content/docs/r3.3.1/api/org/apache/hadoop/yarn/event/AsyncDispatcher.html - hadoop-site - Git at Google

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 <h2 title="Class AsyncDispatcher" class="title">Class AsyncDispatcher</h2>
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 <pre>@InterfaceAudience.Public
  @InterfaceStability.Evolving
 public class <span class="typeNameLabel">AsyncDispatcher</span>
 extends <a href="../../../../../org/apache/hadoop/service/AbstractService.html" title="class in org.apache.hadoop.service">AbstractService</a>
 implements <a href="../../../../../org/apache/hadoop/yarn/event/Dispatcher.html" title="interface in org.apache.hadoop.yarn.event">Dispatcher</a></pre>
 <div class="block">Dispatches <a href="../../../../../org/apache/hadoop/yarn/event/Event.html" title="interface in org.apache.hadoop.yarn.event"><code>Event</code></a>s in a separate thread. Currently only single thread
  does that. Potentially there could be multiple channels for each event type
  class and a thread pool can be used to dispatch the events.</div>
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 <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a>&gt;,<a href="../../../../../org/apache/hadoop/yarn/event/EventHandler.html" title="interface in org.apache.hadoop.yarn.event">EventHandler</a>&gt;</code></td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#AsyncDispatcher--">AsyncDispatcher</a></span>()</code>&nbsp;</td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#AsyncDispatcher-java.util.concurrent.BlockingQueue-">AsyncDispatcher</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html?is-external=true" title="class or interface in java.util.concurrent">BlockingQueue</a>&lt;<a href="../../../../../org/apache/hadoop/yarn/event/Event.html" title="interface in org.apache.hadoop.yarn.event">Event</a>&gt;&nbsp;eventQueue)</code>&nbsp;</td>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#addMetrics-org.apache.hadoop.yarn.metrics.EventTypeMetrics-java.lang.Class-">addMetrics</a></span>(org.apache.hadoop.yarn.metrics.EventTypeMetrics&nbsp;metrics,
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#disableExitOnDispatchException--">disableExitOnDispatchException</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#dispatch-org.apache.hadoop.yarn.event.Event-">dispatch</a></span>(<a href="../../../../../org/apache/hadoop/yarn/event/Event.html" title="interface in org.apache.hadoop.yarn.event">Event</a>&nbsp;event)</code>&nbsp;</td>
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 <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/yarn/event/EventHandler.html" title="interface in org.apache.hadoop.yarn.event">EventHandler</a>&lt;<a href="../../../../../org/apache/hadoop/yarn/event/Event.html" title="interface in org.apache.hadoop.yarn.event">Event</a>&gt;</code></td>
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 <td class="colFirst"><code>protected boolean</code></td>
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 <td class="colFirst"><code>protected boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#isEventThreadWaiting--">isEventThreadWaiting</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code>protected boolean</code></td>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#register-java.lang.Class-org.apache.hadoop.yarn.event.EventHandler-">register</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a>&gt;&nbsp;eventType,
         <a href="../../../../../org/apache/hadoop/yarn/event/EventHandler.html" title="interface in org.apache.hadoop.yarn.event">EventHandler</a>&nbsp;handler)</code>&nbsp;</td>
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 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#serviceInit-org.apache.hadoop.conf.Configuration-">serviceInit</a></span>(<a href="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</code>
 <div class="block">All initialization code needed by a service.</div>
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 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#serviceStart--">serviceStart</a></span>()</code>
 <div class="block">Actions called during the INITED to STARTED transition.</div>
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 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#serviceStop--">serviceStop</a></span>()</code>
 <div class="block">Actions called during the transition to the STOPPED state.</div>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/yarn/event/AsyncDispatcher.html#setDrainEventsOnStop--">setDrainEventsOnStop</a></span>()</code>&nbsp;</td>
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 <pre>protected final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a>&gt;,<a href="../../../../../org/apache/hadoop/yarn/event/EventHandler.html" title="interface in org.apache.hadoop.yarn.event">EventHandler</a>&gt; eventDispatchers</pre>
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 <pre>public&nbsp;AsyncDispatcher(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/BlockingQueue.html?is-external=true" title="class or interface in java.util.concurrent">BlockingQueue</a>&lt;<a href="../../../../../org/apache/hadoop/yarn/event/Event.html" title="interface in org.apache.hadoop.yarn.event">Event</a>&gt;&nbsp;eventQueue)</pre>
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 <pre>public&nbsp;AsyncDispatcher(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;dispatcherName)</pre>
 <div class="block">Set a name for this dispatcher thread.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>dispatcherName</code> - name of the dispatcher thread</dd>
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 <pre>protected&nbsp;void&nbsp;serviceInit(<a href="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)
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 <div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/service/AbstractService.html#serviceInit-org.apache.hadoop.conf.Configuration-">AbstractService</a></code></span></div>
 <div class="block">All initialization code needed by a service.

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  a specific service instance.

  Implementations do not need to be synchronized as the logic
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  The base implementation checks to see if the subclass has created
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