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| <li>Summary: </li> |
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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.storm.hooks</a></div> |
| <h1 title="Interface IWorkerHook" class="title">Interface IWorkerHook</h1> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Superinterfaces:</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></dd> |
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| <dl class="notes"> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="BaseWorkerHook.html" title="class in org.apache.storm.hooks">BaseWorkerHook</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">IWorkerHook</span><span class="extends-implements"> |
| extends <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></span></div> |
| <div class="block">An IWorkerHook represents a topology component that can be executed when a worker starts, and when a worker shuts down. It can be useful |
| when you want to execute operations before topology processing starts, or cleanup operations before your workers shut down.</div> |
| </section> |
| <section class="summary"> |
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| <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-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#shutdown()" class="member-name-link">shutdown</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">This method is called right before a worker shuts down.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5 method-summary-table-tab6"><code>default void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5 method-summary-table-tab6"><code><a href="#start(java.util.Map,org.apache.storm.task.WorkerTopologyContext)" class="member-name-link">start</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><<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>> topoConf, |
| <a href="../task/WorkerTopologyContext.html" title="class in org.apache.storm.task">WorkerTopologyContext</a> context)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5 method-summary-table-tab6"> |
| <div class="block"><span class="deprecated-label">Deprecated.</span> |
| <div class="deprecation-comment">see <a href="#start(java.util.Map,org.apache.storm.task.WorkerUserContext)"><code>start(Map, WorkerUserContext)</code></a></div> |
| </div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code>default void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"><code><a href="#start(java.util.Map,org.apache.storm.task.WorkerUserContext)" class="member-name-link">start</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><<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>> topoConf, |
| <a href="../task/WorkerUserContext.html" title="class in org.apache.storm.task">WorkerUserContext</a> context)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab5"> |
| <div class="block">This method is called when a worker is started and can be used to do necessary prep-processing and allow initialization of shared |
| application state.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="start(java.util.Map,org.apache.storm.task.WorkerTopologyContext)"> |
| <h3>start</h3> |
| <div class="member-signature"><span class="modifiers">default</span> <span class="return-type">void</span> <span class="element-name">start</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><<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>> topoConf, |
| <a href="../task/WorkerTopologyContext.html" title="class in org.apache.storm.task">WorkerTopologyContext</a> context)</span></div> |
| <div class="deprecation-block"><span class="deprecated-label">Deprecated.</span> |
| <div class="deprecation-comment">see <a href="#start(java.util.Map,org.apache.storm.task.WorkerUserContext)"><code>start(Map, WorkerUserContext)</code></a></div> |
| </div> |
| <div class="block">This method is called when a worker is started.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>topoConf</code> - The Storm configuration for this worker</dd> |
| <dd><code>context</code> - This object can be used to get information about this worker's place within the topology</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="start(java.util.Map,org.apache.storm.task.WorkerUserContext)"> |
| <h3>start</h3> |
| <div class="member-signature"><span class="modifiers">default</span> <span class="return-type">void</span> <span class="element-name">start</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><<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>> topoConf, |
| <a href="../task/WorkerUserContext.html" title="class in org.apache.storm.task">WorkerUserContext</a> context)</span></div> |
| <div class="block">This method is called when a worker is started and can be used to do necessary prep-processing and allow initialization of shared |
| application state.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>topoConf</code> - The Storm configuration for this worker</dd> |
| <dd><code>context</code> - This object can be used to get information about this worker's place within the topology and exposes |
| <a href="../task/WorkerUserContext.html#setResource(java.lang.String,java.lang.Object)"><code>WorkerUserContext.setResource(String, Object)</code></a> to set the shared application state.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="shutdown()"> |
| <h3>shutdown</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name">shutdown</span>()</div> |
| <div class="block">This method is called right before a worker shuts down.</div> |
| </section> |
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