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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.eclipse.jetty.util.thread</a></div>
<h2 title="Class ReservedThreadExecutor" class="title">Class ReservedThreadExecutor</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li><a href="../component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">org.eclipse.jetty.util.component.AbstractLifeCycle</a></li>
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<li>org.eclipse.jetty.util.thread.ReservedThreadExecutor</li>
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<dt>All Implemented Interfaces:</dt>
<dd><code>java.util.concurrent.Executor</code>, <code><a href="../component/LifeCycle.html" title="interface in org.eclipse.jetty.util.component">LifeCycle</a></code>, <code><a href="TryExecutor.html" title="interface in org.eclipse.jetty.util.thread">TryExecutor</a></code></dd>
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<pre><a href="../annotation/ManagedObject.html" title="annotation in org.eclipse.jetty.util.annotation">@ManagedObject</a>("A pool for reserved threads")
public class <span class="typeNameLabel">ReservedThreadExecutor</span>
extends <a href="../component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a>
implements <a href="TryExecutor.html" title="interface in org.eclipse.jetty.util.thread">TryExecutor</a></pre>
<div class="block">An Executor using preallocated/reserved Threads from a wrapped Executor.
<p>Calls to <a href="#execute(java.lang.Runnable)"><code>execute(Runnable)</code></a> on a <a href="ReservedThreadExecutor.html" title="class in org.eclipse.jetty.util.thread"><code>ReservedThreadExecutor</code></a> will either succeed
with a Thread immediately being assigned the Runnable task, or fail if no Thread is
available.
<p>Threads are reserved lazily, with a new reserved thread being allocated from a
wrapped <code>Executor</code> when an execution fails. If the <a href="#setIdleTimeout(long,java.util.concurrent.TimeUnit)"><code>setIdleTimeout(long, TimeUnit)</code></a>
is set to non zero (default 1 minute), then the reserved thread pool will shrink by 1 thread
whenever it has been idle for that period.</div>
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<code><a href="../component/AbstractLifeCycle.AbstractLifeCycleListener.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle.AbstractLifeCycleListener</a></code></li>
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<code><a href="../component/LifeCycle.Listener.html" title="interface in org.eclipse.jetty.util.component">LifeCycle.Listener</a></code></li>
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<code><a href="TryExecutor.NoTryExecutor.html" title="class in org.eclipse.jetty.util.thread">TryExecutor.NoTryExecutor</a></code></li>
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<code><a href="../component/AbstractLifeCycle.html#FAILED">FAILED</a>, <a href="../component/AbstractLifeCycle.html#RUNNING">RUNNING</a>, <a href="../component/AbstractLifeCycle.html#STARTED">STARTED</a>, <a href="../component/AbstractLifeCycle.html#STARTING">STARTING</a>, <a href="../component/AbstractLifeCycle.html#STOPPED">STOPPED</a>, <a href="../component/AbstractLifeCycle.html#STOPPING">STOPPING</a></code></li>
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<code><a href="TryExecutor.html#NO_TRY">NO_TRY</a></code></li>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<tr class="altColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.concurrent.Executor,int)">ReservedThreadExecutor</a></span>&#8203;(java.util.concurrent.Executor&nbsp;executor,
int&nbsp;capacity)</code></th>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doStart()">doStart</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doStop()">doStop</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#execute(java.lang.Runnable)">execute</a></span>&#8203;(java.lang.Runnable&nbsp;task)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getAvailable()">getAvailable</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCapacity()">getCapacity</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>java.util.concurrent.Executor</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getExecutor()">getExecutor</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getIdleTimeoutMs()">getIdleTimeoutMs</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPending()">getPending</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setIdleTimeout(long,java.util.concurrent.TimeUnit)">setIdleTimeout</a></span>&#8203;(long&nbsp;idleTime,
java.util.concurrent.TimeUnit&nbsp;idleTimeUnit)</code></th>
<td class="colLast">
<div class="block">Set the idle timeout for shrinking the reserved thread pool</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#tryExecute(java.lang.Runnable)">tryExecute</a></span>&#8203;(java.lang.Runnable&nbsp;task)</code></th>
<td class="colLast">
<div class="block">Attempt to execute a task.</div>
</td>
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<h3>Methods inherited from class&nbsp;org.eclipse.jetty.util.component.<a href="../component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></h3>
<code><a href="../component/AbstractLifeCycle.html#addLifeCycleListener(org.eclipse.jetty.util.component.LifeCycle.Listener)">addLifeCycleListener</a>, <a href="../component/AbstractLifeCycle.html#getState()">getState</a>, <a href="../component/AbstractLifeCycle.html#getState(org.eclipse.jetty.util.component.LifeCycle)">getState</a>, <a href="../component/AbstractLifeCycle.html#getStopTimeout()">getStopTimeout</a>, <a href="../component/AbstractLifeCycle.html#isFailed()">isFailed</a>, <a href="../component/AbstractLifeCycle.html#isRunning()">isRunning</a>, <a href="../component/AbstractLifeCycle.html#isStarted()">isStarted</a>, <a href="../component/AbstractLifeCycle.html#isStarting()">isStarting</a>, <a href="../component/AbstractLifeCycle.html#isStopped()">isStopped</a>, <a href="../component/AbstractLifeCycle.html#isStopping()">isStopping</a>, <a href="../component/AbstractLifeCycle.html#removeLifeCycleListener(org.eclipse.jetty.util.component.LifeCycle.Listener)">removeLifeCycleListener</a>, <a href="../component/AbstractLifeCycle.html#setStopTimeout(long)">setStopTimeout</a>, <a href="../component/AbstractLifeCycle.html#start()">start</a>, <a href="../component/AbstractLifeCycle.html#stop()">stop</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>ReservedThreadExecutor</h4>
<pre>public&nbsp;ReservedThreadExecutor&#8203;(java.util.concurrent.Executor&nbsp;executor,
int&nbsp;capacity)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>executor</code> - The executor to use to obtain threads</dd>
<dd><code>capacity</code> - The number of threads to preallocate. If less than 0 then capacity
is calculated based on a heuristic from the number of available processors and
thread pool size.</dd>
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<a id="getExecutor()">
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<h4>getExecutor</h4>
<pre class="methodSignature">public&nbsp;java.util.concurrent.Executor&nbsp;getExecutor()</pre>
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<a id="getCapacity()">
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<h4>getCapacity</h4>
<pre class="methodSignature"><a href="../annotation/ManagedAttribute.html" title="annotation in org.eclipse.jetty.util.annotation">@ManagedAttribute</a>(<a href="../annotation/ManagedAttribute.html#value()">value</a>="max number of reserved threads",
<a href="../annotation/ManagedAttribute.html#readonly()">readonly</a>=true)
public&nbsp;int&nbsp;getCapacity()</pre>
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<h4>getAvailable</h4>
<pre class="methodSignature"><a href="../annotation/ManagedAttribute.html" title="annotation in org.eclipse.jetty.util.annotation">@ManagedAttribute</a>(<a href="../annotation/ManagedAttribute.html#value()">value</a>="available reserved threads",
<a href="../annotation/ManagedAttribute.html#readonly()">readonly</a>=true)
public&nbsp;int&nbsp;getAvailable()</pre>
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<h4>getPending</h4>
<pre class="methodSignature"><a href="../annotation/ManagedAttribute.html" title="annotation in org.eclipse.jetty.util.annotation">@ManagedAttribute</a>(<a href="../annotation/ManagedAttribute.html#value()">value</a>="pending reserved threads",
<a href="../annotation/ManagedAttribute.html#readonly()">readonly</a>=true)
public&nbsp;int&nbsp;getPending()</pre>
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<h4>getIdleTimeoutMs</h4>
<pre class="methodSignature"><a href="../annotation/ManagedAttribute.html" title="annotation in org.eclipse.jetty.util.annotation">@ManagedAttribute</a>(<a href="../annotation/ManagedAttribute.html#value()">value</a>="idletimeout in MS",
<a href="../annotation/ManagedAttribute.html#readonly()">readonly</a>=true)
public&nbsp;long&nbsp;getIdleTimeoutMs()</pre>
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<a id="setIdleTimeout(long,java.util.concurrent.TimeUnit)">
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<h4>setIdleTimeout</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;setIdleTimeout&#8203;(long&nbsp;idleTime,
java.util.concurrent.TimeUnit&nbsp;idleTimeUnit)</pre>
<div class="block">Set the idle timeout for shrinking the reserved thread pool</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>idleTime</code> - Time to wait before shrinking, or 0 for no timeout.</dd>
<dd><code>idleTimeUnit</code> - Time units for idle timeout</dd>
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<h4>doStart</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;doStart()
throws java.lang.Exception</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../component/AbstractLifeCycle.html#doStart()">doStart</a></code>&nbsp;in class&nbsp;<code><a href="../component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd>
</dl>
</li>
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<h4>doStop</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;doStop()
throws java.lang.Exception</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../component/AbstractLifeCycle.html#doStop()">doStop</a></code>&nbsp;in class&nbsp;<code><a href="../component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.Exception</code></dd>
</dl>
</li>
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<a id="execute(java.lang.Runnable)">
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<h4>execute</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;execute&#8203;(java.lang.Runnable&nbsp;task)
throws java.util.concurrent.RejectedExecutionException</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>execute</code>&nbsp;in interface&nbsp;<code>java.util.concurrent.Executor</code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TryExecutor.html#execute(java.lang.Runnable)">execute</a></code>&nbsp;in interface&nbsp;<code><a href="TryExecutor.html" title="interface in org.eclipse.jetty.util.thread">TryExecutor</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.util.concurrent.RejectedExecutionException</code></dd>
</dl>
</li>
</ul>
<a id="tryExecute(java.lang.Runnable)">
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<h4>tryExecute</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;tryExecute&#8203;(java.lang.Runnable&nbsp;task)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="TryExecutor.html#tryExecute(java.lang.Runnable)">TryExecutor</a></code></span></div>
<div class="block">Attempt to execute a task.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TryExecutor.html#tryExecute(java.lang.Runnable)">tryExecute</a></code>&nbsp;in interface&nbsp;<code><a href="TryExecutor.html" title="interface in org.eclipse.jetty.util.thread">TryExecutor</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>task</code> - The task to run</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>True iff a reserved thread was available and has been assigned the task to run.</dd>
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<h4>toString</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;toString()</pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../component/AbstractLifeCycle.html#toString()">toString</a></code>&nbsp;in class&nbsp;<code><a href="../component/AbstractLifeCycle.html" title="class in org.eclipse.jetty.util.component">AbstractLifeCycle</a></code></dd>
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