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| <h2 title="Interface ReadableState" class="title">Interface ReadableState<T></h2> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../../org/apache/beam/sdk/state/BagState.html" title="interface in org.apache.beam.sdk.state">BagState</a><T>, <a href="../../../../../org/apache/beam/sdk/state/CombiningState.html" title="interface in org.apache.beam.sdk.state">CombiningState</a><InputT,AccumT,OutputT>, <a href="../../../../../org/apache/beam/sdk/state/GroupingState.html" title="interface in org.apache.beam.sdk.state">GroupingState</a><InputT,OutputT>, <a href="../../../../../org/apache/beam/sdk/state/SetState.html" title="interface in org.apache.beam.sdk.state">SetState</a><T>, <a href="../../../../../org/apache/beam/sdk/state/ValueState.html" title="interface in org.apache.beam.sdk.state">ValueState</a><T>, <a href="../../../../../org/apache/beam/sdk/state/WatermarkHoldState.html" title="interface in org.apache.beam.sdk.state">WatermarkHoldState</a></dd> |
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| <pre><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 interface <span class="typeNameLabel">ReadableState<T></span></pre> |
| <div class="block">A <a href="../../../../../org/apache/beam/sdk/state/State.html" title="interface in org.apache.beam.sdk.state"><code>State</code></a> that can be read via <a href="../../../../../org/apache/beam/sdk/state/ReadableState.html#read--"><code>read()</code></a>. |
| |
| <p>Use <a href="../../../../../org/apache/beam/sdk/state/ReadableState.html#readLater--"><code>readLater()</code></a> for marking several states for prefetching. Runners can potentially |
| batch these into one read.</div> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="type parameter in ReadableState">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/state/ReadableState.html#read--">read</a></span>()</code> |
| <div class="block">Read the current value, blocking until it is available.</div> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="interface in org.apache.beam.sdk.state">ReadableState</a><<a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="type parameter in ReadableState">T</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/state/ReadableState.html#readLater--">readLater</a></span>()</code> |
| <div class="block">Indicate that the value will be read later.</div> |
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| <h4>read</h4> |
| <pre><a href="https://static.javadoc.io/com.google.code.findbugs/jsr305/3.0.2/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="type parameter in ReadableState">T</a> read()</pre> |
| <div class="block">Read the current value, blocking until it is available. |
| |
| <p>If there will be many calls to <a href="../../../../../org/apache/beam/sdk/state/ReadableState.html#read--"><code>read()</code></a> for different state in short succession, you |
| should first call <a href="../../../../../org/apache/beam/sdk/state/ReadableState.html#readLater--"><code>readLater()</code></a> for all of them so the reads can potentially be batched |
| (depending on the underlying implementation}. |
| |
| <p>The returned object should be independent of the underlying state. Any direct modification |
| of the returned object should not modify state without going through the appropriate state |
| interface, and modification to the state should not be mirrored in the returned object.</div> |
| </li> |
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| <h4>readLater</h4> |
| <pre><a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="interface in org.apache.beam.sdk.state">ReadableState</a><<a href="../../../../../org/apache/beam/sdk/state/ReadableState.html" title="type parameter in ReadableState">T</a>> readLater()</pre> |
| <div class="block">Indicate that the value will be read later. |
| |
| <p>This allows an implementation to start an asynchronous prefetch or to include this state in |
| the next batch of reads.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>this for convenient chaining</dd> |
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