class: center, middle # From Dockerfiles to Ansible Container ## Tomas Tomecek --- # /whois ## Tomáš Tomeček -- * hacker, developer, tinker, speaker, teacher * contributing to * * ~~ops~~ engineer ??? * Ask who is dev and ops; initiate applause for ops. -- * Red Hat * containerization team & modularity team --- # Agenda 1. Dockerfile/docker-compose project. 2. Transition. 3. Ansible Container project. 4. Container-enabled Ansible roles. 5. Bright future. --- # Requirements ## For development setup and deployment * Easy to set up. * With a single command. -- * Consistent environment for every developer. * Containers * The deployment * Tests ??? * Everyone is running the same version of webserver, database, compiler. * We also want to run run tests in a container. --- # Requirements ## For development setup and deployment (cont.) * Development and production environment. * Developers want to iterate quickly. * Production environment needs to be rock-solid. -- * BTW, we also need staging environment. ??? * Are these requirements sane? --- # Dockerfile/docker-compose project ## Description * Dockerfile (= custom image) for your application. -- * Service images from Docker Hub. -- * Deployment done with Compose file. * Handcrafted --- # Dockerfile/docker-compose project ## Examples * Building the project: ```bash $ docker-compose build ``` * Running the project: ```bash $ docker-compose up ``` --- # Dockerfile/docker-compose project ## Sample Dockerfile ```dockerfile FROM fedora:25 RUN dnf install -y git python-pip gcc python-devel \ postgresql-devel redhat-rpm-config python2-pytest npm && \ npm install -g bower ARG USER_ID=1000 RUN useradd -o -u ${USER_ID} django && \ mkdir -p /opt/app && \ chown django:django /opt/app USER django ``` --- # Dockerfile/docker-compose project ## Sample Dockerfile (cont.) ```dockerfile WORKDIR /opt/app COPY ./requirements.txt /opt/app/ RUN pip install --user -r ./requirements.txt COPY ./requirements-devel.txt /opt/app/ RUN pip install --user -r ./requirements-devel.txt COPY ./install_static_data.sh /opt/app COPY ./bower.json /opt/app RUN ./install_static_data.sh ``` --- # Dockerfile/docker-compose project ## Sample Dockerfile (cont.) ```dockerfile COPY . /opt/app/ USER root RUN chown -R django:django . USER django # database needs to be set up before web can start serving requests CMD sleep 7 && exec python /opt/app/manage.py runserver -v3 <IP_ADDRESS>:8000 ``` --- # Sample Compose file ```yaml web: build: dockerfile: Dockerfile context: . ports: - "8000:8000" links: - db tty: true environment: - POSTGRESQL_DATABASE=django - POSTGRESQL_USER=user - POSTGRESQL_PASSWORD=password - API_KEY ``` --- # Sample Compose file (cont.) ```yaml db: image: registry.access.redhat.com/rhscl/postgresql-95-rhel7 volumes: - ./db:/var/lib/pgsql/data environment: - POSTGRESQL_DATABASE=django - POSTGRESQL_USER=user - POSTGRESQL_PASSWORD=password ``` --- # Dockerfile/docker-compose project ## Pros * Wide usage. * Satisfies (some) requirements. * Docker Hub contains tons of images. * Actively developed. ??? * These pros and cons might be subjective. --- # Dockerfile/docker-compose project ## Cons * Compose file is not powerful: * Can't run commands easily in containers (e.g. database migration). * Can't have dev/prod specific deployments within a single definition file. * Service readiness checks are clunky. * No variables. -- * Dockerfile and Compose file are specific to Docker ecosystem. ??? * Start database migration after the database is up and accepting connections. * `sleep` or poll * can't provision vm, or a rkt container -- locked in to docker platform * dockerfiles are full of hacks and are not trivial to master --- # Dockerfile/docker-compose project ## Cons (cont.) * Some Docker Hub images are outdated and lack documentation. * Official vs. community. -- * Shell scripts, blah. ??? * Content: is it secure? What's inside? --- # Shell script example -- ```bash RUN set -eux; \ \ # this "case" statement is generated via "update.sh" %%ARCH-CASE%%; \ \ url="https://golang.org/dl/go${GOLANG_VERSION}.${goRelArch}.tar.gz"; \ wget -O go.tgz "$url"; \ echo "${goRelSha256} *go.tgz" | sha256sum -c -; \ tar -C /usr/local -xzf go.tgz; \ rm go.tgz; \ \ if [ "$goRelArch" = 'src' ]; then \ echo >&2; \ echo >&2 'error: UNIMPLEMENTED'; \ echo >&2 'TODO install golang-any from jessie-backports for GOROOT_BOOTSTRAP (and uninstall after build)'; \ echo >&2; \ exit 1; \ fi; \ ``` --- # Shell script example (cont.) ```bash \ export PATH="/usr/local/go/bin:$PATH"; \ go version ``` Source: https://github.com/docker-library/golang/blob/master/Dockerfile-debian.template#L14 --- # Transition * Good * Full Ansible power. * You can utilize your Ansible roles. * Bad * shell → Ansible (`import` command helps here) * You may need to learn new things. (is this actually bad?) * Some Ansible tasks are more complex than Dockerfile instructions. ??? * Dockerfile - new DSL * Compose file - new format, specific to a single platform --- # COPY vs copy module ```dockerfile COPY file /path/inside/image ``` vs. ```yaml - name: Install file copy: src: file dest: /path/inside/image ``` --- # COPY vs copy module ```dockerfile COPY file /path/inside/image *RUN chmod 0644 /path/inside/image && chown app /path/inside/image ``` vs. ```yaml - name: Install file copy: src: file dest: /path/inside/image * owner: app * mode: 0644 ``` --- # Ansible Container project ## Workflow 1. `init` 2. `install` 3. `build` 4. `run` 5. `push` 6. `deploy` --- # Ansible Container project ## Pros * Utilize Ansible Container-ready roles from Ansible Galaxy. * Not just images, deployable units! * Support complete lifecycle of the application. * Use Ansible, the universal markup, to create images. * Actively developed. --- # Ansible Container project ## Cons * Not mature yet. ??? * corner cases * complex deployments --- # Container-enabled Ansible roles * Define how the Ansible role is meant to be used in container environment. --- # container.yml * Single definition of the application. * Build images. * How to run in development. * How to deploy to a production cloud environment. -- * https://github.com/chouseknecht/django-gulp-nginx/blob/master/container.yml ??? * also configuration of ansible-container --- # container.yml ```yaml defaults: POSTGRES_USER: django POSTGRES_PASSWORD: sesame POSTGRES_DB: django DJANGO_ROOT: /django DJANGO_USER: django DJANGO_PORT: 8080 DJANGO_VENV: /venv NODE_USER: node NODE_HOME: /node NODE_ROOT: '' GULP_DEV_PORT: 8080 ``` --- # container.yml (cont.) ```yaml services: django: from: 'centos:7' roles: - role: django-gunicorn environment: DATABASE_URL: 'pgsql://{{ POSTGRES_USER }}:{{ POSTGRES_PASSWORD }}@postgresql:5432/{{ POSTGRES_DB }}' DJANGO_ROOT: '{{ DJANGO_ROOT }}' DJANGO_VENV: '{{ DJANGO_VENV }}' expose: - '{{ DJANGO_PORT }}' working_dir: '{{ DJANGO_ROOT }}' links: - postgresql user: '{{ DJANGO_USER }}' command: ['/usr/bin/dumb-init', '{{ DJANGO_VENV }}/bin/gunicorn', -w, '2', -b, '<IP_ADDRESS>:{{ DJANGO_PORT }}', 'project.wsgi:application'] entrypoint: [/usr/bin/entrypoint.sh] ``` --- # container.yml ## Development overrides ```yaml django: dev_overrides: volumes: - '$PWD:{{ DJANGO_ROOT }}' command: [/usr/bin/dumb-init, '{{ DJANGO_VENV }}/bin/python', manage.py, runserver, '<IP_ADDRESS>:{{ DJANGO_PORT }}'] depends_on: - postgresql ``` ```yaml nginx: dev_overrides: ports: [] command: /bin/false ``` --- # Bright future * Preparation for 1.0: * No conductor rebuilds after every `ansible-container build`. * Provide pre-built conductor images based on different distributions. * Target images based on Python 3. -- * Establish ansible-container SIG. -- * Post 1.0: * Keep conductor images up to date. --- class: center, middle # We need your feedback! ??? * who have already used ansible-container? * what's your use case? * how complicated your setup is? * would you join the sig? --- # Thank you! *
[ansible/ansible-container](https://github.com/ansible/ansible-container) *
[ansible/ansible-container-demo](https://github.com/ansible/ansible-container-demo) * `#ansible-container` channel on [irc.freenode.net](https://freenode.net/) * [https://groups.google.com/forum/#!forum/ansible-container](https://groups.google.com/forum/#!forum/ansible-container) *
[TomasTomecek/ansiblefest2017-talk](https://github.com/TomasTomecek/ansiblefest2017-talk)


Class KeepaliveSessionStrategy
Inheritance
System.Object
KeepaliveSessionStrategy
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: x2net
Assembly: x2net.dll
Syntax
public class KeepaliveSessionStrategy : HeartbeatStrategy.SubStrategy
Properties
| Improve this Doc View SourceHasReceived
Declaration
public bool HasReceived { get; set; }
Property Value
| Type | Description |
|---|---|
| System.Boolean |
HasSent
Declaration
public bool HasSent { get; set; }
Property Value
| Type | Description |
|---|---|
| System.Boolean |
Methods
| Improve this Doc View SourceOnHeartbeat()
Declaration
public override bool OnHeartbeat()
Returns
| Type | Description |
|---|---|
| System.Boolean |
Overrides
| Improve this Doc View SourceOnReceive()
Declaration
public override void OnReceive()
Overrides
| Improve this Doc View SourceOnSend(Event)
Declaration
public override void OnSend(Event e)
Parameters
| Type | Name | Description |
|---|---|---|
| Event | e |
Overrides
| Improve this Doc View SourceProcess(Event)
Declaration
public override bool Process(Event e)
Parameters
| Type | Name | Description |
|---|---|---|
| Event | e |
Returns
| Type | Description |
|---|---|
| System.Boolean |


Audio Processing in iOS - an initial step
Performing with audio is always a challenge for any developer by reason of its very low level. By chance, I got some opportunities to do with audio included playing, recording and pre (and/or) post processing. This post tends to cover as much as possible basic knowledge in Audio aspect for two reasons: reminding myself and sharing with other enthusiastic guys.
In the first words, I want to warn that I am working on iOS platform at the moment. Therefore, all of knowledge appear here is of iOS or related to iOS by default.
Basic
Before dig into details, we should know a litle bit about audio format, audio codec and what format is preferred in iOS.
Audio Format and Codec
General speaking, there are two elements of an audio file. It’s weird, huh? Don’t worry! First, codec and second, file format. Codec is the way audio file is encoded (for recording) or decoded (for playback). We must know the codec of audio file to perform some processing tasks such as uncompressing to play or mixing to make effects. The latter one, format is the way audio file is organized.
Audio Format
Audio Codec
Bit rate
(hook)
Playback
Player must decode audio file if it want to play a song. In fact, iOS has two approaches to decode audio file: software-based and hardware-assisted. The biggest difference is that the first method allows multiple files to play simutaneously whereas the second way don’t. Because of that, hardware-assisted method is very fast and gives excellent performance while software-based may lead to CPU overhead state if it has to handle many sound files in the same time. As a result, if you need to maximize video frame rate (make application be more smooth), there are two ways:
- Minimize the CPU impact of your audio playback by using uncompressed audio or the IMA4 format.
Or
- Use hardware-assisted decoding of your compressed audio assets.
Preferred Audio Formats (in iOS, certainly)
Just recall that there are two types of audio quality: uncompressed audio and compressed audio. In short words, uncompressed audio is always better than the remaining kind but it is true for professional listener not for all people. Because of two these existing types, Apple also defines two preferred formats respectively.
For uncompressed audio (highest quality), use 16-bit, little endian, linear PCM audio data packaged in a CAF file. You can convert an audio file to this format in Mac OS X using the afconvert command-line tool, as shown here:
/usr/bin/afconvert -f caff -d LEI16 {INPUT} {OUTPUT}
For compressed audio when playing one sound at a time, and when you do not need to play audio simultaneously with the iPod application, use the AAC format packaged in a CAF or m4a file.
For less memory usage when you need to play multiple sounds simultaneously, use IMA4 (IMA/ADPCM) compression. This reduces file size but entails minimal CPU impact during decompression. As with linear PCM data, package IMA4 data in a CAF file.
Excerpt from Preferred Audio Formats in iOS - developer.apple.com. ## Frameworks
Libraries
Conclusion
References
- Audio Tutorial for iOS: File and Data Formats by Raywenderlich
- Apple’s Docummentation
- Learning Core Audio: A Hands-On Guide to Audio Programming for Mac and iOS by Chris Adamson and Kevin Avila.
- Chris Adamson slideshare. Sharing a plenty of precious knowledge.
Open sources which are mentioned above
- The Amazing Audio Engine
- OpenAL
- Sound Engine - an OpenAL Example
- EZAudio. For showing audio wave.
Bonus
###The differences between Audio Engine and OpenAL - OpenAL: no some functions such as Reverb (Roger Beep, Distortion, Obstruction, and Occlusion must be tested more) but Audio Engine has.
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| Name | Description | Status |
|---|---|---|
| Beta Release 0.9 | The initial beta release of the Lattice application | Completed |
| Name | Description | Status |
|---|---|---|
| Beta Release 0.9 | The initial beta release of the DB Setup application | Completed |
| Name | Description | Status |
|---|---|---|
| Beta Release 0.9 | The initial beta release of the AutoWork application | Completed |
| Name | Description | Status |
|---|---|---|
| Beta Release 0.9 | The initial beta release of the DGP Web Applications | Completed |
| Name | Description | Status |
|---|---|---|
| Beta Release 0.9 | The initial beta release of the DGP Web Services | Completed |


IN CUSTODY A film review by James Berardinelli Copyright 1994 James Berardinelli Rating (0 to 10): 5.7
Date Released: varies Running Length: 2:03 Rated: PG (Mature themes)
Starring: Om Puri, Shashi Kapoor, Shabana Azmi, Sushma Seth, Tinnu Anand, Neena Gupta Director: Ismail Merchant Producers: Whahid Chowhan Screenplay: Anita Desai and Shahrukh Husain based on the novel by Anita Desai Cinematography: Larry Pizer Music: Zakir Hussain and Ustad Sultan Khan Released by Sony Pictures Classics In Urdu and Hindi with subtitles
The most stimulating and intellectually-challenging of ideas do not always make the best of movies. IN CUSTODY is a prime example of this. There is much meat here to chew on, but the flavor is in doubt. By devoting all its attention to a dry, didactic examination of the disappearance of the Urdu language, this movie has filled the screen with poorly-realized characters that function as little more than mouthpieces for getting across the director's point-of-view.
Back in the early days of Merchant-Ivory, before the producer/director team turned their attention to sumptuous British dramas (such as A ROOM WITH A VIEW, HOWARDS END, and THE REMAINS OF THE DAY), films such as SHAKESPEARE WALLAH explored India and Indian themes. In Ismail Merchant's directorial debut, this part of the world is again visited, albeit with considerably less impact.
The story begins with a meek teacher named Deven (Om Puri) attempting to arrange a meeting with the great Urdu poet Nur (a corpulent Shashi Kapoor, who was much trimmer when he appeared in SHAKESPEARE WALLAH). Armed with an antiquated reel-to-reel tape recorder, Deven overcomes the financial demands of one of Nur's wives (Sushma Seth), and the jealousy of the other (Shabana Azmi) to conduct the interview. Much to his dismay, however, Nur is not the great man that his reputation suggests. Rather than reciting verse and sharing his philosophical views on life, he would rather drink rum and eat biryani.
Despite excellent performances from veteran actors Om Puri and Shashi Kapoor, the two main characters in IN CUSTODY lack depth. They function as Merchant's tools to examine the dissolution of a language and the subsequent impact of that event on Indian culture as a whole. Never is a substantial emotional bond forged between the viewer and either Deven or Nur. When a film can't make an audience care about the protagonists, how much more imposing a task is it to generate interest in an issue?
There are flashes of near-brilliance in IN CUSTODY. The principal theme--the shunting aside of Urdu for Hindi--is intellectually engaging. The parallels between the language's decline and that of its premier poet are equally worthy of exploration. Also, Merchant displays a deft hand at capturing the essence of a poverty-stricken India being reluctantly forced into the electronic age.
Unfortunately, the glue to hold these elements together isn't in place. The tone, with its bursts of comedy and out-of-place melodrama, is uneven, and IN CUSTODY's running time is far too long. But the real disappointment is that Deven and Nur are never more than shadows of the personalities that they could be. Too much time that could be used to delve beneath the surface currents of these mens' lives is devoted too reading poetry.
Individual appreciation of IN CUSTODY will largely depend on what you expect from a film. Too many of today's theatrical offerings fall into the "all form, little substance" category. In this case, the opposite is true. What might make for an interesting dissertation doesn't fare nearly as well in the context of a motion picture.
- James Berardinelli<EMAIL_ADDRESS>.
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


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AIMA MAT December phase 2 exam postponed: Check revised dates, exam pattern
by Education DeskBy: Education Desk | New Delhi | Published: December 9, 2019 9:25:38 pm
AIMA MAT December phase 2 exams have been postponed (Representational image)
AIMA MAT December phase 2: The All India Management Association (AIMA) has revised the dates to conduct the phase II of Management Aptitude Test (MAT). The exam is conducted both online as well as offline. As per the latest notice, the last date to apply for the computer-based test (CBT) has been extended till December 9 and hence the CBT will be conducted on December 14 and the paper-based test (PBT) will be conducted on December 15.
The PBT and CBT exams were to be conducted on December 8 and 14, respectively. Earlier, phase I December exams have been conducted on December 1 and 6. Candidates can check the details and download admit card for phase 2 PBT and CBT on December 15 and December 14, respectively from the official website, mat.aima.in.
MAT is an entrance exam conducted to enrol students for MBA and allied programmes. A total of 600 B-Schools across India accept MAT score. It is conducted four times a year across over 50 cities in both online and offline modes.
The MAT has five sections – language comprehension, mathematical skills, data analysis and sufficiency, intelligence and critical reasoning, India and global environment – each constitutes for 40 questions. Candidates will have to answer 200 questions in 150 minutes.
For all the latest Education News, download Indian Express App
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- Tags:
- AIMA
- college admissions


Using the startMainLoop function and LoadingBar
The optional debug mode bar on the top shows a log of render/update frames the main loop has processed.
- Green lines are updates which were rendered to the screen.
- Orange lines are updates which were not rendered to the screen.
- White lines are frames on which the game state was not updated.
Press f to fast-forward time in the debug mode.


Born Quixadá and Lives in Quixadá. My broad research goal is to help build more efficient computer network more efficiently. To do this I'm using Network Functions Virtualization and Software Defined Network. Nowadays, I'm more interested in the Internet of thing, Cloud Computing and Vehicular ad hoc networks (VANETs). Link to Lattes Here.
One more thing...
"Education is the most powerful weapon which you can use to change the world". Nelson Mandela.
Tecg.º in Computer Networking at Federal University of Ceara.
English course at Estadual University of Ceara .
Master in Computer Science at CIn - Federal University of Pernambuco.
I have the privilege to work with these cool companies.
Researcher at IANG - Intelligent Advanced Network Group.
Teacher - Computer Networking, Distributed Systems and Information Security.
infrastructure analyst - Service Management and Server / DataCenter. Elaborate strategies for improvement and network scalability, management and deployment of private cloud lab (LSBD).
Nowadays, I'm more interested in work with this technology.


{% extends "base.html" %} {% block content %}
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Detail: {{ reason }}


|
AceSegment
0.13.0
A library for rendering seven segment LED displays using the TM1637, TM1638, MAX7219, HT16K33, or 74HC595 controller chips
|
An implementation of LedModule using the TM1638 chip. More...
#include <Tm1638Module.h>
Public Member Functions | |
| Tm1638Module (const T_TMII &tmiInterface, const uint8_t *remapArray=nullptr) | |
| Constructor. More... | |
| void | begin () |
| Initialize the module. More... | |
| void | end () |
| Signal end of usage. More... | |
| void | setDisplayOn (bool on=true) |
| Turn off the entire display. More... | |
| bool | isFlushRequired () const |
| Return true if flushing required. | |
| void | flush () |
| Send segment patterns of all digits plus the brightness to the display. More... | |
| uint32_t | readButtons () const |
| Read the 4 bytes with key information. More... | |
| Public Member Functions inherited from ace_segment::LedModule | |
| LedModule (uint8_t *patterns, uint8_t numDigits) | |
| Constructor. More... | |
| uint8_t | getNumDigits () const |
| Return the number of digits supported by this display instance. More... | |
| uint8_t | size () const |
| Return the number of digits supported by this display instance. | |
| void | setPatternAt (uint8_t pos, uint8_t pattern) |
| Set the led digit pattern at position pos. | |
| uint8_t | getPatternAt (uint8_t pos) const |
| Get the led digit pattern at position pos. | |
| void | setBrightness (uint8_t brightness) |
| Set global brightness of all digits. More... | |
| uint8_t | getBrightness () const |
| Get the current brightness. | |
| void | setDecimalPointAt (uint8_t pos, bool state=true) |
| Set decimal point. | |
Friends | |
| class | ::Tm1638ModuleTest_flush |
Additional Inherited Members | |
| Protected Member Functions inherited from ace_segment::LedModule | |
| void | begin () |
| Subclasses should call this from its own begin(). | |
| void | end () |
| Subclasses should call this from its own end(). More... | |
| void | setDigitDirty (uint8_t pos) |
Set the dirty bit of digit pos . | |
| void | clearDigitDirty (uint8_t pos) |
Clear the dirty bit of digit pos . | |
| bool | isDigitDirty (uint8_t pos) const |
Check the dirty bit of digit pos . | |
| void | clearDigitsDirty () |
| Clear dirty bits of all digits. | |
| bool | isAnyDigitDirty () const |
| Return true if any digits are dirty. | |
| bool | isBrightnessDirty () const |
| Check if the brightness level is dirty. | |
| void | setBrightnessDirty () |
| Mark the brightness as dirty. | |
| void | clearBrightnessDirty () |
| Clear the dirty bit for brightness. | |
An implementation of LedModule using the TM1638 chip.
The chip communicates using a protocol that is electrically similar to SPI.
| T_TMII | class that implements the three wire SPI-like protocol interface for TM1638, usually one of the classes from the AceTMI library: SimpleTmi1638Interface or SimpleTmi1638FastInterface. |
| T_DIGITS | number of digits in the LED module (usually 8) |
Definition at line 65 of file Tm1638Module.h.
|
inlineexplicit |
Constructor.
| tmiInterface | instance of TM1638 interface class |
| remapArray | (optional, nullable) a mapping of the logical digit positions to their physical positions, useful for 8-digt LED modules whose digits are wired out of order |
Definition at line 75 of file Tm1638Module.h.
|
inline |
Initialize the module.
The SimpleTmi1638Interface or SimpleTmi1638FastInterface object must be initialized separately.
Definition at line 92 of file Tm1638Module.h.
|
inline |
|
inline |
Send segment patterns of all digits plus the brightness to the display.
Performance, for sending 8 digits (total of 1+1+16+1 = 19 bytes), using a 1 microsecond delay, on an SparkFun Pro Micro (AVR):
The isFlushRequired() method can be used to optimize the number of calls to flush(), but often it is not necessary.
Definition at line 142 of file Tm1638Module.h.
|
inline |
Read the 4 bytes with key information.
Use little-endian ordering since the bits in each byte come out of the device in LSBFIRST order. In other words, first byte is the least signficant byte of the 32-bit result, and bit0 of the first byte is the first bit that streamed out of the device.
Definition at line 187 of file Tm1638Module.h.
|
inline |
Turn off the entire display.
The brightness is not affected so when it is turned back on, the previous brightness will be used.
Definition at line 112 of file Tm1638Module.h.


PureBasic - Light
概要
Lights are essential components in order to create worlds which look realistic. As with real life light, it is possible to specify many attributes of this light such as: the color, specular color, direction and more. InitEngine3D() must be called successfully before using the light functions.
命令索引
CopyLight
CreateLight
DisableLightShadows
FreeLight
GetLightColor
HideLight
IsLight
LightAttenuation
LightDirection
LightDirectionX
LightDirectionY
LightDirectionZ
LightID
LightLookAt
LightPitch
LightRoll
LightX
LightY
LightYaw
LightZ
MoveLight
RotateLight
SetLightColor
SpotLightRange
示例
Light.pb
已支持操作系统
所有


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| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object com.mediatek.bluetoothle.BleProfileServer
public class BleProfileServer
Class for representing a GATT profile server It's only used in the process of BluetoothLe
| Field Summary |
|---|
| Fields inherited from interface com.mediatek.bluetoothle.IBleProfileServer |
|---|
ANP, FMP, PASP, PXP, RET_FAILURE, RET_PROFILE_ALREADY_STARTED, RET_SUCCESS, TIP |
| Constructor Summary | |
|---|---|
BleProfileServer(IBleProfileServerObjectPool pool,
int profile)
Constructor for BleProfileServer |
| Method Summary | |
|---|---|
void |
cancelConnection(android.bluetooth.BluetoothDevice device)
Disconnects an established connection, or cancels a connection attempt currently in progress |
boolean |
connect(android.bluetooth.BluetoothDevice device,
boolean autoConnect)
Initiate a connection to a Bluetooth GATT capable device |
(package private) android.bluetooth.BluetoothGattServerCallback |
getProfileCallback()
Get callback for this BleProfileServer |
int |
getProfileId()
Query the profile which the BleProfileServer instance bound with |
android.bluetooth.BluetoothGattService |
getService(java.util.UUID uuid)
Get a service belongs to the profile based on a uuid |
java.util.List<android.bluetooth.BluetoothGattService> |
getServices()
Get all the services belongs to the profile |
boolean |
notifyCharacteristicChanged(android.bluetooth.BluetoothDevice device,
android.bluetooth.BluetoothGattCharacteristic characteristic,
boolean confirm)
Send a notification or indication that a local characteristic has been updated |
boolean |
sendResponse(android.bluetooth.BluetoothDevice device,
int requestId,
int status,
int offset,
byte[] value)
Send a response to a read or write request to a remote device |
int |
startProfileServices(android.bluetooth.BluetoothGattServerCallback callback)
To add all the services bound with the profile |
void |
stopProfileServices()
To remove all the services bound with the profile |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
BleProfileServer(IBleProfileServerObjectPool pool, int profile)
manager
- profileId
- | Method Detail |
|---|
public int getProfileId()
getProfileId
in interface IBleProfileServer
public java.util.List<android.bluetooth.BluetoothGattService> getServices()
getServices
in interface IBleProfileServer
public android.bluetooth.BluetoothGattService getService(java.util.UUID uuid)
getService
in interface IBleProfileServer
public int startProfileServices(android.bluetooth.BluetoothGattServerCallback callback)
startProfileServices
in interface IBleProfileServer
callback
- Callback used to receive incoming request
public void stopProfileServices()
stopProfileServices
in interface IBleProfileServer
public boolean notifyCharacteristicChanged(android.bluetooth.BluetoothDevice device, android.bluetooth.BluetoothGattCharacteristic characteristic, boolean confirm)
notifyCharacteristicChanged
in interface IBleProfileServer
device
- The device you want to notifycharacteristic
- The updated characteristicconfirm
- true, you need to be confirmed by the client
false,you needn't to be confirmed by the client
public boolean sendResponse(android.bluetooth.BluetoothDevice device, int requestId, int status, int offset, byte[] value)
sendResponse
in interface IBleProfileServer
device
- The remote device to send this response torequestId
- The ID of the request that was received with the callbackstatus
- The status of the request to be sent to the remote devicesoffset
- Value offset for partial read/write responsevalues
- The value of the attribute that was read/written (optional)
public boolean connect(android.bluetooth.BluetoothDevice device, boolean autoConnect)
connect
in interface IBleProfileServer
device
- The device you want to connectautoConnect
- Whether to directly connect to the remote device (false) or
to automatically connect as soon as the remote device becomes available (true)public void cancelConnection(android.bluetooth.BluetoothDevice device)
cancelConnection
in interface IBleProfileServer
android.bluetooth.BluetoothGattServerCallback getProfileCallback()
|
||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |


AT FIRST SIGHT
Reviewed by Harvey Karten, Ph.D. MGM Director: Irwin Winkler Writer: Steve Levitt, and Irwin Winkler & Rob Cowan, story by Oliver Sacks Cast: Val Kilmer, Mira Sorvino, Kelly McGillis, Steven Weber, Bruce Davison, Nathan Lane
Imagine that you've been transported to a distant planet in another galaxy, one which has the same climate and atmospheric conditions as Earth.  But that's where the familiarity ends. The signs on the stores are written in a language which appears a cross between Thai and hieroglyphics. You stretch out your hand to shake with a friendly man coming toward you, but the man knocks you flat on your back and is then paradoxically solicitous about your health.  You pick up a piece of fruit resembling a Golden Delicious apple, bite into it, and detect the taste of cardboard- -it's only the picture of an apple. After a while, you adapt to this strange and wondrous culture, you meet someone on your own wavelength, and resolve never to return to Earth.
Science fiction? Of course. The principal character of Irwin Winkler's involving new film takes such a metaphorical trip to outer space. "At First Sight" centers on a short, dramatic incident in the life of Virgil Adamson (Val Kilmer), totally blind from the age of three because of a combination of retinitis pigmentosa and congenital cataracts, a man whose father puts the boy through a series of probes conducted by all sorts of people, from professional ophthalmologists to new-age faith healers--all to no avail. Resigned to his condition, Virgil puts himself in the loving care of his older sister, Jenny (Kelly McGillis), and takes on the career of a massage therapist in an Adirondack Mountain resort not far from New York City. We don't wonder that Virgil is a popular favorite among the guests at the spa: with the increased sense of touch that a blind man develops, he becomes very good at his trade. In the PG-13 film's most erotic scene, Winkler shows Virgil easing the cares of a successful New York architect, Amy Benic (Mira Sorvino), who is literally brought to tears by her contact with Virgil's strong and seemingly enchanted palms.
Amy's fondness for Virgil grows, leading to the consummation of their mutual attraction in a sexual embrace which, compared to the earlier spectacle in the massage room, is disappointingly mechanical. When Amy suggests that Virgil submit himself to a new, experimental surgery at the famed Manhattan Eye and Ear Hospital--which counts among its practitioners the world's finest eye doctors--Virgil's reluctance gives us pause. Wouldn't any of us in his position enthusiastically agree to such surgery, whatever the odds of success? It is a tribute to Winkler's directorial skills, and to a fine script based on neurologist Oliver Sacks's book "To See and Not See," that we understand his hesitation. Not only had he gone through a long series of painful procedures as a young lad, but more important, he has grown comfortable in his limited world. Virgil is aware--as his sighted counterparts are not--that regaining the use of his eyes would be like our traveling to that distant planet. He would be like the characters in Plato's cave who finally break their chains, refusing to believe that the shadow which a fire cast on the wall was the only reality. Emerging into the sun, the occupants of the cave are soon driven back to the dark confines of their cavity, blinded by the light above and rejecting the images they see as though they were segments of a strange, satanic dream.
As though to confirm Virgil's prejudices, he is at first blinded by light, then exposed to a thousand images which bewilder him to the point of derangement. Standing in the middle of fast-moving car lanes in New York City, he refuses to believe that an onrushing vehicle could hurt him. When he spots his image in a mirror, you don't wonder that he says "hello" and is put off when he receives no answer. He walks into glass, in one case shattering it; he cannot distinguish between an apple and a picture of an apple; he observes Amy giving a brief kiss to her ex-husband and present architectural partner Sam Allanbrook (Steven Webster) and wonders, "What does that kiss mean?" He attends a noisy party with Amy and soon wants to go home because he feels he does not belong in this world. Essentially Virgil is not unlike Ray Charles, the blind jazz pianist, who once declared that he would not wish to leave his state of sightlessness because he senses a greater authenticity in his present condition.
The chemistry between Val Kilmer and Mira Sorvino is palpable, but then, when Sorvino dances with her ex- husband--who is attempting a reconciliation--the sparks fly even more. Sorvino is cute--not a beauty by Hollywood standards. With her ski-slope nose and expressive features, she is ideally cast as the credible lover of a sightless man. Sorvino is so emotive that we don't wonder that her character broke up with her husband, whom she describes as a man with the emotional depth of a soapdish, one who cried only once, when he did his tax returns three years earlier. Val Kilmer, not a great actor, is burdened with a moronic smile through most of the story, the sort of grin that psychologists often associate with a contemptuous air. Bruce Davison is far better as the doctor excited by the prospects of reversing a serious disability. This remarkable actor, who in the role of Charles Aaron combines professional dignity with an expression of genuine caring, rivets attention in every scene while Kelly McGillis, in the role of the self-sacrificing sister who enviously fears the loss of her dependent brother to another woman, performs adequately. In an all-too-small role, Nathan Lane does shtick as only he can do. He is Dr. Phil Webster, an unorthodox sight therapist who at one point takes his prize patient to a strip joint to further highlight the joys of seeing. Lane has the movie's best line. Describing the limbo separating a man who has newly regained sight and one who has spent enough time in therapy to distinguish an apple from a magazine picture, he holds that "limbo is like New Jersey: you can see all the good things that are happening; you just have to find out how to get there."
While "At First Sight" brings to mind "Beyond Silence," a portrayal of the world of the deaf, an even better correlation can be made with Ralph Nelson's 1968 charmer, "Charly," which featured Oscar-winner Cliff Robertson as the title character who is changed from a retarded baker's helper to a man of genius--only to be transformed unhappily back when the operation ultimately fails. "At First Sight," with its panoply of emotional responses, is a fine example of romantic melodrama which professionally displays the effects of dramatic change on the life of a man and of the persons whose lives he touches.
Rated PG-13. Running Time: 128 minutes. (C) 1999 Harvey Karten
The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
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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.
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FIRE DOWN BELOW (Warner Bros.) Starring: Steven Seagal, Marg Helgenberger, Harry Dean Stanton, Stephen Lang, Brad Hunt, Kris Kristofferson. Screenplay: Jeb Stuart and Philip Morton. Producers: Julius R. Nasso and Steven Seagal. Director: Felix Enriquez Alcala. MPAA Rating: R (profanity, violence, adult themes) Running Time: 98 minutes. Reviewed by Scott Renshaw.
In an uncertain world, there's something strangely reassuring about the films of Steven Seagal. The economy may rise and fall, but Seagal will always dispatch all adversaries with the same vaguely bored smirk and without a hair in his ponytail drifting out of place. You can't depend on political institutions, but you can depend on the fact that Seagal will put together a wardrobe where nary a pastel nor a T-shirt will be found. All else changes, but Seagal stays the same -- the same facial expression, the same tone of voice for every emotion, the same humorless self-importance. He is stasis personified.
There's not much new to say about FIRE DOWN BELOW, because there's not much new to see. Seagal plays a tough guy who dresses in black (for what it's worth, his name is Jack Taggart). His cause is righteous (a nasty industrialist is dumping toxic waste in a rural Kentucky coal mine, and Seagal is the E.P.A.'s resident Aikido master). Bad guys get in the way (almost invariably four or five at a time). Bones end up broken (almost invariably four or five at a time).
And none of those bones ever belong to Seagal's character. A Seagal fight sequence is uniquely monotonous not just because the hero always wins -- action heroes usually win -- but because no one ever lays a finger on him. I doubt Seagal will ever make a truly thrilling action thriller (and yes, that includes UNDER SIEGE) because his ego could never permit any doubt as to the outcome; his action scenes are like Harlem Globetrotters games without the showmanship. When he appears in one scene in FIRE DOWN BELOW with a wee cut over his left eyebrow after outracing a homicidal trucker, you wonder how much convincing it took before Seagal allowed himself to bleed.
It's that ego of his which makes so many Seagal films so wonderfully, terribly predictable.  When he stops it yet again to show off his down-home guitar stylings, you know it's because he just can't help himself. When he works with directors like Bruce Malmuth, Geoff Murphy, John Gray and now Felix Enriquez Alcala -- a virtual Who's Who of "Who's He?" -- you know it's because he's not about to take orders. And when he tries to work up some sensitive romantic chemistry with Marg Helgenberger, you want to laugh out loud at the idea that he could love anyone as much as he loves himself.
Sure, you can always count on a few token surprises, most of them completely ridiculous. There's a needless and unpleasant subplot about incestuous siblings -- nothing like dismantling Appalachian stereotypes -- and a few colorful bursts of conveniently fluorescent toxic goop. There's even Kris Kristofferson as the slimy head heavy, sharing a couple of scenes and a squinting contest for the ages with our leading man. Mostly, however, there's more of the same fight-chase-explosion narrative structure and automoton emoting which makes the latest Steven Seagal film a natural sequel to the last Steven Seagal film. There's nothing remotely entertaining about FIRE DOWN BELOW, but there's something steadying about Seagal's artistic intransigence. He won't go deserting us to do Hamlet on Broadway, or take a pay cut to work on an independent film. In turbulent times, you can almost take comfort in the knowledge that one man's name is as good as a plot description.
On the Renshaw scale of 0 to 10 forgettable fires: 2.
Visit Scott Renshaw's MoviePage http://www.inconnect.com/~renshaw/ *** Subscribe to receive new reviews directly by email! See the MoviePage for details, or reply to this message with subject line "Subscribe".
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


what is the difference between margin, border and padding?
an exploration of the box model
10 September 2020
What is the css Box Model?
In order to understand the difference between margin, border and padding you should first understand the box model and think of an element on a website as consisting of 4 nested boxes. Margin is the outer box, then border, then padding and finally the content box which holds the meat and potatoes of the element.
Margin
Border
Padding
Content
Content
This is the origin from which you are sizing and spacing this element on the page. Margin, border and padding are styled in relation to the content box. The differences we will explore between margin, border and padding will all be in relation to how those elements interact with the content they are surrounding.
Margin
Border
Padding
Content
Padding
This is the amount of space inside the box between the content and the border. Increasing the padding pushes the border away from the content.
Margin
Border
Padding
Content
Border
This is the boundary of you content box. It can visually represent the container that is holding your content within the element and is the component of the element that separates the padding from the margin.
Margin
Border
Padding
Content
Margin
This is the amount of space between the border and other elements on the page. If you have two separate elements containing content, the margin determines how much space is between the borders of the two elements. Unlike the padding, which determines the space between the content and its own border, the margin determines space outside of the border.
Margin
Border
Padding
Content
Demonstration
Below you will see some html and css used to demonstrate the qualities of margin, border and padding.
This is the html used for the example.
And this is the css used to achieve the different qalities of margin, border and padding.
As you can see below, there are two elements on the page holding content and demonstrating margin, border and padding.You will notice the space between the two elements and their borders as well as the space between the borders and the content. The margin pushes the elements out away from each other by 30px and the padding pushes the border away from the content by 60px.


This is an example that shows how the classic navbar would look on this theme.
--- layout: compress title: Demo navbar subtitle: Check how the classic navbar would look like excerpt: Check how the classic navbar would looks like permalink: "/classic-navbar" include_on_search: true header_type: "base" --- {%- include head.html -%}
{%- assign thispageurl = page.url | replace: ".html", "" -%} {%- include components/headers.html headertype= page.header_type imghero=page.header_img -%}This is an example that shows how the classic navbar would look on this theme.


--- layout: post authors: ["Greg Wilson"] title: "A Double Handful of Bootcamps" date: 2014-06-15 time: "20:00:00" tags: ["Bootcamps", "Claremont Colleges", "Duke University", "Mozilla", "UC Davis", "SESAME"] ---
The next couple of days are going to be busy, with bootcamps in Amman and Toronto, and at Duke, UC Davis, and Claremont Colleges. The week after will be just a crowded: we'll be at the universities of Reading and Notre Dame, the Canadian Applied and Industrial Mathematics Society, Rockefeller University in New York, and an event for women in science and engineering in Philadelphia. As always, we're grateful to our hosts and instructors for making all of this possible.


CrimPapers
Articles published on 22 May 2020
On 22 May 2020, 9 new articles were published in 8 journals.
Pubertal Timing and Adolescent Delinquency by Rebecca Bucci,
jeremy Staff
The Profile of Ponzi Scheme Victims in China and the Characteristics of Their Decision-Making Process by Leishi Fei, Huijie Shi, Xiaomin Sun, Jia Liu, Hongyu Shi, Yiming Zhu
Relationship Matters With Citizens Returning From Prison: Qualitative Findings From A Mentoring Program by Thomas K. Kenemore, Brent Seungho in
Police Response to the Armed and Suicidal
The Role of the Private Sector in Counter-Terrorism: A Scoping Review of the Literature on Emergency Responses to Terrorism
Investigating the Relationships Between Fatf Recommendation Compliance, Regulatory Affiliations and the Basel Anti-Money Laundering Index
The Angel: the Egyptian Spy Who Saved Israel by Raphael Cohen-Almagor
How Surrogate Impact Panels Function in the Context of Intimate Partner Violence: A Mixed-Methods Study by K. Sackett Kerrigan, Eric S. Mankowski
Understanding Women’s Help-Seeking With Intimate Partner Violence in Tanzania by Bathsheba Mahenge, Heidi Stöckl


---
layout: post
title: Homeopathic A&E
date: '2011-11-02T14:12:00.000+01:00'
comments: true
tags:
- Humour
- Health
- Facepalm
modified_time: '2011-11-02T14:12:04.054+01:00'
thumbnail: https://img.youtube.com/vi/HMGIbOGu8q0/default.jpg
blogger_id: tag:blogger.com,1999:blog-5442825777886761537.post-3206094381556455943
blogger_orig_url: http://stickmanscorral.blogspot.com/2011/11/homeopathic.html
---
Following Monday's post, which touched on the murky world of alternative medicine... South African comedian, Warren Robertson links to a brilliant Mitchell and Webb skit, "Homeopathic A&E":


|
Bullet Collision Detection & Physics Library
|
#include "btScalar.h"
Go to the source code of this file.
Classes | |
| class | btSpinMutex |
| btSpinMutex – lightweight spin-mutex implemented with atomic ops, never puts a thread to sleep because it is designed to be used with a task scheduler which has one thread per core and the threads don't sleep until they run out of tasks. More... | |
| class | btIParallelForBody |
| class | btIParallelSumBody |
| class | btITaskScheduler |
Macros | |
| #define | BT_OVERRIDE |
Functions | |
| bool | btIsMainThread () |
| bool | btThreadsAreRunning () |
| unsigned int | btGetCurrentThreadIndex () |
| void | btResetThreadIndexCounter () |
| void | btMutexLock (btSpinMutex *mutex) |
| void | btMutexUnlock (btSpinMutex *mutex) |
| bool | btMutexTryLock (btSpinMutex *mutex) |
| void | btSetTaskScheduler (btITaskScheduler *ts) |
| btITaskScheduler * | btGetTaskScheduler () |
| btITaskScheduler * | btGetSequentialTaskScheduler () |
| btITaskScheduler * | btCreateDefaultTaskScheduler () |
| btITaskScheduler * | btGetOpenMPTaskScheduler () |
| btITaskScheduler * | btGetTBBTaskScheduler () |
| btITaskScheduler * | btGetPPLTaskScheduler () |
| void | btParallelFor (int iBegin, int iEnd, int grainSize, const btIParallelForBody &body) |
| btScalar | btParallelSum (int iBegin, int iEnd, int grainSize, const btIParallelSumBody &body) |
Variables | |
| const unsigned int | BT_MAX_THREAD_COUNT = 64 |
| #define BT_OVERRIDE |
Definition at line 26 of file btThreads.h.
| btITaskScheduler* btCreateDefaultTaskScheduler | ( | ) |
Definition at line 787 of file btTaskScheduler.cpp.
| unsigned int btGetCurrentThreadIndex | ( | ) |
Definition at line 290 of file btThreads.cpp.
| btITaskScheduler* btGetOpenMPTaskScheduler | ( | ) |
Definition at line 762 of file btThreads.cpp.
| btITaskScheduler* btGetPPLTaskScheduler | ( | ) |
Definition at line 784 of file btThreads.cpp.
| btITaskScheduler* btGetSequentialTaskScheduler | ( | ) |
Definition at line 755 of file btThreads.cpp.
| btITaskScheduler* btGetTaskScheduler | ( | ) |
Definition at line 407 of file btThreads.cpp.
| btITaskScheduler* btGetTBBTaskScheduler | ( | ) |
Definition at line 773 of file btThreads.cpp.
| bool btIsMainThread | ( | ) |
Definition at line 324 of file btThreads.cpp.
|
inline |
Definition at line 70 of file btThreads.h.
|
inline |
Definition at line 88 of file btThreads.h.
|
inline |
Definition at line 79 of file btThreads.h.
| void btParallelFor | ( | int | iBegin, |
| int | iEnd, | ||
| int | grainSize, | ||
| const btIParallelForBody & | body | ||
| ) |
Definition at line 412 of file btThreads.cpp.
| btScalar btParallelSum | ( | int | iBegin, |
| int | iEnd, | ||
| int | grainSize, | ||
| const btIParallelSumBody & | body | ||
| ) |
Definition at line 439 of file btThreads.cpp.
| void btResetThreadIndexCounter | ( | ) |
Definition at line 329 of file btThreads.cpp.
| void btSetTaskScheduler | ( | btITaskScheduler * | ts | ) |
Definition at line 386 of file btThreads.cpp.
| bool btThreadsAreRunning | ( | ) |
Definition at line 381 of file btThreads.cpp.
| const unsigned int BT_MAX_THREAD_COUNT = 64 |
Definition at line 31 of file btThreads.h.


[gecode-users] installation
penche21 penche21
penche21 at hotmail.com
Mon Mar 19 18:36:42 CET 2007
Now I got examples folder running.
But when I tried my own project it gave errors nearly for every method.
Then I noticed that examples have the statement:
public class Money extends Space {...}
whereas I have - though I dont why or the difference between:
public class Project extends Gecode {..}
when I changed from extends Gecode to extends Space erros downed to 1.
>can not find symbol lex (this, matrix.row(2), IRT_LE, matrix.row(3) );
I import:
import static org.gecode.Gecode.*;
import static org.gecode.GecodeEnumConstants.*;
import org.gecode.*;
it ,somehow, yells for lex?
>From: "Mikael Zayenz Lagerkvist" <zayenz at gmail.com>
>To: "penche21 penche21" <penche21 at hotmail.com>
>CC: users at gecode.org
>Subject: Re: [gecode-users] installation
>Date: Mon, 19 Mar 2007 06:30:27 +0100
>
>Hi,
>
>If you install Gecode via the MSI provided on our web page, then you
>get the option to install Gecode/J also. Thus, you do not need to
>install the gecodej-package. Note that we updated the MSI Tuesday last
>week since there was a small problem with the old installer.
>
>The Jar-file for Gecode/J (which now is called GecodeJ.jar and not
>GecodeJava.jar) is installed in the extensions directory of Java,
>which means that you do not need to supply a classpath since the
>Jar-files in this directory are automatically loaded.
>
>As for VarMatrix<IntVar>, it is in org.gecode, so either importing
>org.gecode.* or org.gecode.VarMatrix should find it. If you still
>experience problems using the class, please tell us.
>
>Hope this helps,
>Mikael
>
>On 3/19/07, penche21 penche21 <penche21 at hotmail.com> wrote:
>>Hi,
>>
>>- I was using GecodeJ via ssh using a server that gecode has already been
>>installed. Everything was fine until I used VarMatrix<IntVar>. Then I
>>started to get "cannot find symbol symbol : class VarMatrix" error. I
>>dont
>>know which do we need extra imports to use VarMatrix?
>>
>>So I decided to install gecodeJ on my windows XP.
>>
>>- I have Jdk ready and cygwin. I installed gecodeJ.msi and downloaded
>>gecodej1.0.1.zip.
>>Under cygwin I export the path where it is installed;
>>export LD_LIBRARY_PATH=/cygdrive/c/Program\
>>Files/Gecode/lib:$LD_LIBRARY_PATH
>>
>>. Then to javac with -cp options I cant see where should be the
>>GecodeJava.jar file. It is not in gecodej1.0.1.zip neither in the
>>installed
>>Gecode folder.
>>. Is there anything more I need to make gecodeJ run.
>>. any comments on the error of VarMatrix.
>>
>>Cheers,
>>penche
>>
>>_________________________________________________________________
>>Yagmura yakalanmamak için sadece semsiyenize degil, MSN hava durumuna
>>güvenin! http://www.msn.com.tr/havadurumu/
>>
>>
>>_______________________________________________
>>Gecode users mailing list
>>users at gecode.org
>>https://www.gecode.org/mailman/listinfo/gecode-users
>>
>
>
>--
>Mikael Zayenz Lagerkvist, http://www.ict.kth.se/~zayenz/
_________________________________________________________________
En etkili ve güvenilir PC Korumayi tercih edin, rahat edin!
http://www.msn.com.tr/security/
More information about the gecode-users
mailing list


The Grail of Splendor:
Gremory's instructions were to pour some water into the Grail, then pour that water into a bottle and bring it to him.
"Pour the water."


Write code for
humans
!
Not for
machines
Show
Tips to write
good code
That
you can start applying today
Show
How to build a solid UI
with Angular
Show
Data visualization
for the web
Show
Keep in touch
mattian
matitalatina
blog.mattianatali.dev
www.mattianatali.it


class Solution { public int furthestBuilding(int[] heights, int bricks, int ladders) { PriorityQueue<Integer> pq = new PriorityQueue<>(); int index = 1; int total = 0; int val = 0; while (index<heights.length) { int diff = heights[index]-heights[index-1]; if (diff>0) { pq.add(diff); total += diff; val += diff; if (pq.size() > ladders) { val -= pq.poll(); } if (bricks < total - val) { break; } } index++; } return index-1; } }


Elon Musk: I Need 20 Years and 1000 Spaceships to Build a City on Mars
CEO of SpaceX space technology company Elon Musk has said it will take 20 years and 1,000 spacecraft to build a city on Mars, which is his long-term vision.
Musk wrote on Twitter that SpaceX will need to build about 1,000 spaceships for Mars, which will need to transport cargo, infrastructure and crew to Mars over the course of 20 years since planetary alignment only really allows for a realistically achievable Mars flight once every two years, Tech Crunch reported.
The launch costs about $ 2 million per spacecraft, and Musk says the ultimate goal is to build a "self-sustaining city of Mars."


Select your preferred date and time format to be displayed throughout the application
Working hours
Select your working hours range
Working days
Select the days in week you would be working.
Prune worklogs
Clear worklogs older than {{settings.pruneInterval}} months from local. This will not delete worklogs from Jira.
Space consumed
You have used {{spaceInfo.usedSpace | bytes}} of {{spaceInfo.totalSpace | bytes}}.
Once the remaining {{spaceInfo.freeSpace |bytes}} is used you will not be able to use the tool
to generate worklog. Hence it is necessary to prune your old worklogs using the above option.
Max hours to log
Specify the maximum number of hours to be logged per day
Auto upload worklog
All the worklogs created till previous day will be uploaded automatically on daily basis
Default meeting ticket for worklog
All the worklog created automatically for meeting will be added to this ticket.
Notify for missing worklog
Notify you to add worklog for previous day if not added
Projects
Add one or more projects which you are interested in
Rapid board
Add one or more rapid view board which you are interested in
This page allows you to integrate your calendar from external sources like Google. Worklog will be automatically created for the events in your calendar based on your preferences
Google Calendar
Enable Google calendar
Select this checkbox if you would wish to view meetings in your calendar
Integration Status
You will have to sign-in to chrome with your google account to use the calendar.
Note: You will have to authenticate with google again to use the calendar
Check for updates
Refresh the meeting invites for notification regularly in given interval
Show meeting notification
Show notification before the selected time of meeting
Auto launch hangout
Automatically launch hangout Url before the selected time of meeting
This page allows you to set what is displayed when you click on JA icon in your browser
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See: Description
| Interface | Description |
|---|---|
| JCoAbapObject |
The interface comprises public methods for access to ABAP object members.
|
| JCoAttributes |
Encapsulates a number of attributes of a connection, such as
codepage information, system information of the communication partner,
and other useful data.
|
| JCoBackgroundUnitAttributes |
Unit Attributes describing some properties of a processed bgRFC unit in the backend.
|
| JCoClassMetaData |
Encapsulates the metadata of ABAP classes.
|
| JCoCustomDestination |
A JCoCustomDestination is a customizable destination which allows to set specific user logon data
and SNC configuration parameters.
|
| JCoCustomDestination.SncConfigurationData |
SncConfigurationData allows to change the SNC configuration for a JCoCustomDestination.
|
| JCoCustomDestination.UserData |
UserData allows to change the user logon data for a JCoCustomDestination.
|
| JCoCustomRepository |
JCoCustomRepository is designed to be used for static/custom metadata. |
| JCoDestination |
JCoDestination identifies a physical destination of a function call.
|
| JCoExtendedFieldMetaData |
Encapsulates the extended metadata of a single field of either a parameter list,
a structure, or a table.
|
| JCoField |
Class to represent a data field in a record (i.e.
|
| JCoFieldIterator |
Encapsulates an iterator for the fields of a record.
|
| JCoFunction |
Class that represents a function.
|
| JCoFunctionTemplate |
Encapsulates all metadata of a function and its import, changing, export
and table parameters as well as the exception list.
|
| JCoFunctionUnit |
The interface comprises public methods to work with function unit.
|
| JCoListMetaData |
Encapsulates the metadata of either a parameter list, a request, or a response.
|
| JCoMetaData |
Encapsulates the metadata of JCo data containers.
|
| JCoParameterField |
Class to represent a data field in a parameter list.
|
| JCoParameterFieldIterator |
Encapsulates an iterator for the fields of a parameter list.
|
| JCoParameterList |
A class that encapsulates a parameter list used to pass on data
to a function.
|
| JCoRecord |
Base interface for all data containers used throughout the JCo framework.
|
| JCoRecordField |
Class to represent a data field in a structure or table.
|
| JCoRecordFieldIterator |
Encapsulates an iterator for the fields of a structure or table.
|
| JCoRecordMetaData |
Encapsulates the metadata of either a structure or a table.
|
| JCoRemoteContext |
This interface comprises all the methods an object representing a remote context of a (failed)
RFC connection is required to implement.
|
| JCoRepository |
JCo metadata repositories are needed to get the technical description
of functions and parameters used for fulfilling RFC calls.
|
| JCoRepositoryQueryResult |
JCoRepositoryResult describes the result of the repository query.
|
| JCoRequest |
A JCoRequest is a special view on a JCoFunction and is used in the
Request/Response model of JCo function calls.
|
| JCoRequestUnit |
The interface comprises public methods to work with request unit.
|
| JCoResponse |
A JCoResponse is a special view on a JCoFunction and is used in the
Request/Response model of JCo function calls.
|
| JCoStructure |
JCoStructure is for data containers that need a certain layout in memory.
|
| JCoTable |
Interface that describes internal tables used in the parameter lists
of function modules.
|
| JCoThroughput |
JCo Throughput interface.
The implementation of this class stores performance data. |
| JCoTraceListener |
JCo trace listener interface.
|
| JCoUnitIdentifier |
Function unit identifier is a unique identifier for a function or request unit for bgRFC.
|
| Class | Description |
|---|---|
| About |
The About class allows getting information about JCo.
|
| JCo |
The main factory class of JCo.
|
| JCoContext |
The JCoContext class allows the execution of stateful function call sequences with JCo.
|
| JCoDestinationManager |
The JCoDestinationManager creates and manages the destinations used by JCo applications.
|
| Enum | Description |
|---|---|
| AbapClassException.Mode |
The Mode enumeration describes how class exceptions should be handled by
a server system.
|
| JCoClassMetaData.JCoAttributeKind |
An enumeration of the possible or relevant attribute types.
|
| JCoCustomRepository.QueryMode |
Enumeration that describes all modes to control the remote queries of a custom repository.
|
| JCoFunctionUnitState |
Defines possible function unit states.
|
| JCoUnitIdentifier.Type |
BgRFC unit types.
|
| Exception | Description |
|---|---|
| AbapClassException |
This class represents an ABAP class exception.
|
| AbapException |
A convenience class on top of JCoException that reports exceptions, which occurred
in an SAP system, while processing a function module.
|
| ConversionException |
A ConversionException will be thrown, if a field in a JCoRecord cannot
store a value passed to this record by a setValue call.
|
| JCoException |
General JCo exception object.
|
| JCoRuntimeException |
Basic JCo exception for JCo runtime exceptions.
|
| XMLParserException |
Exception thrown by the XML parser in the RFC communication when using
complex parameters or if the function module is tagged in the metadata
to use binary ASXML as serialization format on the line.
|
| Error | Description |
|---|---|
| OutOfNativeMemoryError |
A special OutOfMemoryError indicating that a JNI call terminated
with a return code showing that a memory allocation failed.
|
This covers
| Data container | Corresponding metadata | field (iterator) [if applicable] |
|---|---|---|
JCoFunction | JCoFunctionTemplate | n/a |
JCoParameterList | JCoListMetaData | JCoParameterField(Iterator) |
JCoRequest | JCoListMetaData | JCoParameterField(Iterator) |
JCoResponse | JCoListMetaData | JCoParameterField(Iterator) |
JCoStructure | JCoRecordMetaData | JCoRecordField(Iterator) |
JCoTable | JCoRecordMetaData | JCoRecordField(Iterator) |
JCoAbapObject | JCoClassMetaData | n/a |
JCoContext
for declaring/ending statefulnessJCo
Recommendations:
JCoExtendedFieldMetaData
and JCoTraceListener
. Other custom interface implementations are not supported.
Hence, adding a new method to any interface in this package, except to those previously mentioned two, is not considered
as an incompatible change.Copyright © 2019 SAP. All Rights Reserved.


Why start another VC firm? We love technology and seeing things grow from nothing. Individual investment is wrought with complexities that entrepreneurs prefer not to deal with. Having BV as the legal entity which founders have a relationship with ensures that BV's partners and advisors are equally invested through a firm that is founded in transparency and accountability. Our VC firm also enables us to have new partners join as the need arises.


Here is a label for a control down below...
An unlabeled text box:
A button labeled only with ascii symbols:
A series of buttons with non-meaningful labels:
These two buttons do not have unique labels:
These two buttons have labels that sound alike:
These form controls have empty labels:
Here are some div elements using ARIA to be a button.
Here are some form controls where the labels label the wrong controls:
Here is a text box where the label is too far away:
Here is a pair of text boxes which have the same id values:
Here is a text box with an invalid id:
This submit button should have a default label:
Here is a form control that has three labels:
Here is a form control that has the same id as another control and it's label.


Our Privacy Policy
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F5 Identity and Access Management Solutions > Class 5: AD FS Proxy Lab Source | Edit on
Module: Connect and Validate Environment¶
In this module you will validate that ADFS and the application that requests ADFS authentication are functioning without the BIG-IP in the traffic flow.
Open an RDP session to the client machine¶
- Open an RDP session to the client jumphost
- Login with username: user and password: user
Change Client to Point at ADFS-1 Direct (BIG-IP not in traffic flow)¶
- Double click the “ADFS-1 Direct” desktop shortcut
- You should receive a notification that the HOSTS file now points adfs.vlab.f5demo.com directly at the ADFS-1 server.
Open the BIG-IP Management Interface¶
- Open Chrome
- Click the BIG-IP shortcut
- Login with username: admin and password: admin
- Nothing needs to be done here now, you are only validating you can access the BIG-IP.
Verify ADFS and App are Functional¶
- Close any open Chrome incognito windows
- Open Chrome if not already open
- Right click the “ADFS Demo App” shortcut and click “open in incognito window”
VERY IMPORTANT: For all testing in this lab, close all incognito windows first, then open a new one for your test. This will ensure you do not have issues related to cache or cookies.
- You should see a set of claims displayed in the claims app at app.vlab.f5demo.com
- If the request failed and you do not see claims then the ADFS-1 Windows server may not have started correctly or may not be finished starting. It must be fixed before proceeding. If the lab has just started, wait a few moments. If it is still not working, you have two options:
Option 1: You can restart services on the ADFS servers from your client with the shortcut on the desktop. This is the fastest option.
Option 2: You can restart the ADFS-1 and then ADFS-2 servers. This is much slower.
You should now see the following:
- Note that ADFS identified the user as inside the corporate network because they did not go through an MS-ADFSPIP compliant proxy.
- What happened:
- You made a request to App
- App redirected you to ADFS for authentication
- ADFS authenticated you automatically with Windows Integrated Authentication with your domain joined computer
- ADFS redirected you back to App with a WS-Fed assertion
- App validated the assertion and displayed the claims it received from ADFS
You should close all browser windows in the client and repeat these steps to validate ADFS-2 using the desktop shortcut labeled “ADFS-2 Direct”. If it fails, use the desktop shortcut to restart ADFS services as noted above.


{{ .Title }}
{{ .Params.subTitle }}A Microservice Architecture breaks up the monolith into many smaller pieces that are composed together. Patterns to secure the communication between services like fault tolerance (via timeout, retry, circuit breaking, etc.) have come up as well as distributed tracing to be able to see where calls are going. A service mesh can now provide these services on a platform level and frees the application writers from those tasks. Routing decisions are done at the mesh level. Kiali works with Istio to visualise the service mesh topology, features like circuit breakers or request rates. Kiali also includes Jaeger Tracing to provide distributed tracing out of the box.
Get started


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{#- scroll to top button -#} {%- if theme_show_scrolltop | lower == "true" -%} {%- endif -%}


Scrum Trainning
Why Agile? Well...
At a certain point all of us may agree with this image.
Agenda
What we will be having fun with during the next hours.
-
Differences!
Agile vs Classic Product Development
-
Culture!
Agile Values and Basic Principles
-
Who?
Scrum Roles and Process
-
How!
Basics of Agile Product Development
1.
Agile
vs
Classic Product
Classic product development
What about teamwork?
Watterfall can be compared to a relay race
Seems to me that this approach does not promote a complete team environment.
What about considering a cooperative approach?
Agile
Core idea of agile software development is a continuous (incremental) development of the product while continuously considering customer feedback.
2.
Agile Values
and
Basic Principles
Manifesto Values
Individuals and interactions over processes and tools.
Working software over comprehensive documentation.
Customer collaboration over contract negotiation.
Responding to change over following a plan.
"That is, while there is value in the items on the right, we value the items on the left more."
Agile Principles I
1. Highest priority is to satisfy the customer with early and continuous deilvery of valuable software.
2. Welcome changes even in late development.
3. Deliver working software frequently, from a couple of weeks to a couple of months.
4. Business people and developers must work together daily throughout the project.
Agile Principles II
5. Build projects around motivated individuals. Give them the environment and support they need, and trust them to get the job done.
6. The most efficient and effective method of conveying information to and within a development team is face-to-face conversation.
7. Working software is the primary measure of progress.
8. Agile processes promote sustainable development and keep a constant pace indefinitely.
Agile Principles III
9. Continuous attention to technical excellence and good design enhances agility.
10. Simplicity--the art of maximizing the amount of work not done--is essential.
11. The best architectures, requirements, and designs emerge from self-organizing teams.
12. At regular intervals, the team reflects on how to become more effective, then tunes and adjusts its behavior accordingly.
3.
Scrum roles
and
Development process
Scrum Terminology
Scrum is a Rugby formation - players stand closely in touch with each other.
- Focus on Team
- Joint discussion of the next move
- Self organization
Scrum is a Proccess-Framework.
- Lightweight
- Easy to understand
- Hard to master
Scrum Components
Product Owner (PO)
The PO is owner of the product and steers the development of the product from the functional point of view. He maximizes the product value by maximizing the outcome of the development team work.
Tasks
- Bundle knowledge about the product and its environment.
- Maintain the product backlog by creating and sorting product backlog items (PBIs).
- Provides the developers enough information about the product and the PBIs, so they can implement them.
PO and the Value Curve
In simple terms, PO is the person in charge to determine what brings more value to the product faster.
Developers
The Developers steer the development of the product from a technical point of view. Main goal is to transfer PBIs into increments.
Properties
- Size: 3-9 (why?)
- Self organizing
- Cross-Functional
- No hierarchies, no sub roles
Scrum Master
The Scrum Master is responsible that Scrum is understood and enacted. He is consultant for Scrum itself. For doing so, monitors the way the team works and supports it if desired.
The more unexpererienced the team is, the more important is to have a Scrum master. For experienced teams and companies the scrum master might be omitted.
Tasks
- Ask the team!
- Make himself unemployed.
- Coomunication of Scrum Values in his company.
Sprint
Kind of a Micro-Project, a container for all event and the heart of Scrum.
If the team decides for a short duration there will be space for more inspections and adaption, however in side effect there will be less space for development.
At the other hand with longer Sprints where will be less inspection but more time available for development.
Important Reminder!
An Sprint must only be cancelled in a really exceptional case, and only by the PO!
Sprint Planning
Planning is the cerimony where the PO and Devs decide what can be done during the Sprint. Eight hours or less is the recommended duration for sprint with four weeks.
Inputs
- Product Backlog
- Increment from that last Sprint
- Developer team capacity
Outputs
- Written Sprint Goal
- Sprint Baclog
Estimation
The method commonly used to estimate PBIs is called Planning Poker.
The unit used to measure the size of a PBI is called Story Point, it does not represent time, the value just tells us how big the PBIs is. For example instead of a number it is possible to use T-Shirt sizes to measure, XS, S, M, L, XL and so on.
When estimating an PBIs each member of the dev team analyses separately the PBI and chooses one card from the possible ones. The smaller the number the easy is to have that PBI completed, for example a PBI with a 3 story points is way smaller than a PBI with a 40 story points.
Daily meeting
An everyday exchange between all developers about the current activities of each team member. The duration is equals or equals fifteen minutes for a team with nine team members. It must happen at the same place and same time.
These questions should be answered by each team member
- What I have done since yesterday (since the last daily)?
- What I will do today ( until the next daily)?
- Are there blockers / impediments?
Bigger topics should be moved to an offline discussion in order to keep the timebox.
Sprint Review
The whole Scrum-Team takes part on the Sprint-Review, organized by the PO or Scrum Master, including the stakeholders (users, partners, leadership, members, etc.)
Goals
- Demonstrate the results of the recent sprint (inspection).
- Agree on next steps to increase the product value(adaptation).
Retrospective
Closed meeting for developers at the end of each sprint with an duration of three hours for a four weeks Sprint.
Goals
- Investigate the recent sprint.
- Identify potential improvements.
- Create concrete plans for improvements to realized during the next sprint.
Dev Slack
A non official Scrum cerimony, that aims to keep the team involved to search for new ways of doing things. Usually happens between the Retrospective and the Sprint Planning
During the slack develoepers can work on any tech stack that they want, study or do whatever they want that can contribute to the development of team skills. This was created to keep a maintainable environment.
The absence of pressure during this time sets free the creativity and cool stuff may arise. Usually after a couple of slacks a developer present to the others what he is working on.
Team Velocity
After the execution of a couple of Sprints it is possible determine the velocity of the team.
It isn't as precise as you may want however looking for Sprints that were completed it is a good way to predict how much work can be done.
Artifacts
Containers for results produced by the Scrum Team.
Product Backlog
A simple list of everything which can be introduced in the product during the following Sprints, ordered by priority. Only the PO can add or remove items or change priorities.
Backlog in Jira
Product Backlog Item (PBI)
Each PBI must have a description, priority, estimation (estimated by the dev team during the planning).
The PO refine and enriches PBI iteratively changing them as more is learned (product, market, technologies).
A meeting for refinement on PBIs can be done with help of stakeholders and developers, this is usually called Backlog Grooming and it is not part of official Scrum.
Level of details for PBIs
The level of detail must be reduced for PBIs that are going to be implemented later. The less the value of a PBI(from the current point in time), the less the level of detail.
Definition of Done (DoD)
The DoD serves as a checklist. It can be only set to done when all criteria of the DoD are satisfied.
Its a list created by the developers and communicated to the PO. It can be continuously improved during the sprints.
Goals
- Strenghtens trust relationship between PO and Developers.
- Facilitates a common understanding of the Developers when a task is done.
Sprint Backlog
A list containning all the PBIs that will be developed in the current Sprint.
It belongs to the developers and serve as a central point of what needs to be done and a transparent indicator to the whole Scrum-Team.
Increment
The increment is what is usually known as the Product.
Potentially shippable after each sprint.
Tips
When working in projects that has a 'defined' scope, group the team and identify all the user stories at the beginning.
After defining what is possible to be done in the future, estimate them. This will be difficult but necessary, since stakeholders will be asking for progress. These estimations will change in future but a starting point is necessary.
Developers tend to avoid this premature estimation because they thought that this will be used against them in future, however this is not the point in Scrum at all.
4.
Basics of Agile
Product Development
Automation and standardization
Testing
Agile simply does not work without testing. They must be implemented and automatized by the developer
Who never did that, huh?
Live Demo
Show tools and current status of projects.
Thanks for your attention.
References
Standing on the shoulder of giants.


user['name']
Description
Current Offers
- offer['date_date'] offer['departure'] offer['arrival'] offer['price']
- 2014/3/8 waterloo toronto $20 (test)
Previous Offers
- offer['date_date'] offer['departure'] offer['arrival'] offer['price']
- 2014/2/1 waterloo toronto $15 (test)
Comments
-
comment['user']['username']
comment['content']
-
testuser
test


The results for the EuroMillions draw for Friday, November 22, will soon be revealed.
If you're thinking buying a brand new yacht or going on that once-in-a-lifetime holiday, find out below if you have won tonight's prize.
The jackpot tonight is an estimated £14m.
Tonight's winning EuroMillions numbers will be revealed at 8.40pm.
Tonight's winning Thunderball numbers will be revealed at 8.15pm.
The biggest ever Lotto winner was created in April 2016, when an anonymous player banked £35m.
In January 2016, two ticket-holders walked away with £33m each.
Before that, a main Lotto game jackpot of £42,008,610, was drawn in January 1996 and split between three anonymous winners, with each being awarded £14,002,870.
The UK National Lottery was first drawn on November 19, 1994.
Half of all money spent by players goes to the prize fund, with 28 per cent to good causes, 12 per cent to the Government as duty and five per cent to retailers.
The final five per cent has operated the lottery throughout its history.


Container Test
By Nikhom Suksamer
Javascript Version
Ex. 0, 1, 0, 2, 1, 0, 1, 3, 2, 0, 1, 0, 2
Format incorrect: please enter number or comma or space only.
Display
Result


| Acetulan General Information
-
| Synonyms: |
Cetyl acetate; Palmityl acetate; hexadecyl acetate |
| Molecular Formula: |
C18H36O2 |
| CAS Registry No.: |
629-70-9 |
| Chemical Category: |
Others |
Usage and Performance Characteristics
-
| Manufacturer: |
Amerchol Corporation |
| Used for Products: |
Cosmetics |
Physical Properties
-
| Specific Gravity: |
0.87 (25°C) |
| Aggregate State at 25°C: |
Liquid, viscous |
Chemical Properties
-
| Iodine Value, g/100 g: |
>6 |
| Saponification Value, mg KOH/g: |
190.0 (approx) |
Optical Properties
-
| Color, Platinum-Cobalt Scale: |
<4 |
Hazard-Related Data
-
| OSHA Hazard Class: |
Not considered a hazardous substance |
Environmental Parameters
-
| Octanol-Water Partition Coeff., log Kow: |
7.74 |
| Theoretical Oxygen Demand, ThOD, g/g: |
2.92 |
Animal Toxicity
-
| Rabbit Dermal, LD50, mg/kg: |
>5,000 |
| Rat Oral, LD50, mg/kg: |
>5,000 |
Plasticizers Database (2nd Electronic Edition) Copyright © 2004 by ChemTec Publishing |


Our space in the Pioneer Square building was beautiful but increasingly cramped and we have found a new location to help us grow!
114 Alaskan Way S, Suite 506
Seattle, WA, 98104
View our visit page for more information!
In the summer of 2013, a group of idealistic intersectional feminists started a hackerspace in downtown Seattle. We are a feminist, woman-centered, trans- and queer- inclusive space for tinkerers, makers, crafters and hackers of all genders. Our goal is to offer a safe, non-intimidating environment, tools, and a supportive, friendly community to help feminist makers and hackers learn and build.
Not long after we launched, other organizers started work on feminist hackerspaces in San Francisco and Portland! We hope that this is the beginning of similar spaces starting up in cities and towns across the world.
You can help make this happen: Come join us!
We are located at 114 Alaskan Way S, Suite 506.
We hold a weekly open house on Tuesday evenings from 6:30-9PM. You can reach us for more information at<EMAIL_ADDRESS>You can also sign up for our low-volume announcements list to get updates about our events or look at other places on the web we inhabit.
If you want to start a similar space in your city, do contact us so that we can share our knowledge and experience with you.
Did you miss our IndieGogo Campaign? You can still contribute to the Seattle Attic's continuing success on our donate page.
Your gift will help fund our operations cost as well as some of our stretch goals:
You may also donate in kind. Check out this list of books/items/stuff that we would like to stock our space with.


--- layout: post title: "An F# demo of validation with partial data round trip" description: "An F# port of the previous Haskell proof of concept." date: 2020-12-28 9:22 UTC tags: [Functional Programming, F#] --- {% include JB/setup %}
{{ page.description }}
This article is part of a short article series on applicative validation with a twist. The twist is that validation, when it fails, should return not only a list of error messages; it should also retain that part of the input that was valid.
In the previous article you saw a Haskell proof of concept that demonstrated how to compose the appropriate applicative functor with a suitable semigroup to make validation work as desired. In this article, you'll see how to port that proof of concept to F#.
Like in the previous article, we're going to need some types. These are essentially direct translations of the corresponding Haskell types:
type Input = { Name : string option; DoB : DateTime option; Address : string option} type ValidInput = { Name : string; DoB : DateTime; Address : string }
The Input
type plays the role of the input we'd like to validate, while ValidInput
presents validated data.
If you're an F# fan, you can bask in the reality that F# records are terser than Haskell records. I like both languages, so I have mixed feelings about this.
Haskell's main workhorse is its type class system. F# doesn't have that, but it has computation expressions, which in F# 5 got support for applicative functors. That's just what we need, and it turns out that there isn't a lot of code we have to write to make all of this work.
To recap from the Haskell proof of concept: We need a Result
-like container that returns a tuple for errors. One element of the tuple should be a an endomorphism, which forms a monoid (and therefore also a semigroup). The other element should be a list of error messages - another monoid. In F# terms we'll write it as (('b -> 'b) * 'c list)
.
That's a tuple, and since tuples form monoids when their elements do the Error
part of Result
supports accumulation.
To support an applicative computation expression, we're going to need a a way to merge two results together. This is by far the most complicated piece of code in this article, all six lines of code:
module Result = // Result<'a ,(('b -> 'b) * 'c list)> -> // Result<'d ,(('b -> 'b) * 'c list)> -> // Result<('a * 'd),(('b -> 'b) * 'c list)> let merge x y = match x, y with | Ok xres, Ok yres -> Ok (xres, yres) | Error (f, e1s), Error (g, e2s) -> Error (f >> g, e2s @ e1s) | Error e, Ok _ -> Error e | Ok _, Error e -> Error e
The merge
function composes two input results together. The results have Ok
types called 'a
and 'd
, and if they're both Ok
values, the return value is an Ok
tuple of 'a
and 'd
.
If one of the results is an Error
value, it beats an Ok
value. The only moderately complex operations is when both are Error
values.
Keep in mind that an Error
value in this instance contains a tuple of the type (('b -> 'b) * 'c list)
. The first element is an endomorphism 'b -> 'b
and the other element is a list. The merge
function composes the endomorphism f
and g
by standard function composition (the >>
operator), and concatenates the lists with the standard @
list concatenation operator.
Because I'm emulating how the original forum post's code behaves, I'm concatenating the two lists with the rightmost going before the leftmost. It doesn't make any other difference than determining the order of the error list.
With the merge
function in place, the computation expression is a simple matter:
type ValidationBuilder () = member _.BindReturn (x, f) = Result.map f x member _.MergeSources (x, y) = Result.merge x y
The last piece is a ValidationBuilder
value:
[<AutoOpen>] module ComputationExpressions = let validation = ValidationBuilder ()
Now, whenever you use the validation
computation expression, you get the desired functionality.
Before we can compose some validation functions, we'll need to have some validators in place. These are straightforward translations of the Haskell validation functions, starting with the name validator:
// Input -> Result<string,((Input -> Input) * string list)> let validateName ({ Name = name } : Input) = match name with | Some n when n.Length > 3 -> Ok n | Some _ -> Error ( (fun (args : Input) -> { args with Name = None }), ["no bob and toms allowed"]) | None -> Error (id, ["name is required"])
When the name is too short, the endomorphism resets the Name
field to None
.
The date-of-birth validation function works the same way:
// DateTime -> Input -> Result<DateTime,((Input -> Input) * string list)> let validateDoB (now : DateTime) ({ DoB = dob } : Input) = match dob with | Some d when d > now.AddYears -12 -> Ok d | Some _ -> Error ( (fun (args : Input) -> { args with DoB = None }), ["get off my lawn"]) | None -> Error (id, ["dob is required"])
Again, like in the Haskell proof of concept, instead of calling DateTime.Now
from within the function, I'm passing now
as an argument to keep the function pure.
The address validation concludes the set of validators:
// Input -> Result<string,(('a -> 'a) * string list)> let validateAddress ({ Address = address }: Input) = match address with | Some a -> Ok a | None -> Error (id, ["add1 is required"])
The inferred endomorphism type here is the more general 'a -> 'a
, but it's compatible with Input -> Input
.
All three functions have compatible Error
types, so they ought to compose with the applicative computation expression to produce the desired behaviour:
// DateTime -> Input -> Result<ValidInput,(Input * string list)> let validateInput now args = validation { let! name = validateName args and! dob = validateDoB now args and! address = validateAddress args return { Name = name; DoB = dob; Address = address } } |> Result.mapError (fun (f, msgs) -> f args, msgs)
The validation
expression alone produces a Result<ValidInput,((Input -> Input) * string list)>
value. To get an Input
value in the Error
tuple, we need to 'run' the Input -> Input
endomorphism. The validateInput
function does that by applying the endomorphism f
to args
when mapping the error with Result.mapError
.
To test that the validateInput
works as intended, I first copied all the code from the original forum post. I then wrote eight characterisation tests against that code to make sure that I could reproduce the desired functionality.
I then wrote a parametrised test against the new function:
[<Theory; ClassData(typeof<ValidationTestCases>)>] let ``Validation works`` input expected = let now = DateTime.Now let actual = validateInput now input expected =! actual
The ValidationTestCases
class is defined like this:
type ValidationTestCases () as this = inherit TheoryData<Input, Result<ValidInput, Input * string list>> ()
This class produces a set of test cases, where each test case contains an input
value and the expected
output. To define the test cases, I copied the eight characterisation tests I'd already produced and adjusted them so that they fit the simpler API of the validateInput
function. Here's a few examples:
let eightYearsAgo = DateTime.Now.AddYears -8 do this.Add ( { Name = Some "Alice"; DoB = Some eightYearsAgo; Address = None }, Error ( { Name = Some "Alice"; DoB = Some eightYearsAgo; Address = None }, ["add1 is required"])) do this.Add ( { Name = Some "Alice"; DoB = Some eightYearsAgo; Address = Some "x" }, Ok ({ Name = "Alice"; DoB = eightYearsAgo; Address = "x" }))
The first case expects an Error
value because the Input
value has no address. The other test case expects an Ok
value because all input is fine.
I copied all eight characterisation tests over, so now I have those eight tests, as well as the modified eight tests for the applicative-based API shown here. All sixteen tests pass.
I find this solution to the problem elegant. It's always satisfying when you can implement what at first glance looks like custom behaviour using universal abstractions.
Besides the aesthetic value, I also believe that this keeps a team more productive. These concepts of monoids, semigroups, applicative functors, and so on, are concepts that you only have to learn once. Once you know them, you'll recognise them when you run into them. This means that there's less code to understand.
An ad-hoc implementation as the original forum post suggested (even though it looked quite decent) always puts the onus on a maintenance developer to read and understand even more one-off infrastructure code.
With an architecture based on universal abstractions and well-documented language features, a functional programmer that knows these things will be able to pick up what's going on without much trouble. Specifically, (s)he will recognise that this is 'just' applicative validation with a twist.
This article is the December 28 entry in the F# Advent Calendar in English 2020.