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| <h2 title="Annotation Type DoFn.StartBundle" class="title">Annotation Type DoFn.StartBundle</h2> |
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| <pre>@Documented |
| @Retention(value=RUNTIME) |
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| public static @interface <span class="memberNameLabel">DoFn.StartBundle</span></pre> |
| <div class="block">Annotation for the method to use to prepare an instance for processing a batch of elements. The |
| method annotated with this must satisfy the following constraints: |
| |
| <ul> |
| <li>If one of the parameters is of type <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.StartBundleContext.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn.StartBundleContext</code></a>, then it will be |
| passed a context object for the current execution. |
| <li>If one of the parameters is of type <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.BundleFinalizer.html" title="interface in org.apache.beam.sdk.transforms"><code>DoFn.BundleFinalizer</code></a>, then it will be passed a |
| mechanism to register a callback that will be invoked after the runner successfully |
| commits the output of this bundle. See <a |
| href="https://s.apache.org/beam-finalizing-bundles">Apache Beam Portability API: How to |
| Finalize Bundles</a> for further details. |
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