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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.heron.api.topology</a></div> |
| <h2 title="Interface IStatefulComponent" class="title">Interface IStatefulComponent<K extends java.io.Serializable,​V extends java.io.Serializable></h2> |
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| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="IComponent.html" title="interface in org.apache.heron.api.topology">IComponent</a></code>, <code>java.io.Serializable</code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Subinterfaces:</dt> |
| <dd><code><a href="../bolt/IStatefulWindowedBolt.html" title="interface in org.apache.heron.api.bolt">IStatefulWindowedBolt</a><K,​V></code>, <code><a href="ITwoPhaseStatefulComponent.html" title="interface in org.apache.heron.api.topology">ITwoPhaseStatefulComponent</a><K,​V></code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="../bolt/BaseStatefulWindowedBolt.html" title="class in org.apache.heron.api.bolt">BaseStatefulWindowedBolt</a></code>, <code><a href="../../streamlet/impl/sinks/ComplexSink.html" title="class in org.apache.heron.streamlet.impl.sinks">ComplexSink</a></code>, <code><a href="../../streamlet/impl/sources/ComplexSource.html" title="class in org.apache.heron.streamlet.impl.sources">ComplexSource</a></code>, <code><a href="../../spouts/kafka/KafkaSpout.html" title="class in org.apache.heron.spouts.kafka">KafkaSpout</a></code>, <code><a href="../../integration_topology_test/common/spout/StatefulABSpout.html" title="class in org.apache.heron.integration_topology_test.common.spout">StatefulABSpout</a></code>, <code><a href="../../integration_topology_test/core/StatefulBolt.html" title="class in org.apache.heron.integration_topology_test.core">StatefulBolt</a></code>, <code><a href="../../examples/eco/StatefulConsumerBolt.html" title="class in org.apache.heron.examples.eco">StatefulConsumerBolt</a></code>, <code><a href="../../integration_topology_test/common/bolt/StatefulIdentityBolt.html" title="class in org.apache.heron.integration_topology_test.common.bolt">StatefulIdentityBolt</a></code>, <code><a href="../../integration_test/core/StatefulIntegrationTestBolt.html" title="class in org.apache.heron.integration_test.core">StatefulIntegrationTestBolt</a></code>, <code><a href="../../integration_test/core/StatefulIntegrationTestSpout.html" title="class in org.apache.heron.integration_test.core">StatefulIntegrationTestSpout</a></code>, <code><a href="../../integration_topology_test/core/StatefulIntegrationTopologyTestBolt.html" title="class in org.apache.heron.integration_topology_test.core">StatefulIntegrationTopologyTestBolt</a></code>, <code><a href="../../integration_topology_test/core/StatefulIntegrationTopologyTestSpout.html" title="class in org.apache.heron.integration_topology_test.core">StatefulIntegrationTopologyTestSpout</a></code>, <code><a href="../../examples/eco/StatefulNumberSpout.html" title="class in org.apache.heron.examples.eco">StatefulNumberSpout</a></code>, <code><a href="../../examples/eco/StatefulRandomIntSpout.html" title="class in org.apache.heron.examples.eco">StatefulRandomIntSpout</a></code>, <code><a href="../../integration_topology_test/core/StatefulSpout.html" title="class in org.apache.heron.integration_topology_test.core">StatefulSpout</a></code>, <code><a href="../bolt/StatefulWindowedBoltExecutor.html" title="class in org.apache.heron.api.bolt">StatefulWindowedBoltExecutor</a></code>, <code><a href="../../integration_test/topology/windowing/stateful/StatefulWindowingTest.ConsumerBolt.html" title="class in org.apache.heron.integration_test.topology.windowing.stateful">StatefulWindowingTest.ConsumerBolt</a></code>, <code><a href="../../integration_test/topology/windowing/stateful/StatefulWindowingTest.RandomSentenceSpout.html" title="class in org.apache.heron.integration_test.topology.windowing.stateful">StatefulWindowingTest.RandomSentenceSpout</a></code>, <code><a href="../../examples/eco/StatefulWindowSumBolt.html" title="class in org.apache.heron.examples.eco">StatefulWindowSumBolt</a></code>, <code><a href="../../streamlet/impl/sources/StreamletSource.html" title="class in org.apache.heron.streamlet.impl.sources">StreamletSource</a></code>, <code><a href="../../streamlet/impl/sources/SupplierSource.html" title="class in org.apache.heron.streamlet.impl.sources">SupplierSource</a></code>, <code><a href="../../resource/TestStatefulBolt.html" title="class in org.apache.heron.resource">TestStatefulBolt</a></code>, <code><a href="../../resource/TestStatefulSpout.html" title="class in org.apache.heron.resource">TestStatefulSpout</a></code>, <code><a href="../../resource/TestTwoPhaseStatefulBolt.html" title="class in org.apache.heron.resource">TestTwoPhaseStatefulBolt</a></code>, <code><a href="../../resource/TestTwoPhaseStatefulSpout.html" title="class in org.apache.heron.resource">TestTwoPhaseStatefulSpout</a></code>, <code><a href="../../streamlet/impl/operators/TransformOperator.html" title="class in org.apache.heron.streamlet.impl.operators">TransformOperator</a></code>, <code><a href="../bolt/WindowedBoltExecutor.html" title="class in org.apache.heron.api.bolt">WindowedBoltExecutor</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">IStatefulComponent<K extends java.io.Serializable,​V extends java.io.Serializable></span> |
| extends <a href="IComponent.html" title="interface in org.apache.heron.api.topology">IComponent</a></pre> |
| <div class="block">Defines a component that saves its internal state in the State interface</div> |
| </li> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <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="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#initState(org.apache.heron.api.state.State)">initState</a></span>​(<a href="../state/State.html" title="interface in org.apache.heron.api.state">State</a><<a href="IStatefulComponent.html" title="type parameter in IStatefulComponent">K</a>,​<a href="IStatefulComponent.html" title="type parameter in IStatefulComponent">V</a>> state)</code></th> |
| <td class="colLast"> |
| <div class="block">Initializes the state of the function or operator to that of a previous checkpoint.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#preSave(java.lang.String)">preSave</a></span>​(java.lang.String checkpointId)</code></th> |
| <td class="colLast"> |
| <div class="block">This is a hook for the component to perform some actions just before the |
| framework saves its state.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a id="methods.inherited.from.class.org.apache.heron.api.topology.IComponent"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface org.apache.heron.api.topology.<a href="IComponent.html" title="interface in org.apache.heron.api.topology">IComponent</a></h3> |
| <code><a href="IComponent.html#declareOutputFields(org.apache.heron.api.topology.OutputFieldsDeclarer)">declareOutputFields</a>, <a href="IComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code></li> |
| </ul> |
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| <a id="initState(org.apache.heron.api.state.State)"> |
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| <h4>initState</h4> |
| <pre class="methodSignature">void initState​(<a href="../state/State.html" title="interface in org.apache.heron.api.state">State</a><<a href="IStatefulComponent.html" title="type parameter in IStatefulComponent">K</a>,​<a href="IStatefulComponent.html" title="type parameter in IStatefulComponent">V</a>> state)</pre> |
| <div class="block">Initializes the state of the function or operator to that of a previous checkpoint. |
| This method is invoked when a component is executed as part of a recovery run. In case |
| there was prior state associated with the component, the state will be empty. |
| Stateful Spouts/Bolts are expected to hold on to the state variable to save their |
| internal state |
| <p> |
| Note that initialState() is called before open() or prepare().</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>state</code> - the previously saved state of the component.</dd> |
| </dl> |
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| <a id="preSave(java.lang.String)"> |
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| <h4>preSave</h4> |
| <pre class="methodSignature">void preSave​(java.lang.String checkpointId)</pre> |
| <div class="block">This is a hook for the component to perform some actions just before the |
| framework saves its state.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>checkpointId</code> - the ID of the checkpoint</dd> |
| </dl> |
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