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| <pre>@Documented |
| @Retention(value=RUNTIME) |
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| public static @interface <span class="memberNameLabel">DoFn.Setup</span></pre> |
| <div class="block">Annotation for the method to use to prepare an instance for processing bundles of elements. |
| |
| <p>This is a good place to initialize transient in-memory resources, such as network |
| connections. The resources can then be disposed in <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.Teardown.html" title="annotation in org.apache.beam.sdk.transforms"><code>DoFn.Teardown</code></a>. |
| |
| <p>This is <b>not</b> a good place to perform external side-effects that later need cleanup, |
| e.g. creating temporary files on distributed filesystems, starting VMs, or initiating data |
| export jobs. Such logic must be instead implemented purely via <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.StartBundle.html" title="annotation in org.apache.beam.sdk.transforms"><code>DoFn.StartBundle</code></a>, <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessElement.html" title="annotation in org.apache.beam.sdk.transforms"><code>DoFn.ProcessElement</code></a> and <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.FinishBundle.html" title="annotation in org.apache.beam.sdk.transforms"><code>DoFn.FinishBundle</code></a> methods, references to the objects requiring cleanup |
| must be passed as <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> elements, and they must be cleaned up via regular Beam |
| transforms, e.g. see the <a href="../../../../../org/apache/beam/sdk/transforms/Wait.html" title="class in org.apache.beam.sdk.transforms"><code>Wait</code></a> transform. |
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