounds() | Returns the bounds of the splash screen window as a Rectangle .
|
| close() | Closes the splash screen and releases all associated resources. |
| Example | Where Described | Notes |
|---|---|---|
SplashDemo
|
This section | Shows a splash screen before opening the application window. |


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When we create a new API with Wheel, it generates by default three resources: Sessions, Myself and Users. Each one has its own routes (check file /app/root/path/routes/routes.go) and access permissions (check file /app/root/path/routes/authorization.go).
Quick tips!
Also, they share functionalities between theirs models, views and handlers.
To test the API resources, we recommend you to use the Postman client software. But feel free to choose another similar tool.
If you didn't change the default admin credentials, here they are:
|<EMAIL_ADDRESS>| |
| password | Secret123! |
Very important!
Use these credentials, above, to sign in as an admin user. Make sure you already have ran the migration.
$> go run main.go -mode=migrate
Sessions manage user's access to the API. Its services are: sign up, sign in, sign out, password recovery and session refresh.
The public of the internet can sign up, but they can't sign up as an admin user.
Only an admin user can create others admins. We are going to deep in details at Users section.
POST /sessions/sign_up
Payload:
curl -X POST -H 'Content-Type: application/json' \
-d '{ \
"name": "Your Name", \
<EMAIL_ADDRESS>\
"password":"Secret123!", \
"locale":"en" \
}' \
http://localhost:8081/sessions/sign_up
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| name | New user's name | String | Yes |
| New user's email | String | Yes | |
| password | New user's password | String | Yes |
| locale | New user's locale. Available locales are "pt-BR" and "en" | String | Yes |
{
"system_message": {
"type": "notice",
"content": "signed in successfully"
},
"token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9....",
"expires": 7200
}
On error:
{
"system_message": {
"type": "alert",
"content": "user was not created"
},
"errors": [
...
]
}
Available errors are:
Users with a valid credential can sign in the system. Upon successful sign in, the user will recieve a JWT-based token and an expiration time in seconds. It means that you need to provide the token in furthers requests to get access. Be aware to update the token before it get expired calling the session refresh service.
POST /sessions/sign_in
Payload:
curl -X POST -H 'Content-Type: application/json' \
-d '{ \
<EMAIL_ADDRESS>\
"password":"Secret123!", \
}' \
http://localhost:8081/sessions/sign_in
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| User's email | String | Yes | |
| password | User's password | String | Yes |
{
"system_message": {
"type": "notice",
"content": "signed in successfully"
},
"token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9....",
"expires": 7200
}
On error:
{
"system_message": {
"type": "alert",
"content": "could not sign in"
},
"errors": ["invalid credentials"]
}
Sign out for signed in users.
DELETE /sessions/sign_out
Payload:
curl -X DELETE -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081/sessions/sign_out
On success:
{
"system_message": {
"type":"notice",
"content":"signed out successfully"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "access denied"
},
"errors": ["invalid token"]
}
Kick off to password recovery.
The target user will receive an email with the instructions.
POST /sessions/password
Payload:
curl -X POST -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
-d '{ \
<EMAIL_ADDRESS>\
}' \
http://localhost:8081/sessions/password
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| User's email | String | Yes |
{
"system_message": {
"type": "notice",
"content": "user password recovery instructions was successfully sent"
}
}
Very important!
To avoid user enumeration vulnerability there's no error message.
Confirms password recovery.
PUT /sessions/password
Payload:
curl -X PUT -H 'Content-Type: application/json' \
-d '{ \
"token": "jksdfn983489jd9832mksd09", \
"new_password":"Secret.456", \
"password_confirmation":"Secret.456" \
}' \
http://localhost:8081/sessions/password
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| token | Recovery passoword token | String | Yes |
| new_password | New password | String | Yes |
| password_confirmation | Password confirmation | String | Yes |
{
"system_message": {
"type": "notice",
"content": "password was successfully changed"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "password could not be changed"
},
"errors": [
...
]
}
Available errors are:
Refreshes the session. Returns a new JWT-based token and a new expiration time in seconds.
POST /sessions/refresh
Payload:
curl -X POST -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081/sessions/refresh
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| token | Session token | String | Yes |
{
"system_message": {
"type": "notice",
"content": "session was successfully refreshed"
},
"token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
"expires": 7200
}
On error:
{
"system_message": {
"type": "alert",
"content": "access denied"
},
"errors": ["invalid token"]
}
Myself are services whose the users can change their own password, read their own personal data and update them.
Returns current user's personal data.
GET /myself
Payload:
curl -X GET -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081/myself
On success:
{
"id": 1,
"name": "User Name",
"email"<EMAIL_ADDRESS>"created_at": "2019-08-08T01:21:37.351901Z",
"updated_at": "2019-08-08T01:21:37.351901Z"
}
On error:
{
"system_message": {
"type": "alert",
"content": "access denied"
},
"errors": ["invalid token"]
}
Updates current user's personal data.
PUT /myself
Payload:
curl -X PUT -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
-d '{ \
"name" : 'My New Name', \
"email"<EMAIL_ADDRESS>\
"locale" : 'en' \
}'
http://localhost:8081/myself
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| name | New user's name | String | No |
| New user's email | String | No | |
| locale | New user's locale. Available locales are "pt-BR" and "en" | String | No |
{
"system_message": {
"type": "notice",
"content": "user was successfully updated"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "user was not updated"
},
"errors": [
...
]
}
Available errors are:
Updates current user's password.
PUT /myself/password
Payload:
curl -X PUT -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
-d '{ \
"new_password":"Secret.789", \
"password_confirmation":"Secret.789" \
}' \
http://localhost:8081/myself/password
Parameters:
| Name | Description | Type | Required |
|---|---|---|---|
| new_password | New password | String | Yes |
| password_confirmation | Password confirmation | String | Yes |
{
"system_message": {
"type": "notice",
"content": "password was successfully changed"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "password could not be changed"
},
"errors": [
...
]
}
Available errors are:
Destroys current user.
DELETE /myself
Payload:
curl -X DELETE -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081/myself
On success:
{
"system_message": {
"type": "notice",
"content": "user was successfully destroyed"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "user could not be destroyed"
}
}
Users are services whose admin users can manage all users.
Creates new users.
POST /users
Payload:
curl -X POST -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
-d '{ \
"name": "New User Name", \
<EMAIL_ADDRESS>\
"password":"Secret.001", \
"admin":"false", \
"locale":"en" \
}' \
http://localhost:8081/users
Parameters:
| Name | Description | Type | Mandatory |
|---|---|---|---|
| name | User's name | String | Yes |
| User's email | String | Yes | |
| password | User's password | String | Yes |
| admin | "true" for admin users and "false" for non admin users. Default is "false". | Boolean | No |
| locale | User's locale. Available locales are "en" or "pt-BR" | String | Yes |
{
"system_message": {
"type": "notice",
"content": "user was successfully created"
},
"user": {
"id": "user's id",
"name": "New User Name",
"email"<EMAIL_ADDRESS>"admin": false,
"locale": "en",
"created_at": "2019-08-26T23:30:26.820820046Z",
"updated_at": "2019-08-26T23:30:26.820820046Z"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "user was not created"
},
"errors": [
...
]
}
Available errors are:
Lists registered users.
GET /users
Payload:
curl -X GET -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081/users
Paramenters:
| Name | Description | Type | Required |
|---|---|---|---|
| page | Page number. Default is 1 | Integer | No |
| per_page | Entries per page. Default is 20 | Integer | No |
| order | List ordering | String | No |
| search[...] | Example: use search[name_cont]=a to search users whose contain "a" in their name. More than one parameter search is allowed. To learn more about it, check the search engine section. | String | No |
{
"pagination": {
"current_page": 1,
"total_pages": 1,
"total_entries": 1
},
"users": [
... array of users ...
]
}
Shows one single user, per once, identified by an id.
GET /users/{id}
Payload:
curl -X GET -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081/users/1
On success:
{
"id": "user's ID",
"name": "user's name",
"email": "user's email",
"password": "user's password",
"admin": true or false,
"locale": "user's locale",
"created_at": "2019-08-26T23:30:26.820820046Z",
"updated_at": "2019-08-26T23:30:26.820820046Z"
}
On error:
{
"system_message": {
"type": "alert",
"content": "user was not found"
}
}
Updates one single user, per once, identified by an id.
PUT /users/{id}
Payload:
curl -X PUT -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
-d '{ \
"name": "User Name", \
"email"<EMAIL_ADDRESS>\
"admin": "false", \
"locale": "en" \
}' \
http://localhost:8081/users/1
Parameters:
| Name | Description | Type | Mandatory |
|---|---|---|---|
| name | User's name | String | Yes |
| User's email | String | Yes | |
| admin | "true" for admin users and "false" for non admin users. Default is "false". | Boolean | No |
| locale | User's locale. Available locales are "en" or "pt-BR" | String | Yes |
{
"system_message": {
"type": "notice",
"content": "user was successfully updated"
},
"user": {
"id": "user's ID",
"name": "user's name",
"email": "user's email",
"admin": true or false,
"locale": "user's locale",
"created_at": "2019-08-26T23:30:26.820820046Z",
"updated_at": "2019-08-26T23:30:26.820820046Z"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "user was not updated"
},
"errors": [
...
]
}
Available errors are:
Updates one single user's password, per once, identified by an id.
PUT /users/{id}/password
Payload:
curl -X PUT -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
-d '{ \
"password": "User Name" \
}' \
http://localhost:8081/users/1/password
Parameters:
| Name | Description | Type | Mandatory |
|---|---|---|---|
| password | User's password | String | Yes |
{
"system_message": {
"type": "notice",
"content": "user password was successfully updated"
},
"user": {
"id": "user's ID",
"name": "user's name",
"email": "user's email",
"admin": true or false,
"locale": "user's locale",
"created_at": "2019-08-26T23:30:26.820820046Z",
"updated_at": "2019-08-26T23:30:26.820820046Z"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "user password was not updated"
},
"errors": [
...
]
}
Available errors are:
Detroys one single user, per once, identified by an id.
DELETE /users/{id}
Payload:
curl -X DELETE -H 'Content-Type: application/json' \
-H 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...' \
http://localhost:8081//users/1
On success:
{
"system_message": {
"type": "notice",
"content": "user was successfully destroyed"
}
}
On error:
{
"system_message": {
"type": "alert",
"content": "user was not found"
}
}


The prototype is a chair, embedded with sensors, that alert you when you stay in a wrong position or stay too long in the same position. Coupled with an Android application to show tips and notifications, the device can be used anywhere, at any time.
Are you aware of your posture? More and more people perform their work sitting down. But the human body is not designed to sit for prolonged periods. Let alone sitting ‘incorrectly’ for long periods.But sadly most people pay far too little attention to this. They often fail to realize sufficiently that health and a proper seated posture are intimately linked. Awareness is frequently gained only after physical problems arise.
MYCS monitors the user's seated posture and provides feedback where necessary. Sensors in the seat and back register and record the user's posture. The chair makes the user aware of their posture. This feedback contributes to increasing users' awareness of their seated posture. Ultimately, this means that users go home fitter.
Our clients are the people who spend a lot of time standing on a chair, at the office, being predisposed to back problems.
At the moment there are no other similar products on the market, the current level being reached by the seats with the highest degree of comfort.
MYCS not only offers high comfort, it provides real-time notifications to help users correct their posture. It also records reports over a fixed amount of time, allowing users to analyze their posture and receive recommendations.
To measure how effectively we are achieving our key business objectives we establish the following key performance indicators (KPI): posture awareness, number of demo calls, product performance, monthly sales growth, sales opportunities.
Major fixed costs include advertising & promotion, software, rent, supplies, materials, transporation, repairs & maintenance, insurance.
In order to plan strategy and communicate the revenue streams of our business we thought at the following revenue structure: consumer services, business services, smart insight software, smart cloud, products, advertising.
With a schedule that forces many people to stay in the same position for hours at a time, back pain has become a common thing nowadays and a serious threat for our health. We noticed the problem by experiencing it. When you are at work, you try to stay in a correct position on the chair, but as you do your tasks you may find out that your position has changed, and very likely not in a good way.
What if the chair could say to you 'Hey, you are not sitting right. Time for a break!'. By alerting you when necessary, you can focus on what you are doing and stop worrying about your postion. You will chair-ish those moments.
Our clients are the people who spend a lot of time standing on a chair, at the office, being predisposed to back problems. So we started by asking directly for the opinion of our colleges at work and college, as they are part of our target. We also asked them to help us distribute an online form , by sending it to all of their contacts.
The plan is to target the well known categories that are affected by the problem we are trying to solve and to see if our ideas converge with the potential customers ideas.
The customer discovery process was split in two halves. In the first one we tried to identify more accurately the target categories. We did this by sending online questionnaires to large groups of people belonging to a wide range of occupations. After gathering all the information from the questionnaires we identified the interest groups.
86% of the corporate industry(IT, sales, customer support) respondents, complained about neck and back problems caused by their consistently unhealthy posture at the office or are aware of the dangers of this issue.
Other groups, people that don't use to stay at the office for so long, did not have such conclusive opinions about the regarding problem.
The second phase was going in a more direct conversation with the target group discovered before. After the face-to-face discussions we concluded the followings:
The most significant aspect that changed after reaching with the customers was the orientation of the bussiness. A bussiness-to-bussiness strategy looks like the best approach due to responses that we got.
As Vlad, I want to receive notifications in real-time about my sitting habits, so that I can monitor and correct my posture.
As Vlad, I want to get detailed data on my posture gathered over a set period of time so I can understand how to have a better posture.
At this time, the competition is mostly made from new-born projects. Projects that are in their earliest stage and that even though present the same ideea, are different in many aspects. Surpassing the competitons will need strategic analysis on the target market, on how and when to lauch ad campains, how to manage the development phase and how to balance the finances. The risk of not surpassing the competition must be considered, and even in a scenario when MYCS is not leading the market for the first 3 years, giving the potentially small number of players, the market share looks promising enough.
Architecture
Due to complex requirements of the software, we decided to use UDOO Neo board, running a simplified Linux distribution.
Initial value
After we managed to get some more validation and we decided that we found a real problem and the fact that people would like to use our product, we set the first phase targets as:
Workflow
The user just have to place the monitoring device on their chair, as we promised in the early stages.
After the device is on, user can receive live statistics for his position in the chair and can get reports of which zones he is pressuring the most. Some advices to repair his position are provided as we noticed from previous validation. The video below is a demo of UX and UI.
Being an MVP the project is in the alpha phase yet, not so good looking but we managed to get some early adapters using it for a while and even got some donations and feedback for future development.
We have implemented the core features and in the future we plan to redesign the UI and the UX, making our application more friendly and available on iOS and Android.
On the landing page and on the Fiki page we also have the feedback from continuous feedback loop so that the users could send us their dissatisfaction if any, or possible upgrades and features that they may want to try. We receive feedback on e-mail and on the Hotjar monitorization tool.
User sending feedback.
Feedback is received via email or facebook.
We started presenting our product within the university and various companies, especially IT, to which we had access through friends and acquaintances.  In addition, they are passionate about technology and anything that could make life easier. This approach was a good one because we received a lot of feedback, ways by which we can improve our product and also 70% of the participants were interested in getting a demo for a set amount of time, while another 8% were willing to buy directly. So, we offered each of the interested companies with a free demo product for a month so employees can test it during break times. We also followed the relevant events taking place around us and we tried to expose our product at the ones that seemed most promising, alternatively going to bigger events as attendees.
We also contacted niche blogs, which are addressing lifestyle practices and technology trends, and tried to get them review our product. To make it easy for them, we offered to walk them through the product, showing the functionality and the possible use cases. For some of them we had to make the offer more enticing by giving the opportunity to give something away to their audience, so we offered a free demo product to the first ten potential clients. We’ve been able to convince a few local bloggers and we recorded a number of requests from people willing to try our product.
We offered our potential customers the opportunity to enroll to MYCS shortlist, preorder the product or make a donation. See our advertising below.
If you like our idea, enroll to MYCS shortlist or preorder the product. You have 2 bundle options. The €30 standard package which will include the baseline model and the €45 one which also includes three different color cases and MYCS stickers.
You can also make a donation to support MYCS and show your appreciation
We also asked people who tried our product to complete the form below to analyze their overall experience and to see what improvements we could make.


2.1.2. Sensitivity analysis¶
Global sensitivity analysis is used to quantify the contribution of each input variable to the uncertainty in QoI. Using the global sensitivity indices, users can set preferences between random variables considering both inherent randomness and its propagation through the model. Global sensitivity analysis helps users understand the overall impact of different sources of uncertainties and their interactions and accelerate UQ computations by focusing on dominant dimensions or screening out trivial input variables. Sensitivity index can also be used to identify the input variables for which additional experimentation/research may reduce the uncertainty in the initial specification.
Sobol indices are widely used variance-based global sensitivity measures with two types: main effect and total effect sensitivity indices. The main effect index quantifies the fraction of variance in QoI attributed to specific input random variable(s) but without considering the interactive effect with other input variables. The total effect index, on the other hand, additionally takes the interactions into account.
Given an output of a model \(y=g(\boldsymbol{x})\) and input random variables \(\boldsymbol{x}=\{x_1,x_2, \cdots ,x_d\}\), the first-order main and total effect indices of each input variable are defined as
respectively, where \(\boldsymbol{x}_{\sim i}\) indicates the set of all input variables except \(x_i\). Currently, this engine supports first-order main and total effect indices.
Dakota Sensitivity Analysis is based on the efficient Monte Carlo method (see the paper of [Weirs12] referred in Dakota Technical manual [Adams20]). The user has two options to generate the samples on which the statistics are created: Monte Carlo and Latin Hypercube Sampling (LHS). For both, they are required, as shown in the figure below, to specify the number of samples and a seed.
The sensitivity analysis results will show both the main effect and total effect Sobol indices for each RV for each of the QoI.
Note
When the associated FEM model is computationally expensive, the user should consider that the actual number of the simulation runs is larger than the number of samples specified in the input panel. The exact number of simulation runs are NS*(2+NRV)
NS = number of samples specified by user
NRV = number of random variables
- Weirs12
Weirs, J. R. Kamm, L. P. Swiler, M. Ratto, S. Tarantola, B. M. Adams, W. J. Rider, and M. S Eldred. Sensitivity analysis techniques applied to a system of hyperbolic conservation laws. Reliability Engineering and System Safety, 107:157–170, 2012
- Adams20
Adams et al., DAKOTA, a multilevel parallel object-oriented framework for design optimization, parameter estimation, uncertainty quantification, and sensitivity analysis: version 6.12 user’s manual. Sandia National Laboratories, Tech. Rep. SAND2020-5001 (2020).


PickerField
This is your UIPickerView which only supports 1 column. Most of the setup work has been extracted away, leaving little implementation logic needed. All you need to do is set its data
array to your string array and the rest is handled for you.
The PickerField holds an EntryField that is used to display the contents of the picker.
This will be a little different than you’re used to as you no longer need to implement the data source protocol.
You have:
shouldBeginEditing : wether it should open or not
didEndEditing: user closed the field by tapping on the done button or keyboard came up (see Keyboard Behaviour)
cleared : user tapped the clear button (only if
isClearable = true
)selectedRowForIndexPath : user selected a different value in the picker
Extra Features
isManualEntryCapable
this appends aManual Entry
option to the end of your data source which brings up the keyboard if selected and activates the EntryField embedded inside the PickerField. The manual entry row label is overridable usingmanualEntryOptionName
.
You can observe the current index using indexSelected
set an index using setIndexTo
and set the index to manual entry using setIndexToManual()
.
Responder Behaviour
becomeFirstResponder()
will activate and open up the picker / EntryField if it’s on manual entryresignFirstResponder()
will deactivate and close the picker / EntryField if it’s on manual entry
Keyboard Behaviour
PickerFields register for keyboardDidShow notifications. If they are not on manual entry, they will close themselves and trigger their didEndEditing delegate upon the keyboard coming up.


DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON https://guides.rubyonrails.org.
Action Cable Overview
In this guide, you will learn how Action Cable works and how to use WebSockets to
incorporate real-time features into your Rails
application.
After reading this guide, you will know:
- What Action Cable is and its integration backend and frontend
- How to set up Action Cable
- How to set up channels
- Deployment and Architecture setup for running Action Cable
What is Action Cable?
Action Cable seamlessly integrates
WebSockets with the rest of your
Rails
application. It allows for real-time features to be written in Ruby in the
same style and form as the rest of your Rails
application, while still being
performant and scalable. It's a full-stack offering that provides both a
client-side JavaScript framework and a server-side Ruby framework. You have
access to your entire domain model written with Active Record or your ORM of
choice.
Terminology
Action Cable uses WebSockets instead of the HTTP request-response protocol. Both Action Cable and WebSockets introduce some less familiar terminology:
Connections
Connections form the foundation of the client-server relationship. A single Action Cable server can handle multiple connection instances. It has one connection instance per WebSocket connection. A single user may have multiple WebSockets open to your application if they use multiple browser tabs or devices.
Consumers
The client of a WebSocket connection is called the consumer. In Action Cable, the consumer is created by the client-side JavaScript framework.
Channels
Each consumer can, in turn, subscribe to multiple channels. Each channel
encapsulates a logical unit of work, similar to what a controller does in
a typical MVC setup. For example, you could have a ChatChannel
and
an AppearancesChannel
, and a consumer could be subscribed to either
or both of these channels. At the very least, a consumer should be subscribed
to one channel.
Subscribers
When the consumer is subscribed to a channel, they act as a subscriber. The connection between the subscriber and the channel is, surprise-surprise, called a subscription. A consumer can act as a subscriber to a given channel any number of times. For example, a consumer could subscribe to multiple chat rooms at the same time. (And remember that a physical user may have multiple consumers, one per tab/device open to your connection).
Pub/Sub
Pub/Sub or Publish-Subscribe refers to a message queue paradigm whereby senders of information (publishers), send data to an abstract class of recipients (subscribers), without specifying individual recipients. Action Cable uses this approach to communicate between the server and many clients.
Broadcastings
A broadcasting is a pub/sub link where anything transmitted by the broadcaster is sent directly to the channel subscribers who are streaming that named broadcasting. Each channel can be streaming zero or more broadcastings.
Server-Side Components
Connections
For every WebSocket accepted by the server, a connection object is instantiated. This object becomes the parent of all the channel subscriptions that are created from thereon. The connection itself does not deal with any specific application logic beyond authentication and authorization. The client of a WebSocket connection is called the connection consumer. An individual user will create one consumer-connection pair per browser tab, window, or device they have open.
Connections are instances of ApplicationCable::Connection
, which extends
::ActionCable::Connection::Base
. In ApplicationCable::Connection
, you
authorize the incoming connection and proceed to establish it if the user can
be identified.
Connection Setup
# app/channels/application_cable/connection.rb
module ApplicationCable
class Connection < ActionCable::Connection::Base
identified_by :current_user
def connect
self.current_user = find_verified_user
end
private
def find_verified_user
if verified_user = User.find_by(id: .encrypted[:user_id])
verified_user
else
end
end
end
end
Here identified_by
designates a connection identifier that can be used to find the
specific connection later. Note that anything marked as an identifier will automatically
create a delegate by the same name on any channel instances created off the connection.
This example relies on the fact that you will already have handled authentication of the user somewhere else in your application, and that a successful authentication sets an encrypted cookie with the user ID.
The cookie is then automatically sent to the connection instance when a new connection
is attempted, and you use that to set the current_user
. By identifying the connection
by this same current user, you're also ensuring that you can later retrieve all open
connections by a given user (and potentially disconnect them all if the user is deleted
or unauthorized).
If your authentication approach includes using a session, you use cookie store for the
session, your session cookie is named _session
and the user ID key is user_id
you
can use this approach:
verified_user = User.find_by(id: .encrypted['_session']['user_id'])
Exception Handling
By default, unhandled exceptions are caught and logged to Rails' logger. If you would like to
globally intercept these exceptions and report them to an external bug tracking service, for
example, you can do so with rescue_from
:
# app/channels/application_cable/connection.rb
module ApplicationCable
class Connection < ActionCable::Connection::Base
rescue_from StandardError, with: :report_error
private
def report_error(e)
SomeExternalBugtrackingService.notify(e)
end
end
end
Connection Callbacks
There are before_command
, after_command
, and around_command
callbacks available to be invoked before, after or around every command received by a client respectively.
The term "command" here refers to any interaction received by a client (subscribing, unsubscribing or performing actions):
# app/channels/application_cable/connection.rb
module ApplicationCable
class Connection < ActionCable::Connection::Base
identified_by :user
around_command :set_current_account
private
def set_current_account(&block)
# Now all channels could use Current.account
Current.set(account: user.account, &block)
end
end
end
Channels
A channel encapsulates a logical unit of work, similar to what a controller does in a
typical MVC setup. By default, Rails creates a parent ApplicationCable::Channel
class
(which extends ::ActionCable::Channel::Base
) for encapsulating shared logic between your channels.
Parent Channel Setup
# app/channels/application_cable/channel.rb
module ApplicationCable
class Channel < ActionCable::Channel::Base
end
end
Then you would create your own channel classes. For example, you could have a
ChatChannel
and an AppearanceChannel
:
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
end
# app/channels/appearance_channel.rb
class AppearanceChannel < ApplicationCable::Channel
end
A consumer could then be subscribed to either or both of these channels.
Subscriptions
Consumers subscribe to channels, acting as subscribers. Their connection is called a subscription. Produced messages are then routed to these channel subscriptions based on an identifier sent by the channel consumer.
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
# Called when the consumer has successfully
# become a subscriber to this channel.
def subscribed
end
end
Exception Handling
As with ApplicationCable::Connection
, you can also use rescue_from
on a
specific channel to handle raised exceptions:
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
rescue_from 'MyError', with: :deliver_error_message
private
def deliver_error_message(e)
broadcast_to(...)
end
end
Channel Callbacks
ApplicationCable::Channel
provides a number of callbacks that can be used to trigger logic
during the life cycle of a channel. Available callbacks are:
before_subscribe
after_subscribe
(also aliased as:on_subscribe
)before_unsubscribe
after_unsubscribe
(also aliased as:on_unsubscribe
)
NOTE: The after_subscribe
callback is triggered whenever the subscribed
method is called,
even if subscription was rejected with the reject
method. To trigger after_subscribe
only on successful subscriptions, use after_subscribe :send_welcome_message, unless: :subscription_rejected?
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
after_subscribe :send_welcome_message, unless: :subscription_rejected?
after_subscribe :track_subscription
private
def send_welcome_message
broadcast_to(...)
end
def track_subscription
# ...
end
end
Client-Side Components
Connections
Consumers require an instance of the connection on their side. This can be established using the following JavaScript, which is generated by default by Rails:
Connect Consumer
// app/javascript/channels/consumer.js
// Action Cable provides the framework to deal with WebSockets in Rails.
// You can generate new channels where WebSocket features live using the `bin/rails generate channel` command.
import { createConsumer } from "@rails/actioncable"
export default createConsumer()
This will ready a consumer that'll connect against /cable
on your server by default.
The connection won't be established until you've also specified at least one subscription
you're interested in having.
The consumer can optionally take an argument that specifies the URL to connect to. This can be a string or a function that returns a string that will be called when the WebSocket is opened.
// Specify a different URL to connect to
createConsumer('wss://example.com/cable')
// Or when using websockets over HTTP
createConsumer('https://ws.example.com/cable')
// Use a function to dynamically generate the URL
createConsumer(getWebSocketURL)
function getWebSocketURL() {
const token = localStorage.get('auth-token')
return `wss://example.com/cable?token=${token}`
}
Subscriber
A consumer becomes a subscriber by creating a subscription to a given channel:
// app/javascript/channels/chat_channel.js
import consumer from "./consumer"
consumer.subscriptions.create({ channel: "ChatChannel", room: "Best Room" })
// app/javascript/channels/appearance_channel.js
import consumer from "./consumer"
consumer.subscriptions.create({ channel: "AppearanceChannel" })
While this creates the subscription, the functionality needed to respond to received data will be described later on.
A consumer can act as a subscriber to a given channel any number of times. For example, a consumer could subscribe to multiple chat rooms at the same time:
// app/javascript/channels/chat_channel.js
import consumer from "./consumer"
consumer.subscriptions.create({ channel: "ChatChannel", room: "1st Room" })
consumer.subscriptions.create({ channel: "ChatChannel", room: "2nd Room" })
Client-Server Interactions
Streams
Streams provide the mechanism by which channels route published content
(broadcasts) to their subscribers. For example, the following code uses
stream_from
to subscribe to the broadcasting named chat_Best Room
when
the value of the :room
parameter is "Best Room"
:
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
def subscribed
stream_from "chat_#{params[:room]}"
end
end
Then, elsewhere in your Rails application, you can broadcast to such a room by
calling broadcast
:
ActionCable.server.broadcast("chat_Best Room", { body: "This Room is Best Room." })
If you have a stream that is related to a model, then the broadcasting name
can be generated from the channel and model. For example, the following code
uses stream_for
to subscribe to a broadcasting like
posts:Z2lkOi8vVGVzdEFwcC9Qb3N0LzE
, where Z2lkOi8vVGVzdEFwcC9Qb3N0LzE
is
the GlobalID of the Post model.
class PostsChannel < ApplicationCable::Channel
def subscribed
post = Post.find(params[:id])
stream_for post
end
end
You can then broadcast to this channel by calling broadcast_to
:
PostsChannel.broadcast_to(@post, @comment)
Broadcastings
A broadcasting is a pub/sub link where anything transmitted by a publisher is routed directly to the channel subscribers who are streaming that named broadcasting. Each channel can be streaming zero or more broadcastings.
Broadcastings are purely an online queue and time-dependent. If a consumer is not streaming (subscribed to a given channel), they'll not get the broadcast should they connect later.
Subscriptions
When a consumer is subscribed to a channel, they act as a subscriber. This connection is called a subscription. Incoming messages are then routed to these channel subscriptions based on an identifier sent by the cable consumer.
// app/javascript/channels/chat_channel.js
import consumer from "./consumer"
consumer.subscriptions.create({ channel: "ChatChannel", room: "Best Room" }, {
received(data) {
this.appendLine(data)
},
appendLine(data) {
const html = this.createLine(data)
const element = document.querySelector("[data-chat-room='Best Room']")
element.insertAdjacentHTML("beforeend", html)
},
createLine(data) {
return `

${data["sent_by"]}
${data["body"]}

`
}
})
Passing Parameters to Channels
You can pass parameters from the client-side to the server-side when creating a subscription. For example:
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
def subscribed
stream_from "chat_#{params[:room]}"
end
end
An object passed as the first argument to subscriptions.create
becomes the
params hash in the cable channel. The keyword channel
is required:
// app/javascript/channels/chat_channel.js
import consumer from "./consumer"
consumer.subscriptions.create({ channel: "ChatChannel", room: "Best Room" }, {
received(data) {
this.appendLine(data)
},
appendLine(data) {
const html = this.createLine(data)
const element = document.querySelector("[data-chat-room='Best Room']")
element.insertAdjacentHTML("beforeend", html)
},
createLine(data) {
return `

${data["sent_by"]}
${data["body"]}

`
}
})
# Somewhere in your app this is called, perhaps
# from a NewCommentJob.
ActionCable.server.broadcast(
"chat_#{room}",
{
sent_by: 'Paul',
body: 'This is a cool chat app.'
}
)
Rebroadcasting a Message
A common use case is to rebroadcast a message sent by one client to any other connected clients.
# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
def subscribed
stream_from "chat_#{params[:room]}"
end
def receive(data)
ActionCable.server.broadcast("chat_#{params[:room]}", data)
end
end
// app/javascript/channels/chat_channel.js
import consumer from "./consumer"
const chatChannel = consumer.subscriptions.create({ channel: "ChatChannel", room: "Best Room" }, {
received(data) {
// data => { sent_by: "Paul", body: "This is a cool chat app." }
}
})
chatChannel.send({ sent_by: "Paul", body: "This is a cool chat app." })
The rebroadcast will be received by all connected clients, including the client that sent the message. Note that params are the same as they were when you subscribed to the channel.
Full-Stack Examples
The following setup steps are common to both examples:
Example 1: User Appearances
Here's a simple example of a channel that tracks whether a user is online or not and what page they're on. (This is useful for creating presence features like showing a green dot next to a username if they're online).
Create the server-side appearance channel:
# app/channels/appearance_channel.rb
class AppearanceChannel < ApplicationCable::Channel
def subscribed
current_user.appear
end
def unsubscribed
current_user.disappear
end
def appear(data)
current_user.appear(on: data['appearing_on'])
end
def away
current_user.away
end
end
When a subscription is initiated the subscribed
callback gets fired, and we
take that opportunity to say "the current user has indeed appeared". That
appear/disappear API could be backed by Redis, a database, or whatever else.
Create the client-side appearance channel subscription:
// app/javascript/channels/appearance_channel.js
import consumer from "./consumer"
consumer.subscriptions.create("AppearanceChannel", {
// Called once when the subscription is created.
initialized() {
this.update = this.update.bind(this)
},
// Called when the subscription is ready for use on the server.
connected() {
this.install()
this.update()
},
// Called when the WebSocket connection is closed.
disconnected() {
this.uninstall()
},
// Called when the subscription is rejected by the server.
rejected() {
this.uninstall()
},
update() {
this.documentIsActive ? this.appear() : this.away()
},
appear() {
// Calls {AppearanceChannel#appear(data)} on the server.
this.perform("appear", { appearing_on: this.appearingOn })
},
away() {
// Calls {AppearanceChannel#away} on the server.
this.perform("away")
},
install() {
window.addEventListener("focus", this.update)
window.addEventListener("blur", this.update)
document.addEventListener("turbo:load", this.update)
document.addEventListener("visibilitychange", this.update)
},
uninstall() {
window.removeEventListener("focus", this.update)
window.removeEventListener("blur", this.update)
document.removeEventListener("turbo:load", this.update)
document.removeEventListener("visibilitychange", this.update)
},
get documentIsActive() {
return document.visibilityState === "visible" && document.hasFocus()
},
get appearingOn() {
const element = document.querySelector("[data-appearing-on]")
return element ? element.getAttribute("data-appearing-on") : null
}
})
Client-Server Interaction
Client connects to the Server via
createConsumer()
. (consumer.js
). The Server identifies this connection bycurrent_user
.Client subscribes to the appearance channel via
consumer.subscriptions.create({ channel: "AppearanceChannel" })
. (appearance_channel.js
)Server recognizes a new subscription has been initiated for the appearance channel and runs its
subscribed
callback, calling theappear
method oncurrent_user
. (appearance_channel.rb
)Client recognizes that a subscription has been established and calls
connected
(appearance_channel.js
), which in turn callsinstall
andappear
.appear
callsAppearanceChannel#appear(data)
on the server, and supplies a data hash of{ appearing_on: this.appearingOn }
. This is possible because the server-side channel instance automatically exposes all public methods declared on the class (minus the callbacks), so that these can be reached as remote procedure calls via a subscription'sperform
method.Server receives the request for the
appear
action on the appearance channel for the connection identified bycurrent_user
(appearance_channel.rb
). Server retrieves the data with the:appearing_on
key from the data hash and sets it as the value for the:on
key being passed tocurrent_user.appear
.
Example 2: Receiving New Web Notifications
The appearance example was all about exposing server functionality to client-side invocation over the WebSocket connection. But the great thing about WebSockets is that it's a two-way street. So, now, let's show an example where the server invokes an action on the client.
This is a web notification channel that allows you to trigger client-side web notifications when you broadcast to the relevant streams:
Create the server-side web notifications channel:
# app/channels/web_notifications_channel.rb
class WebNotificationsChannel < ApplicationCable::Channel
def subscribed
stream_for current_user
end
end
Create the client-side web notifications channel subscription:
// app/javascript/channels/web_notifications_channel.js
// Client-side which assumes you've already requested
// the right to send web notifications.
import consumer from "./consumer"
consumer.subscriptions.create("WebNotificationsChannel", {
received(data) {
new Notification(data["title"], { body: data["body"] })
}
})
Broadcast content to a web notification channel instance from elsewhere in your application:
# Somewhere in your app this is called, perhaps from a NewCommentJob
WebNotificationsChannel.broadcast_to(
current_user,
title: 'New things!',
body: 'All the news fit to print'
)
The WebNotificationsChannel.broadcast_to
call places a message in the current
subscription adapter's pubsub queue under a separate broadcasting name for each
user. For a user with an ID of 1, the broadcasting name would be
web_notifications:1
.
The channel has been instructed to stream everything that arrives at
web_notifications:1
directly to the client by invoking the received
callback. The data passed as an argument is the hash sent as the second parameter
to the server-side broadcast call, JSON encoded for the trip across the wire
and unpacked for the data argument arriving as received
.
More Complete Examples
See the rails/actioncable-examples repository for a full example of how to set up Action Cable in a Rails app and adding channels.
Configuration
Action Cable has two required configurations: a subscription adapter and allowed request origins.
Subscription Adapter
By default, Action Cable looks for a configuration file in config/cable.yml
.
The file must specify an adapter for each Rails environment. See the
Dependencies section for additional information on adapters.
development:
adapter: async
test:
adapter: test
production:
adapter: redis
url: redis://<IP_ADDRESS>:6381
channel_prefix: appname_production
Adapter Configuration
Below is a list of the subscription adapters available for end-users.
Async Adapter
The async adapter is intended for development/testing and should not be used in production.
Redis Adapter
The Redis adapter requires users to provide a URL pointing to the Redis server.
Additionally, a channel_prefix
may be provided to avoid channel name collisions
when using the same Redis server for multiple applications. See the Redis Pub/Sub documentation for more details.
The Redis adapter also supports SSL/TLS connections. The required SSL/TLS parameters can be passed in ssl_params
key in the configuration YAML file.
production:
adapter: redis
url: rediss://<IP_ADDRESS>:tls_port
channel_prefix: appname_production
ssl_params: {
ca_file: "/path/to/ca.crt"
}
The options given to ssl_params
are passed directly to the OpenSSL::SSL::SSLContext#set_params
method and can be any valid attribute of the SSL context.
Please refer to the OpenSSL::SSL::SSLContext documentation for other available attributes.
If you are using self-signed certificates for redis adapter behind a firewall and opt to skip certificate check, then the ssl verify_mode
should be set as OpenSSL::SSL::VERIFY_NONE
.
WARNING: It is not recommended to use VERIFY_NONE
in production unless you absolutely understand the security implications. In order to set this option for the Redis adapter, the config should be ssl_params: { verify_mode: <%= OpenSSL::SSL::VERIFY_NONE %> }
.
PostgreSQL Adapter
The PostgreSQL adapter uses Active Record's connection pool, and thus the
application's config/database.yml
database configuration, for its connection.
This may change in the future. #27214
Allowed Request Origins
Action Cable will only accept requests from specified origins, which are passed to the server config as an array. The origins can be instances of strings or regular expressions, against which a check for the match will be performed.
config.action_cable.allowed_request_origins = ['https://rubyonrails.com', %r{http://ruby.*}]
To disable and allow requests from any origin:
config.action_cable.disable_request_forgery_protection = true
By default, Action Cable allows all requests from localhost:3000 when running in the development environment.
Consumer Configuration
To configure the URL, add a call to action_cable_meta_tag
in your HTML layout
HEAD. This uses a URL or path typically set via config.action_cable.url
in the
environment configuration files.
Worker Pool Configuration
The worker pool is used to run connection callbacks and channel actions in isolation from the server's main thread. Action Cable allows the application to configure the number of simultaneously processed threads in the worker pool.
config.action_cable.worker_pool_size = 4
Also, note that your server must provide at least the same number of database
connections as you have workers. The default worker pool size is set to 4, so
that means you have to make at least 4 database connections available.
You can change that in config/database.yml
through the pool
attribute.
Client-side Logging
Client-side logging is disabled by default. You can enable this by setting the ActionCable.logger.enabled
to true.
import * as ActionCable from '@rails/actioncable'
ActionCable.logger.enabled = true
Other Configurations
The other common option to configure is the log tags applied to the per-connection logger. Here's an example that uses the user account id if available, else "no-account" while tagging:
config.action_cable. = [
#=> request { request.env['user_account_id'] || "no-account" },
:action_cable,
#=> request { request.uuid }
]
For a full list of all configuration options, see the
::ActionCable::Server::Configuration
class.
Running Standalone Cable Servers
Action Cable can either run as part of your Rails application, or as a standalone server. In development, running as part of your Rails app is generally fine, but in production you should run it as a standalone.
In App
Action Cable can run alongside your Rails application. For example, to
listen for WebSocket requests on /websocket
, specify that path to
config.action_cable.mount_path
:
# config/application.rb
class Application < Rails::Application
config.action_cable.mount_path = '/websocket'
end
You can use ActionCable.createConsumer()
to connect to the cable
server if action_cable_meta_tag
is invoked in the layout. Otherwise, a path is
specified as first argument to createConsumer
(e.g. ActionCable.createConsumer("/websocket")
).
For every instance of your server you create, and for every worker your server spawns, you will also have a new instance of Action Cable, but the Redis or PostgreSQL adapter keeps messages synced across connections.
Standalone
The cable servers can be separated from your normal application server. It's still a Rack application, but it is its own Rack application. The recommended basic setup is as follows:
# cable/config.ru
require_relative "../config/environment"
Rails.application.eager_load!
run ActionCable.server
Then to start the server:
bundle exec puma -p 28080 cable/config.ru
This starts a cable server on port 28080. To tell Rails to use this server, update your config:
# config/environments/development.rb
Rails.application.configure do
config.action_cable.mount_path = nil
config.action_cable.url = "ws://localhost:28080" # use wss:// in production
end
Finally, ensure you have configured the consumer correctly.
Notes
The WebSocket server doesn't have access to the session, but it has access to the cookies. This can be used when you need to handle authentication. You can see one way of doing that with Devise in this article.
Dependencies
Action Cable provides a subscription adapter interface to process its
pubsub internals. By default, asynchronous, inline, PostgreSQL, and Redis
adapters are included. The default adapter
in new Rails applications is the asynchronous (async
) adapter.
The Ruby side of things is built on top of websocket-driver, nio4r, and concurrent-ruby.
Deployment
Action Cable is powered by a combination of WebSockets and threads. Both the framework plumbing and user-specified channel work are handled internally by utilizing Ruby's native thread support. This means you can use all your existing Rails models with no problem, as long as you haven't committed any thread-safety sins.
The Action Cable server implements the Rack socket hijacking API, thereby allowing the use of a multi-threaded pattern for managing connections internally, irrespective of whether the application server is multi-threaded or not.
Accordingly, Action Cable works with popular servers like Unicorn, Puma, and Passenger.
Testing
You can find detailed instructions on how to test your Action Cable functionality in the testing guide.


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There are a number of famous coffee-growing regions in the world, each with its own unique subtle tastes. Two of the most well-known are the Jamaican Blue Mountain region, and the other is Kona area of Hawaii. Now, Kona isn't just any coffee grown in Hawaii, but specifically coffee from the slopes of Mauna Loa and Mount Hualalai on the Big Island. This west side of the island gets just the right combination of sunlight, warmth and rainfall to produce abundant coffee crops.
Kona is not only excellent coffee, it is fairly rare too. Only 2 million pounds of coffee are produced each year. It's hard to come by due to the particularly small region where it grows and the traditional farming practices. All of the coffee beans grown in Kona are raised on more than 600 family-owned farms, many smaller than 5 acres. The ripe coffee cherries are all hand-picked through the growing season. Hand-picking may limit the size of the crops, but does ensure you get the finest possible coffee beans.
The beans are wet-method processed, and usually left to dry naturally in the sun. Some Kona farmers sell their crops at either the fresh cherry stage, or as green beans. More farmers are maximizing their profits and even roasting their beans directly for sale under their own private labels. There are more than 100 such operations in Hawaii.
Kona wasn't always grown on family farms like you find today. Originally, there were huge coffee plantations, like you might find in Kenya.
But there was a crash in the world coffee market in 1899. Plantation owners leased out their land holdings to the workers. These small parcels of land became the family farms still in operation.
Types of Knoa Coffee
There are many grades of Kona coffee: Kona extra fancy, Kona fancy, Kona number 1, and Kona prime. Coffee normally has 2 beans per cherry. When there is only 1, it is called “peaberry” and there are 2 extra grades for Kona peaberry coffee: Peaberry number 1, and Peaberry prime. You will sometimes find Kona blends, but be aware that these often have only 10% true Kona beans, or even less. If you are looking for true Kona, watch for the seal from the Kona Coffee Council that marks a coffee product as 100% Kona.
The flavour of Kona coffee is very rich, with only a touch of acidity. Other coffees will seem flat and dull compared to the spicy mix of flavours in a cup of carefully brewed Kona.


CLEOPATRA'S SECOND HUSBAND --------------------------
When Robert (Paul Hipp, "Midnight in the Garden of Good and Evil") and his overbearing wife Hallie (Bitty Schram, "Kissing a Fool") plan a babymaking trip to the country, friends of friends Zack (Boyd Kestner, G.I. Jane") and Sophie (Radha Mitchell, "Pitch Black") move in to take care of their dog and exotic tropical fish.
LAURA:
Reiss claims to have based his tale on a true life housesitting incident combined with Marc Anthony's decline in the wake of his passion for Cleopatra. He makes no mention of the Dutch film (and its American remake) "The Vanishing," although clearly it inspired his third act.
After Zack and Sophie declare they're unable to find their own place in LA, Robert quickly becomes enthralled by sexy Sophie and Hallie departs after catching the two together. Zack seems perfectly willing to share Sophie, but when he forces himself on Robert, Sophie leaves in disgust. Zack continues to dominate Robert, even buying him an apron, while clouding his true intentions with a show of friendship and camaraderie. Eventually Robert wises up and plots an elaborate revenge.
While the script contains some good (albeit unoriginal) ideas, the story is so oddly executed that it frequently seems weird for weirdness' sake. Robert, a photographer existing on inheritted money, stops to photograph maggots on roadkill during his country idyll. 'Maggots and dead things - I like it.' says Sophie later as she watches him develop the picture. This is strange and offputting, but leads absolutely nowhere, nor does it provide any character illumination.
The only character who's the least bit likeable is the promiscuous Sophie, yet we wonder how she ended up with evil Zack and what their history was. Robert is a henpecked schlmemiel who's introduced hosting a dinner party of annoying yuppies impressed with pretense. Hallie is unbearable and joyless, demanding sex once a month only in order to get pregnant, because that's the way it's done. Zack is a slovenly satyr and a leech. The cast can't be faulted as they all do a good job playing their characters.
"Cleopatra's Second Husband" would make an OK diversion for late night cable, but as a theatrical feature it's appeal will be extremely limitted. The film completely loses its stream in its final act which is unsatisfying and unappealing.
C-
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