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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>EventMachine (Naga API)</title>
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="../../naga/eventmachine/package-summary.html">naga.eventmachine</a></div>
<h2 title="Class EventMachine" class="title">Class EventMachine</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>naga.eventmachine.EventMachine</li>
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<pre>public class <span class="typeNameLabel">EventMachine</span>
extends java.lang.Object</pre>
<div class="block">EventMachine is a simple event service for driving asynchronous and delayed tasks
 together with the a Naga NIOService.
 <p>
 Creating and starting an event machine:
 <pre>
 EventMachine em = new EventMachine();
 // Start our event machine thread:
 em.start();
 </pre>
 Delayed execution:
 <pre>
 em.executeLater(new Runnable() {
   public void run()
   {
      // Code here will execute after 1 second on the nio thread.
   }
 }, 1000);
 </pre>
 Asynchronous execution, i.e. putting a task from another thread
 to be executed on the EventMachine thread.
 <pre>
 em.asyncExecute(new Runnable() {
   public void run()
   {
      // Code here will be executed on the nio thread.
   }
 });
 </pre>
 It is possible to cancel scheduled tasks:
 <pre>
 // Schedule an event
 DelayedEvent event = em.executeLater(new Runnable()
   public void run()
   {
      // Code to run in 1 minute.
   }
 }, 60000);
 // Cancel the event before it is executed.
 event.cancel();
 </pre></div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Christoffer Lerno</dd>
</dl>
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<th class="colFirst" scope="col">Constructor</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#EventMachine--">EventMachine</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Creates a new EventMachine with an embedded NIOService.</div>
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<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#asyncExecute-java.lang.Runnable-">asyncExecute</a></span>&#8203;(java.lang.Runnable&nbsp;runnable)</code></th>
<td class="colLast">
<div class="block">Execute a runnable on the Event/NIO thread.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../naga/eventmachine/DelayedEvent.html" title="interface in naga.eventmachine">DelayedEvent</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#executeAt-java.lang.Runnable-java.util.Date-">executeAt</a></span>&#8203;(java.lang.Runnable&nbsp;runnable,
         java.util.Date&nbsp;date)</code></th>
<td class="colLast">
<div class="block">Execute a runnable on the Event/NIO thread after at a certain time.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../naga/eventmachine/DelayedEvent.html" title="interface in naga.eventmachine">DelayedEvent</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#executeLater-java.lang.Runnable-long-">executeLater</a></span>&#8203;(java.lang.Runnable&nbsp;runnable,
            long&nbsp;msDelay)</code></th>
<td class="colLast">
<div class="block">Execute a runnable on the Event/NIO thread after a delay.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../naga/NIOService.html" title="class in naga">NIOService</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#getNIOService--">getNIOService</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Returns the NIOService used by this event service.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>java.util.Queue&lt;<a href="../../naga/eventmachine/DelayedEvent.html" title="interface in naga.eventmachine">DelayedEvent</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#getQueue--">getQueue</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Return the current event service queue.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#getQueueSize--">getQueueSize</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Return the current queue size.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#setObserver-naga.ExceptionObserver-">setObserver</a></span>&#8203;(<a href="../../naga/ExceptionObserver.html" title="interface in naga">ExceptionObserver</a>&nbsp;observer)</code></th>
<td class="colLast">
<div class="block">Sets the ExceptionObserver for this service.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#shutdown--">shutdown</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Stops the event machine and closes the underlying NIO service, it is not possible to
 restart the event machine after shutdown.</div>
</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="../../naga/eventmachine/EventMachine.html#start--">start</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Causes the event machine to start running on a separate thread together with the
 NIOService.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#stop--">stop</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Stops the event machine thread, it may be restarted using start()</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../naga/eventmachine/EventMachine.html#timeOfNextEvent--">timeOfNextEvent</a></span>&#8203;()</code></th>
<td class="colLast">
<div class="block">Returns the time when the next scheduled event will execute.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>EventMachine</h4>
<pre>public&nbsp;EventMachine&#8203;()
             throws java.io.IOException</pre>
<div class="block">Creates a new EventMachine with an embedded NIOService.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if we fail to set up the internal NIOService.</dd>
</dl>
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<h4>asyncExecute</h4>
<pre>public&nbsp;void&nbsp;asyncExecute&#8203;(java.lang.Runnable&nbsp;runnable)</pre>
<div class="block">Execute a runnable on the Event/NIO thread.
 <p>
 <em>This method is thread-safe.</em></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>runnable</code> - the runnable to execute on the server thread as soon as possible,</dd>
</dl>
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<h4>executeLater</h4>
<pre>public&nbsp;<a href="../../naga/eventmachine/DelayedEvent.html" title="interface in naga.eventmachine">DelayedEvent</a>&nbsp;executeLater&#8203;(java.lang.Runnable&nbsp;runnable,
                                 long&nbsp;msDelay)</pre>
<div class="block">Execute a runnable on the Event/NIO thread after a delay.
 <p>
 This is the primary way to execute delayed events, typically time-outs and similar
 behaviour.
 <p>
 <em>This method is thread-safe.</em></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>runnable</code> - the runnable to execute after the given delay.</dd>
<dd><code>msDelay</code> - the delay until executing this runnable.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the delayed event created to execute later. This can be used
 to cancel the event.</dd>
</dl>
</li>
</ul>
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<h4>executeAt</h4>
<pre>public&nbsp;<a href="../../naga/eventmachine/DelayedEvent.html" title="interface in naga.eventmachine">DelayedEvent</a>&nbsp;executeAt&#8203;(java.lang.Runnable&nbsp;runnable,
                              java.util.Date&nbsp;date)</pre>
<div class="block">Execute a runnable on the Event/NIO thread after at a certain time.
 <p/>
 This is the primary way to execute scheduled events.
 <p/>
 <em>This method is thread-safe.</em></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>runnable</code> - the runnable to execute at the given time.</dd>
<dd><code>date</code> - the time date when this runnable should execute.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the delayed event created to execute later. This can be used
 to cancel the event.</dd>
</dl>
</li>
</ul>
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<h4>setObserver</h4>
<pre>public&nbsp;void&nbsp;setObserver&#8203;(<a href="../../naga/ExceptionObserver.html" title="interface in naga">ExceptionObserver</a>&nbsp;observer)</pre>
<div class="block">Sets the ExceptionObserver for this service.
 <p>
 The observer will receive all exceptions thrown by the underlying NIOService
 and by queued events.
 <p>
 <em>This method is thread-safe.</em></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>observer</code> - the observer to use, null will cause exceptions to log to stderr</dd>
</dl>
</li>
</ul>
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<h4>timeOfNextEvent</h4>
<pre>public&nbsp;long&nbsp;timeOfNextEvent&#8203;()</pre>
<div class="block">Returns the time when the next scheduled event will execute.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a long representing the date of the next event, or Long.MAX_VALUE if
 no event is scheduled.</dd>
</dl>
</li>
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<h4>start</h4>
<pre>public&nbsp;void&nbsp;start&#8203;()</pre>
<div class="block">Causes the event machine to start running on a separate thread together with the
 NIOService.
 <p/>
 Note that the NIOService should not be called (using <a href="../../naga/NIOService.html#selectNonBlocking--"><code>NIOService.selectNonBlocking()</code></a> and related
 functions) on another thread if the EventMachine is used.</div>
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<h4>stop</h4>
<pre>public&nbsp;void&nbsp;stop&#8203;()</pre>
<div class="block">Stops the event machine thread, it may be restarted using start()</div>
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<h4>shutdown</h4>
<pre>public&nbsp;void&nbsp;shutdown&#8203;()</pre>
<div class="block">Stops the event machine and closes the underlying NIO service, it is not possible to
 restart the event machine after shutdown.</div>
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<h4>getNIOService</h4>
<pre>public&nbsp;<a href="../../naga/NIOService.html" title="class in naga">NIOService</a>&nbsp;getNIOService&#8203;()</pre>
<div class="block">Returns the NIOService used by this event service.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the NIOService that this event service uses.</dd>
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<h4>getQueue</h4>
<pre>public&nbsp;java.util.Queue&lt;<a href="../../naga/eventmachine/DelayedEvent.html" title="interface in naga.eventmachine">DelayedEvent</a>&gt;&nbsp;getQueue&#8203;()</pre>
<div class="block">Return the current event service queue.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a copy of the current queue.</dd>
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<h4>getQueueSize</h4>
<pre>public&nbsp;int&nbsp;getQueueSize&#8203;()</pre>
<div class="block">Return the current queue size.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number events in the event queue.</dd>
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