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Posted to commits@beam.apache.org by da...@apache.org on 2017/01/09 22:31:47 UTC
[12/52] [partial] beam-site git commit: Publish Javadoc for version
0.4.0
http://git-wip-us.apache.org/repos/asf/beam-site/blob/de6a0417/content/documentation/sdks/javadoc/0.4.0/org/apache/beam/runners/core/triggers/TriggerStateMachine.html
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+<!-- Generated by javadoc (1.8.0_111) on Thu Dec 29 08:19:08 CET 2016 -->
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+<title>TriggerStateMachine (Apache Beam SDK for Java, version 0.4.0)</title>
+<meta name="date" content="2016-12-29">
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+ parent.document.title="TriggerStateMachine (Apache Beam SDK for Java, version 0.4.0)";
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+var methods = {"i0":10,"i1":10,"i2":10,"i3":10,"i4":6,"i5":6,"i6":6,"i7":10,"i8":10,"i9":10,"i10":10,"i11":10,"i12":6,"i13":10,"i14":10};
+var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],4:["t3","Abstract Methods"],8:["t4","Concrete Methods"]};
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+<li><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.MergingTriggerInfo.html" title="interface in org.apache.beam.runners.core.triggers"><span class="typeNameLink">Next Class</span></a></li>
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+<li><a href="#field.summary">Field</a> | </li>
+<li><a href="#constructor.summary">Constr</a> | </li>
+<li><a href="#method.summary">Method</a></li>
+</ul>
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+<li>Detail: </li>
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+<div class="header">
+<div class="subTitle">org.apache.beam.runners.core.triggers</div>
+<h2 title="Class TriggerStateMachine" class="title">Class TriggerStateMachine</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.beam.runners.core.triggers.TriggerStateMachine</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd>
+</dl>
+<dl>
+<dt>Direct Known Subclasses:</dt>
+<dd><a href="../../../../../../org/apache/beam/runners/core/triggers/AfterEachStateMachine.html" title="class in org.apache.beam.runners.core.triggers">AfterEachStateMachine</a>, <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterWatermarkStateMachine.AfterWatermarkEarlyAndLate.html" title="class in org.apache.beam.runners.core.triggers">AfterWatermarkStateMachine.AfterWatermarkEarlyAndLate</a>, <a href="../../../../../../org/apache/beam/runners/core/triggers/DefaultTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">DefaultTriggerStateMachine</a>, <a href="../../../../../../org/apache/beam/runners/core/triggers/RepeatedlyStateMachine.html" title="class in org.apache.beam.runners.core.triggers">RepeatedlyStateMachine</a>, <a href="../../../../../../org/apache/beam/runners/core/triggers/ReshuffleTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ReshuffleTriggerStateMachine</a>, <a href="../../../../../../o
rg/apache/beam/runners/core/triggers/TriggerStateMachine.OnceTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.OnceTriggerStateMachine</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public abstract class <span class="typeNameLabel">TriggerStateMachine</span>
+extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
+implements <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre>
+<div class="block"><code>Trigger</code>s control when the elements for a specific key and window are output. As elements
+ arrive, they are put into one or more windows by a <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/Window.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Window</code></a> transform and its associated
+ <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a>, and then passed to the associated <code>Trigger</code> to determine if the <code>Window</code>s contents should be output.
+
+ <p>See <a href="../../../../../../org/apache/beam/sdk/transforms/GroupByKey.html" title="class in org.apache.beam.sdk.transforms"><code>GroupByKey</code></a> and <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/Window.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Window</code></a> for more information
+ about how grouping with windows works.
+
+ <p>The elements that are assigned to a window since the last time it was fired (or since the
+ window was created) are placed into the current window pane. Triggers are evaluated against the
+ elements as they are added. When the root trigger fires, the elements in the current pane will be
+ output. When the root trigger finishes (indicating it will never fire again), the window is
+ closed and any new elements assigned to that window are discarded.
+
+ <p>Several predefined <code>Trigger</code>s are provided:
+
+ <ul>
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterWatermarkStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>AfterWatermarkStateMachine</code></a> for firing when the watermark passes a timestamp
+ determined from either the end of the window or the arrival of the first element in a pane.
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterProcessingTimeStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>AfterProcessingTimeStateMachine</code></a> for firing after some amount of processing time has
+ elapsed (typically since the first element in a pane).
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterPaneStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>AfterPaneStateMachine</code></a> for firing off a property of the elements in the current pane,
+ such as the number of elements that have been assigned to the current pane.
+ </ul>
+
+ <p>In addition, <code>Trigger</code>s can be combined in a variety of ways:
+
+ <ul>
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/RepeatedlyStateMachine.html#forever-org.apache.beam.runners.core.triggers.TriggerStateMachine-"><code>RepeatedlyStateMachine.forever(org.apache.beam.runners.core.triggers.TriggerStateMachine)</code></a> to create a trigger that executes forever. Any time
+ its argument finishes it gets reset and starts over. Can be combined with <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#orFinally-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnceTriggerStateMachine-"><code>orFinally(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnceTriggerStateMachine)</code></a> to specify a condition that causes the repetition to stop.
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterEachStateMachine.html#inOrder-org.apache.beam.runners.core.triggers.TriggerStateMachine...-"><code>AfterEachStateMachine.inOrder(org.apache.beam.runners.core.triggers.TriggerStateMachine...)</code></a> to execute each trigger in sequence, firing each (and
+ every) time that a trigger fires, and advancing to the next trigger in the sequence when it
+ finishes.
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterFirstStateMachine.html#of-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnceTriggerStateMachine...-"><code>AfterFirstStateMachine.of(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnceTriggerStateMachine...)</code></a> to create a trigger that fires after at least one of its
+ arguments fires. An <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterFirstStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>AfterFirstStateMachine</code></a> trigger finishes after it fires once.
+ <li> <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterAllStateMachine.html#of-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnceTriggerStateMachine...-"><code>AfterAllStateMachine.of(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnceTriggerStateMachine...)</code></a> to create a trigger that fires after all least one of its
+ arguments have fired at least once. An <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterAllStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>AfterAllStateMachine</code></a> trigger finishes after it
+ fires once.
+ </ul>
+
+ <p>Each trigger tree is instantiated per-key and per-window. Every trigger in the tree is in one
+ of the following states:
+
+ <ul>
+ <li> Never Existed - before the trigger has started executing, there is no state associated with
+ it anywhere in the system. A trigger moves to the executing state as soon as it processes in
+ the current pane.
+ <li> Executing - while the trigger is receiving items and may fire. While it is in this state, it
+ may persist book-keeping information to persisted state, set timers, etc.
+ <li> Finished - after a trigger finishes, all of its book-keeping data is cleaned up, and the
+ system remembers only that it is finished. Entering this state causes us to discard any
+ elements in the buffer for that window, as well.
+ </ul>
+
+ <p>Once finished, a trigger cannot return itself back to an earlier state, however a composite
+ trigger could reset its sub-triggers.
+
+ <p>Triggers should not build up any state internally since they may be recreated between
+ invocations of the callbacks. All important values should be persisted using state before the
+ callback returns.</div>
+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../../serialized-form.html#org.apache.beam.runners.core.triggers.TriggerStateMachine">Serialized Form</a></dd>
+</dl>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ======== NESTED CLASS SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="nested.class.summary">
+<!-- -->
+</a>
+<h3>Nested Class Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Nested Class Summary table, listing nested classes, and an explanation">
+<caption><span>Nested Classes</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Class and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static interface </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.MergingTriggerInfo.html" title="interface in org.apache.beam.runners.core.triggers">TriggerStateMachine.MergingTriggerInfo</a></span></code>
+<div class="block">Interact with properties of the trigger being executed, with extensions to deal with the
+ merging windows.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static class </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.OnceTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.OnceTriggerStateMachine</a></span></code>
+<div class="block"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachine</code></a>s that are guaranteed to fire at most once should extend from this,
+ rather than the general <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachine</code></a> class to indicate that behavior.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>class </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.OnElementContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.OnElementContext</a></span></code>
+<div class="block">Extended <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerContext.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachine.TriggerContext</code></a> containing information accessible to the <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onElement-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnElementContext-"><code>onElement(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnElementContext)</code></a>
+ operational hook.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>class </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.OnMergeContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.OnMergeContext</a></span></code>
+<div class="block">Extended <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerContext.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachine.TriggerContext</code></a> containing information accessible to the <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onMerge-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext-"><code>onMerge(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext)</code></a>
+ operational hook.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>class </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.TriggerContext</a></span></code>
+<div class="block">Information accessible to all operational hooks in this <code>Trigger</code>.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static interface </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerInfo.html" title="interface in org.apache.beam.runners.core.triggers">TriggerStateMachine.TriggerInfo</a></span></code>
+<div class="block">Interface for accessing information about the trigger being executed and other triggers in the
+ same tree.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- =========== FIELD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="field.summary">
+<!-- -->
+</a>
+<h3>Field Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
+<caption><span>Fields</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Field and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine</a>></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#subTriggers">subTriggers</a></span></code> </td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor.summary">
+<!-- -->
+</a>
+<h3>Constructor Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
+<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier</th>
+<th class="colLast" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected </code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#TriggerStateMachine-java.util.List-">TriggerStateMachine</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine</a>> subTriggers)</code> </td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.summary">
+<!-- -->
+</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><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete 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>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#clear-org.apache.beam.runners.core.triggers.TriggerStateMachine.TriggerContext-">clear</a></span>(<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.TriggerContext</a> c)</code>
+<div class="block">Clear any state associated with this trigger in the given window.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#equals-java.lang.Object-">equals</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> obj)</code> </td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#hashCode--">hashCode</a></span>()</code> </td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#isCompatible-org.apache.beam.runners.core.triggers.TriggerStateMachine-">isCompatible</a></span>(<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine</a> other)</code>
+<div class="block">Returns whether this performs the same triggering as the given <code>Trigger</code>.</div>
+</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>abstract void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onElement-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnElementContext-">onElement</a></span>(<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.OnElementContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.OnElementContext</a> c)</code>
+<div class="block">Called every time an element is incorporated into a window.</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>abstract void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onFire-org.apache.beam.runners.core.triggers.TriggerStateMachine.TriggerContext-">onFire</a></span>(<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.TriggerContext</a> context)</code>
+<div class="block">Adjusts the state of the trigger to be ready for the next pane.</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>abstract void</code></td>
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+ <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine</a>> subTriggers)</pre>
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+ throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Called every time an element is incorporated into a window.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
+</dl>
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+ throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Called immediately after windows have been merged.
+
+ <p>Leaf triggers should update their state by inspecting their status and any state in the
+ merging windows. Composite triggers should update their state by calling <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html#invokeOnMerge-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext-"><code>ExecutableTriggerStateMachine.invokeOnMerge(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext)</code></a> on their sub-triggers, and applying appropriate
+ logic.
+
+ <p>A trigger such as <a href="../../../../../../org/apache/beam/runners/core/triggers/AfterWatermarkStateMachine.html#pastEndOfWindow--"><code>AfterWatermarkStateMachine.pastEndOfWindow()</code></a> may no longer be
+ finished; it is the responsibility of the trigger itself to record this fact. It is forbidden
+ for a trigger to become finished due to <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onMerge-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext-"><code>onMerge(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext)</code></a>, as it has not yet fired the pending
+ elements that led to it being ready to fire.
+
+ <p>The implementation does not need to clear out any state associated with the old windows.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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+ throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
+<div class="block">Returns <code>true</code> if the current state of the trigger indicates that its condition
+ is satisfied and it is ready to fire.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
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+<div class="block">Adjusts the state of the trigger to be ready for the next pane. For example, a
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+
+ <p>If the trigger is finished, it is the responsibility of the trigger itself to
+ record that fact via the <code>context</code>.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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+<div class="block">Called to allow the trigger to prefetch any state it will likely need to read from during
+ an <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onElement-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnElementContext-"><code>onElement(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnElementContext)</code></a> call.</div>
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+<div class="block">Called to allow the trigger to prefetch any state it will likely need to read from during
+ an <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#onMerge-org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext-"><code>onMerge(org.apache.beam.runners.core.triggers.TriggerStateMachine.OnMergeContext)</code></a> call.</div>
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+ an <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html#shouldFire-org.apache.beam.runners.core.triggers.TriggerStateMachine.TriggerContext-"><code>shouldFire(org.apache.beam.runners.core.triggers.TriggerStateMachine.TriggerContext)</code></a> call.</div>
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+<div class="block">Called to allow the trigger to prefetch any state it will likely need to read from during
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+<div class="block">Clear any state associated with this trigger in the given window.
+
+ <p>This is called after a trigger has indicated it will never fire again. The trigger system
+ keeps enough information to know that the trigger is finished, so this trigger should clear all
+ of its state.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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+<div class="block">Specify an ending condition for this trigger. If the <code>until</code> fires then the combination
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+
+ <p>The expression <code>t1.orFinally(t2)</code> fires every time <code>t1</code> fires, and finishes as
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+ seen are necessarily in the current pane.
+
+ <p>For example the final firing of the following trigger may only have 1 element:
+
+ <pre><code>
+ Repeatedly.forever(AfterPane.elementCountAtLeast(2))
+ .orFinally(AfterPane.elementCountAtLeast(5))
+ </code>
+ </pre>
+
+ <p>Note that if <code>t1</code> is <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.OnceTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachine.OnceTriggerStateMachine</code></a>, then <code>t1.orFinally(t2)</code> is
+ the same as <code>AfterFirst.of(t1, t2)</code>.</div>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
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+<div class="header">
+<div class="subTitle">org.apache.beam.runners.core.triggers</div>
+<h2 title="Class TriggerStateMachineContextFactory" class="title">Class TriggerStateMachineContextFactory<W extends <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.beam.runners.core.triggers.TriggerStateMachineContextFactory<W></li>
+</ul>
+</li>
+</ul>
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+<pre>public class <span class="typeNameLabel">TriggerStateMachineContextFactory<W extends <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></span>
+extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
+<div class="block">Factory for creating instances of the various <a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachine</code></a> contexts.
+
+ <p>These contexts are highly interdependent and share many fields; it is inadvisable
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+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineContextFactory.html#TriggerStateMachineContextFactory-org.apache.beam.sdk.transforms.windowing.WindowFn-org.apache.beam.sdk.util.state.StateInternals-org.apache.beam.sdk.util.ActiveWindowSet-">TriggerStateMachineContextFactory</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn</a><?,<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineContextFactory.html" title="type parameter in TriggerStateMachineContextFactory">W</a>> windowFn,
+ <a href="../../../../../../org/apache/beam/sdk/util/state/StateInternals.html" title="interface in org.apache.beam.sdk.util.state">StateInternals</a><?> stateInternals,
+ <a href="../../../../../../org/apache/beam/sdk/util/ActiveWindowSet.html" title="interface in org.apache.beam.sdk.util">ActiveWindowSet</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineContextFactory.html" title="type parameter in TriggerStateMachineContextFactory">W</a>> activeWindows)</code> </td>
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+<td class="colFirst"><code><a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachine.TriggerContext.html" title="class in org.apache.beam.runners.core.triggers">TriggerStateMachine.TriggerContext</a></code></td>
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+ <a href="../../../../../../org/apache/beam/sdk/util/Timers.html" title="interface in org.apache.beam.sdk.util">Timers</a> timers,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> rootTrigger,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/FinishedTriggers.html" title="interface in org.apache.beam.runners.core.triggers">FinishedTriggers</a> finishedSet)</code> </td>
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+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> trigger)</code> </td>
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+ <a href="../../../../../../org/apache/beam/sdk/util/state/StateInternals.html" title="interface in org.apache.beam.sdk.util.state">StateInternals</a><?> stateInternals,
+ <a href="../../../../../../org/apache/beam/sdk/util/ActiveWindowSet.html" title="interface in org.apache.beam.sdk.util">ActiveWindowSet</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineContextFactory.html" title="type parameter in TriggerStateMachineContextFactory">W</a>> activeWindows)</pre>
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+ <a href="../../../../../../org/apache/beam/sdk/util/Timers.html" title="interface in org.apache.beam.sdk.util">Timers</a> timers,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> rootTrigger,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/FinishedTriggers.html" title="interface in org.apache.beam.runners.core.triggers">FinishedTriggers</a> finishedSet)</pre>
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+ <a href="../../../../../../org/apache/beam/sdk/util/Timers.html" title="interface in org.apache.beam.sdk.util">Timers</a> timers,
+ org.joda.time.Instant elementTimestamp,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> rootTrigger,
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+ <a href="../../../../../../org/apache/beam/sdk/util/Timers.html" title="interface in org.apache.beam.sdk.util">Timers</a> timers,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> rootTrigger,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/FinishedTriggers.html" title="interface in org.apache.beam.runners.core.triggers">FinishedTriggers</a> finishedSet,
+ <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineContextFactory.html" title="type parameter in TriggerStateMachineContextFactory">W</a>,<a href="../../../../../../org/apache/beam/runners/core/triggers/FinishedTriggers.html" title="interface in org.apache.beam.runners.core.triggers">FinishedTriggers</a>> finishedSets)</pre>
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+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> trigger)</pre>
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+ <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineContextFactory.html" title="type parameter in TriggerStateMachineContextFactory">W</a>> mergingWindows,
+ <a href="../../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> trigger)</pre>
+</li>
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