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| <div class="subTitle">org.apache.beam.sdk.io.gcp.spanner.changestreams.action</div> |
| <h2 title="Class DataChangeRecordAction" class="title">Class DataChangeRecordAction</h2> |
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| <pre>public class <span class="typeNameLabel">DataChangeRecordAction</span> |
| extends java.lang.Object</pre> |
| <div class="block">This class is part of the process for <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dofn/ReadChangeStreamPartitionDoFn.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dofn"><code>ReadChangeStreamPartitionDoFn</code></a> SDF. It is |
| responsible for processing <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>DataChangeRecord</code></a>s. The records will simply be emitted to the |
| received output receiver.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/action/DataChangeRecordAction.html#DataChangeRecordAction--">DataChangeRecordAction</a></span>()</code> </td> |
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| <td class="colFirst"><code>java.util.Optional<<a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html" title="class in org.apache.beam.sdk.transforms">DoFn.ProcessContinuation</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/action/DataChangeRecordAction.html#run-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.DataChangeRecord-org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker-org.apache.beam.sdk.transforms.DoFn.OutputReceiver-org.apache.beam.sdk.transforms.splittabledofn.ManualWatermarkEstimator-">run</a></span>(<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">PartitionMetadata</a> partition, |
| <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">DataChangeRecord</a> record, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRange.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRange</a>,com.google.cloud.Timestamp> tracker, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html" title="interface in org.apache.beam.sdk.transforms">DoFn.OutputReceiver</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">DataChangeRecord</a>> outputReceiver, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ManualWatermarkEstimator.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">ManualWatermarkEstimator</a><<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>> watermarkEstimator)</code> |
| <div class="block">This is the main processing function for a <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>DataChangeRecord</code></a>.</div> |
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| <h4>DataChangeRecordAction</h4> |
| <pre>public DataChangeRecordAction()</pre> |
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| <a name="run-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.DataChangeRecord-org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker-org.apache.beam.sdk.transforms.DoFn.OutputReceiver-org.apache.beam.sdk.transforms.splittabledofn.ManualWatermarkEstimator-"> |
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| <h4>run</h4> |
| <pre>public java.util.Optional<<a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html" title="class in org.apache.beam.sdk.transforms">DoFn.ProcessContinuation</a>> run(<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">PartitionMetadata</a> partition, |
| <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">DataChangeRecord</a> record, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRange.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRange</a>,com.google.cloud.Timestamp> tracker, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html" title="interface in org.apache.beam.sdk.transforms">DoFn.OutputReceiver</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">DataChangeRecord</a>> outputReceiver, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ManualWatermarkEstimator.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">ManualWatermarkEstimator</a><<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>> watermarkEstimator)</pre> |
| <div class="block">This is the main processing function for a <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>DataChangeRecord</code></a>. It returns an <code>Optional</code> of <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn.ProcessContinuation</code></a> to indicate if the calling function should stop or |
| not. If the <code>Optional</code> returned is empty, it means that the calling function can continue |
| with the processing. If an <code>Optional</code> of <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html#stop--"><code>DoFn.ProcessContinuation.stop()</code></a> is returned, |
| it means that this function was unable to claim the timestamp of the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>DataChangeRecord</code></a>, |
| so the caller should stop. |
| |
| <p>When processing the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>DataChangeRecord</code></a> the following procedure is applied: |
| |
| <ol> |
| <li>We try to cliam the data change record commit timestamp. If it is not possible, we stop |
| here and return. |
| <li>We emit the data change record through the <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html" title="interface in org.apache.beam.sdk.transforms"><code>DoFn.OutputReceiver</code></a>. |
| <li>We update the watermark to the data change record commit timestamp. |
| </ol></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>partition</code> - the current partition being processed</dd> |
| <dd><code>record</code> - the change stream data record received</dd> |
| <dd><code>tracker</code> - the restriction tracker of the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dofn/ReadChangeStreamPartitionDoFn.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dofn"><code>ReadChangeStreamPartitionDoFn</code></a> SDF</dd> |
| <dd><code>outputReceiver</code> - the output receiver of the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dofn/ReadChangeStreamPartitionDoFn.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dofn"><code>ReadChangeStreamPartitionDoFn</code></a> SDF</dd> |
| <dd><code>watermarkEstimator</code> - the watermark estimator of the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dofn/ReadChangeStreamPartitionDoFn.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dofn"><code>ReadChangeStreamPartitionDoFn</code></a> SDF</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>Optional.empty()</code> if the caller can continue processing more records. A non |
| empty <code>Optional</code> with <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html#stop--"><code>DoFn.ProcessContinuation.stop()</code></a> if this function was unable |
| to claim the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChildPartitionsRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ChildPartitionsRecord</code></a> timestamp</dd> |
| </dl> |
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