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| <h2 title="Annotation Type DoFn.AlwaysFetched" class="title">Annotation Type DoFn.AlwaysFetched</h2> |
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| <pre>@Documented |
| @Retention(value=RUNTIME) |
| @Target(value={FIELD,PARAMETER}) |
| <a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#STATE">STATE</a>) |
| public static @interface <span class="memberNameLabel">DoFn.AlwaysFetched</span></pre> |
| <div class="block">Annotation for declaring that a state parameter is always fetched. |
| |
| <p>A DoFn might not fetch a state value on every element, and for that reason runners may |
| choose to defer fetching state until read() is called. Annotating a state argument with this |
| parameter provides a hint to the runner that the state is always fetched. This may cause the |
| runner to prefetch all the state before calling the processElement or processTimer method, |
| improving performance. This is a performance-only hint - it does not change semantics. See the |
| following code for an example: |
| |
| <pre><code> new DoFn<KV<Key, Foo>, Baz>() { |
| |
| @StateId("my-state-id") |
| private final StateSpec<ValueState<MyState>> myStateSpec = |
| StateSpecs.value(new MyStateCoder()); |
| |
| @ProcessElement |
| public void processElement( |
| @Element InputT element, |
| @AlwaysFetched @StateId("my-state-id") ValueState<MyState> myState) { |
| myState.read(); |
| myState.write(...); |
| } |
| } |
| </code></pre> |
| |
| <p>This can only be used on state objects that implement <a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="interface in org.apache.beam.sdk.state"><code>ReadableState</code></a>.</div> |
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