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<div class="subTitle">org.apache.ignite.events</div>
<h2 title="Class DiscoveryEvent" class="title">Class DiscoveryEvent</h2>
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<li>org.apache.ignite.events.DiscoveryEvent</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;<a href="../../../../org/apache/ignite/events/Event.html" title="interface in org.apache.ignite.events">Event</a>&gt;, <a href="../../../../org/apache/ignite/events/Event.html" title="interface in org.apache.ignite.events">Event</a></dd>
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<pre>public class <span class="strong">DiscoveryEvent</span>
extends <a href="../../../../org/apache/ignite/events/EventAdapter.html" title="class in org.apache.ignite.events">EventAdapter</a></pre>
<div class="block">Grid discovery event.
<p>
Grid events are used for notification about what happens within the grid. Note that by
design Ignite keeps all events generated on the local node locally and it provides
APIs for performing a distributed queries across multiple nodes:
<ul>
<li>
<a href="../../../../org/apache/ignite/IgniteEvents.html#remoteQuery(org.apache.ignite.lang.IgnitePredicate,%20long,%20int...)"><code>IgniteEvents.remoteQuery(org.apache.ignite.lang.IgnitePredicate, long, int...)</code></a> -
asynchronously querying events occurred on the nodes specified, including remote nodes.
</li>
<li>
<a href="../../../../org/apache/ignite/IgniteEvents.html#localQuery(org.apache.ignite.lang.IgnitePredicate,%20int...)"><code>IgniteEvents.localQuery(org.apache.ignite.lang.IgnitePredicate, int...)</code></a> -
querying only local events stored on this local node.
</li>
<li>
<a href="../../../../org/apache/ignite/IgniteEvents.html#localListen(org.apache.ignite.lang.IgnitePredicate,%20int...)"><code>IgniteEvents.localListen(org.apache.ignite.lang.IgnitePredicate, int...)</code></a> -
listening to local grid events (events from remote nodes not included).
</li>
</ul>
User can also wait for events using method <a href="../../../../org/apache/ignite/IgniteEvents.html#waitForLocal(org.apache.ignite.lang.IgnitePredicate,%20int...)"><code>IgniteEvents.waitForLocal(org.apache.ignite.lang.IgnitePredicate, int...)</code></a>.
<h1 class="header">Events and Performance</h1>
Note that by default all events in Ignite are enabled and therefore generated and stored
by whatever event storage SPI is configured. Ignite can and often does generate thousands events per seconds
under the load and therefore it creates a significant additional load on the system. If these events are
not needed by the application this load is unnecessary and leads to significant performance degradation.
<p>
It is <b>highly recommended</b> to enable only those events that your application logic requires
by using <a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getIncludeEventTypes()"><code>IgniteConfiguration.getIncludeEventTypes()</code></a> method in Ignite configuration. Note that certain
events are required for Ignite's internal operations and such events will still be generated but not stored by
event storage SPI if they are disabled in Ignite configuration.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_METRICS_UPDATED"><code>EventType.EVT_NODE_METRICS_UPDATED</code></a>,
<a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_FAILED"><code>EventType.EVT_NODE_FAILED</code></a>,
<a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_JOINED"><code>EventType.EVT_NODE_JOINED</code></a>,
<a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_LEFT"><code>EventType.EVT_NODE_LEFT</code></a>,
<a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_SEGMENTED"><code>EventType.EVT_NODE_SEGMENTED</code></a>,
<a href="../../../../org/apache/ignite/events/EventType.html#EVTS_DISCOVERY_ALL"><code>EventType.EVTS_DISCOVERY_ALL</code></a>,
<a href="../../../../org/apache/ignite/events/EventType.html#EVTS_DISCOVERY"><code>EventType.EVTS_DISCOVERY</code></a>,
<a href="../../../../serialized-form.html#org.apache.ignite.events.DiscoveryEvent">Serialized Form</a></dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#DiscoveryEvent()">DiscoveryEvent</a></strong>()</code>
<div class="block">No-arg constructor.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#DiscoveryEvent(org.apache.ignite.cluster.ClusterNode,%20java.lang.String,%20int,%20org.apache.ignite.cluster.ClusterNode)">DiscoveryEvent</a></strong>(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node,
<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;msg,
int&nbsp;type,
<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;evtNode)</code>
<div class="block">Creates new discovery event with given parameters.</div>
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<td class="colFirst"><code><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/events/DiscoveryEvent.html#eventNode()">eventNode</a></strong>()</code>
<div class="block">Gets node that caused this event to be generated.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#eventNode(org.apache.ignite.cluster.ClusterNode)">eventNode</a></strong>(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;evtNode)</code>
<div class="block">Sets node this event is referring to.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><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></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#shortDisplay()">shortDisplay</a></strong>()</code>
<div class="block">Gets a shortened version of <code>toString()</code> result.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#topologyNodes()">topologyNodes</a></strong>()</code>
<div class="block">Gets topology nodes from topology snapshot.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#topologySnapshot(long,%20java.util.Collection)">topologySnapshot</a></strong>(long&nbsp;topVer,
<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;&nbsp;topSnapshot)</code>
<div class="block">Sets the topology snapshot.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#topologyVersion()">topologyVersion</a></strong>()</code>
<div class="block">Gets topology version if this event is raised on
topology change and configured discovery SPI implementation
supports topology versioning.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><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></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/events/DiscoveryEvent.html#toString()">toString</a></strong>()</code></td>
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<code><a href="../../../../org/apache/ignite/events/EventAdapter.html#compareTo(org.apache.ignite.events.Event)">compareTo</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#equals(java.lang.Object)">equals</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#hashCode()">hashCode</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#id()">id</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#localOrder()">localOrder</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#message()">message</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#message(java.lang.String)">message</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#name()">name</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#node()">node</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#node(org.apache.ignite.cluster.ClusterNode)">node</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#timestamp()">timestamp</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#type()">type</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html#type(int)">type</a></code></li>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<h4>DiscoveryEvent</h4>
<pre>public&nbsp;DiscoveryEvent()</pre>
<div class="block">No-arg constructor.</div>
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<h4>DiscoveryEvent</h4>
<pre>public&nbsp;DiscoveryEvent(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;node,
<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;msg,
int&nbsp;type,
<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;evtNode)</pre>
<div class="block">Creates new discovery event with given parameters.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>node</code> - Local node.</dd><dd><code>msg</code> - Optional event message.</dd><dd><code>type</code> - Event type.</dd><dd><code>evtNode</code> - Node that caused this event to be generated.</dd></dl>
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<h4>shortDisplay</h4>
<pre>public&nbsp;<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;shortDisplay()</pre>
<div class="block">Gets a shortened version of <code>toString()</code> result. Suitable for humans to read.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/events/Event.html#shortDisplay()">shortDisplay</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/ignite/events/Event.html" title="interface in org.apache.ignite.events">Event</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/events/EventAdapter.html#shortDisplay()">shortDisplay</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/ignite/events/EventAdapter.html" title="class in org.apache.ignite.events">EventAdapter</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>Shortened version of <code>toString()</code> result.</dd></dl>
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<h4>eventNode</h4>
<pre>public&nbsp;void&nbsp;eventNode(<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;evtNode)</pre>
<div class="block">Sets node this event is referring to.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>evtNode</code> - Event node.</dd></dl>
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<a name="eventNode()">
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<h4>eventNode</h4>
<pre>public&nbsp;<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&nbsp;eventNode()</pre>
<div class="block">Gets node that caused this event to be generated. It is potentially different from the node
on which this event was recorded. For example, node <code>A</code> locally recorded the event that a remote node
<code>B</code> joined the topology. In this case this method will return node <code>B</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Event node.</dd></dl>
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<h4>topologyVersion</h4>
<pre>public&nbsp;long&nbsp;topologyVersion()</pre>
<div class="block">Gets topology version if this event is raised on
topology change and configured discovery SPI implementation
supports topology versioning.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Topology version or <code>0</code> if configured discovery SPI implementation
does not support versioning.</dd></dl>
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<h4>topologyNodes</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;&nbsp;topologyNodes()</pre>
<div class="block">Gets topology nodes from topology snapshot. If SPI implementation does not support
versioning, the best effort snapshot will be captured.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Topology snapshot.</dd></dl>
</li>
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<a name="topologySnapshot(long, java.util.Collection)">
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<h4>topologySnapshot</h4>
<pre>public&nbsp;void&nbsp;topologySnapshot(long&nbsp;topVer,
<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;&nbsp;topSnapshot)</pre>
<div class="block">Sets the topology snapshot.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>topVer</code> - Topology version.</dd><dd><code>topSnapshot</code> - Topology snapshot.</dd></dl>
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<h4>toString</h4>
<pre>public&nbsp;<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;toString()</pre>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/events/EventAdapter.html#toString()">toString</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/ignite/events/EventAdapter.html" title="class in org.apache.ignite.events">EventAdapter</a></code></dd>
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<p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://ignite.apache.org"><nobr>2017 Copyright &#169; Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Ignite Fabric</b> </td> <td>:&nbsp;&nbsp; ver. <strong>2.1.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>:&nbsp;&nbsp; July 20 2017 </td> </tr> </tbody> </table> </td> </tr> </table></small></p>
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