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| <div class="subTitle">org.apache.hadoop.hbase.regionserver</div> |
| <h2 title="Class ScannerContext" class="title">Class ScannerContext</h2> |
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| <ul class="inheritance"> |
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| <ul class="inheritance"> |
| <li>org.apache.hadoop.hbase.regionserver.ScannerContext</li> |
| </ul> |
| </li> |
| </ul> |
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| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/NoLimitScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver">NoLimitScannerContext</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.LimitedPrivate(value="Coprocesssor") |
| @InterfaceStability.Evolving |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerContext.html#line.53">ScannerContext</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">ScannerContext instances encapsulate limit tracking AND progress towards those limits during |
| invocations of <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> and |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a>. |
| <p> |
| A ScannerContext instance should be updated periodically throughout execution whenever progress |
| towards a limit has been made. Each limit can be checked via the appropriate checkLimit method. |
| <p> |
| Once a limit has been reached, the scan will stop. The invoker of |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> or <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> can |
| use the appropriate check*Limit methods to see exactly which limits have been reached. |
| Alternatively, <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#checkAnyLimitReached-org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope-"><code>checkAnyLimitReached(LimitScope)</code></a> is provided to see if ANY limit was |
| reached |
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| <a href="../../../../../org/apache/hadoop/hbase/regionserver/NoLimitScannerContext.html#NO_LIMIT"><code>NoLimitScannerContext.NO_LIMIT</code></a> is an immutable static definition that can be used |
| whenever a <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ScannerContext</code></a> is needed but limits do not need to be enforced. |
| <p> |
| NOTE: It is important that this class only ever expose setter methods that can be safely skipped |
| when limits should be NOT enforced. This is because of the necessary immutability of the class |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/NoLimitScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>NoLimitScannerContext</code></a>. If a setter cannot be safely skipped, the immutable nature of |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/NoLimitScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>NoLimitScannerContext</code></a> will lead to incorrect behavior.</div> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.Builder.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext.Builder</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitFields.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitFields</a></span></code> |
| <div class="block">The different fields that can be used as limits in calls to |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> and <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a></div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitScope.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitScope</a></span></code> |
| <div class="block">The various scopes where a limit can be enforced.</div> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.NextState.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.NextState</a></span></code> |
| <div class="block">The possible states a scanner may be in following a call to <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(List)</code></a></div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.ProgressFields.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext.ProgressFields</a></span></code> </td> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#DEFAULT_KEEP_PROGRESS">DEFAULT_KEEP_PROGRESS</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.NextState.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.NextState</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#DEFAULT_STATE">DEFAULT_STATE</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#keepProgress">keepProgress</a></span></code> |
| <div class="block">Used as an indication to invocations of <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> and |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> that, if true, the progress tracked within this |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html" title="class in org.apache.hadoop.hbase.regionserver"><code>ScannerContext</code></a> instance should be considered while evaluating the limits.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#lastPeekedCell">lastPeekedCell</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitFields.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitFields</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#limits">limits</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/client/metrics/ServerSideScanMetrics.html" title="class in org.apache.hadoop.hbase.client.metrics">ServerSideScanMetrics</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#metrics">metrics</a></span></code> |
| <div class="block">Tracks the relevant server side metrics during scans.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.ProgressFields.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext.ProgressFields</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#progress">progress</a></span></code> |
| <div class="block">A different set of progress fields.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#returnImmediately">returnImmediately</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.NextState.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.NextState</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#scannerState">scannerState</a></span></code> |
| <div class="block">The state of the scanner after the invocation of <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a> |
| or <a href="../../../../../org/apache/hadoop/hbase/regionserver/InternalScanner.html#next-java.util.List-"><code>InternalScanner.next(java.util.List)</code></a>.</div> |
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| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <h3>Constructor Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#ScannerContext-boolean-org.apache.hadoop.hbase.regionserver.ScannerContext.LimitFields-boolean-">ScannerContext</a></span>(boolean keepProgress, |
| <a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitFields.html" title="class in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitFields</a> limitsToCopy, |
| boolean trackMetrics)</code> </td> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#checkAnyLimitReached-org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope-">checkAnyLimitReached</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitScope.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitScope</a> checkerScope)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#checkBatchLimit-org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope-">checkBatchLimit</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitScope.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitScope</a> checkerScope)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#checkSizeLimit-org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope-">checkSizeLimit</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitScope.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitScope</a> checkerScope)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#checkTimeLimit-org.apache.hadoop.hbase.regionserver.ScannerContext.LimitScope-">checkTimeLimit</a></span>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitScope.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitScope</a> checkerScope)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#clearProgress--">clearProgress</a></span>()</code> |
| <div class="block">Clear away any progress that has been made so far.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>(package private) int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getBatchLimit--">getBatchLimit</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>(package private) int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getBatchProgress--">getBatchProgress</a></span>()</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getDataSizeLimit--">getDataSizeLimit</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getDataSizeProgress--">getDataSizeProgress</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getHeapSizeProgress--">getHeapSizeProgress</a></span>()</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getKeepProgress--">getKeepProgress</a></span>()</code> </td> |
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| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getLastPeekedCell--">getLastPeekedCell</a></span>()</code> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/client/metrics/ServerSideScanMetrics.html" title="class in org.apache.hadoop.hbase.client.metrics">ServerSideScanMetrics</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.html#getMetrics--">getMetrics</a></span>()</code> |
| <div class="block">Get the metrics instance.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
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| <dd><code>checkerScope</code> - </dd> |
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| <dd>true if the batch limit can be enforced in the checker's scope</dd> |
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| <dd><code>checkerScope</code> - </dd> |
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| <dd>true if the size limit can be enforced in the checker's scope</dd> |
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| <dd>true if the time limit can be enforced in the checker's scope</dd> |
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| <dd>true if any limit can be enforced within the checker's scope</dd> |
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| <dd><code>scope</code> - The scope in which the size limit will be enforced</dd> |
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| <pre>void <a href="../../../../../src-html/org/apache/hadoop/hbase/regionserver/ScannerContext.html#line.279">setTimeLimitScope</a>(<a href="../../../../../org/apache/hadoop/hbase/regionserver/ScannerContext.LimitScope.html" title="enum in org.apache.hadoop.hbase.regionserver">ScannerContext.LimitScope</a> scope)</pre> |
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| <dd><code>scope</code> - The scope in which the time limit will be enforced</dd> |
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| <dd><code>checkerScope</code> - The scope that the limit is being checked from</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the limit is enforceable from the checker's scope and it has been reached</dd> |
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| <dd><code>checkerScope</code> - The scope that the limit is being checked from</dd> |
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| <dd>true when the limit is enforceable from the checker's scope and it has been reached</dd> |
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| <dd><code>checkerScope</code> - The scope that the limit is being checked from. The time limit is always |
| checked against <code>EnvironmentEdgeManager.currentTime</code></dd> |
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| <dd>true when the limit is enforceable from the checker's scope and it has been reached</dd> |
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| <dd><code>checkerScope</code> - The scope that the limits are being checked from</dd> |
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| <dd>true when some limit is enforceable from the checker's scope and it has been reached</dd> |
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| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code> in class <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd> |
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