content/releases/current/javadocs/org/apache/storm/topology/StatefulBoltExecutor.html - storm-site - Git at Google

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 <div class="header">
 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.storm.topology</a></div>
 <h1 title="Class StatefulBoltExecutor" class="title">Class StatefulBoltExecutor&lt;T extends <a href="../state/State.html" title="interface in org.apache.storm.state">State</a>&gt;</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
 <div class="inheritance"><a href="BaseStatefulBoltExecutor.html" title="class in org.apache.storm.topology">org.apache.storm.topology.BaseStatefulBoltExecutor</a>
 <div class="inheritance">org.apache.storm.topology.StatefulBoltExecutor&lt;T&gt;</div>
 </div>
 </div>
 <section class="class-description" id="class-description">
 <dl class="notes">
 <dt>All Implemented Interfaces:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" class="external-link">Serializable</a></code>, <code><a href="../task/IBolt.html" title="interface in org.apache.storm.task">IBolt</a></code>, <code><a href="IComponent.html" title="interface in org.apache.storm.topology">IComponent</a></code>, <code><a href="IRichBolt.html" title="interface in org.apache.storm.topology">IRichBolt</a></code></dd>
 </dl>
 <hr>
 <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">StatefulBoltExecutor&lt;T extends <a href="../state/State.html" title="interface in org.apache.storm.state">State</a>&gt;</span>
 <span class="extends-implements">extends <a href="BaseStatefulBoltExecutor.html" title="class in org.apache.storm.topology">BaseStatefulBoltExecutor</a></span></div>
 <div class="block">Wraps a <a href="IStatefulBolt.html" title="interface in org.apache.storm.topology"><code>IStatefulBolt</code></a> and manages the state of the bolt.</div>
 <dl class="notes">
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list">
 <li><a href="../../../../serialized-form.html#org.apache.storm.topology.StatefulBoltExecutor">Serialized Form</a></li>
 </ul>
 </dd>
 </dl>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- ======== NESTED CLASS SUMMARY ======== -->
 <li>
 <section class="nested-class-summary" id="nested-class-summary">
 <h2>Nested Class Summary</h2>
 <div class="inherited-list">
 <h2 id="nested-classes-inherited-from-class-org.apache.storm.topology.BaseStatefulBoltExecutor">Nested classes/interfaces inherited from class&nbsp;org.apache.storm.topology.<a href="BaseStatefulBoltExecutor.html" title="class in org.apache.storm.topology">BaseStatefulBoltExecutor</a></h2>
 <code><a href="BaseStatefulBoltExecutor.AnchoringOutputCollector.html" title="class in org.apache.storm.topology">BaseStatefulBoltExecutor.AnchoringOutputCollector</a></code></div>
 </section>
 </li>
 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
 <li>
 <section class="constructor-summary" id="constructor-summary">
 <h2>Constructor Summary</h2>
 <div class="caption"><span>Constructors</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Constructor</div>
 <div class="table-header col-last">Description</div>
 <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(org.apache.storm.topology.IStatefulBolt)" class="member-name-link">StatefulBoltExecutor</a><wbr>(<a href="IStatefulBolt.html" title="interface in org.apache.storm.topology">IStatefulBolt</a>&lt;<a href="StatefulBoltExecutor.html" title="type parameter in StatefulBoltExecutor">T</a>&gt;&nbsp;bolt)</code></div>
 <div class="col-last even-row-color">&nbsp;</div>
 </div>
 </section>
 </li>
 <!-- ========== METHOD SUMMARY =========== -->
 <li>
 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
 <div id="method-summary-table.tabpanel" role="tabpanel">
 <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#cleanup()" class="member-name-link">cleanup</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Called when an IBolt is going to be shutdown.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)" class="member-name-link">declareOutputFields</a><wbr>(<a href="OutputFieldsDeclarer.html" title="interface in org.apache.storm.topology">OutputFieldsDeclarer</a>&nbsp;declarer)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Declare the output schema for all the streams of this topology.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getComponentConfiguration()" class="member-name-link">getComponentConfiguration</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Declare configuration specific to this component.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#handleCheckpoint(org.apache.storm.tuple.Tuple,org.apache.storm.spout.CheckPointState.Action,long)" class="member-name-link">handleCheckpoint</a><wbr>(<a href="../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a>&nbsp;checkpointTuple,
  <a href="../spout/CheckPointState.Action.html" title="enum in org.apache.storm.spout">CheckPointState.Action</a>&nbsp;action,
  long&nbsp;txid)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Sub-classes can implement the logic for handling checkpoint tuple.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#handleTuple(org.apache.storm.tuple.Tuple)" class="member-name-link">handleTuple</a><wbr>(<a href="../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a>&nbsp;input)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Sub-classes can implement the logic for handling the tuple.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)" class="member-name-link">prepare</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;&nbsp;topoConf,
  <a href="../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a>&nbsp;context,
  <a href="../task/OutputCollector.html" title="class in org.apache.storm.task">OutputCollector</a>&nbsp;collector)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Called when a task for this component is initialized within a worker on the cluster.</div>
 </div>
 </div>
 </div>
 </div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-org.apache.storm.topology.BaseStatefulBoltExecutor">Methods inherited from class&nbsp;org.apache.storm.topology.<a href="BaseStatefulBoltExecutor.html" title="class in org.apache.storm.topology">BaseStatefulBoltExecutor</a></h3>
 <code><a href="BaseStatefulBoltExecutor.html#declareCheckpointStream(org.apache.storm.topology.OutputFieldsDeclarer)">declareCheckpointStream</a>, <a href="BaseStatefulBoltExecutor.html#execute(org.apache.storm.tuple.Tuple)">execute</a>, <a href="BaseStatefulBoltExecutor.html#init(org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)">init</a></code></div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ========= CONSTRUCTOR DETAIL ======== -->
 <li>
 <section class="constructor-details" id="constructor-detail">
 <h2>Constructor Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="&lt;init&gt;(org.apache.storm.topology.IStatefulBolt)">
 <h3>StatefulBoltExecutor</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">StatefulBoltExecutor</span><wbr><span class="parameters">(<a href="IStatefulBolt.html" title="interface in org.apache.storm.topology">IStatefulBolt</a>&lt;<a href="StatefulBoltExecutor.html" title="type parameter in StatefulBoltExecutor">T</a>&gt;&nbsp;bolt)</span></div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)">
 <h3>prepare</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">prepare</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;&nbsp;topoConf,
  <a href="../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a>&nbsp;context,
  <a href="../task/OutputCollector.html" title="class in org.apache.storm.task">OutputCollector</a>&nbsp;collector)</span></div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../task/IBolt.html#prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)">IBolt</a></code></span></div>
 <div class="block">Called when a task for this component is initialized within a worker on the cluster. It provides the bolt with the environment in
  which the bolt executes.

  <p>This includes the:</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>topoConf</code> - The Storm configuration for this bolt. This is the configuration provided to the topology merged in with cluster
                   configuration on this machine.</dd>
 <dd><code>context</code> - This object can be used to get information about this task's place within the topology, including the task id and
                   component id of this task, input and output information, etc.</dd>
 <dd><code>collector</code> - The collector is used to emit tuples from this bolt. Tuples can be emitted at any time, including the prepare and
                   cleanup methods. The collector is thread-safe and should be saved as an instance variable of this bolt object.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="cleanup()">
 <h3>cleanup</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">cleanup</span>()</div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../task/IBolt.html#cleanup()">IBolt</a></code></span></div>
 <div class="block">Called when an IBolt is going to be shutdown. Storm will make a best-effort attempt to call this if the worker shutdown is orderly.
  The <a href="../Config.html#SUPERVISOR_WORKER_SHUTDOWN_SLEEP_SECS"><code>Config.SUPERVISOR_WORKER_SHUTDOWN_SLEEP_SECS</code></a> setting controls how long orderly shutdown is allowed to take.
  There is no guarantee that cleanup will be called if shutdown is not orderly, or if the shutdown exceeds the time limit.

  <p>The one context where cleanup is guaranteed to be called is when a topology is killed when running Storm in local mode.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)">
 <h3>declareOutputFields</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">declareOutputFields</span><wbr><span class="parameters">(<a href="OutputFieldsDeclarer.html" title="interface in org.apache.storm.topology">OutputFieldsDeclarer</a>&nbsp;declarer)</span></div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="IComponent.html#declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)">IComponent</a></code></span></div>
 <div class="block">Declare the output schema for all the streams of this topology.</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>declarer</code> - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getComponentConfiguration()">
 <h3>getComponentConfiguration</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;</span>&nbsp;<span class="element-name">getComponentConfiguration</span>()</div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="IComponent.html#getComponentConfiguration()">IComponent</a></code></span></div>
 <div class="block">Declare configuration specific to this component. Only a subset of the "topology.*" configs can be overridden. The component
  configuration can be further overridden when constructing the topology using <a href="TopologyBuilder.html" title="class in org.apache.storm.topology"><code>TopologyBuilder</code></a></div>
 </section>
 </li>
 <li>
 <section class="detail" id="handleCheckpoint(org.apache.storm.tuple.Tuple,org.apache.storm.spout.CheckPointState.Action,long)">
 <h3>handleCheckpoint</h3>
 <div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">handleCheckpoint</span><wbr><span class="parameters">(<a href="../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a>&nbsp;checkpointTuple,
  <a href="../spout/CheckPointState.Action.html" title="enum in org.apache.storm.spout">CheckPointState.Action</a>&nbsp;action,
  long&nbsp;txid)</span></div>
 <div class="block"><span class="descfrm-type-label">Description copied from class:&nbsp;<code><a href="BaseStatefulBoltExecutor.html#handleCheckpoint(org.apache.storm.tuple.Tuple,org.apache.storm.spout.CheckPointState.Action,long)">BaseStatefulBoltExecutor</a></code></span></div>
 <div class="block">Sub-classes can implement the logic for handling checkpoint tuple.</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="BaseStatefulBoltExecutor.html#handleCheckpoint(org.apache.storm.tuple.Tuple,org.apache.storm.spout.CheckPointState.Action,long)">handleCheckpoint</a></code>&nbsp;in class&nbsp;<code><a href="BaseStatefulBoltExecutor.html" title="class in org.apache.storm.topology">BaseStatefulBoltExecutor</a></code></dd>
 <dt>Parameters:</dt>
 <dd><code>checkpointTuple</code> - the checkpoint tuple</dd>
 <dd><code>action</code> - the action (prepare, commit, rollback or initstate)</dd>
 <dd><code>txid</code> - the transaction id.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="handleTuple(org.apache.storm.tuple.Tuple)">
 <h3>handleTuple</h3>
 <div class="member-signature"><span class="modifiers">protected</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">handleTuple</span><wbr><span class="parameters">(<a href="../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a>&nbsp;input)</span></div>
 <div class="block"><span class="descfrm-type-label">Description copied from class:&nbsp;<code><a href="BaseStatefulBoltExecutor.html#handleTuple(org.apache.storm.tuple.Tuple)">BaseStatefulBoltExecutor</a></code></span></div>
 <div class="block">Sub-classes can implement the logic for handling the tuple.</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="BaseStatefulBoltExecutor.html#handleTuple(org.apache.storm.tuple.Tuple)">handleTuple</a></code>&nbsp;in class&nbsp;<code><a href="BaseStatefulBoltExecutor.html" title="class in org.apache.storm.topology">BaseStatefulBoltExecutor</a></code></dd>
 <dt>Parameters:</dt>
 <dd><code>input</code> - the input tuple</dd>
 </dl>
 </section>
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