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<div class="subTitle">org.apache.gearpump.streaming.state.api</div>
<h2 title="Class PersistentTask" class="title">Class PersistentTask&lt;T&gt;</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">org.apache.gearpump.streaming.task.Task</a></li>
<li>
<ul class="inheritance">
<li>org.apache.gearpump.streaming.state.api.PersistentTask&lt;T&gt;</li>
</ul>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html" title="interface in org.apache.gearpump.streaming.task">TaskInterface</a></dd>
</dl>
<hr>
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<pre>public abstract class <span class="typeNameLabel">PersistentTask&lt;T&gt;</span>
extends <a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a></pre>
<div class="block">PersistentTask is part of the transaction API
<p>
Users should extend this task if they want to get transaction support
from the framework</div>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#PersistentTask-org.apache.gearpump.streaming.task.TaskContext-org.apache.gearpump.cluster.UserConfig-">PersistentTask</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/task/TaskContext.html" title="interface in org.apache.gearpump.streaming.task">TaskContext</a>&nbsp;taskContext,
<a href="../../../../../../org/apache/gearpump/cluster/UserConfig.html" title="class in org.apache.gearpump.cluster">UserConfig</a>&nbsp;conf)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#checkpointInterval--">checkpointInterval</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/state/impl/CheckpointManager.html" title="class in org.apache.gearpump.streaming.state.impl">CheckpointManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#checkpointManager--">checkpointManager</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/transaction/api/CheckpointStore.html" title="interface in org.apache.gearpump.streaming.transaction.api">CheckpointStore</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#checkpointStore--">checkpointStore</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/transaction/api/CheckpointStoreFactory.html" title="interface in org.apache.gearpump.streaming.transaction.api">CheckpointStoreFactory</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#checkpointStoreFactory--">checkpointStoreFactory</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentState.html" title="interface in org.apache.gearpump.streaming.state.api">PersistentState</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html" title="type parameter in PersistentTask">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#getState--">getState</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#LOG--">LOG</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#onNext-org.apache.gearpump.Message-">onNext</a></span>(<a href="../../../../../../org/apache/gearpump/Message.html" title="interface in org.apache.gearpump">Message</a>&nbsp;message)</code>
<div class="block">Method called for each message received.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#onStart-java.time.Instant-">onStart</a></span>(java.time.Instant&nbsp;startTime)</code>
<div class="block">Method called with the task is initialized.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#onStop--">onStop</a></span>()</code>
<div class="block">Method called when task is under clean up.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#onWatermarkProgress-java.time.Instant-">onWatermarkProgress</a></span>(java.time.Instant&nbsp;watermark)</code>
<div class="block">Method called on watermark update.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentState.html" title="interface in org.apache.gearpump.streaming.state.api">PersistentState</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html" title="type parameter in PersistentTask">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#persistentState--">persistentState</a></span>()</code>
<div class="block">Subclass should override this method to pass in a PersistentState.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html#processMessage-org.apache.gearpump.streaming.state.api.PersistentState-org.apache.gearpump.Message-">processMessage</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentState.html" title="interface in org.apache.gearpump.streaming.state.api">PersistentState</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html" title="type parameter in PersistentTask">T</a>&gt;&nbsp;state,
<a href="../../../../../../org/apache/gearpump/Message.html" title="interface in org.apache.gearpump">Message</a>&nbsp;message)</code>
<div class="block">Subclass should override this method to specify how a new message should update state</div>
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<h3>Methods inherited from class&nbsp;org.apache.gearpump.streaming.task.<a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a></h3>
<code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#LOG--">LOG</a>, <a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#receiveUnManagedMessage--">receiveUnManagedMessage</a>, <a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#self--">self</a>, <a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#sender--">sender</a>, <a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#system--">system</a></code></li>
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<h3>Constructor Detail</h3>
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<h4>PersistentTask</h4>
<pre>public&nbsp;PersistentTask(<a href="../../../../../../org/apache/gearpump/streaming/task/TaskContext.html" title="interface in org.apache.gearpump.streaming.task">TaskContext</a>&nbsp;taskContext,
<a href="../../../../../../org/apache/gearpump/cluster/UserConfig.html" title="class in org.apache.gearpump.cluster">UserConfig</a>&nbsp;conf)</pre>
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<a name="LOG--">
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<h4>LOG</h4>
<pre>public static&nbsp;org.slf4j.Logger&nbsp;LOG()</pre>
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<h4>checkpointStoreFactory</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/transaction/api/CheckpointStoreFactory.html" title="interface in org.apache.gearpump.streaming.transaction.api">CheckpointStoreFactory</a>&nbsp;checkpointStoreFactory()</pre>
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<h4>checkpointStore</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/transaction/api/CheckpointStore.html" title="interface in org.apache.gearpump.streaming.transaction.api">CheckpointStore</a>&nbsp;checkpointStore()</pre>
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<h4>checkpointInterval</h4>
<pre>public&nbsp;long&nbsp;checkpointInterval()</pre>
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<h4>checkpointManager</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/state/impl/CheckpointManager.html" title="class in org.apache.gearpump.streaming.state.impl">CheckpointManager</a>&nbsp;checkpointManager()</pre>
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<h4>persistentState</h4>
<pre>public abstract&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentState.html" title="interface in org.apache.gearpump.streaming.state.api">PersistentState</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html" title="type parameter in PersistentTask">T</a>&gt;&nbsp;persistentState()</pre>
<div class="block">Subclass should override this method to pass in a PersistentState. the framework has already
offered two states:
- NonWindowState: state with no time or other boundary
- WindowState: each state is bounded by a time window</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>(undocumented)</dd>
</dl>
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<a name="processMessage-org.apache.gearpump.streaming.state.api.PersistentState-org.apache.gearpump.Message-">
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<h4>processMessage</h4>
<pre>public abstract&nbsp;void&nbsp;processMessage(<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentState.html" title="interface in org.apache.gearpump.streaming.state.api">PersistentState</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html" title="type parameter in PersistentTask">T</a>&gt;&nbsp;state,
<a href="../../../../../../org/apache/gearpump/Message.html" title="interface in org.apache.gearpump">Message</a>&nbsp;message)</pre>
<div class="block">Subclass should override this method to specify how a new message should update state</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>state</code> - (undocumented)</dd>
<dd><code>message</code> - (undocumented)</dd>
</dl>
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<a name="getState--">
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<h4>getState</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentState.html" title="interface in org.apache.gearpump.streaming.state.api">PersistentState</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/state/api/PersistentTask.html" title="type parameter in PersistentTask">T</a>&gt;&nbsp;getState()</pre>
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<h4>onStart</h4>
<pre>public final&nbsp;void&nbsp;onStart(java.time.Instant&nbsp;startTime)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onStart-java.time.Instant-">TaskInterface</a></code></span></div>
<div class="block">Method called with the task is initialized.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onStart-java.time.Instant-">onStart</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html" title="interface in org.apache.gearpump.streaming.task">TaskInterface</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#onStart-java.time.Instant-">onStart</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>startTime</code> - startTime that can be used to decide from when a source producer task should
replay the data source, or from when a processor task should recover its
checkpoint data in to in-memory state.</dd>
</dl>
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<h4>onNext</h4>
<pre>public final&nbsp;void&nbsp;onNext(<a href="../../../../../../org/apache/gearpump/Message.html" title="interface in org.apache.gearpump">Message</a>&nbsp;message)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onNext-org.apache.gearpump.Message-">TaskInterface</a></code></span></div>
<div class="block">Method called for each message received.
<p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onNext-org.apache.gearpump.Message-">onNext</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html" title="interface in org.apache.gearpump.streaming.task">TaskInterface</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#onNext-org.apache.gearpump.Message-">onNext</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>message</code> - Message send by upstream tasks</dd>
</dl>
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<h4>onWatermarkProgress</h4>
<pre>public final&nbsp;void&nbsp;onWatermarkProgress(java.time.Instant&nbsp;watermark)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onWatermarkProgress-java.time.Instant-">TaskInterface</a></code></span></div>
<div class="block">Method called on watermark update.
Usually safe to output or checkpoint states earlier than watermark.
<p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onWatermarkProgress-java.time.Instant-">onWatermarkProgress</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html" title="interface in org.apache.gearpump.streaming.task">TaskInterface</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#onWatermarkProgress-java.time.Instant-">onWatermarkProgress</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>watermark</code> - represents event time progress.</dd>
</dl>
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<h4>onStop</h4>
<pre>public final&nbsp;void&nbsp;onStop()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onStop--">TaskInterface</a></code></span></div>
<div class="block">Method called when task is under clean up.
<p>
This can be used to cleanup resource when the application finished.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html#onStop--">onStop</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/TaskInterface.html" title="interface in org.apache.gearpump.streaming.task">TaskInterface</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html#onStop--">onStop</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a></code></dd>
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