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<title>TaskProcessor - Cesium Documentation</title>
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TaskProcessor
<div class="titleCenterer"></div>
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<section>
<header>
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<article>
<div class="container-overview">
<div class="nameContainer">
<h4 class="name" id="TaskProcessor">
<a href="#TaskProcessor" class="doc-link"></a>
new Cesium.TaskProcessor<span class="signature">(workerPath, <span class="optional">maximumActiveTasks</span>)</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TaskProcessor.js#L203">Core/TaskProcessor.js 203</a>
</div>
</h4>
</div>
<div class="description">
A wrapper around a web worker that allows scheduling tasks for a given worker,
returning results asynchronously via a promise.
The Worker is not constructed until a task is scheduled.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>workerPath</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="default">
</td>
<td class="description last">
The Url to the worker. This can either be an absolute path or relative to the Cesium Workers folder.</td>
</tr>
<tr>
<td class="name"><code>maximumActiveTasks</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
<code class="language-javascript">Number.POSITIVE_INFINITY</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The maximum number of active tasks. Once exceeded,
scheduleTask will not queue any more tasks, allowing
work to be rescheduled in future frames.</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<div class="nameContainer">
<h4 class="name" id="destroy">
<a href="#destroy" class="doc-link"></a>
destroy<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TaskProcessor.js#L352">Core/TaskProcessor.js 352</a>
</div>
</h4>
</div>
<div class="description">
Destroys this object. This will immediately terminate the Worker.
<br /><br />
Once an object is destroyed, it should not be used; calling any function other than
<code>isDestroyed</code> will result in a <a href="DeveloperError.html"><code>DeveloperError</code></a> exception.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="initWebAssemblyModule">
<a href="#initWebAssemblyModule" class="doc-link"></a>
initWebAssemblyModule<span class="signature">(<span class="optional">webAssemblyOptions</span>)</span> &rarr; <span class="type-signature returnType">Promise.&lt;Object></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TaskProcessor.js#L296">Core/TaskProcessor.js 296</a>
</div>
</h4>
</div>
<div class="description">
Posts a message to a web worker with configuration to initialize loading
and compiling a web assembly module asychronously, as well as an optional
fallback JavaScript module to use if Web Assembly is not supported.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>webAssemblyOptions</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<span class="optional">optional</span>
An object with the following properties:
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>modulePath</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">
<span class="optional">optional</span>
The path of the web assembly JavaScript wrapper module.</td>
</tr>
<tr>
<td class="name"><code>wasmBinaryFile</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">
<span class="optional">optional</span>
The path of the web assembly binary file.</td>
</tr>
<tr>
<td class="name"><code>fallbackModulePath</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">
<span class="optional">optional</span>
The path of the fallback JavaScript module to use if web assembly is not supported.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
A promise that resolves to the result when the web worker has loaded and compiled the web assembly module and is ready to process tasks.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="isDestroyed">
<a href="#isDestroyed" class="doc-link"></a>
isDestroyed<span class="signature">()</span> &rarr; <span class="type-signature returnType">Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TaskProcessor.js#L342">Core/TaskProcessor.js 342</a>
</div>
</h4>
</div>
<div class="description">
Returns true if this object was destroyed; otherwise, false.
<br /><br />
If this object was destroyed, it should not be used; calling any function other than
<code>isDestroyed</code> will result in a <a href="DeveloperError.html"><code>DeveloperError</code></a> exception.
</div>
<h5>Returns:</h5>
<div class="param-desc">
True if this object was destroyed; otherwise, false.
</div>
<dl class="details">
<h5>See:</h5>
<ul class="see-list">
<li><a href="TaskProcessor.html#destroy">TaskProcessor#destroy</a></li>
</ul>
</dl>
<div class="nameContainer">
<h4 class="name" id="scheduleTask">
<a href="#scheduleTask" class="doc-link"></a>
scheduleTask<span class="signature">(parameters, <span class="optional">transferableObjects</span>)</span> &rarr; <span class="type-signature returnType">Promise.&lt;Object>|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TaskProcessor.js#L246">Core/TaskProcessor.js 246</a>
</div>
</h4>
</div>
<div class="description">
Schedule a task to be processed by the web worker asynchronously. If there are currently more
tasks active than the maximum set by the constructor, will immediately return undefined.
Otherwise, returns a promise that will resolve to the result posted back by the worker when
finished.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>parameters</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
Any input data that will be posted to the worker.</td>
</tr>
<tr>
<td class="name"><code>transferableObjects</code></td>
<td class="type">
<span class="param-type">Array.&lt;Object></span>
</td>
<td class="description last">
<span class="optional">optional</span>
An array of objects contained in parameters that should be
transferred to the worker instead of copied.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
Either a promise that will resolve to the result when available, or undefined
if there are too many active tasks,
</div>
<dl class="details">
<h5>Example:</h5>
<pre><code class="language-javascript">const taskProcessor = new Cesium.TaskProcessor('myWorkerPath');
const promise = taskProcessor.scheduleTask({
someParameter : true,
another : 'hello'
});
if (!Cesium.defined(promise)) {
// too many active tasks - try again later
} else {
Cesium.when(promise, function(result) {
// use the result of the task
});
}</code></pre>
</dl>
</article>
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