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| <h2 title="Interface Event" class="title">Interface Event</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a><span class='angle_bracket'><</span><a href="../../../../org/apache/ignite/events/Event.html" title="interface in org.apache.ignite.events">Event</a><span class='angle_bracket'>></span>, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../org/apache/ignite/events/BaselineChangedEvent.html" title="class in org.apache.ignite.events">BaselineChangedEvent</a>, <a href="../../../../org/apache/ignite/events/BaselineConfigurationChangedEvent.html" title="class in org.apache.ignite.events">BaselineConfigurationChangedEvent</a>, <a href="../../../../org/apache/ignite/events/CacheConsistencyViolationEvent.html" title="class in org.apache.ignite.events">CacheConsistencyViolationEvent</a>, <a href="../../../../org/apache/ignite/events/CacheEvent.html" title="class in org.apache.ignite.events">CacheEvent</a>, <a href="../../../../org/apache/ignite/events/CacheQueryExecutedEvent.html" title="class in org.apache.ignite.events">CacheQueryExecutedEvent</a>, <a href="../../../../org/apache/ignite/events/CacheQueryReadEvent.html" title="class in org.apache.ignite.events">CacheQueryReadEvent</a>, <a href="../../../../org/apache/ignite/events/CacheRebalancingEvent.html" title="class in org.apache.ignite.events">CacheRebalancingEvent</a>, <a href="../../../../org/apache/ignite/events/CheckpointEvent.html" title="class in org.apache.ignite.events">CheckpointEvent</a>, <a href="../../../../org/apache/ignite/events/ClusterActivationEvent.html" title="class in org.apache.ignite.events">ClusterActivationEvent</a>, <a href="../../../../org/apache/ignite/events/ClusterStateChangeEvent.html" title="class in org.apache.ignite.events">ClusterStateChangeEvent</a>, <a href="../../../../org/apache/ignite/events/ClusterStateChangeStartedEvent.html" title="class in org.apache.ignite.events">ClusterStateChangeStartedEvent</a>, <a href="../../../../org/apache/ignite/events/ClusterTagUpdatedEvent.html" title="class in org.apache.ignite.events">ClusterTagUpdatedEvent</a>, <a href="../../../../org/apache/ignite/events/DeploymentEvent.html" title="class in org.apache.ignite.events">DeploymentEvent</a>, <a href="../../../../org/apache/ignite/events/DiscoveryEvent.html" title="class in org.apache.ignite.events">DiscoveryEvent</a>, <a href="../../../../org/apache/ignite/events/EventAdapter.html" title="class in org.apache.ignite.events">EventAdapter</a>, <a href="../../../../org/apache/ignite/events/JobEvent.html" title="class in org.apache.ignite.events">JobEvent</a>, <a href="../../../../org/apache/ignite/events/PageReplacementStartedEvent.html" title="class in org.apache.ignite.events">PageReplacementStartedEvent</a>, <a href="../../../../org/apache/ignite/events/TaskEvent.html" title="class in org.apache.ignite.events">TaskEvent</a>, <a href="../../../../org/apache/ignite/events/TransactionStateChangedEvent.html" title="class in org.apache.ignite.events">TransactionStateChangedEvent</a>, <a href="../../../../org/apache/ignite/events/WalSegmentArchivedEvent.html" title="class in org.apache.ignite.events">WalSegmentArchivedEvent</a>, <a href="../../../../org/apache/ignite/events/WalSegmentCompactedEvent.html" title="class in org.apache.ignite.events">WalSegmentCompactedEvent</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">Event</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a><span class='angle_bracket'><</span><a href="../../../../org/apache/ignite/events/Event.html" title="interface in org.apache.ignite.events">Event</a><span class='angle_bracket'>></span>, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block">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-long-int...-"><code>IgniteEvents.remoteQuery(org.apache.ignite.lang.IgnitePredicate, long, int...)</code></a> - 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-int...-"><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-int...-"><code>IgniteEvents.localListen(org.apache.ignite.lang.IgnitePredicate, int...)</code></a> - listening |
| to local grid events (events from remote nodes not included). |
| </li> |
| </ul> |
| <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 either <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. |
| <h1 class="header">Internal and Hidden Events</h1> |
| Also note that some events are considered to be internally used or hidden. |
| <p> |
| Internally used events are always "recordable" for notification purposes (regardless of whether they were |
| enabled or disabled). But won't be sent down to SPI level if user specifically excluded them. |
| <p> |
| All discovery events are internal: |
| <ul> |
| <li><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_FAILED"><code>EventType.EVT_NODE_FAILED</code></a></li> |
| <li><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_LEFT"><code>EventType.EVT_NODE_LEFT</code></a></li> |
| <li><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_JOINED"><code>EventType.EVT_NODE_JOINED</code></a></li> |
| <li><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_METRICS_UPDATED"><code>EventType.EVT_NODE_METRICS_UPDATED</code></a></li> |
| <li><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_SEGMENTED"><code>EventType.EVT_NODE_SEGMENTED</code></a></li> |
| </ul> |
| <p> |
| Hidden events are NEVER sent to SPI level. They serve purpose of local |
| notification for the local node. |
| <p> |
| Hidden events: |
| <ul> |
| <li><a href="../../../../org/apache/ignite/events/EventType.html#EVT_NODE_METRICS_UPDATED"><code>EventType.EVT_NODE_METRICS_UPDATED</code></a></li> |
| </ul></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/ignite/events/JobEvent.html" title="class in org.apache.ignite.events"><code>JobEvent</code></a>, |
| <a href="../../../../org/apache/ignite/events/CacheEvent.html" title="class in org.apache.ignite.events"><code>CacheEvent</code></a>, |
| <a href="../../../../org/apache/ignite/events/CacheRebalancingEvent.html" title="class in org.apache.ignite.events"><code>CacheRebalancingEvent</code></a>, |
| <a href="../../../../org/apache/ignite/events/CheckpointEvent.html" title="class in org.apache.ignite.events"><code>CheckpointEvent</code></a>, |
| <a href="../../../../org/apache/ignite/events/DeploymentEvent.html" title="class in org.apache.ignite.events"><code>DeploymentEvent</code></a>, |
| <a href="../../../../org/apache/ignite/events/DiscoveryEvent.html" title="class in org.apache.ignite.events"><code>DiscoveryEvent</code></a>, |
| <a href="../../../../org/apache/ignite/events/TaskEvent.html" title="class in org.apache.ignite.events"><code>TaskEvent</code></a>, |
| <a href="../../../../org/apache/ignite/IgniteEvents.html#waitForLocal-org.apache.ignite.lang.IgnitePredicate-int...-"><code>IgniteEvents.waitForLocal(org.apache.ignite.lang.IgnitePredicate, int...)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/ignite/lang/IgniteUuid.html" title="class in org.apache.ignite.lang">IgniteUuid</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#id--">id</a></span>()</code> |
| <div class="block">Gets globally unique ID of this event.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#localOrder--">localOrder</a></span>()</code> |
| <div class="block">Gets locally unique ID that is atomically incremented for each event.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>@Nullable <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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#message--">message</a></span>()</code> |
| <div class="block">Gets optional message for this event.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#name--">name</a></span>()</code> |
| <div class="block">Gets name of this event.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <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><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#node--">node</a></span>()</code> |
| <div class="block">Node where event occurred and was recorded</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#shortDisplay--">shortDisplay</a></span>()</code> |
| <div class="block">Gets a shortened version of <code>toString()</code> result.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#timestamp--">timestamp</a></span>()</code> |
| <div class="block">Gets event timestamp.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/events/Event.html#type--">type</a></span>()</code> |
| <div class="block">Gets type of this event.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Comparable"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true#compareTo-T-" title="class or interface in java.lang">compareTo</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="id--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>id</h4> |
| <pre><a href="../../../../org/apache/ignite/lang/IgniteUuid.html" title="class in org.apache.ignite.lang">IgniteUuid</a> id()</pre> |
| <div class="block">Gets globally unique ID of this event.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Globally unique ID of this event.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/ignite/events/Event.html#localOrder--"><code>localOrder()</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="localOrder--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>localOrder</h4> |
| <pre>long localOrder()</pre> |
| <div class="block">Gets locally unique ID that is atomically incremented for each event. Unlike |
| global <a href="../../../../org/apache/ignite/events/Event.html#id--"><code>id()</code></a> this local ID can be used for ordering events on this node. |
| <p> |
| Note that for performance considerations Ignite doesn't order events globally.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Locally unique ID that is atomically incremented for each new event.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/ignite/events/Event.html#id--"><code>id()</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="node--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>node</h4> |
| <pre><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a> node()</pre> |
| <div class="block">Node where event occurred and was recorded</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>node where event occurred and was recorded.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="message--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>message</h4> |
| <pre>@Nullable |
| @Nullable <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> message()</pre> |
| <div class="block">Gets optional message for this event.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Optional (can be <code>null</code>) message for this event.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="type--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>type</h4> |
| <pre>int type()</pre> |
| <div class="block">Gets type of this event. All system event types are defined in |
| <a href="../../../../org/apache/ignite/events/EventType.html" title="interface in org.apache.ignite.events"><code>EventType</code></a>. |
| <p> |
| NOTE: all types in range <b>from 1 to 1000 are reserved</b> for |
| internal Ignite events and should not be used by user-defined events.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Event's type.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/ignite/events/EventType.html" title="interface in org.apache.ignite.events"><code>EventType</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="name--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>name</h4> |
| <pre><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> name()</pre> |
| <div class="block">Gets name of this event. All events are defined in <a href="../../../../org/apache/ignite/events/EventType.html" title="interface in org.apache.ignite.events"><code>EventType</code></a> class.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Name of this event.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="timestamp--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>timestamp</h4> |
| <pre>long timestamp()</pre> |
| <div class="block">Gets event timestamp. Timestamp is local to the node on which this |
| event was produced. Note that more than one event can be generated |
| with the same timestamp. For ordering purposes use <a href="../../../../org/apache/ignite/events/Event.html#localOrder--"><code>localOrder()</code></a> instead.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Event timestamp.</dd> |
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| <h4>shortDisplay</h4> |
| <pre><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> shortDisplay()</pre> |
| <div class="block">Gets a shortened version of <code>toString()</code> result. Suitable for humans to read.</div> |
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| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Shortened version of <code>toString()</code> result.</dd> |
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