concern
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A library for seperating your application logic into concerns.
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<title>JSDoc: Source: node/ChildReferenceProvider.js</title>
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<h1 class="page-title">Source: node/ChildReferenceProvider.js</h1>
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<pre class="prettyprint source linenums"><code>import ChildProcess from 'child_process';
import beof from 'beof';
import Address from '../Address';
import RefState from '../RefState';
import Concern from '../Concern';
import ChildStateProvider from './ChildStateProvider';
import ChildReference from './ChildReference';
import SpawnChildProcessError from './SpawnChildProcessError';
import StateProvider from '../StateProvider';
/**
* ChildReferenceProvider provides a Reference for a Concern
* running on a child process.
* @implements {ReferenceProvider}
*/
class ChildReferenceProvider {
constructor() {
this._cache = {};
this._list = {};
}
/**
* getProcessList returns a map of child process
* created by this provider.
* @return {object}
*/
getProcessList() {
return this._list;
}
select(path, context) {
var addr = Address.fromString(path);
var concern = new Concern();
var child;
var provider;
if (this._cache.hasOwnProperty(path))
return this._cache[path];
//@todo move to validator class
if (typeof addr.uri.hash !== 'string')
throw new ReferenceError('A child process uri must have a path and hash part!');
if (this._list.hasOwnProperty(addr.uri.path)) {
child = this._list[addr.uri.path];
} else {
try {
child = ChildProcess.fork(addr.uri.path);
this._list[addr.uri.path] = child;
} catch (e) {
context.publish(new SpawnChildProcessError(e));
return new Reference(new RefState.UnknownState(
path, concern, context, new StateProvider()));
}
}
provider = new ChildStateProvider(path, addr.uri.hash.substring(1), child);
return this._cache[path] = new ChildReference(
provider.provide(RefState.ACTIVE_STATE, concern, context),
path, addr.uri.hash.substring(1), concern, context, provider, child);
}
reselect(path, context) {
this._cache[path] = null;
return this.select(path, context);
}
}
export default ChildReferenceProvider
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="Active.html">Active</a></li><li><a href="Address.html">Address</a></li><li><a href="ChildActiveState.html">ChildActiveState</a></li><li><a href="ChildReference.html">ChildReference</a></li><li><a href="ChildReferenceProvider.html">ChildReferenceProvider</a></li><li><a href="ChildStateProvider.html">ChildStateProvider</a></li><li><a href="Envelope.html">Envelope</a></li><li><a href="IgnoredMessage.html">IgnoredMessage</a></li><li><a href="InvalidMessageError.html">InvalidMessageError</a></li><li><a href="MailDispatcher.html">MailDispatcher</a></li><li><a href="MemoryStateProvider.html">MemoryStateProvider</a></li><li><a href="ParentReference.html">ParentReference</a></li><li><a href="Pause.html">Pause</a></li><li><a href="Paused.html">Paused</a></li><li><a href="ProcessRouter.html">ProcessRouter</a></li><li><a href="Ready.html">Ready</a></li><li><a href="ReceiveError.html">ReceiveError</a></li><li><a href="Reference.html">Reference</a></li><li><a href="RefState.html">RefState</a></li><li><a href="RemoteMessage.html">RemoteMessage</a></li><li><a href="RemoteteTerminatedError.html">RemoteteTerminatedError</a></li><li><a href="Resume.html">Resume</a></li><li><a href="Signal.html">Signal</a></li><li><a href="SimpleMailBox.html">SimpleMailBox</a></li><li><a href="SpawnChildProcessError.html">SpawnChildProcessError</a></li><li><a href="Start.html">Start</a></li><li><a href="Stop.html">Stop</a></li><li><a href="Stopped.html">Stopped</a></li><li><a href="StoppedConcernError.html">StoppedConcernError</a></li><li><a href="System.html">System</a></li><li><a href="UnhandledMessage.html">UnhandledMessage</a></li><li><a href="Unknown.html">Unknown</a></li></ul><h3>Interfaces</h3><ul><li><a href="Concern.html">Concern</a></li><li><a href="Context.html">Context</a></li><li><a href="EnqueueListener.html">EnqueueListener</a></li><li><a href="MailBox.html">MailBox</a></li><li><a href="ReferenceProvider.html">ReferenceProvider</a></li><li><a href="StateProvider.html">StateProvider</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.0-dev</a> on Mon Sep 26 2016 02:55:49 GMT-0400 (AST)
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