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+<ul class="blockList"> +<li class="blockList"> +<dl> +<dt>Enclosing class:</dt> +<dd><a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core">ReduceFn</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">K</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">InputT</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">OutputT</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">W</a> extends <a href="../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></dd> +</dl> +<hr> +<br> +<pre>public abstract class <span class="typeNameLabel">ReduceFn.ProcessValueContext</span> +extends <a href="../../../../../org/apache/beam/runners/core/ReduceFn.Context.html" title="class in org.apache.beam.runners.core">ReduceFn.Context</a></pre> +<div class="block">Information accessible within <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#processValue-org.apache.beam.runners.core.ReduceFn.ProcessValueContext-"><code>ReduceFn.processValue(org.apache.beam.runners.core.ReduceFn<K, InputT, OutputT, W>.ProcessValueContext)</code></a>.</div> +</li> +</ul> +</div> +<div class="summary"> +<ul class="blockList"> +<li class="blockList"> +<!-- ======== 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="colOne" scope="col">Constructor and Description</th> +</tr> +<tr class="altColor"> +<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.ProcessValueContext.html#ProcessValueContext--">ProcessValueContext</a></span>()</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></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>abstract org.joda.time.Instant</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.ProcessValueContext.html#timestamp--">timestamp</a></span>()</code> +<div class="block">Return the timestamp associated with the value.</div> +</td> +</tr> +<tr id="i1" class="rowColor"> +<td class="colFirst"><code>abstract <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">InputT</a></code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.ProcessValueContext.html#value--">value</a></span>()</code> +<div class="block">Return the actual value being processed.</div> +</td> +</tr> +</table> +<ul class="blockList"> +<li 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class="blockList"> +<li class="blockList"> +<!-- ========= CONSTRUCTOR DETAIL ======== --> +<ul class="blockList"> +<li class="blockList"><a name="constructor.detail"> +<!-- --> +</a> +<h3>Constructor Detail</h3> +<a name="ProcessValueContext--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>ProcessValueContext</h4> +<pre>public ProcessValueContext()</pre> +</li> +</ul> +</li> +</ul> +<!-- ============ METHOD DETAIL ========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.detail"> +<!-- --> +</a> +<h3>Method Detail</h3> +<a name="value--"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>value</h4> +<pre>public abstract <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">InputT</a> value()</pre> +<div class="block">Return the actual value being processed.</div> +</li> +</ul> +<a name="timestamp--"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>timestamp</h4> +<pre>public abstract org.joda.time.Instant timestamp()</pre> +<div class="block">Return the timestamp associated with the value.</div> +</li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +</div> +<!-- ========= END OF CLASS DATA ========= --> +<!-- ======= START OF BOTTOM NAVBAR ====== --> +<div class="bottomNav"><a name="navbar.bottom"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.bottom.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a href="../../../../../overview-summary.html">Overview</a></li> +<li><a href="package-summary.html">Package</a></li> +<li class="navBarCell1Rev">Class</li> +<li><a href="class-use/ReduceFn.ProcessValueContext.html">Use</a></li> +<li><a href="package-tree.html">Tree</a></li> +<li><a href="../../../../../deprecated-list.html">Deprecated</a></li> +<li><a href="../../../../../index-all.html">Index</a></li> +<li><a 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being processed.</dd> +<dd><code>InputT</code> - The type of input values associated with the key.</dd> +<dd><code>OutputT</code> - The output type that will be produced for each key.</dd> +<dd><code>W</code> - The type of windows this operates on.</dd> +</dl> +<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/SystemReduceFn.html" title="class in org.apache.beam.runners.core">SystemReduceFn</a></dd> +</dl> +<hr> +<br> +<pre>public abstract class <span class="typeNameLabel">ReduceFn<K,InputT,OutputT,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> +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">Specification for processing to happen after elements have been grouped by key.</div> +<dl> +<dt><span class="seeLabel">See Also:</span></dt> +<dd><a href="../../../../../serialized-form.html#org.apache.beam.runners.core.ReduceFn">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>class </code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.Context.html" title="class in org.apache.beam.runners.core">ReduceFn.Context</a></span></code> +<div class="block">Information accessible to all the processing methods in this <code>ReduceFn</code>.</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/ReduceFn.OnMergeContext.html" title="class in org.apache.beam.runners.core">ReduceFn.OnMergeContext</a></span></code> +<div class="block">Information accessible within <a 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+</tr> +<tr class="altColor"> +<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#ReduceFn--">ReduceFn</a></span>()</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>abstract void</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#clearState-org.apache.beam.runners.core.ReduceFn.Context-">clearState</a></span>(<a href="../../../../../org/apache/beam/runners/core/ReduceFn.Context.html" title="class in org.apache.beam.runners.core">ReduceFn.Context</a> context)</code> +<div class="block">Called to clear any persisted state that the <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core"><code>ReduceFn</code></a> may be holding.</div> +</td> +</tr> +<tr id="i1" class="rowColor"> +<td class="colFirst"><code>abstract <a 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class="colFirst"><code>void</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#prefetchOnMerge-org.apache.beam.sdk.util.state.MergingStateAccessor-">prefetchOnMerge</a></span>(<a href="../../../../../org/apache/beam/sdk/util/state/MergingStateAccessor.html" title="interface in org.apache.beam.sdk.util.state">MergingStateAccessor</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">K</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">W</a>> c)</code> +<div class="block">Called before <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#onMerge-org.apache.beam.runners.core.ReduceFn.OnMergeContext-"><code>onMerge(org.apache.beam.runners.core.ReduceFn<K, InputT, OutputT, W>.OnMergeContext)</code></a> is invoked to provide an opportunity to prefetch any needed + state.</div> +</td> 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class="colFirst"><code>abstract void</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#processValue-org.apache.beam.runners.core.ReduceFn.ProcessValueContext-">processValue</a></span>(<a href="../../../../../org/apache/beam/runners/core/ReduceFn.ProcessValueContext.html" title="class in org.apache.beam.runners.core">ReduceFn.ProcessValueContext</a> c)</code> +<div class="block">Called for each value of type <code>InputT</code> associated with the current key.</div> +</td> +</tr> +</table> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> +<!-- --> +</a> +<h3>Methods inherited from class java.lang.<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></h3> +<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--"; 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java.lang">Exception</a></pre> +<div class="block">Called before <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#onMerge-org.apache.beam.runners.core.ReduceFn.OnMergeContext-"><code>onMerge(org.apache.beam.runners.core.ReduceFn<K, InputT, OutputT, W>.OnMergeContext)</code></a> is invoked to provide an opportunity to prefetch any needed + state.</div> +<dl> +<dt><span class="paramLabel">Parameters:</span></dt> +<dd><code>c</code> - Context to use prefetch from.</dd> +<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> +</li> +</ul> +<a name="prefetchOnTrigger-org.apache.beam.sdk.util.state.StateAccessor-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>prefetchOnTrigger</h4> +<pre>public void prefetchOnTrigger(<a 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href="../../../../../org/apache/beam/runners/core/ReduceFn.Context.html" title="class in org.apache.beam.runners.core">ReduceFn.Context</a> context) + 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 to clear any persisted state that the <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core"><code>ReduceFn</code></a> may be holding. This will be + called when the windowing is closing and will receive no future interactions.</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> +</li> +</ul> +<a name="isEmpty-org.apache.beam.sdk.util.state.StateAccessor-"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>isEmpty</h4> +<pre>public abstract <a href="../../../../../org/apache/beam/sdk/util/state/ReadableState.html" title="interface in org.apache.beam.sdk.util.state">ReadableState</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Boolean.html?is-external=true"; title="class or interface in java.lang">Boolean</a>> isEmpty(<a href="../../../../../org/apache/beam/sdk/util/state/StateAccessor.html" title="interface in org.apache.beam.sdk.util.state">StateAccessor</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="type parameter in ReduceFn">K</a>> context)</pre> +<div class="block">Returns true if the there is no buffered state.</div> +</li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +</div> +<!-- ========= END OF CLASS DATA ========= --> +<!-- ======= START OF BOTTOM NAVBAR ====== --> +<div class="bottomNav"><a name="navbar.bottom"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.bottom.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a href="../../../../../overview-summary.html">Overview</a></li> +<li><a href="package-summary.html">Package</a></li> +<li class="navBarCell1Rev">Class</li> +<li><a href="class-use/ReduceFn.html">Use</a></li> +<li><a href="package-tree.html">Tree</a></li> +<li><a href="../../../../../deprecated-list.html">Deprecated</a></li> +<li><a href="../../../../../index-all.html">Index</a></li> +<li><a href="../../../../../help-doc.html">Help</a></li> +</ul> +</div> +<div class="subNav"> +<ul class="navList"> +<li><a href="../../../../../org/apache/beam/runners/core/PushbackSideInputDoFnRunner.html" title="class in org.apache.beam.runners.core"><span class="typeNameLink">Prev Class</span></a></li> +<li><a href="../../../../../org/apache/beam/runners/core/ReduceFn.Context.html" title="class in org.apache.beam.runners.core"><span class="typeNameLink">Next Class</span></a></li> +</ul> +<ul class="navList"> +<li><a href="../../../../../index.html?org/apache/beam/runners/core/ReduceFn.html" target="_top">Frames</a></li> +<li><a href="ReduceFn.html" target="_top">No Frames</a></li> +</ul> +<ul class="navList" id="allclasses_navbar_bottom"> +<li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> +</ul> +<div> +<script type="text/javascript"><!-- + allClassesLink = document.getElementById("allclasses_navbar_bottom"); + if(window==top) { + allClassesLink.style.display = "block"; + } + else { + allClassesLink.style.display = "none"; + } + //--> +</script> +</div> +<div> +<ul class="subNavList"> +<li>Summary: </li> +<li><a href="#nested.class.summary">Nested</a> | </li> +<li>Field | </li> +<li><a href="#constructor.summary">Constr</a> | </li> +<li><a href="#method.summary">Method</a></li> +</ul> +<ul class="subNavList"> +<li>Detail: </li> +<li>Field | </li> +<li><a href="#constructor.detail">Constr</a> | </li> +<li><a href="#method.detail">Method</a></li> +</ul> +</div> +<a name="skip.navbar.bottom"> +<!-- --> +</a></div> +<!-- ======== END OF BOTTOM NAVBAR ======= --> +<p class="legalCopy"><small>Copyright © 2016–2017 <a href="https://www.apache.org/";>The Apache Software Foundation</a>. 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title="class or interface in java.lang">java.lang.Object</a></li> +<li> +<ul class="inheritance"> +<li>org.apache.beam.runners.core.ReduceFnRunner<K,InputT,OutputT,W></li> +</ul> +</li> +</ul> +<div class="description"> +<ul class="blockList"> +<li class="blockList"> +<dl> +<dt><span class="paramLabel">Type Parameters:</span></dt> +<dd><code>K</code> - The type of key being processed.</dd> +<dd><code>InputT</code> - The type of values associated with the key.</dd> +<dd><code>OutputT</code> - The output type that will be produced for each key.</dd> +<dd><code>W</code> - The type of windows this operates on.</dd> +</dl> +<hr> +<br> +<pre>public class <span class="typeNameLabel">ReduceFnRunner<K,InputT,OutputT,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">Manages the execution of a <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core"><code>ReduceFn</code></a> after a <a href="../../../../../org/apache/beam/runners/core/GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly.html" title="class in org.apache.beam.runners.core"><code>GroupByKeyViaGroupByKeyOnly.GroupByKeyOnly</code></a> has partitioned the + <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> by key. + + <p>The <a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html#onTrigger-org.apache.beam.runners.core.ReduceFn.Context-org.apache.beam.runners.core.ReduceFn.Context-boolean-boolean-"><code>onTrigger(org.apache.beam.runners.core.ReduceFn<K, InputT, OutputT, W>.Context, org.apache.beam.runners.core.ReduceFn<K, InputT, OutputT, W>.Context, boolean, boolean)</code></a> relies on a <a href="../../../../../org/apache/beam/runners/core/triggers/TriggerStateMachineRunner.html" title="class in org.apache.beam.runners.core.triggers"><code>TriggerStateMachineRunner</code></a> to manage the execution + of the triggering logic. The <code>ReduceFnRunner</code>s responsibilities are: + + <ul> + <li>Tracking the windows that are active (have buffered data) as elements arrive and triggers are + fired. + <li>Holding the watermark based on the timestamps of elements in a pane and releasing it when the + trigger fires. + <li>Calling the appropriate callbacks on <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core"><code>ReduceFn</code></a> based on trigger execution, timer + firings, etc, and providing appropriate contexts to the <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core"><code>ReduceFn</code></a> for actions such as + output. + <li>Scheduling garbage collection of state associated with a specific window, and making that + happen when the appropriate timer fires. + </ul></div> +</li> +</ul> +</div> +<div class="summary"> +<ul class="blockList"> +<li class="blockList"> +<!-- ======== 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="colOne" scope="col">Constructor and Description</th> +</tr> +<tr class="altColor"> +<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html#ReduceFnRunner-K-org.apache.beam.sdk.util.WindowingStrategy-org.apache.beam.runners.core.triggers.ExecutableTriggerStateMachine-org.apache.beam.sdk.util.state.StateInternals-org.apache.beam.sdk.util.TimerInternals-org.apache.beam.runners.core.OutputWindowedValue-org.apache.beam.sdk.util.SideInputReader-org.apache.beam.sdk.transforms.Aggregator-org.apache.beam.runners.core.ReduceFn-org.apache.beam.sdk.options.PipelineOptions-">ReduceFnRunner</a></span>(<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">K</a> key, + <a href="../../../../../org/apache/beam/sdk/util/WindowingStrategy.html" title="class in org.apache.beam.sdk.util">WindowingStrategy</a><?,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">W</a>> windowingStrategy, + <a href="../../../../../org/apache/beam/runners/core/triggers/ExecutableTriggerStateMachine.html" title="class in org.apache.beam.runners.core.triggers">ExecutableTriggerStateMachine</a> triggerStateMachine, + <a href="../../../../../org/apache/beam/sdk/util/state/StateInternals.html" title="interface in org.apache.beam.sdk.util.state">StateInternals</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">K</a>> stateInternals, + <a href="../../../../../org/apache/beam/sdk/util/TimerInternals.html" title="interface in org.apache.beam.sdk.util">TimerInternals</a> timerInternals, + <a href="../../../../../org/apache/beam/runners/core/OutputWindowedValue.html" title="interface in org.apache.beam.runners.core">OutputWindowedValue</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">K</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">OutputT</a>>> outputter, + <a href="../../../../../org/apache/beam/sdk/util/SideInputReader.html" title="interface in org.apache.beam.sdk.util">SideInputReader</a> sideInputReader, + <a href="../../../../../org/apache/beam/sdk/transforms/Aggregator.html" title="interface in org.apache.beam.sdk.transforms">Aggregator</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true"; title="class or interface in java.lang">Long</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true"; title="class or interface in java.lang">Long</a>> droppedDueToClosedWindow, + <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core">ReduceFn</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">K</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">InputT</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">OutputT</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">W</a>> reduceFn, + <a href="../../../../../org/apache/beam/sdk/options/PipelineOptions.html" title="interface in org.apache.beam.sdk.options">PipelineOptions</a> options)</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="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/ReduceFnRunner.html#onTimers-java.lang.Iterable-">onTimers</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true"; title="class or interface in java.lang">Iterable</a><<a href="../../../../../org/apache/beam/sdk/util/TimerInternals.TimerData.html" title="class in org.apache.beam.sdk.util">TimerInternals.TimerData</a>> timers)</code> </td> +</tr> +<tr id="i1" class="rowColor"> +<td class="colFirst"><code>void</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html#persist--">persist</a></span>()</code> </td> +</tr> +<tr id="i2" class="altColor"> +<td class="colFirst"><code>void</code></td> +<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html#processElements-java.lang.Iterable-">processElements</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true"; title="class or interface in java.lang">Iterable</a><<a href="../../../../../org/apache/beam/sdk/util/WindowedValue.html" title="class in org.apache.beam.sdk.util">WindowedValue</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">InputT</a>>> values)</code> +<div class="block">Incorporate <code>values</code> into the underlying reduce function, and manage holds, timers, + triggers, and window merging.</div> +</td> +</tr> +</table> +<ul class="blockList"> +<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> +<!-- --> +</a> +<h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true"; 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title="class or interface in java.lang">Long</a>,<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true"; title="class or interface in java.lang">Long</a>> droppedDueToClosedWindow, + <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html" title="class in org.apache.beam.runners.core">ReduceFn</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">K</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">InputT</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">OutputT</a>,<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">W</a>> reduceFn, + <a href="../../../../../org/apache/beam/sdk/options/PipelineOptions.html" title="interface in org.apache.beam.sdk.options">PipelineOptions</a> options)</pre> +</li> +</ul> +</li> +</ul> +<!-- ============ METHOD DETAIL ========== --> +<ul class="blockList"> +<li class="blockList"><a name="method.detail"> +<!-- --> +</a> +<h3>Method Detail</h3> +<a name="processElements-java.lang.Iterable-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>processElements</h4> +<pre>public void processElements(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true"; title="class or interface in java.lang">Iterable</a><<a href="../../../../../org/apache/beam/sdk/util/WindowedValue.html" title="class in org.apache.beam.sdk.util">WindowedValue</a><<a href="../../../../../org/apache/beam/runners/core/ReduceFnRunner.html" title="type parameter in ReduceFnRunner">InputT</a>>> values) + 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">Incorporate <code>values</code> into the underlying reduce function, and manage holds, timers, + triggers, and window merging. + + <p>The general strategy is: + <ol> + <li>Use <a href="../../../../../org/apache/beam/sdk/util/WindowedValue.html#getWindows--"><code>WindowedValue.getWindows()</code></a> (itself determined using + <a href="../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#assignWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.AssignContext-"><code>WindowFn.assignWindows(org.apache.beam.sdk.transforms.windowing.WindowFn<T, W>.AssignContext)</code></a>) to determine which windows each element belongs to. Some + of those windows will already have state associated with them. The rest are considered + NEW. + <li>Use <a href="../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#mergeWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext-"><code>WindowFn.mergeWindows(org.apache.beam.sdk.transforms.windowing.WindowFn<T, W>.MergeContext)</code></a> to attempt to merge currently ACTIVE and NEW windows. + Each NEW window will become either ACTIVE or be discardedL. + (See <a href="../../../../../org/apache/beam/runners/core/ActiveWindowSet.html" title="interface in org.apache.beam.runners.core"><code>ActiveWindowSet</code></a> for definitions of these terms.) + <li>If at all possible, eagerly substitute NEW windows with their ACTIVE state address + windows before any state is associated with the NEW window. In the common case that + windows for new elements are merged into existing ACTIVE windows then no additional + storage or merging overhead will be incurred. + <li>Otherwise, keep track of the state address windows for ACTIVE windows so that their + states can be merged on-demand when a pane fires. + <li>Process the element for each of the windows it's windows have been merged into according + to <a href="../../../../../org/apache/beam/runners/core/ActiveWindowSet.html" title="interface in org.apache.beam.runners.core"><code>ActiveWindowSet</code></a>. Processing may require running triggers, setting timers, + setting holds, and invoking <a href="../../../../../org/apache/beam/runners/core/ReduceFn.html#onTrigger-org.apache.beam.runners.core.ReduceFn.OnTriggerContext-"><code>ReduceFn.onTrigger(org.apache.beam.runners.core.ReduceFn<K, InputT, OutputT, W>.OnTriggerContext)</code></a>. + </ol></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> +</li> +</ul> +<a name="persist--"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>persist</h4> +<pre>public void persist()</pre> +</li> +</ul> +<a name="onTimers-java.lang.Iterable-"> +<!-- --> +</a> +<ul class="blockListLast"> +<li class="blockList"> +<h4>onTimers</h4> +<pre>public void onTimers(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true"; title="class or interface in java.lang">Iterable</a><<a href="../../../../../org/apache/beam/sdk/util/TimerInternals.TimerData.html" title="class in org.apache.beam.sdk.util">TimerInternals.TimerData</a>> timers) + 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> +<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> +</li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +</div> +<!-- ========= END OF CLASS DATA ========= --> +<!-- ======= START OF BOTTOM NAVBAR ====== --> +<div class="bottomNav"><a name="navbar.bottom"> +<!-- --> +</a> +<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> +<a name="navbar.bottom.firstrow"> +<!-- --> +</a> +<ul class="navList" title="Navigation"> +<li><a href="../../../../../overview-summary.html">Overview</a></li> +<li><a href="package-summary.html">Package</a></li> +<li class="navBarCell1Rev">Class</li> +<li><a href="class-use/ReduceFnRunner.html">Use</a></li> +<li><a href="package-tree.html">Tree</a></li> +<li><a href="../../../../../deprecated-list.html">Deprecated</a></li> +<li><a href="../../../../../index-all.html">Index</a></li> +<li><a href="../../../../../help-doc.html">Help</a></li> +</ul> +</div> +<div class="subNav"> +<ul class="navList"> +<li><a href="../../../../../org/apache/beam/runners/core/ReduceFn.ProcessValueContext.html" title="class in org.apache.beam.runners.core"><span class="typeNameLink">Prev Class</span></a></li> +<li><a href="../../../../../org/apache/beam/runners/core/SideInputHandler.html" title="class in org.apache.beam.runners.core"><span class="typeNameLink">Next Class</span></a></li> +</ul> +<ul class="navList"> +<li><a href="../../../../../index.html?org/apache/beam/runners/core/ReduceFnRunner.html" target="_top">Frames</a></li> +<li><a href="ReduceFnRunner.html" target="_top">No Frames</a></li> +</ul> +<ul class="navList" id="allclasses_navbar_bottom"> +<li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> +</ul> +<div> +<script type="text/javascript"><!-- + allClassesLink = document.getElementById("allclasses_navbar_bottom"); + if(window==top) { + allClassesLink.style.display = "block"; + } + else { + allClassesLink.style.display = "none"; + } + //--> +</script> +</div> +<div> +<ul class="subNavList"> +<li>Summary: </li> +<li>Nested | </li> +<li>Field | </li> +<li><a href="#constructor.summary">Constr</a> | </li> +<li><a href="#method.summary">Method</a></li> +</ul> +<ul class="subNavList"> +<li>Detail: </li> +<li>Field | </li> +<li><a href="#constructor.detail">Constr</a> | </li> +<li><a href="#method.detail">Method</a></li> +</ul> +</div> +<a name="skip.navbar.bottom"> +<!-- --> +</a></div> +<!-- ======== END OF BOTTOM NAVBAR ======= --> +<p class="legalCopy"><small>Copyright © 2016–2017 <a href="https://www.apache.org/";>The Apache Software Foundation</a>. 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