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<div class="subTitle">edu.emory.mathcs.backport.java.util.concurrent</div>
<h2 title="Class Executors" class="title">Class Executors</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>edu.emory.mathcs.backport.java.util.concurrent.Executors</li>
</ul>
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<pre>public class <span class="strong">Executors</span>
extends java.lang.Object</pre>
<div class="block">Factory and utility methods for <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executor.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Executor</code></a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ExecutorService</code></a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ScheduledExecutorService</code></a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ThreadFactory</code></a>, and <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> classes defined in this
package. This class supports the following kinds of methods:
<ul>
<li> Methods that create and return an <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ExecutorService</code></a>
set up with commonly useful configuration settings.
<li> Methods that create and return a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ScheduledExecutorService</code></a>
set up with commonly useful configuration settings.
<li> Methods that create and return a "wrapped" ExecutorService, that
disables reconfiguration by making implementation-specific methods
inaccessible.
<li> Methods that create and return a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ThreadFactory</code></a>
that sets newly created threads to a known state.
<li> Methods that create and return a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a>
out of other closure-like forms, so they can be used
in execution methods requiring <tt>Callable</tt>.
</ul></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.5</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Doug Lea</dd></dl>
</li>
</ul>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#callable(java.security.PrivilegedAction)">callable</a></strong>(java.security.PrivilegedAction action)</code>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given privileged action and returns its result.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#callable(java.security.PrivilegedExceptionAction)">callable</a></strong>(java.security.PrivilegedExceptionAction action)</code>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given privileged exception action and returns
its result.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#callable(java.lang.Runnable)">callable</a></strong>(java.lang.Runnable task)</code>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given task and returns <tt>null</tt>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#callable(java.lang.Runnable, java.lang.Object)">callable</a></strong>(java.lang.Runnable task,
java.lang.Object result)</code>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given task and returns the given result.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#defaultThreadFactory()">defaultThreadFactory</a></strong>()</code>
<div class="block">Returns a default thread factory used to create new threads.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newCachedThreadPool()">newCachedThreadPool</a></strong>()</code>
<div class="block">Creates a thread pool that creates new threads as needed, but
will reuse previously constructed threads when they are
available.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newCachedThreadPool(edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory)">newCachedThreadPool</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</code>
<div class="block">Creates a thread pool that creates new threads as needed, but
will reuse previously constructed threads when they are
available, and uses the provided
ThreadFactory to create new threads when needed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newFixedThreadPool(int)">newFixedThreadPool</a></strong>(int nThreads)</code>
<div class="block">Creates a thread pool that reuses a fixed number of threads
operating off a shared unbounded queue.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newFixedThreadPool(int, edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory)">newFixedThreadPool</a></strong>(int nThreads,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</code>
<div class="block">Creates a thread pool that reuses a fixed number of threads
operating off a shared unbounded queue, using the provided
ThreadFactory to create new threads when needed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newScheduledThreadPool(int)">newScheduledThreadPool</a></strong>(int corePoolSize)</code>
<div class="block">Creates a thread pool that can schedule commands to run after a
given delay, or to execute periodically.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newScheduledThreadPool(int, edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory)">newScheduledThreadPool</a></strong>(int corePoolSize,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</code>
<div class="block">Creates a thread pool that can schedule commands to run after a
given delay, or to execute periodically.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newSingleThreadExecutor()">newSingleThreadExecutor</a></strong>()</code>
<div class="block">Creates an Executor that uses a single worker thread operating
off an unbounded queue.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newSingleThreadExecutor(edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory)">newSingleThreadExecutor</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</code>
<div class="block">Creates an Executor that uses a single worker thread operating
off an unbounded queue, and uses the provided ThreadFactory to
create a new thread when needed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newSingleThreadScheduledExecutor()">newSingleThreadScheduledExecutor</a></strong>()</code>
<div class="block">Creates a single-threaded executor that can schedule commands
to run after a given delay, or to execute periodically.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#newSingleThreadScheduledExecutor(edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory)">newSingleThreadScheduledExecutor</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</code>
<div class="block">Creates a single-threaded executor that can schedule commands
to run after a given delay, or to execute periodically.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#privilegedCallable(edu.emory.mathcs.backport.java.util.concurrent.Callable)">privilegedCallable</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable)</code>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that will, when
called, execute the given <tt>callable</tt> under the current
access control context.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#privilegedCallableUsingCurrentClassLoader(edu.emory.mathcs.backport.java.util.concurrent.Callable)">privilegedCallableUsingCurrentClassLoader</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable)</code>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that will, when
called, execute the given <tt>callable</tt> under the current
access control context, with the current context class loader
as the context class loader.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#privilegedThreadFactory()">privilegedThreadFactory</a></strong>()</code>
<div class="block">Returns a thread factory used to create new threads that
have the same permissions as the current thread.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#unconfigurableExecutorService(edu.emory.mathcs.backport.java.util.concurrent.ExecutorService)">unconfigurableExecutorService</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> executor)</code>
<div class="block">Returns an object that delegates all defined <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ExecutorService</code></a> methods to the given executor, but not any
other methods that might otherwise be accessible using
casts.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#unconfigurableScheduledExecutorService(edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService)">unconfigurableScheduledExecutorService</a></strong>(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> executor)</code>
<div class="block">Returns an object that delegates all defined <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ScheduledExecutorService</code></a> methods to the given executor, but
not any other methods that might otherwise be accessible using
casts.</div>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> newFixedThreadPool(int nThreads)</pre>
<div class="block">Creates a thread pool that reuses a fixed number of threads
operating off a shared unbounded queue. At any point, at most
<tt>nThreads</tt> threads will be active processing tasks.
If additional tasks are submitted when all threads are active,
they will wait in the queue until a thread is available.
If any thread terminates due to a failure during execution
prior to shutdown, a new one will take its place if needed to
execute subsequent tasks. The threads in the pool will exist
until it is explicitly <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#shutdown()"><code>shutdown</code></a>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>nThreads</code> - the number of threads in the pool</dd>
<dt><span class="strong">Returns:</span></dt><dd>the newly created thread pool</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if <tt>nThreads <= 0</tt></dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> newFixedThreadPool(int nThreads,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</pre>
<div class="block">Creates a thread pool that reuses a fixed number of threads
operating off a shared unbounded queue, using the provided
ThreadFactory to create new threads when needed. At any point,
at most <tt>nThreads</tt> threads will be active processing
tasks. If additional tasks are submitted when all threads are
active, they will wait in the queue until a thread is
available. If any thread terminates due to a failure during
execution prior to shutdown, a new one will take its place if
needed to execute subsequent tasks. The threads in the pool will
exist until it is explicitly <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#shutdown()"><code>shutdown</code></a>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>nThreads</code> - the number of threads in the pool</dd><dd><code>threadFactory</code> - the factory to use when creating new threads</dd>
<dt><span class="strong">Returns:</span></dt><dd>the newly created thread pool</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if threadFactory is null</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if <tt>nThreads <= 0</tt></dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> newSingleThreadExecutor()</pre>
<div class="block">Creates an Executor that uses a single worker thread operating
off an unbounded queue. (Note however that if this single
thread terminates due to a failure during execution prior to
shutdown, a new one will take its place if needed to execute
subsequent tasks.) Tasks are guaranteed to execute
sequentially, and no more than one task will be active at any
given time. Unlike the otherwise equivalent
<tt>newFixedThreadPool(1)</tt> the returned executor is
guaranteed not to be reconfigurable to use additional threads.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the newly created single-threaded Executor</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> newSingleThreadExecutor(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</pre>
<div class="block">Creates an Executor that uses a single worker thread operating
off an unbounded queue, and uses the provided ThreadFactory to
create a new thread when needed. Unlike the otherwise
equivalent <tt>newFixedThreadPool(1, threadFactory)</tt> the
returned executor is guaranteed not to be reconfigurable to use
additional threads.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>threadFactory</code> - the factory to use when creating new
threads</dd>
<dt><span class="strong">Returns:</span></dt><dd>the newly created single-threaded Executor</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if threadFactory is null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> newCachedThreadPool()</pre>
<div class="block">Creates a thread pool that creates new threads as needed, but
will reuse previously constructed threads when they are
available. These pools will typically improve the performance
of programs that execute many short-lived asynchronous tasks.
Calls to <tt>execute</tt> will reuse previously constructed
threads if available. If no existing thread is available, a new
thread will be created and added to the pool. Threads that have
not been used for sixty seconds are terminated and removed from
the cache. Thus, a pool that remains idle for long enough will
not consume any resources. Note that pools with similar
properties but different details (for example, timeout parameters)
may be created using <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadPoolExecutor.html" title="class in edu.emory.mathcs.backport.java.util.concurrent"><code>ThreadPoolExecutor</code></a> constructors.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the newly created thread pool</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> newCachedThreadPool(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</pre>
<div class="block">Creates a thread pool that creates new threads as needed, but
will reuse previously constructed threads when they are
available, and uses the provided
ThreadFactory to create new threads when needed.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>threadFactory</code> - the factory to use when creating new threads</dd>
<dt><span class="strong">Returns:</span></dt><dd>the newly created thread pool</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if threadFactory is null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> newSingleThreadScheduledExecutor()</pre>
<div class="block">Creates a single-threaded executor that can schedule commands
to run after a given delay, or to execute periodically.
(Note however that if this single
thread terminates due to a failure during execution prior to
shutdown, a new one will take its place if needed to execute
subsequent tasks.) Tasks are guaranteed to execute
sequentially, and no more than one task will be active at any
given time. Unlike the otherwise equivalent
<tt>newScheduledThreadPool(1)</tt> the returned executor is
guaranteed not to be reconfigurable to use additional threads.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the newly created scheduled executor</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> newSingleThreadScheduledExecutor(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</pre>
<div class="block">Creates a single-threaded executor that can schedule commands
to run after a given delay, or to execute periodically. (Note
however that if this single thread terminates due to a failure
during execution prior to shutdown, a new one will take its
place if needed to execute subsequent tasks.) Tasks are
guaranteed to execute sequentially, and no more than one task
will be active at any given time. Unlike the otherwise
equivalent <tt>newScheduledThreadPool(1, threadFactory)</tt>
the returned executor is guaranteed not to be reconfigurable to
use additional threads.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>threadFactory</code> - the factory to use when creating new
threads</dd>
<dt><span class="strong">Returns:</span></dt><dd>a newly created scheduled executor</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if threadFactory is null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> newScheduledThreadPool(int corePoolSize)</pre>
<div class="block">Creates a thread pool that can schedule commands to run after a
given delay, or to execute periodically.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>corePoolSize</code> - the number of threads to keep in the pool,
even if they are idle.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a newly created scheduled thread pool</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if <tt>corePoolSize < 0</tt></dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> newScheduledThreadPool(int corePoolSize,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> threadFactory)</pre>
<div class="block">Creates a thread pool that can schedule commands to run after a
given delay, or to execute periodically.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>corePoolSize</code> - the number of threads to keep in the pool,
even if they are idle.</dd><dd><code>threadFactory</code> - the factory to use when the executor
creates a new thread.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a newly created scheduled thread pool</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if <tt>corePoolSize < 0</tt></dd>
<dd><code>java.lang.NullPointerException</code> - if threadFactory is null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> unconfigurableExecutorService(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a> executor)</pre>
<div class="block">Returns an object that delegates all defined <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ExecutorService</code></a> methods to the given executor, but not any
other methods that might otherwise be accessible using
casts. This provides a way to safely "freeze" configuration and
disallow tuning of a given concrete implementation.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>executor</code> - the underlying implementation</dd>
<dt><span class="strong">Returns:</span></dt><dd>an <tt>ExecutorService</tt> instance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if executor null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> unconfigurableScheduledExecutorService(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledExecutorService</a> executor)</pre>
<div class="block">Returns an object that delegates all defined <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>ScheduledExecutorService</code></a> methods to the given executor, but
not any other methods that might otherwise be accessible using
casts. This provides a way to safely "freeze" configuration and
disallow tuning of a given concrete implementation.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>executor</code> - the underlying implementation</dd>
<dt><span class="strong">Returns:</span></dt><dd>a <tt>ScheduledExecutorService</tt> instance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if executor null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> defaultThreadFactory()</pre>
<div class="block">Returns a default thread factory used to create new threads.
This factory creates all new threads used by an Executor in the
same <code>ThreadGroup</code>. If there is a <code>SecurityManager</code>, it uses the group of <code>System.getSecurityManager()</code>, else the group of the thread
invoking this <tt>defaultThreadFactory</tt> method. Each new
thread is created as a non-daemon thread with priority set to
the smaller of <tt>Thread.NORM_PRIORITY</tt> and the maximum
priority permitted in the thread group. New threads have names
accessible via <code>Thread.getName()</code> of
<em>pool-N-thread-M</em>, where <em>N</em> is the sequence
number of this factory, and <em>M</em> is the sequence number
of the thread created by this factory.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a thread factory</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadFactory.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ThreadFactory</a> privilegedThreadFactory()</pre>
<div class="block">Returns a thread factory used to create new threads that
have the same permissions as the current thread.
This factory creates threads with the same settings as <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html#defaultThreadFactory()"><code>defaultThreadFactory()</code></a>, additionally setting the
AccessControlContext and contextClassLoader of new threads to
be the same as the thread invoking this
<tt>privilegedThreadFactory</tt> method. A new
<tt>privilegedThreadFactory</tt> can be created within an
<code>AccessController.doPrivileged(java.security.PrivilegedAction)</code> action setting the
current thread's access control context to create threads with
the selected permission settings holding within that action.
<p> Note that while tasks running within such threads will have
the same access control and class loader settings as the
current thread, they need not have the same <code>ThreadLocal</code> or <code>InheritableThreadLocal</code> values. If necessary,
particular values of thread locals can be set or reset before
any task runs in <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadPoolExecutor.html" title="class in edu.emory.mathcs.backport.java.util.concurrent"><code>ThreadPoolExecutor</code></a> subclasses using
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ThreadPoolExecutor.html#beforeExecute(java.lang.Thread, java.lang.Runnable)"><code>ThreadPoolExecutor.beforeExecute(java.lang.Thread, java.lang.Runnable)</code></a>. Also, if it is
necessary to initialize worker threads to have the same
InheritableThreadLocal settings as some other designated
thread, you can create a custom ThreadFactory in which that
thread waits for and services requests to create others that
will inherit its values.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a thread factory</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.security.AccessControlException</code> - if the current access control
context does not have permission to both get and set context
class loader.</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable(java.lang.Runnable task,
java.lang.Object result)</pre>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given task and returns the given result. This
can be useful when applying methods requiring a
<tt>Callable</tt> to an otherwise resultless action.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>task</code> - the task to run</dd><dd><code>result</code> - the result to return</dd>
<dt><span class="strong">Returns:</span></dt><dd>a callable object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if task null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable(java.lang.Runnable task)</pre>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given task and returns <tt>null</tt>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>task</code> - the task to run</dd>
<dt><span class="strong">Returns:</span></dt><dd>a callable object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if task null</dd></dl>
</li>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable(java.security.PrivilegedAction action)</pre>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given privileged action and returns its result.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>action</code> - the privileged action to run</dd>
<dt><span class="strong">Returns:</span></dt><dd>a callable object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if action null</dd></dl>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable(java.security.PrivilegedExceptionAction action)</pre>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that, when
called, runs the given privileged exception action and returns
its result.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>action</code> - the privileged exception action to run</dd>
<dt><span class="strong">Returns:</span></dt><dd>a callable object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if action null</dd></dl>
</li>
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<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> privilegedCallable(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable)</pre>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that will, when
called, execute the given <tt>callable</tt> under the current
access control context. This method should normally be
invoked within an <code>AccessController.doPrivileged(java.security.PrivilegedAction)</code> action
to create callables that will, if possible, execute under the
selected permission settings holding within that action; or if
not possible, throw an associated <code>AccessControlException</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>callable</code> - the underlying task</dd>
<dt><span class="strong">Returns:</span></dt><dd>a callable object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if callable null</dd></dl>
</li>
</ul>
<a name="privilegedCallableUsingCurrentClassLoader(edu.emory.mathcs.backport.java.util.concurrent.Callable)">
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<h4>privilegedCallableUsingCurrentClassLoader</h4>
<pre>public static <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> privilegedCallableUsingCurrentClassLoader(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable)</pre>
<div class="block">Returns a <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent"><code>Callable</code></a> object that will, when
called, execute the given <tt>callable</tt> under the current
access control context, with the current context class loader
as the context class loader. This method should normally be
invoked within an <code>AccessController.doPrivileged(java.security.PrivilegedAction)</code> action
to create callables that will, if possible, execute under the
selected permission settings holding within that action; or if
not possible, throw an associated <code>AccessControlException</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>callable</code> - the underlying task</dd>
<dt><span class="strong">Returns:</span></dt><dd>a callable object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NullPointerException</code> - if callable null</dd>
<dd><code>java.security.AccessControlException</code> - if the current access control
context does not have permission to both set and get context
class loader.</dd></dl>
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