The Relativistic Doppler Shift
Introduction
Relativity is a weird and wonderful branch of physics. It is chock full of lasers, contracting objects, and terrible Star Trek references. But since it is so outlandish, it also contains many paradoxes. More often than not, these paradoxes come from the fact that we do not fully understand the rules of relativity, rather than an inconsistency of the theory itself.
Of course, a good way to make sure that you are on the right track is to check your work in a few different ways; since the theory of relativity ought to be self-consistent, there ought to be a few different ways to derive a common result. A bit of mathematical creativity will ensure that your calculations are correct and your assumptions are valid. It may even lead to a bit of deeper insight.
I offer three different derivations of the relativistic Doppler effect in this post. The first one is easy to understand, needing only the concept of time dilation and the basic tenants of special relativity. The second one is the textbook-derivation of the effect in one dimension. The final one is a derivation Doppler effect using the full Lorentz transformation in all four dimensions. It results in a surprising conclusion.
Derivation #1 - Time Dilation
The first derivation is quick and cute. Suppose an observer stands still (reference frame O) while a light source moves past him or her at some speed \(\beta = v/c\) in the +x direction (reference frame S). As the light source moves past the stationary observer (O), it radiates light in the -x direction. In reference frame S, the light has a wavelength of \(\lambda\) and a frequency of \(f_s = c/\lambda\). We want to determine the frequency of light in reference frame O (\(f_o\)).
Start with the definition of time dilation.
\[\begin{equation} t_o = \frac{t_s}{\gamma} \end{equation}\]In the equation above, \(t_o\) is a time interval measured by the observer at rest while \(t_s\) is a time interval measured by the moving source. The time intervals \(t_o\) and \(t_s\) will henceforth refer to the period of the light emitted by the source.
We know that frequency seen by the observer (\(f_o\)) is inversely proportional to the time-dilated period \(t_o\):
\[\begin{equation} \frac{1}{f_o} = \frac{t_s}{\gamma} \end{equation}\]The expression for \(t_s\) is a bit more complicated. According to both reference frames, the light moves in the -x direction with a speed \(c\). Additionally, according to reference frame S, the observer in reference frame O moves in the -x direction with a speed of \(v\). Thus, reference frame S comes to the conclusion that the wavelength of light as seen in reference frame O must be a function of the speed of light \(c\) and the speed of the observer \(v\):
\[\begin{equation} \lambda + v t_s = c t_s \end{equation}\] \[\begin{equation} \lambda = c t_s - v t_s = (c - v) t_s \end{equation}\]Solving for \(t_s\) yields:
\[\begin{equation} t_s = \frac{\lambda}{c - v} = \frac{c/f_s}{c-v} = \frac{c}{(c-v)f_s} = \frac{1}{(1-\beta) f_s} \end{equation}\]Plug your expression for \(t_s\) into the one for time dilation:
\[\begin{equation} \frac{1}{f_o} = \frac{t_s}{\gamma} = \frac{1}{(1-\beta) f_s}\frac{1}{\gamma} = \frac{1}{(1-\beta) f_s}\sqrt{1 - \beta^2} \end{equation}\]Simplifying the \(\beta\) terms yields:
\[\begin{equation} \frac{1}{f_o} = \frac{\sqrt{1-\beta^2}}{1-\beta} \frac{1}{f_s} = \frac{\sqrt{(1 + \beta)(1-\beta)}}{1-\beta} \frac{1}{f_s} = \sqrt{\frac{1 + \beta}{1-\beta}} \frac{1}{f_s} \end{equation}\]We usually write the ratio of the frequencies.
\[\begin{align} \frac{f_s}{f_o} = \sqrt{\frac{1 + \beta}{1-\beta}} \end{align}\]Derivation #2 - One Dimensional Lorentz Transformations
This is the textbook method to getting an expression for the relativistic Doppler effect. Just to keep everything simple, we will assume that our rest frame and the frame of the source coincide at time \(t = 0\). This means that the reference frames cross at (0,0). We can use the Lorentz transformations to translate position and time in the observer’s frame of reference (t,x) to position and time to the source’s frame of reference (t’,x’).
\[\begin{equation} t' = \gamma \left ( t - \beta x \right ) \end{equation}\] \[\begin{equation} x' = \gamma \left ( x - \beta t \right ) \end{equation}\]For example, if an event occurs at (T,0) in the observer’s frame of reference, then it occurs at \((\gamma T, -\gamma \beta T)\) in the source’s frame of reference. We can reverse the direction of motion (\(\beta\)) and rearrange the equations above to translate position and time in the source frame of reference (t’, x’) to position and time in the observer’s frame of reference (t,x):
\[\begin{equation} t = \gamma \left ( t' + \beta x' \right ) \end{equation}\] \[\begin{equation} x = \gamma \left ( x' + \beta t' \right ) \end{equation}\]Suppose that the moving source emits a light wave at a spacetime coordinate of (T,0) in the source reference frame. According to the observer, that event occured at the spacetime coordinate \((\gamma T, \gamma \beta T)\). Thus, that wave will reach the observer at time:
\[\begin{equation} t = \gamma T + \gamma \beta T = \gamma T (1 + \beta) = T \frac{1 + \beta}{\sqrt{1 - \beta^2}} \end{equation}\]We can simplify this expression:
\[\begin{align} t &= T \frac{1 + \beta}{\sqrt{1 - \beta^2}}\\[0.1cm] &= T \frac{1 + \beta}{\sqrt{(1 + \beta)(1 - \beta)}}\\[0.1cm] &= T \sqrt{\frac{1 + \beta}{1 - \beta}}\\[0.1cm] \end{align}\] \[\begin{align} \frac{t}{T} = \sqrt{\frac{1 + \beta}{1-\beta}} \end{align}\]We finish the derivation by noting that \(t = 1/f_o\) and \(T = 1/f_s\):
\[\begin{align} \frac{f_s}{f_o} = \sqrt{\frac{1 + \beta}{1-\beta}} \end{align}\]Derivation #3 - Tensor Formalism
I know what you are thinking. Those two derivations above were a piece of cake. Let’s up the difficulty! Bring on the tensors!
Our source is going to travel along the +x axis with a constant velocity of \(\beta\). A general Lorentz transformation \(\Lambda\) for a given reference frame moving at a constant velocity is given by:
\[\begin{equation} \Lambda_{00} = \gamma \end{equation}\] \[\begin{equation} \Lambda_{0i} = \Lambda_{i0} = - \gamma \beta_i \end{equation}\] \[\begin{equation} \Lambda_{ij} = ( \gamma - 1 ) \frac{\beta_i \beta_j}{\beta^2} + \delta_{ij} \end{equation}\]In our case, since \(\beta_y = \beta_z = 0\) and \(\beta_x = \beta\):
\[\begin{equation} \Lambda = \begin{bmatrix} \gamma & -\gamma \beta & 0 & 0\\[0.1cm] -\gamma \beta & \gamma & 0 & 0\\[0.1cm] 0 & 0 & 1 & 0\\[0.1cm] 0 & 0 & 0 & 1\\[0.1cm] \end{bmatrix} \end{equation}\]The source emits a photon with energy \(hf_s\) that travels along the -x axis. The four vectors of the photon in the source and observer reference frames are:
\[\begin{equation} x^\mu = \begin{bmatrix} hf_o\\[0.1cm] -hf_o\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} \end{equation}\] \[\begin{equation} x'^\mu = \begin{bmatrix} hf_s\\[0.1cm] -hf_s\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} \end{equation}\]Let’s solve for the four vector of the photon in the reference frame of the observer:
\[\begin{equation} x'^\mu = \Lambda x^\mu \end{equation}\] \[\begin{equation} \begin{bmatrix} hf_s\\[0.1cm] -hf_s\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} = \begin{bmatrix} \gamma & -\gamma \beta & 0 & 0\\[0.1cm] -\gamma \beta & \gamma & 0 & 0\\[0.1cm] 0 & 0 & 1 & 0\\[0.1cm] 0 & 0 & 0 & 1\\[0.1cm] \end{bmatrix} \begin{bmatrix} hf_o\\[0.1cm] -hf_o\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} = \begin{bmatrix} \gamma h f_o + \gamma \beta h f_o\\[0.1cm] -\gamma \beta h f_o - \gamma h f_o\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} = \gamma (1 + \beta) \begin{bmatrix} hf_o\\[0.1cm] -hf_o\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} \end{equation}\]We have seen that \(\gamma (1+\beta)\) term before from above:
\[\begin{equation} \begin{bmatrix} hf_s\\[0.1cm] -hf_s\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} = \left ( \sqrt{\frac{1 + \beta}{1 - \beta}} \right ) \begin{bmatrix} hf_o\\[0.1cm] -hf_o\\[0.1cm] 0\\[0.1cm] 0 \end{bmatrix} \end{equation}\]Again! We see the same ratio of \(\beta\)s that relates the frequency seen by the observer and the frequency seen by the source.
Let’s try something a little different. Suppose the photon is not directed along the x-axis. Instead, it is directed along the z-axes:
\[\begin{equation} x^\mu = \begin{bmatrix} hf_s\\[0.1cm] 0\\[0.1cm] 0\\[0.1cm] -hf_s \end{bmatrix} \end{equation}\]Once again, the source travels along the +x axis with a constant velocity of \(\beta\). Then:
\[\begin{equation} x'^\mu = \begin{bmatrix} \gamma & -\gamma \beta & 0 & 0\\[0.1cm] -\gamma \beta & \gamma & 0 & 0\\[0.1cm] 0 & 0 & 1 & 0\\[0.1cm] 0 & 0 & 0 & 1\\[0.1cm] \end{bmatrix} \begin{bmatrix} hf_s\\[0.1cm] 0\\[0.1cm] 0\\[0.1cm] -hf_s \end{bmatrix} = \begin{bmatrix} \gamma h f_s \\[0.1cm] -\gamma \beta h f_s\\[0.1cm] 0\\[0.1cm] -hf_s \end{bmatrix} \ne \begin{bmatrix} h f_o \\[0.1cm] 0\\[0.1cm] 0\\[0.1cm] -h f_o \end{bmatrix} \end{equation}\]We see something kind of strange. There does not seem to be any change in momentum along the z-direction, as expected. However, the transformation created a component of momentum along the x-direction!
In the non-relativistic case, if you are traveling at 90 degrees with respect to the motion of the source you do not see any Doppler shift. However, when you are moving at relativistic speeds, you see a Doppler shift perpendicular to the motion of the source; note the non-zero component along the x-direction. This is called the transverse Doppler effect.
Conclusion
There we have it! Three derivations of the relativistic effect, all of them yielding the same answer. As a bonus, the final derivation yielded both the Doppler effect and the transverse Doppler effect.
Until next week!


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--- layout: post title: How To Update Apache ActiveMQ Artemis date: "2016-10-29T10:17:00.000-07:00" author: "Bennet Schulz" tags: - Artemis - ActiveMQ modified_time: '2016-10-29T12:07:10.803-07:00' thumbnail: https://4.bp.blogspot.com/-CK9eop5gM80/V_JGmCGtuWI/AAAAAAAAAkA/Y_YfwNcKJZMrPn9cxNTB9otqCiXV_ewHgCLcB/s72-c/activemq-logo.png blogger_id: tag:blogger.com,1999:blog-3189340956761677857.post-152993989587029636 blogger_orig_url: http://www.bennet-schulz.com/2016/10/how-to-update-apache-activemq-artemis.html permalink: /:year/:month/:title.html ---
This blog post describes how to update a Message Broker to a newer version of ActiveMQ Artemis without copy and pasting configuration files and other stuff.
Apache ActiveMQ is a subproject of Apache ActiveMQ. It has been donated to the Apache Software Foundation in 2015. There were lots of changes in project names in the past. The Artemis project first started as JBoss Messaging and got renamed to HornetQ in August 2009. They decided to rename it and separate it as an independent project since it differs in a many ways from JBoss Messaging 1.x and they didn't want to confuse the two, quite different, systems. The vast majority of the code base of HornetQ is different to the code base of JBoss Messaging 1.x. Some years later in 2015 they donated HornetQ to the Apache Software Foundation. As a subproject of ActiveMQ it became part of the ActiveMQ umbrella.
The standard Apache ActiveMQ is runnable out of the box.
Just download it, go into the unzipped ActiveMQ folder and run this command:
./bin/activemq run
.
The ActiveMQ Artemis subproject needs an additional step to run the Message Queue.
Before running activemq run you have to create a new message broker instance.
It looks like an overhead at first glance, but becomes very practically when updating to a new Artemis version for
example.
To create a artemis broker run:
./bin/artemis create $HOME/mybroker
on your command line.
Note: I recommend choosing a different folder than the downloaded apache-artemis one to separate both from
each other.
This separation allowes you run multiple brokers with the same artemis runtime for example.
In the next step change directory (cd
) to the formerly created mybroker/bin
folder and run
the broker.
Go in the etc folder of your formerly created message broker and open artemis.profile
.
This file contains some properties like Java Opts, Clustering properties and these two locations:
As you can see, the ARTEMIS_HOME
variable is used to link the broker and the artemis runtime together.
In case you want to update your broker you can simply download the new version of ActiveMQ Artemis and change the
path in the artemis.profile of your broker instance.
That's all. There is no need to touch your broker, copy configuration files or stuff like that :-)
In my opinion the concept of the separated broker instance is really nice because it's much easier to update to a newer version of ActiveMQ Artemis than it was with standard ActiveMQ. You don't need to copy paste configuration files anymore and you don't need to be afraid of updating your Message Oriented Middleware because the separated Broker instance stays stable and compatible to newer versions without changing your configurations.
Hope you enjoyed the tutorial. Give it a try and download the current version of Artemis! It comes with a great documentation and lots of examples which are running out of the box.
Bye,
Bennet


Toolkit for fitting point process models with sequences of LASSO penalties ("regularisation paths"). Regularisation paths of Poisson point process models or area-interaction models can be fitted with LASSO, adaptive LASSO or elastic net penalties. A number of criteria are available to judge the bias-variance tradeoff.
| Version: | 1.1 |
| Depends: | R (≥ 3.0.0), spatstat (≥ 1.40-0) |
| Imports: | methods |
| Published: | 2015-01-30 |
| Author: | Ian Renner |
| Maintainer: | Ian Renner <Ian.Renner at newcastle.edu.au> |
| License: | GPL-3 |
| NeedsCompilation: | no |
| Citation: | ppmlasso citation info |
| Materials: | NEWS |
| CRAN checks: | ppmlasso results |
| Reference manual: | ppmlasso.pdf |
| Package source: | ppmlasso_1.1.tar.gz |
| Windows binaries: | r-devel: ppmlasso_1.1.zip, r-release: ppmlasso_1.1.zip, r-oldrel: ppmlasso_1.1.zip |
| OS X binaries: | r-release: ppmlasso_1.1.tgz, r-oldrel: ppmlasso_1.1.tgz |
| Old sources: | ppmlasso archive |
Please use the canonical form https://CRAN.R-project.org/package=ppmlasso to link to this page.


Objective:
Guess the randomly generated 4 digit code.
Rules:
- Each guess must consist of 4 numeric characters.
- Numbers may be used more than once!
- You win only if your guess is an exact match.
- You lose if you fail to guess the code under 10 guesses.
Results
-
Indicates a number is in the correct place.
-
Indicates a number is part of the code, but not in the right position. **
-
Indicates a number is not part of the code.
-
** Doesn't consider how many times a number exists in the code.


I am still trying to figure out my objective statement
Beginner skills
- HTML
- CSS
Education
Dev Bootcamp, Cohort July 14
Palm Beach Atlantic University, West Palm beach, FL
Bachelor of Entrepreneurship & Small Business, 2009
Experience
State Farm /Ft. Lauderdale, FL/ August 2011 to May 2014
Claims RepresentativeConducted thorough investigation and manage information; accurately analyzed and evaluated all data and results; and negotiated settlement agreements of time sensitive pre-litigation auto claims. As a result, successfully protected customers from multi-millions of dollars worth of personal financial exposure
ExamWorks/Ft. Lauderdale, FL/ September 2010 to August 2011
Reports CoordinatorFacilitated a panel of legal medical experts (i.e. Medical Doctors and Chiropractors) to provide record reviews and Independent Medical Examination (IME) reports to insurance companies and law firms in the state of Florida. Under my supervision, we implemented several strategies to improve the product and services offered to our clients. First, we organized a rigorous quality assurance process which resulted in a superior product. Additionally, we introduced a strategy which improved the turnaround time of our products by 25% within two months
Narian Technologies/ Miami, FL/ August 2009 to December 2009
Interniship-Qaulity AssuranceImplemented tests and inspections of the product’s functionality, efficiency, and design. By consistently and satisfactorily dealing with management and customer’s feedback, the quality assurance test was able to significantly improve the quality of the product. Also, conducted marketing research in which we identified target market as well as the organization’s internal and external objectives.
Luxeworld international/ Miami, F/ August 2005- May 2009
Executive Assistant Coordinated events for V.I.Ps such as celebrities, political figures, and C.E.Os. Worked with high net worth individuals all over the world. Formulated the company’s database. Help plan and bring about LuxeWorld’s television series to 27 different countries.


RAMADDA has a plugin facility that enables one to add new kinds of entry types, new content views, etc. In the RAMADDA home directory there is a "plugins" sub-directory. When RAMADDA starts up it loads all of the files in the plugins directory.
When you install a new plugin you need to restart RAMADDA.
The plugins can be built from source or are available at the
Geode Systems RAMADDA site.
To install a plugin just download the file and copy it to the RAMADDA home directory plugins directory.
There are a core set of plugins that are released in the allplugins.jar file. This file can get installed during installation or can be installed later. Once the allplugins.jar is installed any new versions of RAMADDA will automatically update this plugin.
How plugins work
RAMADDA determines what to do with a plugin file by looking at its file name.
If the file is a .zip file RAMADDA will
unzip the files in the zip file and load each one as a plugin.
If the file is a jar file it will crack open the jar file and look at each contained file.
It handles the files in the following way:
Adding map layers
You can integrate map layers from external Web Map Servers (WMS) through the plugin mechanism.
The file
chinamaps.properties.txt has an example.
Remove the ".txt" suffix and copy the properties file to your RAMADDA plugin directory. The file has instructions on
how to specify the WMS layers.


Drop this project's LICENSE file to test, or any other file to find its hashes:
NOTE: This may not work in Internet Explorer


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A synthetic and interdisciplinary forum for the presentation and peer critique of faculty and student research and practice projects, and a venue for pedagogical issues and skills for effective teaching and learning.
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B E 551 The Contemporary Built Environment (3)
Covers major or landmark cases of complex built environment projects, emphasizing the multiple dimensions involved and their interconnections.
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Systematic examination of alternative epistemological frameworks applicable to studying the built environment; examinations of their differences and similarities and of the possibility of a comprehensive, pluralistic approach.
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Preparation for ethical challenges facing professional practice, research, and teaching in the built environment. Coverage of general and professional ethics, and examination of principles and rules and application through case studies.
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Intensive reading in the literature of the built environment, directed by members of doctoral Supervisory Committee. Credit/no-credit only. Offered: AWSpS.
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Systematic study of specialized subject matter. Topics vary depending on current interest and needs, and are announced in the preceding quarter.
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Offered: AWSpS.
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--- layout: post status: publish published: true title: Episode 3.41 - Scary Scats author: display_name: Corey Fineran login: Corey email<EMAIL_ADDRESS>url: '' author_login: Corey author_email<EMAIL_ADDRESS>wordpress_id: 6219 wordpress_url: http://ivyenvy.com/?p=6219 date: '2011-09-21 06:15:41 +0000' date_gmt: '2011-09-21 11:15:41 +0000' categories: - Podcast tags: - Alfonso Soriano - Wrigley Field - Starlin Castro - Steve Clevenger - Tennessee Smokies - Rafael Dolis comments: [] ---
Andy, Corey, Kurt get together and bring Jeremy in on Skype for this episode. We discuss the length of the regular season for MLB and if it should be shortened. We compare our attendance to Cubs games in 2011 compared to seasons past. We also read an e-mail from UK Bob on his trip to Chicago to watch the Cubs.
The Cubs have called up Steve Clevenger and Rafael Dolis and we look at these two players from the Tennessee Smokies.
We go through a handful of listener-suggested topics and cover:
* Storm Troopers at Wrigley Field
* The Bears' offensive-line.
* Sunday's instant replay mess.
* Castro's pursuit of 200 hits.
* The starting rotation for the Cubs in 2012.
* Possible off-season moves.
We also consider how much we would personally spend for Soriano to not return to the Cubs in 2012.
We botch the Scary Stat of the Week and we pick a winner for the photo caption contest.


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{% extends "account/base.html" %} {% load bootstrap3 %} {% load url from future %} {% load i18n %} {% block head_title %}{% trans "Change Password" %}{% endblock %} {% block jumbotron %}
If you feel like your security is in jeopardy or just want a fresh start, change your password here


#
Server RenderingThe most common use case for server-side rendering is to handle the initial render when a user (or search engine crawler) first requests our app. When the server receives the request, it renders the required component(s) into an HTML string, and then sends it as a response to the client. From that point on, the client takes over rendering duties.
We will use React in the examples below, but the same techniques can be used with other view frameworks that can render on the server.
#
Redux on the ServerWhen using Redux with server rendering, we must also send the state of our app along in our response, so the client can use it as the initial state. This is important because, if we preload any data before generating the HTML, we want the client to also have access to this data. Otherwise, the markup generated on the client won't match the server markup, and the client would have to load the data again.
To send the data down to the client, we need to:
- create a fresh, new Redux store instance on every request;
- optionally dispatch some actions;
- pull the state out of store;
- and then pass the state along to the client.
On the client side, a new Redux store will be created and initialized with the state provided from the server. Redux's only job on the server side is to provide the initial state of our app.
#
Setting UpIn the following recipe, we are going to look at how to set up server-side rendering. We'll use the simplistic Counter app as a guide and show how the server can render state ahead of time based on the request.
#
Install PackagesFor this example, we'll be using Express as a simple web server. We also need to install the React bindings for Redux, since they are not included in Redux by default.
#
The Server SideThe following is the outline for what our server side is going to look like. We are going to set up an Express middleware using app.use to handle all requests that come in to our server. If you're unfamiliar with Express or middleware, just know that our handleRender function will be called every time the server receives a request.
Additionally, as we are using ES6 and JSX syntax, we will need to compile with Babel (see this example of a Node Server with Babel) and the React preset.
server.js
#
#
Handling the RequestThe first thing that we need to do on every request is to create a new Redux store instance. The only purpose of this store instance is to provide the initial state of our application.
When rendering, we will wrap
<App />
, our root component, inside
a <Provider>
to make the store
available to all components in the component tree, as
we saw in
"Redux Fundamentals" Part 5: UI and
React.
The key step in server side rendering is to render the initial HTML of our component before we send it to the client side. To do this, we use ReactDOMServer.renderToString().
We then get the initial state from our Redux store
using
store.getState()
. We will see how this is passed along in our
renderFullPage
function.
#
Inject Initial Component HTML and State
The final step on the server side is to inject our
initial component HTML and initial state into a
template to be rendered on the client side. To pass
along the state, we add a
<script>
tag that will attach
preloadedState
to
window.__PRELOADED_STATE__
.
The preloadedState
will then be available
on the client side by accessing
window.__PRELOADED_STATE__
.
We also include our bundle file for the client-side application via a script tag. This is whatever output your bundling tool provides for your client entry point. It may be a static file or a URL to a hot reloading development server.
#
The Client Side
The client side is very straightforward. All we need
to do is grab the initial state from
window.__PRELOADED_STATE__
, and pass it
to our
createStore()
function as the initial state.
Let's take a look at our new client file:
client.js
#
You can set up your build tool of choice (Webpack,
Browserify, etc.) to compile a bundle file into
static/bundle.js
.
When the page loads, the bundle file will be started
up and
ReactDOM.hydrate()
will reuse the server-rendered HTML. This will connect
our newly-started React instance to the virtual DOM
used on the server. Since we have the same initial
state for our Redux store and used the same code for
all our view components, the result will be the same
real DOM.
And that's it! That is all we need to do to implement server side rendering.
But the result is pretty vanilla. It essentially renders a static view from dynamic code. What we need to do next is build an initial state dynamically to allow that rendered view to be dynamic.
#
Preparing the Initial StateBecause the client side executes ongoing code, it can start with an empty initial state and obtain any necessary state on demand and over time. On the server side, rendering is synchronous and we only get one shot to render our view. We need to be able to compile our initial state during the request, which will have to react to input and obtain external state (such as that from an API or database).
#
Processing Request ParametersThe only input for server side code is the request made when loading up a page in your app in your browser. You may choose to configure the server during its boot (such as when you are running in a development vs. production environment), but that configuration is static.
The request contains information about the URL requested, including any query parameters, which will be useful when using something like React Router. It can also contain headers with inputs like cookies or authorization, or POST body data. Let's see how we can set the initial counter state based on a query parameter.
server.js
#
The code reads from the Express
Request
object passed into our server
middleware. The parameter is parsed into a number and
then set in the initial state. If you visit
http://localhost:3000/?counter=100
in your browser, you'll see the counter starts at
100. In the rendered HTML, you'll see the counter
output as 100 and the
__PRELOADED_STATE__
variable has the
counter set in it.
#
Async State FetchingThe most common issue with server side rendering is dealing with state that comes in asynchronously. Rendering on the server is synchronous by nature, so it's necessary to map any asynchronous fetches into a synchronous operation.
The easiest way to do this is to pass through some callback back to your synchronous code. In this case, that will be a function that will reference the response object and send back our rendered HTML to the client. Don't worry, it's not as hard as it may sound.
For our example, we'll imagine there is an external datastore that contains the counter's initial value (Counter As A Service, or CaaS). We'll make a mock call over to them and build our initial state from the result. We'll start by building out our API call:
api/counter.js
#
Again, this is just a mock API, so we use
setTimeout
to simulate a network request
that takes 500 milliseconds to respond (this should be
much faster with a real world API). We pass in a
callback that returns a random number asynchronously.
If you're using a Promise-based API client, then
you would issue this callback in your
then
handler.
On the server side, we simply wrap our existing code
in the fetchCounter
and receive the
result in the callback:
server.js
#
Because we call res.send()
inside of the
callback, the server will hold open the connection and
won't send any data until that callback executes.
You'll notice a 500ms delay is now added to each
server request as a result of our new API call. A more
advanced usage would handle errors in the API
gracefully, such as a bad response or timeout.
#
Security ConsiderationsBecause we have introduced more code that relies on user generated content (UGC) and input, we have increased our attack surface area for our application. It is important for any application that you ensure your input is properly sanitized to prevent things like cross-site scripting (XSS) attacks or code injections.
In our example, we take a rudimentary approach to
security. When we obtain the parameters from the
request, we use parseInt
on the
counter
parameter to ensure this value is
a number. If we did not do this, you could easily get
dangerous data into the rendered HTML by providing a
script tag in the request. That might look like this:
?counter=</script><script>doSomethingBad();</script>
For our simplistic example, coercing our input into a number is sufficiently secure. If you're handling more complex input, such as freeform text, then you should run that input through an appropriate sanitization function, such as xss-filters.
Furthermore, you can add additional layers of security
by sanitizing your state output.
JSON.stringify
can be subject to script
injections. To counter this, you can scrub the JSON
string of HTML tags and other dangerous characters.
This can be done with either a simple text replacement
on the string, e.g.
JSON.stringify(state).replace(/</g,
'\\u003c')
, or via more sophisticated libraries such as
serialize-javascript.
#
Next StepsYou may want to read Redux Fundamentals Part 6: Async Logic and Data Fetching to learn more about expressing asynchronous flow in Redux with async primitives such as Promises and thunks. Keep in mind that anything you learn there can also be applied to universal rendering.
If you use something like
React Router, you might also want to express your data fetching
dependencies as static
fetchData()
methods on your route handler
components. They may return
thunks, so that your handleRender
function can
match the route to the route handler component
classes, dispatch fetchData()
result for
each of them, and render only after the Promises have
resolved. This way the specific API calls required for
different routes are colocated with the route handler
component definitions. You can also use the same
technique on the client side to prevent the router
from switching the page until its data has been
loaded.


Now when i say "small village" i'm not being general. The village of Mushcap was just that, nestled snugly in the mossrotten wood of an old oak.(edited)
Nocturnal Wisp18-Apr-18 08:55 AM
That gnome lived alone, his only friends were Zona and Harry, but his mother only let him see them after sunset.(edited)


This test page is based on the information and examples available at
http://www.quirksmode.org/css/display.html


| I l@ve RuBoard |
According to the specified requirements, allocators have to provide the following types and operations. There are special requirements for allocators that can be used by the standard containers. Allocators that are not provided for the standard containers may have less requirements.
allocator::value_type
The type of the elements.
It is equivalent to T for allocator<T>.
allocator::size_type
The type for unsigned integral values that can represent the size of the largest object in the allocation model.
To be usable by the standard containers, this type must be equivalent to size_t.
allocator::difference_type
The type for signed integral values that can represent the difference between any two pointers in the allocation model.
To be usable by the standard containers, this type must be equivalent to ptrdiff_t.
allocator::pointer
The type of a pointer to the element type.
To be usable by the standard containers, this type must be equivalent to T* for allocator<T>.
allocator::const_pointer
The type of a constant pointer to the element type.
To be usable by the standard containers, this type must be equivalent to const T* for allocator<T>.
allocator::reference
The type of a reference to the element type.
It is equivalent to T& for allocator<T>.
allocator::const_reference
The type of a constant reference to the element type.
It is equivalent to const T& for allocator<T>.
allocator::rebind
A template structure that provides the ability that any allocator may allocate storage of another type indirectly.
It has to be declared as follows:
template <class T> class allocator { public: template <class U> struct rebind { typedef allocator<U> other; }; ... }
See page 734 for an explanation of the purpose of rebind.
allocator::allocator ()
The default constructor.
Creates an allocator object.
allocator::allocator (const allocator& a)
The copy constructor.
Copies an allocator object so that storage allocated from the original and from the copy can be deallocated via the other.
allocator::~allocator ()
The destructor.
Destroys an allocator object.
pointer allocator::address (reference value)
const_pointer allocator::address (const_reference value)
The first form returns a nonconstant pointer to the nonconstant value.
The second form returns a constant pointer to the constant value.
size_type allocator::max_size ()
Returns the largest value that can be passed meaningfully to allocate() to allocate storage.
pointer allocator::allocate (size_type num)
pointer allocator::allocate (size_type num, allocator<void>::const_pointer hint)
Both forms return storage for num elements of type T.
The elements are not constructed/initialized (no constructors are called).
The optional second argument has an implementation-specific meaning. For example, it may be used by an implementation to help improve performance.
void allocator::deallocate (pointer p, size_type num)
Frees the storage to which p refers.
The storage of p has to be allocated by allocate() of the same or an equal allocator.
p must not be NULL or 0.
The elements have to have been destroyed already.
void allocator::construct (pointer p, const T& value)
Initializes the storage of one element to which p refers with value.
It is equivalent to new((void*)p)T(value).
void allocator::destroy (pointer p)
Destroys the object to which p refers without deallocating the storage.
Simply calls the destructor for the object.
It is equivalent to ((T*)p)->T().
bool operator == (const allocator& a1, const allocator& a2)
Returns true if allocators a1 and a2 are interchangeable.
Two allocators are interchangeable if storage allocated from each can be deallocated via the other.
To be usable by the standard containers, allocators of the same type are required to be interchangeable. So, this function should always return true.
bool operator != (const allocator& a1, const allocator& a2)
Returns true if two allocators are not interchangeable.
It is equivalent to ! (a1 == a2).
To be usable by the standard containers, allocators of the same type are required to be interchangeable. So, this function should always return false.
| I l@ve RuBoard |


By default, Cygwin Process Killer is disabled. This checkbox enables the killer for all Windows platforms.
After that, result will be according to availability of Cygwin installation and return code of the termination script (see "Advanced" options)
More info:
Cygwin Process Killer Plugin


Sun Web Application Guidelines - Version 4.1
|
| Search Guidelines | Send Feedback | Developers.sun.com |
| [ Table of Contents | 0 Revision History | 1 Introduction | 2 Visual Design | 3 Windows and Pages | 4 Mastheads | 5 Top-Level Navigation | 6 Content Area | 7 Simple Elements | 8 Complex Elements | 9 Tables | 10 Topology | 11 Contextual Help | 12 Search | 13 Wizards | 14 Alerts and Messages | 15 Progress Indicators | 16 Alarms and Status Indicators | 17 Login Page | 18 Version Page | Appendices ] |
How To Use These Guidelines - An Introduction
3 Windows and Content Pages > 3.7 Primary-Content Pages
Primary-content pages contain information that is essential, important, or occurs first in a sequence. Independent of other pages with a context of their own, they are contained in main browser windows where users interact with their data and initiate tasks. Primary-content pages can remain open for longer periods of time. They support a general purpose, such as letting users view and generally maintain an object or set of objects.
Appearance and behavior of primary-content pages support the user performing multiple actions. For example, content page buttons such as "Save" allow the user to act on the page while leaving the page visible. Also, when an object is selected in the left pane, the object's properties are displayed in the right pane. For more detailed information refer to Chapter 6, Content Area Structure and Layout.
For more information on buttons and breadcrumbs refer to 7.1 Action Buttons and 6.3 Breadcrumbs and Parentage Paths.
3 Windows and Content Pages > 3.7 Primary-Content Pages
| [ Table of Contents | 0 Revision History | 1 Introduction | 2 Visual Design | 3 Windows and Pages | 4 Mastheads | 5 Top-Level Navigation | 6 Content Area | 7 Simple Elements | 8 Complex Elements | 9 Tables | 10 Topology | 11 Contextual Help | 12 Search | 13 Wizards | 14 Alerts and Messages | 15 Progress Indicators | 16 Alarms and Status Indicators | 17 Login Page | 18 Version Page | Appendices ] |
| Privacy Policy | Terms of Use | Trademarks | Copyright 2007 Sun Microsystems, Inc. |


---
layout: post
title: Treasury Dept confiscates domain names of Brit travel agent who booked Cuba
tours - Boing Boing
date: '2008-03-06T13:40:11-08:00'
tags:
tumblr_url: http://alexhwilliams.tumblr.com/post/28150685/treasury-dept-confiscates-domain-names-of-brit-travel
---
Treasury Dept confiscates domain names of Brit travel agent who booked Cuba tours - Boing Boing
Totally creepy.


Gudbox is a self-growing garden that revolutionizes how fresh food is grown. From crisp kale and spicy chilli to sweet strawberry and calming mint, this self-growing garden helps all plants thrive, automatically making sure they have the right amounts of water, light, oxygen, and nutrients. With healthy foods grown right on your windowsill, you can enjoy a higher quality of life 24/7.
You do not need to have a backyard to start enjoying fresh food at your fingertips, with Gudbox you can enjoy fresh foods and take care of them during their growth through our application.


Over the xmas holiday period I managed to acquire 2X 500mg of piperine in capsule form. Finding myself at a loose end, and with nothing else to do, I decided now was a good as time as any to try what many have attempted to call the legal alternative to xtc. At roughly 11pm, three hours after eating, I decided to pop one of the capsules. As is normally my routine when sampling stimulant-type substances, I drank a couple of beers and smoked a few weed spliffs. Donít know about anyone else but this helps me to Ďcome upí easier as it takes the edge off the first waves of nausea sometimes associated with introducing chemicals to the body.
Settling down to watch a movie, I felt nothing for about two and a half hours. This may have had something to do with the meal Iíd eaten earlier although I have heard that piperine can take a while to work. Anyway, fearing that nothing was happening I took the second capsule. Within twenty minutes I started to experience that E tingling sensation in my stomach. It felt good and I decided to slip on the headphones and listen to DJ Shadow for a while until I really started to peak. This pleasant sensation continued for about an hour or so. My jaw was clenched slightly and I could feel sweat gathering on my brow. All fairly standard stuff associated with taking MDMA. At this point I was beginning to believe that piperine could be an adequate alternative for E. How wrong I was.
Roughly just after 3 am I stated to feel a rising wave of nausea grab hold of me. This was something that had never happened to me before when getting high on any substance. Thinking it was dehydration I got up from where I was lying and went to the kitchen for a drink of water. A couple of glasses later and I was still feeling quite unpleasant. I noticed that I was having to concentrate on breathing properly. My lungs didnít feel like they were inflating fully and I was aware that my heart rate was through the roof. My pulse was racing and my eyes were so dilated that they appeared to be black. A few minutes after drinking the water I felt the need to go to the toilet. Upon attempting to urinate nothing happened for a few minutes. After it did, I was back and forth to the toilet for the next hour constantly.
At this stage I was starting to feel weak and just wanted the experience to end. I climbed into bed and tried to ride it out. The nausea was still as intense and I just couldnít control my breathing and heart rate like I normally can when Iíve taken something. Sweat was pouring off me but at the same time I felt quite cold. I sparked a spliff to try and bring me down but that just interfered with my breathing even more. Turning to the clock at the side of the bed it seemed like time had slowed down. I really felt like it was never going to end. After much tossing and turning and promising myself Iíd never do this stuff again, I managed to fall asleep for a few hours.
Upon awakening at 11am, I still felt ill. I was exhausted and weak. Worst of all was my head.  Having read other reports on piperine this seems to be a common feature of the drug. I donít suppose the beers Iíd had earlier helped in any way. To conclude, stay away from piperine. It seems alright at first but after a while it reacts in a very strange, almost toxic, way with the human body. Definitely not a suitable substitute for E.
Experience Reports are the writings and opinions of the individual authors who submit them.
Some of the activities described are dangerous and/or illegal and none are recommended by Erowid.


{{> graphPanel heading="Line Graph: Basic" subheading="An example of a simple line graph with three series." id="line-graph-basic"}}
{{> graphPanel heading="Line Graph: Area" subheading="Utilizing the showArea option." id="line-graph-area"}}
{{> graphPanel heading="Bar Graph: Basic" subheading="An example of a simple bar graph." id="bar-graph-basic"}}
{{> graphPanel heading="Bar Graph: Multi" subheading="Add another value to the same X values." id="bar-graph-multi"}}
{{> graphPanel heading="Bar Graph: Stacked" subheading="Set your bar graph to stack the series bars on top of each other." id="bar-graph-stacked"}}
{{> graphPanel heading="Bar Graph: Horizontal" subheading="Creating horizontal bar charts is as simple as it can get." id="bar-graph-horizontal"}}
{{> graphPanel heading="Pie Graph: Basic" subheading="Simple pie graph with label interpolation to show percentage." id="pie-graph-basic"}}
{{> graphPanel heading="Pie Graph: Gauge" subheading="A combination of a donut and pie graph into one." id="pie-graph-gauge"}}


Carnival_Row
Carnival Row is a fantasy-noir set in a neo-Victorian city. Mythical creatures fleeing their war-torn homeland have gathered in the city, and tensions are simmering between citizens and the growing immigrant population. We follow the investigation of a string of unsolved murders which are eating away at whatever uneasy peace still exists.


--- layout: page title: HT Shots date: 2007-11-29 16:10:22.000000000 -06:00 type: page parent_id: '17' published: true password: '' status: publish categories: [] tags: [] meta: _wp_page_template: default author: login: dreamessenceonthemove email<EMAIL_ADDRESS>display_name: darribas first_name: Daniel last_name: Arribas-Bel permalink: "/what/projects-events/projects/getting-them-online-before-they-slip-away/" ---
Do you know when you watch a film and leave the movie room thinking it was more than worth spending that time you had have to take out of some other tasks to be at that place at that time?
My University showed once the film “Paris, je t´aime”, I watched it and when I sat back in front of my laptop it came to happen I couldn´t help looking up the last scene of the movie to watch it again. Thanks god someone invented Youtube.
Then I realised there´re many shots I really like, those which sum up the whole story or that remind you the best of a movie you´ve liked it. And the best: most of them are on Youtube. Then I made up a list with some of those scenes somehow have touched me a bit deeper than the others I´ve seen. That´s what this thing is about. By the day I started it out there´re only 9 of them (those I could remember among all those which are in Youtube, not all of those I like are…), but I´d like them to soar: after all, that´d be a sign that my life is getting happier. Or rather would it be signal that Youtube is providing a better and better service…


Before Change
ray.get(actor.ready.remote())
self.actors.append(actor)
a = Actor.options(placement_group=pg).remote()
ray.get(a.ready.remote())
// 1 top level actor + 3 children.
for _ in range(total_num_actors - 1):
ray.get(a.schedule_nested_actor.remote())
// Make sure all the actors are scheduled on the same node.
// (why? The placement group has STRICT_PACK strategy).
node_id_set = set()
After Change
for _ in range(3)
])
t = create_nested_task.options(
num_cpus=1, num_gpus=0, placement_group=pg).remote(1, 0)
pgs = ray.get(t)
// Every task should have current placement group because they
// should be implicitly captured by default.
assert None not in pgs


Hi! I'm Deborah A Rwandan girl aged 21, I lives in Kigali and I'm currently a student in college of science and technology(CST). I'm is taking computer enginnering specializing in software and web development. I'm interested in full stack development and looking forward to learn more about this so to become an expert developer. I have skills in different languages including HTML & CSS , Javascript , C & C++ , Java and Python. My greatest achievement is always providing solution to the community through my technological skills. My other hobbies includes reading books,travelling, playing music instrument, being with my friends.
During my learning and working journey I have worked on different projects. Below is the links to the repositories of some of them: 1. Know and visit Rwanda This is a webpage about the beauty of Rwanda used HTML && CSS . 2.Quiz game. This game is a quiz game. you are asked a question and you respond.to play it you have to clone the code and then play it in console. used Javascript.
E-mail<EMAIL_ADDRESS>phone: (+250) 787-012-307 , (+250) 729-500-463 copyright © 2020


source file: /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/botocore/errorfactory.py
file stats: 40 lines, 12 executed: 30.0% covered
1. # Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved. 2. # 3. # Licensed under the Apache License, Version 2.0 (the "License"). You 4. # may not use this file except in compliance with the License. A copy of 5. # the License is located at 6. # 7. # http://aws.amazon.com/apache2.0/ 8. # 9. # or in the "license" file accompanying this file. This file is 10. # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF 11. # ANY KIND, either express or implied. See the License for the specific 12. # language governing permissions and limitations under the License. 13. from botocore.exceptions import ClientError 14. from botocore.utils import get_service_module_name 15. 16. 17. class BaseClientExceptions(object): 18. ClientError = ClientError 19. 20. def __init__(self, code_to_exception): 21. """Base class for exceptions object on a client 22. 23. :type code_to_exception: dict 24. :param code_to_exception: Mapping of error codes (strings) to exception 25. class that should be raised when encountering a particular 26. error code. 27. """ 28. self._code_to_exception = code_to_exception 29. 30. def from_code(self, error_code): 31. """Retrieves the error class based on the error code 32. 33. This is helpful for identifying the exception class needing to be 34. caught based on the ClientError.parsed_reponse['Error']['Code'] value 35. 36. :type error_code: string 37. :param error_code: The error code associated to a ClientError exception 38. 39. :rtype: ClientError or a subclass of ClientError 40. :returns: The appropriate modeled exception class for that error 41. code. If the error code does not match any of the known 42. modeled exceptions then return a generic ClientError. 43. """ 44. return self._code_to_exception.get(error_code, self.ClientError) 45. 46. def __getattr__(self, name): 47. exception_cls_names = [ 48. exception_cls.__name__ for exception_cls 49. in self._code_to_exception.values() 50. ] 51. raise AttributeError( 52. '%r object has no attribute %r. Valid exceptions are: %s' % ( 53. self, name, ', '.join(exception_cls_names))) 54. 55. 56. class ClientExceptionsFactory(object): 57. def __init__(self): 58. self._client_exceptions_cache = {} 59. 60. def create_client_exceptions(self, service_model): 61. """Creates a ClientExceptions object for the particular service client 62. 63. :type service_model: botocore.model.ServiceModel 64. :param service_model: The service model for the client 65. 66. :rtype: object that subclasses from BaseClientExceptions 67. :returns: The exceptions object of a client that can be used 68. to grab the various different modeled exceptions. 69. """ 70. service_name = service_model.service_name 71. if service_name not in self._client_exceptions_cache: 72. client_exceptions = self._create_client_exceptions(service_model) 73. self._client_exceptions_cache[service_name] = client_exceptions 74. return self._client_exceptions_cache[service_name] 75. 76. def _create_client_exceptions(self, service_model): 77. cls_props = {} 78. code_to_exception = {} 79. for shape_name in service_model.shape_names: 80. shape = service_model.shape_for(shape_name) 81. if shape.metadata.get('exception', False): 82. exception_name = str(shape.name) 83. exception_cls = type(exception_name, (ClientError,), {}) 84. code = shape.metadata.get("error", {}).get("code") 85. cls_props[exception_name] = exception_cls 86. if code: 87. code_to_exception[code] = exception_cls 88. else: 89. # Use the exception name if there is no explicit code 90. # modeled 91. code_to_exception[exception_name] = exception_cls 92. cls_name = str(get_service_module_name(service_model) + 'Exceptions') 93. client_exceptions_cls = type( 94. cls_name, (BaseClientExceptions,), cls_props) 95. return client_exceptions_cls(code_to_exception)


{% include sidebar.html %} If you are not redirected automatically, follow this
{{ include.post_text }}
.


SQRL
identity:
Login to
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Password
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Erase all SQRL Identity Information from Browser Memory and Disk
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Version
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Keybd shortcut
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Abbreviations
Auth
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PASS
Password required
IPM
IP address mismatch
Welcome to SQRL.
Please
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or
import
an identity by clicking on the corresponding menu item on the left.


The mount()
method adds a reference to another RawDossier at a specific path.
mount(path, name, archiveIdentifier, callback)
path
The path where the RawDossier's reference is added.
name
The name associated with added RawDossier reference.
archiveIdentifier
The string that uniquely identifies the mounted RawDossier. Usually it's the RawDossier's SEED.
callback
The function called when the mount operation is completed.
The mount()
method creates a reference to a RawDossier and keeps it in a special file stored inside the RawDossier that keeps the reference at the path
"/manifest". If a reference with the same name and at the same path
already exists, an error is thrown. The mounted RawDossier can store references to other RawDossiers. As a result,
all mounted RawDossier form a tree of arbitrary depth. Inside the tree, a RawDossier is uniquely identified by the path that leads to its
reference. For example, let's say that a RawDossier having the SEED "seed2" is mounted in a RawDossier with the SEED "seed1" at path "/foo" under
the name "bar" which, in turn,
is mounted inside the RawDossier whose SEED is "seedRoot" at path "/dir" under the name "baz". The SEED "seed2" that uniquely identifies a RawDossier
can be retrieved by traversing the path "/dir/baz/foo/bar".
In the following example the mountedRawDossier's SEED is added in rootRawDossier at path "/foo" under the name "bar".
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rootRawDossier = edfs.createRawDossier();
rootRawDossier.mount("/foo", "bar", mountedRawDossier.getSeed(), (err) => {
if (err) {
throw err;
}
console.log("Dossier successfully mounted");
});
The unmount()
method removes a reference to a RawDossier.
unmount(path, name, callback)
path
The path where the RawDossier reference is kept.
name
The name associated with the RawDossier reference.
callback
The function called when the operation is completed.
The unmount()
method deletes from the file "/manifest" the mounting point at path
identified by
name
. If no such mounting point exists,
then an error is thrown.
In the following example mounting point at path "/foo" with the name "bar" is deleted.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rootRawDossier = edfs.createRawDossier();
rootRawDossier.unmount("/foo", "bar", (err) => {
if (err) {
throw err;
}
console.log("Dossier successfully unmounted");
});
The listMountedDossiers()
method lists all the RawDossiers mounted at a specific path.
listMountedDossiers(path, callback)
path
The path where one or more RawDossiers are mounted. The path could traverse multiple RawDossiers. In other words, the sections of the path
could represent mounting points where other RawDossiers are mounted. For more details, see mount().
callback
The function called when the operation is completed.
The listMountedDossiers()
method reads the "/manifest" file from the last RawDossier in
path
and returns the list of mounting points from the file.
In the following example mounting point at path "/foo" with the name "bar" is deleted.
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rootRawDossier = edfs.createRawDossier();
rootRawDossier.unmount("/foo", "bar", (err) => {
if (err) {
throw err;
}
console.log("Dossier successfully unmounted");
});
The addFolder()
method adds all the files in a specified folder in a dossier.
addFolder(fsPath, barPath [, options] callback)
fsPath
The filesystem path where the folder is located.
barPath
The name associated with the folder entry inside the RawDossier.
options
| Optional
An object that allows to set whether the folder is encrypted or not through the property encrypt
.
If encrypt
is set to false
then the added folder is not encrypted.
If encrypt
is set to true
then the added folder is encrypted.
It also allows to specify whether the folder is added in the current RawDossier or in a RawDossier mounted in
the current RawDossier, through the property ignoreMounts
.
If ignoreMounts
is set to false
then the folder is added in the current RawDossier.
If ignoreMounts
is set to true
then the folder can be added in any RawDossier from the
tree that has as its root the current RawDossier.
If the options
argument is missing then, by default, the folder is encrypted and added in the current RawDossier.
callback
The function called when all files in the specified folder have been added to the RawDossier.
It receives an error and the dossier's hash.
The addFolder()
method reads all files inside a directory located at a specified path, breaks
them into bricks and adds an entry inside the dossier's barmap where bricks' hashes are kept.
The hashes are used to locate the bricks inside EDFS.
In the following example the folder "/home/foo/bar" is added to the RawDossier under the entry "bar".
The callback receives the dossier's hash.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.addFolder("/home/foo/bar", "bar", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
});
The extractFolder()
extracts a folder from a RawDossier to a specified location.
extractFolder(fsPath, barPath, callback)
fsPath
The filesystem path where the extracted folder is located.
barPath
The path inside the RawDossier where the folder's brick references are stored.
callback
The function when the extraction process is completed.
The extractFolder()
method reads all the brick whose references are kept inside the RawDossier at
path barPath
and combines them in order to obtain all the files inside the folder at the specified path.
In the following example the folder stored inside the RawDossier under the name "bar" is extracted at path "/home/foo/bar".
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.addFolder("/home/foo/bar", "bar", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
rawDossier.extractFolder("/home/foo/bar", "bar", (err) => {
if (err) {
throw err;
}
console.log("Successfully extracted");
});
});
The addFile()
method adds the file at a specified path in a RawDossier.
addFile(fsPath, barPath [, options] callback)
fsPath
The filesystem path where the file is located.
barPath
The name associated with the file entry inside the RawDossier.
options
| Optional
An object that allows to set whether the file is encrypted or not through the property encrypt
.
If encrypt
is set to false
then the added file is not encrypted.
If encrypt
is set to true
then the added file is encrypted.
It also allows to specify whether the file is added in the current RawDossier or in a RawDossier mounted in
the current RawDossier, through the property ignoreMounts
.
If ignoreMounts
is set to false
then the file is added in the current RawDossier.
If ignoreMounts
is set to true
then the file can be added in any RawDossier from the
tree that has as its root the current RawDossier.
If the options
argument is missing then, by default, the file is encrypted and added in the current RawDossier.
callback
The function called when the file has been added to the RawDossier.
It receives an error and the RawDossier's hash.
The addFile()
method reads the file at the specified path, breaks it into bricks and adds
an entry inside the RawDossier's barmap where bricks' hashes are kept. The hashes are used to locate the bricks inside EDFS.
In the following example the file "/home/foo/bar.js" is added to the RawDossier under the entry "bar".
The callback receives the RawDossier's hash.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.addFile("/home/foo/bar.js", "bar", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
});
The extractFile()
extracts a file from a RawDossier to a specified location.
extractFile(fsPath, barPath, callback)
fsPath
The filesystem path where the extracted file is located.
barPath
The path inside the RawDossier where the file's brick references are stored.
callback
The function when the extraction process is completed.
The extractFile()
method reads all the brick whose references are kept inside the RawDossier at the path
barPath
and combines them in order to obtain the file stored at fsPath
.
In the following example the file stored inside the RawDossier under the name "bar" is extracted at path "/home/foo/bar.js".
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.addfile("/home/foo/bar.js", "bar", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
rawDossier.extractFile("/home/foo/bar.js", "bar", (err) => {
if (err) {
throw err;
}
console.log("Successfully extracted");
});
});
The writeFile()
method writes the given data in a RawDossier.
writeFile(barPath, data [, options], callback)
barPath
The RawDossier entry were the data is written.
data
The data added to the RawDossier.
options
| Optional
An object that allows to set whether the data is encrypted or not through the property encrypt
.
If encrypt
is set to false
then the added data is not encrypted.
If encrypt
is set to true
then the added data is encrypted.
It also allows to specify whether the data is added in the current RawDossier or in a RawDossier mounted in
the current RawDossier, through the property ignoreMounts
.
If ignoreMounts
is set to false
then the data is added in the current RawDossier.
If ignoreMounts
is set to true
then the data can be added in any RawDossier from the
tree that has as its root the current RawDossier.
If the options
argument is missing then, by default, the data is encrypted and added in the current RawDossier.
callback
The function called when the data is added to the RawDossier.
The writeFile() breaks the given data into bricks whose references are kept at the specified path inside the RawDossier.
In the following example the data "content" is added to RawDossier under the entry "bar". The callback receives the RawDossier's hash.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.writeFile("bar", "content", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
});
The readFile()
reads the data written in a RawDossier at a specific path.
readFile(barPath, callback)
barPath
The RawDossier path from were the data is read.
callback
The function called when the data is added to the RawDossier. It receives an error and the read data.
The readFile()
reads the bricks at a specified entry inside the RawDossier and returns the data that was split in order to form the bricks.
In the following example the data stored at path "bar" inside the RawDossier is read and returned through the callback.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.writeFile("bar", "content", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
rawDossier.readFile("bar", (err, readData) => {
if (err) {
throw err;
}
console.log("This is the data", readData);
});
});
The listFiles()
returns the names of all the files stored inside a RawDossier at a specific path.
listFiles(barPath, callback)
barPath
The RawDossier path from where the file names are read.
callback
The function called when the file names have been read. It receives an error and the list of files.
The listFiles()
traverses the specified path inside the RawDossier and returns the names of all the files
stored at the specified path.
In the following example the filenames stored inside the RawDossier at path "bar" are returned through the provided callback.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.addFolder("/home/foo/bar", "bar", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
rawDossier.listFiles( "bar", (err, fileNames) => {
if (err) {
throw err;
}
console.log("These are the files", fileNames);
});
});
The listFolders()
returns the names of all the folders stored inside a RawDossier at a specific path.
listFolders(barPath, callback)
barPath
The archive path from where the folder names are read.
callback
The function called when the folder names have been read. It receives an error and the list of folders.
The listFolders()
traverses the specified path inside the RawDossier and returns the names of all the files
stored at the specified path.
In the following example the folders stored inside the RawDossier at path "/" are returned through the provided callback.
const EDFS = require("edfs");
const endpoint = "http://<IP_ADDRESS>:8080";
const edfs = EDFS.attachToEndpoint(endpoint);
const rawDossier = edfs.createRawDossier();
rawDossier.addFolder("/home/foo/bar", "/bar", (err, archiveDigest) => {
if (err) {
throw err;
}
rawDossier.addFolder("/home/foo", "/foo", (err, archiveDigest) => {
if (err) {
throw err;
}
console.log("This is the dossier's hash", archiveDigest);
rawDossier.listFolders( "/", (err, folders) => {
if (err) {
throw err;
}
console.log("These are the folders", folders);
});
});
});


HC disposes of plea against public examination
by Staff ReporterMADURAI
The Madurai Bench of the Madras High Court on Wednesday disposed of a public interest litigation petition that challenged the government order passed by the School Education department to conduct public examination for class V and VIII.
The petitioner, V. Rajendran of Pattukottai, a retired teacher, said that the introduction of public examination for class V and VIII would cause unnecessary burden on students. He said that experts should have been consulted before passing the G.O.
A Division Bench of Justices T.S. Sivagnanam and R. Tharani observed that the petitioner had only relied on newspaper reports. He should carry out an independent research and establish due credentials. Disposing of the petition, the court said that the petitioner was at liberty to carry out a research and submit a representation to the State in this regard.


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Tinder helps Match swipe right on revenue, user adds
Tinder-owner Match Group Inc beat Wall Street estimates for third-quarter revenue on Tuesday, as more users signed up on its online dating platforms.
REUTERS: Tinder-owner Match Group Inc beat Wall Street estimates for third-quarter revenue on Tuesday, as more users signed up on its online dating platforms.
The owner of OkCupid and PlentyOfFish said average subscribers at September-end rose 19per cent to 9.6 million from a year ago, including a rise of about 29per cent subscribers in its international markets.
Tinder — which has made "swipe left" and "swipe right" a point of pop culture conversations - added 437,000 average subscribers in the quarter bringing its total average subscriber count to 5.7 million.
The results come at a time when Match faces stiff competition from rivals, including Facebook Inc's recently launched dating service in the United States, and amidst a U.S. Federal Trade Commission complaint related to the company's certain marketing-related claims.
Last month, parent IAC/InterActiveCorp said it intends to spin off its ownership stake in Match Group resulting in the full separation of the two companies.
Match on Tuesday said it expects spin-off related expense to be about US$10 million in fiscal 2020.
To fend off competition, the company has boosted its marketing spend on its money-spinner Tinder in emerging markets, including India and Latin America, as well as its other dating services, PlentyOfFish and Hinge.
Match's total operating expenses rose about 20per cent to US$364.9 million in the quarter.
Total revenue rose 22per cent to US$541.5 million in the third quarter, edging past analysts' estimates of about US$540.6 million, according to IBES data from Refinitiv.
However, for the current quarter the company expects total revenue between US$545 million and US$555 million, below analysts' estimate of US$559.3 million, according to IBES data from Refinitiv.
The company's net earnings attributable to Match Group shareholders rose to US$151.5 million, or 51 cents per share, for the three months ended Sept. 30, from US$130.2 million, or 44 cents per share, a year earlier.
(Reporting by Ayanti Bera in Bengaluru; Editing by Shailesh Kuber)