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<h1 class="page-title">CentralDispatch</h1>
<section>
<header>
<h2>
CentralDispatch
</h2>
<div class="class-description"><p>This class serves as the central broker for message dispatch. It expects to operate on the main thread / Window and
it must be informed of any Worker threads which will participate in the messaging system. From any context in the
messaging system, the dispatcher's &quot;call&quot; method can call any method on any &quot;service&quot; provided in any participating
context. The dispatch system will forward function arguments and return values across worker boundaries as needed.</p></div>
</header>
<article>
<div class="container-overview">
<h2>Constructor</h2>
<h4 class="name" id="CentralDispatch"><span class="type-signature"></span>new CentralDispatch<span class="signature">()</span><span class="type-signature"></span></h4>
<dl class="details">
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li>{<a href="WorkerDispatch.html">WorkerDispatch</a>}</li>
</ul>
</dd>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<h4 class="name" id="services"><span class="type-signature"></span>services<span class="type-signature"> :object.&lt;(Worker|object)></span></h4>
<dl class="details">
<dt class="tag-see">See:</dt>
<dd class="tag-see">
<ul>
<li>{setService}</li>
</ul>
</dd>
</dl>
<div class="description">
<p>Map of channel name to worker or local service provider.
If the entry is a Worker, the service is provided by an object on that worker.
Otherwise, the service is provided locally and methods on the service will be called directly.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">object.&lt;(Worker|object)></span>
</li>
</ul>
<h4 class="name" id="workerClass"><span class="type-signature"></span>workerClass<span class="type-signature"> :function</span></h4>
<dl class="details">
</dl>
<div class="description">
<p>The constructor we will use to recognize workers.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">function</span>
</li>
</ul>
<h4 class="name" id="workers"><span class="type-signature"></span>workers<span class="type-signature"> :Array</span></h4>
<dl class="details">
</dl>
<div class="description">
<p>List of workers attached to this dispatcher.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Array</span>
</li>
</ul>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="_getServiceProvider"><span class="type-signature">(protected) </span>_getServiceProvider<span class="signature">(service)</span><span class="type-signature"> &rarr; {Object}</span></h4>
<dl class="details">
</dl>
<div class="description">
<p>Fetch the service provider object for a particular service name.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>service</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>the name of the service to look up</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
<ul>
<li>the means to contact the service, if found</li>
</ul>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Object</span>
</dd>
</dl>
<h4 class="name" id="_onDispatchMessage"><span class="type-signature">(protected) </span>_onDispatchMessage<span class="signature">(worker, message)</span><span class="type-signature"> &rarr; {Promise|undefined}</span></h4>
<dl class="details">
</dl>
<div class="description">
<p>Handle a call message sent to the dispatch service itself</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>worker</code></td>
<td class="type">
<span class="param-type">Worker</span>
</td>
<td class="description last"><p>the worker which sent the message.</p></td>
</tr>
<tr>
<td class="name"><code>message</code></td>
<td class="type">
<span class="param-type"><a href="global.html#DispatchCallMessage">DispatchCallMessage</a></span>
</td>
<td class="description last"><p>the message to be handled.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
<ul>
<li>a promise for the results of this operation, if appropriate</li>
</ul>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Promise</span>
|
<span class="param-type">undefined</span>
</dd>
</dl>
<h4 class="name" id="addWorker"><span class="type-signature"></span>addWorker<span class="signature">(worker)</span><span class="type-signature"></span></h4>
<dl class="details">
</dl>
<div class="description">
<p>Add a worker to the message dispatch system. The worker must implement a compatible message dispatch framework.
The dispatcher will immediately attempt to &quot;handshake&quot; with the worker.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>worker</code></td>
<td class="type">
<span class="param-type">Worker</span>
</td>
<td class="description last"><p>the worker to add into the dispatch system.</p></td>
</tr>
</tbody>
</table>
<h4 class="name" id="callSync"><span class="type-signature"></span>callSync<span class="signature">(service, method, &hellip;args<span class="signature-attributes">opt</span>)</span><span class="type-signature"> &rarr; {*}</span></h4>
<dl class="details">
</dl>
<div class="description">
<p>Synchronously call a particular method on a particular service provided locally.
Calling this function on a remote service will fail.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>service</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="attributes">
</td>
<td class="description last"><p>the name of the service.</p></td>
</tr>
<tr>
<td class="name"><code>method</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="attributes">
</td>
<td class="description last"><p>the name of the method.</p></td>
</tr>
<tr>
<td class="name"><code>args</code></td>
<td class="type">
<span class="param-type">*</span>
</td>
<td class="attributes">
&lt;optional><br>
&lt;repeatable><br>
</td>
<td class="description last"><p>the arguments to be copied to the method, if any.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
<ul>
<li>the return value of the service method.</li>
</ul>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">*</span>
</dd>
</dl>
<h4 class="name" id="setService"><span class="type-signature"></span>setService<span class="signature">(service, provider)</span><span class="type-signature"> &rarr; {Promise}</span></h4>
<dl class="details">
</dl>
<div class="description">
<p>Set a local object as the global provider of the specified service.
WARNING: Any method on the provider can be called from any worker within the dispatch system.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>service</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>a globally unique string identifying this service. Examples: 'vm', 'gui', 'extension9'.</p></td>
</tr>
<tr>
<td class="name"><code>provider</code></td>
<td class="type">
<span class="param-type">object</span>
</td>
<td class="description last"><p>a local object which provides this service.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
<ul>
<li>a promise which will resolve once the service is registered.</li>
</ul>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Promise</span>
</dd>
</dl>
<h4 class="name" id="setServiceSync"><span class="type-signature"></span>setServiceSync<span class="signature">(service, provider)</span><span class="type-signature"></span></h4>
<dl class="details">
</dl>
<div class="description">
<p>Synchronously set a local object as the global provider of the specified service.
WARNING: Any method on the provider can be called from any worker within the dispatch system.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>service</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>a globally unique string identifying this service. Examples: 'vm', 'gui', 'extension9'.</p></td>
</tr>
<tr>
<td class="name"><code>provider</code></td>
<td class="type">
<span class="param-type">object</span>
</td>
<td class="description last"><p>a local object which provides this service.</p></td>
</tr>
</tbody>
</table>
</article>
</section>
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