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<div class="subTitle">org.apache.ignite.streamer.router</div>
<h2 title="Class StreamerAffinityEventRouter" class="title">Class StreamerAffinityEventRouter</h2>
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<li>org.apache.ignite.streamer.router.StreamerAffinityEventRouter</li>
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<pre>public class <span class="strong">StreamerAffinityEventRouter</span>
extends <a href="../../../../../org/apache/ignite/streamer/StreamerEventRouterAdapter.html" title="class in org.apache.ignite.streamer">StreamerEventRouterAdapter</a></pre>
<div class="block">Router used to colocate identical streamer events or events with identical affinity
key on the same node. Such collocation is often required to perform computations on
multiple events together, for example, find number of occurrences of a word in some
text. In this case you would collocate identical words together to make sure that
you can update their counts.
<h1 class="header">Affinity Key</h1>
Affinity key for collocation of event together on the same node is specified
via <a href="../../../../../org/apache/ignite/streamer/router/StreamerAffinityEventRouter.AffinityEvent.html#affinityKey()"><code>StreamerAffinityEventRouter.AffinityEvent.affinityKey()</code></a> method. If event does not implement
<a href="../../../../../org/apache/ignite/streamer/router/StreamerAffinityEventRouter.AffinityEvent.html" title="interface in org.apache.ignite.streamer.router"><code>StreamerAffinityEventRouter.AffinityEvent</code></a> interface, then event itself will be used to determine affinity.</div>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/streamer/router/StreamerAffinityEventRouter.AffinityEvent.html" title="interface in org.apache.ignite.streamer.router">StreamerAffinityEventRouter.AffinityEvent</a></strong></code>
<div class="block">All events that implement this interface will be routed based on key affinity.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/streamer/router/StreamerAffinityEventRouter.html#REPLICA_CNT">REPLICA_CNT</a></strong></code>&nbsp;</td>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/ignite/streamer/router/StreamerAffinityEventRouter.html#StreamerAffinityEventRouter()">StreamerAffinityEventRouter</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code><span class='angle_bracket'>&lt;</span>T<span class='angle_bracket'>&gt;</span>&nbsp;<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/streamer/router/StreamerAffinityEventRouter.html#route(org.apache.ignite.streamer.StreamerContext, java.lang.String, T)">route</a></strong>(<a href="../../../../../org/apache/ignite/streamer/StreamerContext.html" title="interface in org.apache.ignite.streamer">StreamerContext</a>&nbsp;ctx,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;stageName,
T&nbsp;evt)</code>
<div class="block">Selects a node for given event that should be processed by a stage with given name.</div>
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<code><a href="../../../../../org/apache/ignite/streamer/StreamerEventRouterAdapter.html#route(org.apache.ignite.streamer.StreamerContext, java.lang.String, java.util.Collection)">route</a></code></li>
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<h4>REPLICA_CNT</h4>
<pre>public static final&nbsp;int REPLICA_CNT</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.ignite.streamer.router.StreamerAffinityEventRouter.REPLICA_CNT">Constant Field Values</a></dd></dl>
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<pre>public&nbsp;StreamerAffinityEventRouter()</pre>
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<pre>public&nbsp;<span class='angle_bracket'>&lt;</span>T<span class='angle_bracket'>&gt;</span>&nbsp;<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;route(<a href="../../../../../org/apache/ignite/streamer/StreamerContext.html" title="interface in org.apache.ignite.streamer">StreamerContext</a>&nbsp;ctx,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;stageName,
T&nbsp;evt)</pre>
<div class="block">Selects a node for given event that should be processed by a stage with given name.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>ctx</code> - Streamer context.</dd><dd><code>stageName</code> - Stage name.</dd><dd><code>evt</code> - Event to route.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Node to route to. If this method returns <code>null</code> then the whole pipeline execution
will be terminated. All running and ongoing stages for pipeline execution will be
cancelled.</dd></dl>
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