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| <div class="subTitle">org.apache.beam.sdk.transforms.windowing</div> |
| <h2 title="Class WindowMappingFn" class="title">Class WindowMappingFn<TargetWindowT extends <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></h2> |
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| <li>java.lang.Object</li> |
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| <li>org.apache.beam.sdk.transforms.windowing.WindowMappingFn<TargetWindowT></li> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a> |
| public abstract class <span class="typeNameLabel">WindowMappingFn<TargetWindowT extends <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></span> |
| extends java.lang.Object |
| implements java.io.Serializable</pre> |
| <div class="block"><b>Experimental! This will be ready for users eventually, but should be considered internal for |
| now. No backwards compatibility guarantees.</b> |
| |
| <p>A function that takes the windows of elements in a main input and maps them to the appropriate |
| window in a <a href="../../../../../../org/apache/beam/sdk/values/PCollectionView.html" title="interface in org.apache.beam.sdk.values"><code>PCollectionView</code></a> consumed as a <a href="../../../../../../org/apache/beam/sdk/transforms/ParDo.MultiOutput.html#withSideInputs-org.apache.beam.sdk.values.PCollectionView...-"><code>side input</code></a>.</div> |
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| <dd><a href="../../../../../../serialized-form.html#org.apache.beam.sdk.transforms.windowing.WindowMappingFn">Serialized Form</a></dd> |
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| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html#WindowMappingFn--">WindowMappingFn</a></span>()</code> |
| <div class="block">Create a new <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowMappingFn</code></a> with <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true#ZERO" title="class or interface in org.joda.time"><code>zero</code></a> maximum lookback.</div> |
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| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html#WindowMappingFn-org.joda.time.Duration-">WindowMappingFn</a></span>(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> maximumLookback)</code> |
| <div class="block">Create a new <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowMappingFn</code></a> with the specified maximum lookback.</div> |
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| <td class="colFirst"><code>abstract <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="type parameter in WindowMappingFn">TargetWindowT</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html#getSideInputWindow-org.apache.beam.sdk.transforms.windowing.BoundedWindow-">getSideInputWindow</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a> mainWindow)</code> |
| <div class="block">Returns the window of the side input corresponding to the given window of the main input.</div> |
| </td> |
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| <td class="colFirst"><code><a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html#maximumLookback--">maximumLookback</a></span>()</code> |
| <div class="block">The maximum distance between the end of any main input window <code>mainWindow</code> and the end of |
| the side input window returned by <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html#getSideInputWindow-org.apache.beam.sdk.transforms.windowing.BoundedWindow-"><code>getSideInputWindow(BoundedWindow)</code></a></div> |
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| <h4>WindowMappingFn</h4> |
| <pre>protected WindowMappingFn()</pre> |
| <div class="block">Create a new <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowMappingFn</code></a> with <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true#ZERO" title="class or interface in org.joda.time"><code>zero</code></a> maximum lookback.</div> |
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| <h4>WindowMappingFn</h4> |
| <pre>protected WindowMappingFn(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> maximumLookback)</pre> |
| <div class="block">Create a new <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowMappingFn</code></a> with the specified maximum lookback.</div> |
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| <h4>getSideInputWindow</h4> |
| <pre>public abstract <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="type parameter in WindowMappingFn">TargetWindowT</a> getSideInputWindow(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a> mainWindow)</pre> |
| <div class="block">Returns the window of the side input corresponding to the given window of the main input.</div> |
| </li> |
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| <h4>maximumLookback</h4> |
| <pre>public final <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> maximumLookback()</pre> |
| <div class="block">The maximum distance between the end of any main input window <code>mainWindow</code> and the end of |
| the side input window returned by <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html#getSideInputWindow-org.apache.beam.sdk.transforms.windowing.BoundedWindow-"><code>getSideInputWindow(BoundedWindow)</code></a> |
| |
| <p>A side input window <code>w</code> becomes unreachable when the input watermarks for all |
| consumers surpasses the timestamp: |
| |
| <p>(end of side input window) + (maximum lookback) + (main input allowed lateness). |
| |
| <p>At this point, every main input window that could map to <code>w</code> is expired.</div> |
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