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Update README.md to note deprecation
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[![Build Status](https://travis-ci.org/C2FO/werker.png?branch=master)](https://travis-ci.org/C2FO/werker)

#Werker
# :warning:

`werker` is a module that helps in the managing and using of worker processes in node, letting you focus on getting things done.

`werker` is useful if you have CPU intensive tasks that block your node process from doing handling other tasks you can easily push it off to a worker process and let `werker` manage it.
This project is deprecated and no longer accepting contributions

[Here](http://screenr.com/mkM7) is a brief screen cast showing `werker` managing a pool of processes.
# Werker

Notice how once the request stop `werker` automatically cleans up processes. The code for the screen cast is in the examples directory and at the bottom of this page.
`werker` is a module that helps in the managing and using of worker processes in node, letting you focus on getting things done.

`werker` is useful if you have CPU intensive tasks that block your node process from doing handling other tasks you can easily push it off to a worker process and let `werker` manage it.

##Installation
## Installation

`npm install werker`

##Usage
## Usage

###Writing a `worker`
### Writing a `worker`

The `werker` API has two aspects to it, the `worker` API and the `pool` API. In order to create a worker pool lets create a worker!

**`worker()`**

The entry point to writing a worker the `worker` function which returns a worker builder that allows you to define messages that your worker accepts from the parent process.

```
```js
var werker = require("werker");

var worker = werker.worker();
Expand All @@ -43,7 +42,7 @@ module.exports = worker;

Ok that is the base for all `worker`s in worker, but right now it doesnt do anything so lets add some handlers to our worker.

```
```js
worker.method("sayHello", function () {
return "Hello World!";
});
Expand All @@ -53,7 +52,7 @@ So in the above scode snippet we added a `method` to our worker which says whene

Well thats great but my code is async! Well we have a solution for that also!

```
```js
worker.method("sayHelloAsync", function (cb) {
process.nextTick(function(){
cb(null, "Hello World!");
Expand All @@ -67,7 +66,7 @@ Ok so notice how we passed in true as the last argument to the `method` method s

You can also specify a group of methods when creating your worker.

```
```js
worker.methods({
sayHello : function sayHello(){
return "Hello World!";
Expand All @@ -83,7 +82,7 @@ So in the above snippet we define two methods `sayHello` and `add`.

You can also pass in true as the last argument to make the group of methods async

```
```js
worker.methods({
sayHelloAsync : function sayHello(cb){
process.nextTick(function(){
Expand All @@ -97,27 +96,24 @@ worker.methods({
});
}
}, true);
```

**`worker.handler(fn, async?)`**

Well I just want a default handler similar to `process.on("message")` ok to do that you can create a default handler that handles all methods that do not match any methods invoked.

```
```js
worker.handler(function(message){
//do something with your message
});
```

Or alternatively the async version.

```
```js
worker.handler(function(message, done){
//do something with your message
}, true);
```

In the above snippets message will be whatever arguments that are passed into the handler, which we will see in the pool.
Expand All @@ -126,7 +122,7 @@ In the above snippets message will be whatever arguments that are passed into th

If you have logic that you need to run before your worker is stopped either by the pool or the stop method you can specify a tear down function to run.

```
```js
worker.tearDown(function(){
console.log("tear down");
});
Expand All @@ -137,18 +133,17 @@ worker.tearDown(function(){

To start your worker (i.e. ensure that it is listening and routing messages) use the `start` method.

```
```js
worker.start(); //now your worker is listening for incoming messages and routing to your messages
```

**`worker.stop()`**

To stop your worker from listening to incoming messages use the `stop()` method.

###All Together
### All Together

```
```js
var werker = require("werker");


Expand All @@ -167,18 +162,17 @@ module.exports = werker.worker()
.tearDown(function(){
console.log("tear down");
}).start();
```

###Creating a Pool
### Creating a Pool

Ok so we have created a worker so lets create a pool to use our worker with.

**werker.pool(pathToWorker)**

To create a pool use the `werker.pool` method.

```
```js
var werker = require("werker");

var werkers = werker.pool(__dirname + "/myWorker.js");
Expand All @@ -188,7 +182,7 @@ var werkers = werker.pool(__dirname + "/myWorker.js");

Ok so you setup your pool but you dont want all your workers sitting around forever, so you can specify a `ttl` on your worker. This will ensure that the pool cleans up any workers that have not been used for the `ttl` limit.

```
```js
werkers.ttl(10000);
```

Expand All @@ -201,15 +195,15 @@ So now our workers will sit around for a max time of `10` seconds.
By default `werker` will allow up to `10` worker processes if you wish to increase/lower this limit use the `max` method.


```
```js
werkers.max(100); //now I can get up to 100 workers
```

**`pool.workerArgs(workerArguments)`**

The `werker` pool lets specify arguments to pass to the `worker` process when forking a new one.

```
```js
pool.workerArgs(["hello", "world"]);
```

Expand All @@ -219,12 +213,11 @@ You can access the arguments by using `process.argv` in the worker.

By defualt the only option set on a `worker` when forking is the `env` which is set to the current processes env. You can override this by using the `workerOptions` method. For more options click [here](http://nodejs.org/api/child_process.html#child_process_child_process_fork_modulepath_args_options).

###Getting a worker.
### Getting a worker.

This is where `werker` is different just managing your worker processes manually. `werker` manages the creation/destryoing of worker processes internally allowing you to focus on the task at hand.

```
```js
var myWorker = werkers.worker();

myWorker.sayHello(function(err, response){
Expand All @@ -243,13 +236,13 @@ myWorker.sayHello().then(function(response){



##Example
## Example

So lets create a web server that returns fibonacci numbers.

The worker

```
```js
var werker = require("werker");

function fibonacci(n) {
Expand All @@ -264,7 +257,7 @@ module.exports = werker.worker()

The server.

```
```js
var http = require("http"),
werker = require("werker"),
url = require('url');
Expand All @@ -287,10 +280,9 @@ http.createServer(function (req, res) {

}).listen(3000, "127.0.0.1");
```
The video at the top is a demonstration of this sample code.

##Meta
## Meta

Code: `git clone git://github.com/C2FO/werker.git`
JsDoc: <http://c2fo.github.com/werker>
JsDoc: <http://c2fo.github.io/werker>
Website: <http://c2fo.com> - Twitter: <http://twitter.com/c2fo> - 877.465.4045

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