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<div class="subTitle">org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction</div>
<h2 title="Class ReadChangeStreamPartitionRangeTracker" class="title">Class ReadChangeStreamPartitionRangeTracker</h2>
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<li>java.lang.Object</li>
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<li><a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker</a>&lt;<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&gt;</li>
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<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction.TimestampRangeTracker</a></li>
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<li>org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction.ReadChangeStreamPartitionRangeTracker</li>
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<dd><a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.HasProgress.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.HasProgress</a></dd>
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<pre>public class <span class="typeNameLabel">ReadChangeStreamPartitionRangeTracker</span>
extends <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRangeTracker</a></pre>
<div class="block">This restriction tracker delegates most of its behavior to an internal <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction"><code>TimestampRangeTracker</code></a>. It has a different logic for tryClaim and trySplit methods. It ignores
claims for the same timestamp multiple times. This is because several change stream records might
have the same timestamp, thus leading to multiple claims of the same <code>Timestamp</code>. Other
than that, it always denies splits for the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/InitialPartition.html#PARTITION_TOKEN"><code>InitialPartition.PARTITION_TOKEN</code></a>, since we
only need to perform this query once.</div>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.apache.beam.sdk.transforms.splittabledofn.<a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a></h3>
<code><a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.HasProgress.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.HasProgress</a>, <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.IsBounded.html" title="enum in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.IsBounded</a>, <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.Progress.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.Progress</a>, <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.TruncateResult.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.TruncateResult</a>&lt;<a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.TruncateResult.html" title="type parameter in RestrictionTracker.TruncateResult">RestrictionT</a>&gt;</code></li>
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<code><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#lastAttemptedPosition">lastAttemptedPosition</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#lastClaimedPosition">lastClaimedPosition</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#range">range</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#timeSupplier">timeSupplier</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/ReadChangeStreamPartitionRangeTracker.html#ReadChangeStreamPartitionRangeTracker-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction.TimestampRange-">ReadChangeStreamPartitionRangeTracker</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>&nbsp;partition,
<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>&nbsp;range)</code>
<div class="block">Receives the partition that will be queried and the timestamp range that belongs to it.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/ReadChangeStreamPartitionRangeTracker.html#tryClaim-com.google.cloud.Timestamp-">tryClaim</a></span>(com.google.cloud.Timestamp&nbsp;position)</code>
<div class="block">Attempts to claim the given position.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://static.javadoc.io/org.checkerframework/checker-qual/3.27.0/org/checkerframework/checker/nullness/qual/Nullable.html?is-external=true" title="class or interface in org.checkerframework.checker.nullness.qual">@Nullable</a> <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/SplitResult.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">SplitResult</a>&lt;<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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/ReadChangeStreamPartitionRangeTracker.html#trySplit-double-">trySplit</a></span>(double&nbsp;fractionOfRemainder)</code>
<div class="block">If the partition token is the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/InitialPartition.html#PARTITION_TOKEN"><code>InitialPartition.PARTITION_TOKEN</code></a>, it does not allow for
splits (returns null).</div>
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<h3>Methods inherited from class&nbsp;org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction.<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRangeTracker</a></h3>
<code><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#checkDone--">checkDone</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#currentRestriction--">currentRestriction</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#getProgress--">getProgress</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#isBounded--">isBounded</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#setTimeSupplier-java.util.function.Supplier-">setTimeSupplier</a>, <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#tryClaim-com.google.cloud.Timestamp-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-">tryClaim</a></code></li>
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<a name="ReadChangeStreamPartitionRangeTracker-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction.TimestampRange-">
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<h4>ReadChangeStreamPartitionRangeTracker</h4>
<pre>public&nbsp;ReadChangeStreamPartitionRangeTracker(<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>&nbsp;partition,
<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>&nbsp;range)</pre>
<div class="block">Receives the partition that will be queried and the timestamp range that belongs to it.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>partition</code> - the partition that will use the tracker</dd>
<dd><code>range</code> - closed / open range interval for the start / end times of the given partition</dd>
</dl>
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<a name="tryClaim-com.google.cloud.Timestamp-">
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<h4>tryClaim</h4>
<pre>public&nbsp;boolean&nbsp;tryClaim(com.google.cloud.Timestamp&nbsp;position)</pre>
<div class="block">Attempts to claim the given position.
<p>Must be equal or larger than the last successfully claimed position.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#tryClaim-com.google.cloud.Timestamp-">tryClaim</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRangeTracker</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the position was successfully claimed, <code>false</code> if it is outside
the current <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"><code>TimestampRange</code></a> of this tracker (in that case this operation is a
no-op).</dd>
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<h4>trySplit</h4>
<pre>public&nbsp;<a href="https://static.javadoc.io/org.checkerframework/checker-qual/3.27.0/org/checkerframework/checker/nullness/qual/Nullable.html?is-external=true" title="class or interface in org.checkerframework.checker.nullness.qual">@Nullable</a> <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/SplitResult.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">SplitResult</a>&lt;<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>&gt;&nbsp;trySplit(double&nbsp;fractionOfRemainder)</pre>
<div class="block">If the partition token is the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/InitialPartition.html#PARTITION_TOKEN"><code>InitialPartition.PARTITION_TOKEN</code></a>, it does not allow for
splits (returns null).
<p>If a split is successful (non-null), then the restriction is updated to the result of the
primary.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html#trySplit-double-">trySplit</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRangeTracker</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fractionOfRemainder</code> - A hint as to the fraction of work the primary restriction should
represent based upon the current known remaining amount of work.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/SplitResult.html" title="class in org.apache.beam.sdk.transforms.splittabledofn"><code>SplitResult</code></a> if a split was possible or <code>null</code> if the <code>splitPosition</code> is beyond the end of the range.</dd>
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