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<div class="subTitle">org.apache.beam.sdk.transforms.splittabledofn</div>
<h2 title="Class OffsetRangeTracker" class="title">Class OffsetRangeTracker</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<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/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>,java.lang.Long&gt;</li>
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<li>org.apache.beam.sdk.transforms.splittabledofn.OffsetRangeTracker</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">Sizes.HasSize</a></dd>
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<pre>public class <span class="typeNameLabel">OffsetRangeTracker</span>
extends <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>,java.lang.Long&gt;
implements <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">Sizes.HasSize</a></pre>
<div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn"><code>RestrictionTracker</code></a> for claiming offsets in an <a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range"><code>OffsetRange</code></a> in a monotonically
increasing fashion.</div>
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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/transforms/splittabledofn/OffsetRangeTracker.html#OffsetRangeTracker-org.apache.beam.sdk.io.range.OffsetRange-">OffsetRangeTracker</a></span>(<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>&nbsp;range)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html#checkDone--">checkDone</a></span>()</code>
<div class="block">Called by the runner after <code>DoFn.ProcessElement</code> returns.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html#checkpoint--">checkpoint</a></span>()</code>
<div class="block">Signals that the current <code>DoFn.ProcessElement</code> call should terminate as soon as possible:
after this method returns, the tracker MUST refuse all future claim calls, and <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--"><code>RestrictionTracker.checkDone()</code></a> MUST succeed.</div>
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<td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html#currentRestriction--">currentRestriction</a></span>()</code>
<div class="block">Returns a restriction accurately describing the full range of work the current <code>DoFn.ProcessElement</code> call will do, including already completed work.</div>
</td>
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<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html#getSize--">getSize</a></span>()</code>
<div class="block">A representation for the amount of known work represented as a size.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html#toString--">toString</a></span>()</code>&nbsp;</td>
</tr>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html#tryClaim-java.lang.Long-">tryClaim</a></span>(java.lang.Long&nbsp;i)</code>
<div class="block">Attempts to claim the given offset.</div>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>OffsetRangeTracker</h4>
<pre>public&nbsp;OffsetRangeTracker(<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>&nbsp;range)</pre>
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<h4>currentRestriction</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>&nbsp;currentRestriction()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--">RestrictionTracker</a></code></span></div>
<div class="block">Returns a restriction accurately describing the full range of work the current <code>DoFn.ProcessElement</code> call will do, including already completed work.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--">currentRestriction</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>,java.lang.Long&gt;</code></dd>
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<h4>checkpoint</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>&nbsp;checkpoint()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkpoint--">RestrictionTracker</a></code></span></div>
<div class="block">Signals that the current <code>DoFn.ProcessElement</code> call should terminate as soon as possible:
after this method returns, the tracker MUST refuse all future claim calls, and <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--"><code>RestrictionTracker.checkDone()</code></a> MUST succeed.
<p>Modifies <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--"><code>RestrictionTracker.currentRestriction()</code></a>. Returns a restriction representing the rest of the
work: the old value of <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#currentRestriction--"><code>RestrictionTracker.currentRestriction()</code></a> is equivalent to the new value and the
return value of this method combined.
<p>Must be called at most once on a given object.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkpoint--">checkpoint</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>,java.lang.Long&gt;</code></dd>
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<h4>tryClaim</h4>
<pre>public&nbsp;boolean&nbsp;tryClaim(java.lang.Long&nbsp;i)</pre>
<div class="block">Attempts to claim the given offset.
<p>Must be larger than the last successfully claimed offset.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#tryClaim-PositionT-">tryClaim</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>,java.lang.Long&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the offset was successfully claimed, <code>false</code> if it is outside the
current <a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range"><code>OffsetRange</code></a> of this tracker (in that case this operation is a no-op).</dd>
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<h4>checkDone</h4>
<pre>public&nbsp;void&nbsp;checkDone()
throws java.lang.IllegalStateException</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--">RestrictionTracker</a></code></span></div>
<div class="block">Called by the runner after <code>DoFn.ProcessElement</code> returns.
<p>Must throw an exception with an informative error message, if there is still any unclaimed
work remaining in the restriction.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html#checkDone--">checkDone</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a>&lt;<a href="../../../../../../org/apache/beam/sdk/io/range/OffsetRange.html" title="class in org.apache.beam.sdk.io.range">OffsetRange</a>,java.lang.Long&gt;</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code></dd>
</dl>
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<h4>toString</h4>
<pre>public&nbsp;java.lang.String&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
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<h4>getSize</h4>
<pre>public&nbsp;double&nbsp;getSize()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html#getSize--">Sizes.HasSize</a></code></span></div>
<div class="block">A representation for the amount of known work represented as a size. Size <code>double</code>
representations should preferably represent a linear space and be comparable within the same
partition.
<p>It is up to each restriction tracker to convert between their natural representation of
outstanding work and this representation. For example:
<ul>
<li>Block based file source (e.g. Avro): From the end of the current block, the remaining
number of bytes to the end of the restriction.
<li>Pull based queue based source (e.g. Pubsub): The local/global size available in number
of messages or number of <code>message bytes</code> that have not been processed.
<li>Key range based source (e.g. Shuffle, Bigtable, ...): Scale the start key to be one and
end key to be zero and interpolate the position of the next splittable key as the size.
If information about the probability density function or cumulative distribution
function is available, size interpolation can be improved. Alternatively, if the number
of encoded bytes for the keys and values is known for the key range, the number of
remaining bytes can be used.
</ul>
<p><a href="../../../../../../org/apache/beam/sdk/transforms/DoFn.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn</code></a>s should provide a method annotated with <code>DoFn.GetPartition</code> to report a
partition identifier if the element and restriction represent the size for a shared resource
such as a message queue topic. See <code>DoFn.GetPartition</code> for additional details.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html#getSize--">getSize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/Sizes.HasSize.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">Sizes.HasSize</a></code></dd>
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