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| <h2 title="Annotation Type DoFn.OnWindowExpiration" class="title">Annotation Type DoFn.OnWindowExpiration</h2> |
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| <pre>@Documented |
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| public static @interface <span class="memberNameLabel">DoFn.OnWindowExpiration</span></pre> |
| <div class="block">Annotation for the method to use for performing actions on window expiration. For example, |
| users can use this annotation to write a method that extracts a value saved in a state before |
| it gets garbage collected on window expiration. |
| |
| <p>The method annotated with <code>@OnWindowExpiration</code> may have parameters according to the |
| same logic as <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.OnTimer.html" title="annotation in org.apache.beam.sdk.transforms"><code>DoFn.OnTimer</code></a>. See the following code for an example: |
| |
| <pre><code> new DoFn<KV<Key, Foo>, Baz>() { |
| |
| @ProcessElement |
| public void processElement(ProcessContext c) { |
| } |
| |
| @OnWindowExpiration |
| public void onWindowExpiration() { |
| ... |
| } |
| }</code></pre></div> |
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