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<div class="subTitle">edu.emory.mathcs.backport.java.util.concurrent</div>
<h2 title="Interface ScheduledExecutorService" class="title">Interface ScheduledExecutorService</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executor.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Executor</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledThreadPoolExecutor.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">ScheduledThreadPoolExecutor</a></dd>
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<pre>public interface <span class="strong">ScheduledExecutorService</span>
extends <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></pre>
<div class="block">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> that can schedule commands to run after a given
delay, or to execute periodically.
<p> The <tt>schedule</tt> methods create tasks with various delays
and return a task object that can be used to cancel or check
execution. The <tt>scheduleAtFixedRate</tt> and
<tt>scheduleWithFixedDelay</tt> methods create and execute tasks
that run periodically until cancelled.
<p> Commands submitted using the <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executor.html#execute(java.lang.Runnable)"><code>Executor.execute(java.lang.Runnable)</code></a> and
<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> <tt>submit</tt> methods are scheduled with
a requested delay of zero. Zero and negative delays (but not
periods) are also allowed in <tt>schedule</tt> methods, and are
treated as requests for immediate execution.
<p>All <tt>schedule</tt> methods accept <em>relative</em> delays and
periods as arguments, not absolute times or dates. It is a simple
matter to transform an absolute time represented as a <code>Date</code> to the required form. For example, to schedule at
a certain future <tt>date</tt>, you can use: <tt>schedule(task,
date.getTime() - System.currentTimeMillis(),
TimeUnit.MILLISECONDS)</tt>. Beware however that expiration of a
relative delay need not coincide with the current <tt>Date</tt> at
which the task is enabled due to network time synchronization
protocols, clock drift, or other factors.
The <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executors.html" title="class in edu.emory.mathcs.backport.java.util.concurrent"><code>Executors</code></a> class provides convenient factory methods for
the ScheduledExecutorService implementations provided in this package.
<h3>Usage Example</h3>
Here is a class with a method that sets up a ScheduledExecutorService
to beep every ten seconds for an hour:
<pre>
import static edu.emory.mathcs.backport.java.util.concurrent.TimeUnit.*;
class BeeperControl {
private final ScheduledExecutorService scheduler =
Executors.newScheduledThreadPool(1);
public void beepForAnHour() {
final Runnable beeper = new Runnable() {
public void run() { System.out.println("beep"); }
};
final ScheduledFuture<?> beeperHandle =
scheduler.scheduleAtFixedRate(beeper, 10, 10, SECONDS);
scheduler.schedule(new Runnable() {
public void run() { beeperHandle.cancel(true); }
}, 60 * 60, SECONDS);
}
}
</pre></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>
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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><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html#schedule(edu.emory.mathcs.backport.java.util.concurrent.Callable, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">schedule</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,
long delay,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Creates and executes a ScheduledFuture that becomes enabled after the
given delay.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html#schedule(java.lang.Runnable, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">schedule</a></strong>(java.lang.Runnable command,
long delay,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Creates and executes a one-shot action that becomes enabled
after the given delay.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html#scheduleAtFixedRate(java.lang.Runnable, long, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">scheduleAtFixedRate</a></strong>(java.lang.Runnable command,
long initialDelay,
long period,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Creates and executes a periodic action that becomes enabled first
after the given initial delay, and subsequently with the given
period; that is executions will commence after
<tt>initialDelay</tt> then <tt>initialDelay+period</tt>, then
<tt>initialDelay + 2 * period</tt>, and so on.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledExecutorService.html#scheduleWithFixedDelay(java.lang.Runnable, long, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">scheduleWithFixedDelay</a></strong>(java.lang.Runnable command,
long initialDelay,
long delay,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</code>
<div class="block">Creates and executes a periodic action that becomes enabled first
after the given initial delay, and subsequently with the
given delay between the termination of one execution and the
commencement of the next.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from interface edu.emory.mathcs.backport.java.util.concurrent.<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ExecutorService</a></h3>
<code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#awaitTermination(long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">awaitTermination</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#invokeAll(java.util.Collection)">invokeAll</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#invokeAll(java.util.Collection, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">invokeAll</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#invokeAny(java.util.Collection)">invokeAny</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#invokeAny(java.util.Collection, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">invokeAny</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#isShutdown()">isShutdown</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#isTerminated()">isTerminated</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#shutdown()">shutdown</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#shutdownNow()">shutdownNow</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#submit(edu.emory.mathcs.backport.java.util.concurrent.Callable)">submit</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#submit(java.lang.Runnable)">submit</a>, <a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ExecutorService.html#submit(java.lang.Runnable, java.lang.Object)">submit</a></code></li>
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<h3>Methods inherited from interface edu.emory.mathcs.backport.java.util.concurrent.<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executor.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Executor</a></h3>
<code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Executor.html#execute(java.lang.Runnable)">execute</a></code></li>
</ul>
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<h3>Method Detail</h3>
<a name="schedule(java.lang.Runnable, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<h4>schedule</h4>
<pre><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a> schedule(java.lang.Runnable command,
long delay,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</pre>
<div class="block">Creates and executes a one-shot action that becomes enabled
after the given delay.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>command</code> - the task to execute</dd><dd><code>delay</code> - the time from now to delay execution</dd><dd><code>unit</code> - the time unit of the delay parameter</dd>
<dt><span class="strong">Returns:</span></dt><dd>a ScheduledFuture representing pending completion of
the task and whose <tt>get()</tt> method will return
<tt>null</tt> upon completion</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/RejectedExecutionException.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">RejectedExecutionException</a></code> - if the task cannot be
scheduled for execution</dd>
<dd><code>java.lang.NullPointerException</code> - if command is null</dd></dl>
</li>
</ul>
<a name="schedule(edu.emory.mathcs.backport.java.util.concurrent.Callable, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<h4>schedule</h4>
<pre><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a> schedule(<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/Callable.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">Callable</a> callable,
long delay,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</pre>
<div class="block">Creates and executes a ScheduledFuture that becomes enabled after the
given delay.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>callable</code> - the function to execute</dd><dd><code>delay</code> - the time from now to delay execution</dd><dd><code>unit</code> - the time unit of the delay parameter</dd>
<dt><span class="strong">Returns:</span></dt><dd>a ScheduledFuture that can be used to extract result or cancel</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/RejectedExecutionException.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">RejectedExecutionException</a></code> - if the task cannot be
scheduled for execution</dd>
<dd><code>java.lang.NullPointerException</code> - if callable is null</dd></dl>
</li>
</ul>
<a name="scheduleAtFixedRate(java.lang.Runnable, long, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<h4>scheduleAtFixedRate</h4>
<pre><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a> scheduleAtFixedRate(java.lang.Runnable command,
long initialDelay,
long period,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</pre>
<div class="block">Creates and executes a periodic action that becomes enabled first
after the given initial delay, and subsequently with the given
period; that is executions will commence after
<tt>initialDelay</tt> then <tt>initialDelay+period</tt>, then
<tt>initialDelay + 2 * period</tt>, and so on.
If any execution of the task
encounters an exception, subsequent executions are suppressed.
Otherwise, the task will only terminate via cancellation or
termination of the executor. If any execution of this task
takes longer than its period, then subsequent executions
may start late, but will not concurrently execute.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>command</code> - the task to execute</dd><dd><code>initialDelay</code> - the time to delay first execution</dd><dd><code>period</code> - the period between successive executions</dd><dd><code>unit</code> - the time unit of the initialDelay and period parameters</dd>
<dt><span class="strong">Returns:</span></dt><dd>a ScheduledFuture representing pending completion of
the task, and whose <tt>get()</tt> method will throw an
exception upon cancellation</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/RejectedExecutionException.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">RejectedExecutionException</a></code> - if the task cannot be
scheduled for execution</dd>
<dd><code>java.lang.NullPointerException</code> - if command is null</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if period less than or equal to zero</dd></dl>
</li>
</ul>
<a name="scheduleWithFixedDelay(java.lang.Runnable, long, long, edu.emory.mathcs.backport.java.util.concurrent.TimeUnit)">
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<h4>scheduleWithFixedDelay</h4>
<pre><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/ScheduledFuture.html" title="interface in edu.emory.mathcs.backport.java.util.concurrent">ScheduledFuture</a> scheduleWithFixedDelay(java.lang.Runnable command,
long initialDelay,
long delay,
<a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/TimeUnit.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">TimeUnit</a> unit)</pre>
<div class="block">Creates and executes a periodic action that becomes enabled first
after the given initial delay, and subsequently with the
given delay between the termination of one execution and the
commencement of the next. If any execution of the task
encounters an exception, subsequent executions are suppressed.
Otherwise, the task will only terminate via cancellation or
termination of the executor.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>command</code> - the task to execute</dd><dd><code>initialDelay</code> - the time to delay first execution</dd><dd><code>delay</code> - the delay between the termination of one
execution and the commencement of the next</dd><dd><code>unit</code> - the time unit of the initialDelay and delay parameters</dd>
<dt><span class="strong">Returns:</span></dt><dd>a ScheduledFuture representing pending completion of
the task, and whose <tt>get()</tt> method will throw an
exception upon cancellation</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../../../edu/emory/mathcs/backport/java/util/concurrent/RejectedExecutionException.html" title="class in edu.emory.mathcs.backport.java.util.concurrent">RejectedExecutionException</a></code> - if the task cannot be
scheduled for execution</dd>
<dd><code>java.lang.NullPointerException</code> - if command is null</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if delay less than or equal to zero</dd></dl>
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