devapidocs/org/apache/hadoop/hbase/procedure2/LockAndQueue.html - hbase-site - Git at Google

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 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.hadoop.hbase.procedure2</a></div>
 <h1 title="Class LockAndQueue" class="title">Class LockAndQueue</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
 <div class="inheritance">org.apache.hadoop.hbase.procedure2.LockAndQueue</div>
 </div>
 <section class="class-description" id="class-description">
 <dl class="notes">
 <dt>All Implemented Interfaces:</dt>
 <dd><code><a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></code></dd>
 </dl>
 <hr>
 <div class="type-signature"><span class="annotations">@Private
 </span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-48">LockAndQueue</a></span>
 <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
 implements <a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></span></div>
 <div class="block">Locking for mutual exclusion between procedures. Used only by procedure framework internally.
  <a href="LockAndQueue.html" title="class in org.apache.hadoop.hbase.procedure2"><code>LockAndQueue</code></a> has two purposes:
  <ol>
  <li>Acquire/release exclusive/shared locks.</li>
  <li>Maintains a list of procedures waiting on this lock. <a href="LockAndQueue.html" title="class in org.apache.hadoop.hbase.procedure2"><code>LockAndQueue</code></a> extends
  <a href="ProcedureDeque.html" title="class in org.apache.hadoop.hbase.procedure2"><code>ProcedureDeque</code></a> class. Blocked Procedures are added to our super Deque. Using inheritance
  over composition to keep the Deque of waiting Procedures is unusual, but we do it this way
  because in certain cases, there will be millions of regions. This layout uses less memory.
  </ol>
  <p/>
  NOT thread-safe. Needs external concurrency control: e.g. uses in MasterProcedureScheduler are
  guarded by schedLock(). <br/>
  There is no need of 'volatile' keyword for member variables because of memory synchronization
  guarantees of locks (see
  <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html">Memory
  Synchronization</a>) <br/>
  We do not implement Lock interface because we need exclusive and shared locking, and also because
  try-lock functions require procedure id. <br/>
  We do not use ReentrantReadWriteLock directly because of its high memory overhead.</div>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- =========== FIELD SUMMARY =========== -->
 <li>
 <section class="field-summary" id="field-summary">
 <h2>Field Summary</h2>
 <div class="caption"><span>Fields</span></div>
 <div class="summary-table three-column-summary">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Field</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color"><code>private <a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;</code></div>
 <div class="col-second even-row-color"><code><a href="#exclusiveLockOwnerProcedure" class="member-name-link">exclusiveLockOwnerProcedure</a></code></div>
 <div class="col-last even-row-color">&nbsp;</div>
 <div class="col-first odd-row-color"><code>private final <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Function.html" title="class or interface in java.util.function" class="external-link">Function</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html" title="class or interface in java.lang" class="external-link">Long</a>,<wbr><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&gt;</code></div>
 <div class="col-second odd-row-color"><code><a href="#procedureRetriever" class="member-name-link">procedureRetriever</a></code></div>
 <div class="col-last odd-row-color">&nbsp;</div>
 <div class="col-first even-row-color"><code>private final <a href="ProcedureDeque.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureDeque</a></code></div>
 <div class="col-second even-row-color"><code><a href="#queue" class="member-name-link">queue</a></code></div>
 <div class="col-last even-row-color">&nbsp;</div>
 <div class="col-first odd-row-color"><code>private int</code></div>
 <div class="col-second odd-row-color"><code><a href="#sharedLock" class="member-name-link">sharedLock</a></code></div>
 <div class="col-last odd-row-color">&nbsp;</div>
 </div>
 </section>
 </li>
 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
 <li>
 <section class="constructor-summary" id="constructor-summary">
 <h2>Constructor Summary</h2>
 <div class="caption"><span>Constructors</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Constructor</div>
 <div class="table-header col-last">Description</div>
 <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(java.util.function.Function)" class="member-name-link">LockAndQueue</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Function.html" title="class or interface in java.util.function" class="external-link">Function</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html" title="class or interface in java.lang" class="external-link">Long</a>,<wbr><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&gt;&nbsp;procedureRetriever)</code></div>
 <div class="col-last even-row-color">&nbsp;</div>
 </div>
 </section>
 </li>
 <!-- ========== METHOD SUMMARY =========== -->
 <li>
 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
 <div id="method-summary-table.tabpanel" role="tabpanel">
 <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#addLast(org.apache.hadoop.hbase.procedure2.Procedure)" class="member-name-link">addLast</a><wbr>(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/stream/Stream.html" title="class or interface in java.util.stream" class="external-link">Stream</a>&lt;<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#filterWaitingQueue(java.util.function.Predicate)" class="member-name-link">filterWaitingQueue</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Predicate.html" title="class or interface in java.util.function" class="external-link">Predicate</a>&lt;<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;&nbsp;predicate)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getExclusiveLockOwnerProcedure()" class="member-name-link">getExclusiveLockOwnerProcedure</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Get the procedure which holds the exclusive lock.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getSharedLockCount()" class="member-name-link">getSharedLockCount</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Get the number of procedures which hold the shared lock.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#hasExclusiveLock()" class="member-name-link">hasExclusiveLock</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Whether the exclusive lock has been held.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#hasLockAccess(org.apache.hadoop.hbase.procedure2.Procedure)" class="member-name-link">hasLockAccess</a><wbr>(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Return true if the procedure itself holds the exclusive lock, or any ancestors of the give
  procedure hold the exclusive lock.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isWaitingQueueEmpty()" class="member-name-link">isWaitingQueueEmpty</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#releaseExclusiveLock(org.apache.hadoop.hbase.procedure2.Procedure)" class="member-name-link">releaseExclusiveLock</a><wbr>(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns whether we should wake the procedures waiting on the lock here.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#releaseSharedLock()" class="member-name-link">releaseSharedLock</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns whether we should wake the procedures waiting on the lock here.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#removeFirst()" class="member-name-link">removeFirst</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#toString()" class="member-name-link">toString</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#tryExclusiveLock(org.apache.hadoop.hbase.procedure2.Procedure)" class="member-name-link">tryExclusiveLock</a><wbr>(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#trySharedLock(org.apache.hadoop.hbase.procedure2.Procedure)" class="member-name-link">trySharedLock</a><wbr>(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns whether we have succesfully acquired the shared lock.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#wakeWaitingProcedures(org.apache.hadoop.hbase.procedure2.ProcedureScheduler)" class="member-name-link">wakeWaitingProcedures</a><wbr>(<a href="ProcedureScheduler.html" title="interface in org.apache.hadoop.hbase.procedure2">ProcedureScheduler</a>&nbsp;scheduler)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
 </div>
 </div>
 </div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.procedure2.LockStatus">Methods inherited from interface&nbsp;org.apache.hadoop.hbase.procedure2.<a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></h3>
 <code><a href="LockStatus.html#describeLockStatus()">describeLockStatus</a>, <a href="LockStatus.html#getExclusiveLockProcIdOwner()">getExclusiveLockProcIdOwner</a>, <a href="LockStatus.html#isLocked()">isLocked</a></code></div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ============ FIELD DETAIL =========== -->
 <li>
 <section class="field-details" id="field-detail">
 <h2>Field Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="procedureRetriever">
 <h3>procedureRetriever</h3>
 <div class="member-signature"><span class="modifiers">private final</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Function.html" title="class or interface in java.util.function" class="external-link">Function</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html" title="class or interface in java.lang" class="external-link">Long</a>,<wbr><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-51">procedureRetriever</a></span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="queue">
 <h3>queue</h3>
 <div class="member-signature"><span class="modifiers">private final</span>&nbsp;<span class="return-type"><a href="ProcedureDeque.html" title="class in org.apache.hadoop.hbase.procedure2">ProcedureDeque</a></span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-52">queue</a></span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="exclusiveLockOwnerProcedure">
 <h3>exclusiveLockOwnerProcedure</h3>
 <div class="member-signature"><span class="modifiers">private</span>&nbsp;<span class="return-type"><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-53">exclusiveLockOwnerProcedure</a></span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="sharedLock">
 <h3>sharedLock</h3>
 <div class="member-signature"><span class="modifiers">private</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-54">sharedLock</a></span></div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ========= CONSTRUCTOR DETAIL ======== -->
 <li>
 <section class="constructor-details" id="constructor-detail">
 <h2>Constructor Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="&lt;init&gt;(java.util.function.Function)">
 <h3>LockAndQueue</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-60">LockAndQueue</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Function.html" title="class or interface in java.util.function" class="external-link">Function</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html" title="class or interface in java.lang" class="external-link">Long</a>,<wbr><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&gt;&nbsp;procedureRetriever)</span></div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="hasExclusiveLock()">
 <h3>hasExclusiveLock</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-64">hasExclusiveLock</a></span>()</div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="LockStatus.html#hasExclusiveLock()">LockStatus</a></code></span></div>
 <div class="block">Whether the exclusive lock has been held.</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="LockStatus.html#hasExclusiveLock()">hasExclusiveLock</a></code>&nbsp;in interface&nbsp;<code><a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></code></dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="hasLockAccess(org.apache.hadoop.hbase.procedure2.Procedure)">
 <h3>hasLockAccess</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-69">hasLockAccess</a></span><wbr><span class="parameters">(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</span></div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="LockStatus.html#hasLockAccess(org.apache.hadoop.hbase.procedure2.Procedure)">LockStatus</a></code></span></div>
 <div class="block">Return true if the procedure itself holds the exclusive lock, or any ancestors of the give
  procedure hold the exclusive lock.</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="LockStatus.html#hasLockAccess(org.apache.hadoop.hbase.procedure2.Procedure)">hasLockAccess</a></code>&nbsp;in interface&nbsp;<code><a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></code></dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getExclusiveLockOwnerProcedure()">
 <h3>getExclusiveLockOwnerProcedure</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-97">getExclusiveLockOwnerProcedure</a></span>()</div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="LockStatus.html#getExclusiveLockOwnerProcedure()">LockStatus</a></code></span></div>
 <div class="block">Get the procedure which holds the exclusive lock.</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="LockStatus.html#getExclusiveLockOwnerProcedure()">getExclusiveLockOwnerProcedure</a></code>&nbsp;in interface&nbsp;<code><a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></code></dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getSharedLockCount()">
 <h3>getSharedLockCount</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-102">getSharedLockCount</a></span>()</div>
 <div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="LockStatus.html#getSharedLockCount()">LockStatus</a></code></span></div>
 <div class="block">Get the number of procedures which hold the shared lock.</div>
 <dl class="notes">
 <dt>Specified by:</dt>
 <dd><code><a href="LockStatus.html#getSharedLockCount()">getSharedLockCount</a></code>&nbsp;in interface&nbsp;<code><a href="LockStatus.html" title="interface in org.apache.hadoop.hbase.procedure2">LockStatus</a></code></dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="trySharedLock(org.apache.hadoop.hbase.procedure2.Procedure)">
 <h3>trySharedLock</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-112">trySharedLock</a></span><wbr><span class="parameters">(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</span></div>
 <div class="block">Returns whether we have succesfully acquired the shared lock.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="releaseSharedLock()">
 <h3>releaseSharedLock</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-124">releaseSharedLock</a></span>()</div>
 <div class="block">Returns whether we should wake the procedures waiting on the lock here.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="tryExclusiveLock(org.apache.hadoop.hbase.procedure2.Procedure)">
 <h3>tryExclusiveLock</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-131">tryExclusiveLock</a></span><wbr><span class="parameters">(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="releaseExclusiveLock(org.apache.hadoop.hbase.procedure2.Procedure)">
 <h3>releaseExclusiveLock</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-140">releaseExclusiveLock</a></span><wbr><span class="parameters">(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</span></div>
 <div class="block">Returns whether we should wake the procedures waiting on the lock here.</div>
 </section>
 </li>
 <li>
 <section class="detail" id="isWaitingQueueEmpty()">
 <h3>isWaitingQueueEmpty</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-160">isWaitingQueueEmpty</a></span>()</div>
 </section>
 </li>
 <li>
 <section class="detail" id="removeFirst()">
 <h3>removeFirst</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-164">removeFirst</a></span>()</div>
 </section>
 </li>
 <li>
 <section class="detail" id="addLast(org.apache.hadoop.hbase.procedure2.Procedure)">
 <h3>addLast</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-168">addLast</a></span><wbr><span class="parameters">(<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&lt;?&gt;&nbsp;proc)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="wakeWaitingProcedures(org.apache.hadoop.hbase.procedure2.ProcedureScheduler)">
 <h3>wakeWaitingProcedures</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-172">wakeWaitingProcedures</a></span><wbr><span class="parameters">(<a href="ProcedureScheduler.html" title="interface in org.apache.hadoop.hbase.procedure2">ProcedureScheduler</a>&nbsp;scheduler)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="filterWaitingQueue(java.util.function.Predicate)">
 <h3>filterWaitingQueue</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/stream/Stream.html" title="class or interface in java.util.stream" class="external-link">Stream</a>&lt;<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-181">filterWaitingQueue</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Predicate.html" title="class or interface in java.util.function" class="external-link">Predicate</a>&lt;<a href="Procedure.html" title="class in org.apache.hadoop.hbase.procedure2">Procedure</a>&gt;&nbsp;predicate)</span></div>
 </section>
 </li>
 <li>
 <section class="detail" id="toString()">
 <h3>toString</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/procedure2/LockAndQueue.html#line-186">toString</a></span>()</div>
 <dl class="notes">
 <dt>Overrides:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></code></dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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