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+<title>SessionTracker (Apache ZooKeeper - Server 3.8.1 API)</title>
+<meta name="date" content="2023-01-25">
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+<li><a href="package-summary.html">Package</a></li>
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+<li>Summary:&nbsp;</li>
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+<li>Field&nbsp;|&nbsp;</li>
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+<li><a href="#method.summary">Method</a></li>
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+<li>Detail:&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.zookeeper.server</div>
+<h2 title="Interface SessionTracker" class="title">Interface SessionTracker</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Known Implementing Classes:</dt>
+<dd><a href="../../../../org/apache/zookeeper/server/quorum/LeaderSessionTracker.html" title="class in org.apache.zookeeper.server.quorum">LeaderSessionTracker</a>, <a href="../../../../org/apache/zookeeper/server/quorum/LearnerSessionTracker.html" title="class in org.apache.zookeeper.server.quorum">LearnerSessionTracker</a>, <a href="../../../../org/apache/zookeeper/server/quorum/LocalSessionTracker.html" title="class in org.apache.zookeeper.server.quorum">LocalSessionTracker</a>, <a href="../../../../org/apache/zookeeper/server/SessionTrackerImpl.html" title="class in org.apache.zookeeper.server">SessionTrackerImpl</a>, <a href="../../../../org/apache/zookeeper/server/quorum/UpgradeableSessionTracker.html" title="class in org.apache.zookeeper.server.quorum">UpgradeableSessionTracker</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public interface <span class="typeNameLabel">SessionTracker</span></pre>
+<div class="block">This is the basic interface that ZooKeeperServer uses to track sessions. The
+ standalone and leader ZooKeeperServer use the same SessionTracker. The
+ FollowerZooKeeperServer uses a SessionTracker which is basically a simple
+ shell to track information to be forwarded to the leader.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ======== NESTED CLASS SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="nested.class.summary">
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+</a>
+<h3>Nested Class Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Nested Class Summary table, listing nested classes, and an explanation">
+<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Interface and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static interface&nbsp;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.Session.html" title="interface in org.apache.zookeeper.server">SessionTracker.Session</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static interface&nbsp;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.SessionExpirer.html" title="interface in org.apache.zookeeper.server">SessionTracker.SessionExpirer</a></span></code>&nbsp;</td>
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+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
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+<li class="blockList"><a name="method.summary">
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+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</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>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#checkGlobalSession-long-java.lang.Object-">checkGlobalSession</a></span>(long&nbsp;sessionId,
+ <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>&nbsp;owner)</code>
+<div class="block">Strictly check that a given session is a global session or not</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#checkSession-long-java.lang.Object-">checkSession</a></span>(long&nbsp;sessionId,
+ <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>&nbsp;owner)</code>
+<div class="block">Checks whether the SessionTracker is aware of this session, the session
+ is still active, and the owner matches.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#commitSession-long-int-">commitSession</a></span>(long&nbsp;id,
+ int&nbsp;to)</code>
+<div class="block">Add the session to the local session map or global one in zkDB.</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#createSession-int-">createSession</a></span>(int&nbsp;sessionTimeout)</code>&nbsp;</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#dumpSessions-java.io.PrintWriter-">dumpSessions</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/PrintWriter.html?is-external=true" title="class or interface in java.io">PrintWriter</a>&nbsp;pwriter)</code>
+<div class="block">Text dump of session information, suitable for debugging.</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#getLocalSessionCount--">getLocalSessionCount</a></span>()</code>
+<div class="block">If this session tracker supports local sessions, return how many.</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#getSessionExpiryMap--">getSessionExpiryMap</a></span>()</code>
+<div class="block">Returns a mapping of time to session IDs that expire at that time.</div>
+</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#globalSessions--">globalSessions</a></span>()</code>
+<div class="block">Get a set of global session IDs</div>
+</td>
+</tr>
+<tr id="i8" class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#isLocalSessionsEnabled--">isLocalSessionsEnabled</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i9" class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#isTrackingSession-long-">isTrackingSession</a></span>(long&nbsp;sessionId)</code>&nbsp;</td>
+</tr>
+<tr id="i10" class="altColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#localSessions--">localSessions</a></span>()</code>
+<div class="block">Get a set of local session IDs</div>
+</td>
+</tr>
+<tr id="i11" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#removeSession-long-">removeSession</a></span>(long&nbsp;sessionId)</code>&nbsp;</td>
+</tr>
+<tr id="i12" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#setOwner-long-java.lang.Object-">setOwner</a></span>(long&nbsp;id,
+ <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>&nbsp;owner)</code>&nbsp;</td>
+</tr>
+<tr id="i13" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#setSessionClosing-long-">setSessionClosing</a></span>(long&nbsp;sessionId)</code>
+<div class="block">Mark that the session is in the process of closing.</div>
+</td>
+</tr>
+<tr id="i14" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#shutdown--">shutdown</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i15" class="rowColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#touchSession-long-int-">touchSession</a></span>(long&nbsp;sessionId,
+ int&nbsp;sessionTimeout)</code>&nbsp;</td>
+</tr>
+<tr id="i16" class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/zookeeper/server/SessionTracker.html#trackSession-long-int-">trackSession</a></span>(long&nbsp;id,
+ int&nbsp;to)</code>
+<div class="block">Track the session expire, not add to ZkDb.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.detail">
+<!-- -->
+</a>
+<h3>Method Detail</h3>
+<a name="createSession-int-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>createSession</h4>
+<pre>long&nbsp;createSession(int&nbsp;sessionTimeout)</pre>
+</li>
+</ul>
+<a name="trackSession-long-int-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>trackSession</h4>
+<pre>boolean&nbsp;trackSession(long&nbsp;id,
+ int&nbsp;to)</pre>
+<div class="block">Track the session expire, not add to ZkDb.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>id</code> - sessionId</dd>
+<dd><code>to</code> - sessionTimeout</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>whether the session was newly tracked (if false, already tracked)</dd>
+</dl>
+</li>
+</ul>
+<a name="commitSession-long-int-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>commitSession</h4>
+<pre>boolean&nbsp;commitSession(long&nbsp;id,
+ int&nbsp;to)</pre>
+<div class="block">Add the session to the local session map or global one in zkDB.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>id</code> - sessionId</dd>
+<dd><code>to</code> - sessionTimeout</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>whether the session was newly added (if false, already existed)</dd>
+</dl>
+</li>
+</ul>
+<a name="touchSession-long-int-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>touchSession</h4>
+<pre>boolean&nbsp;touchSession(long&nbsp;sessionId,
+ int&nbsp;sessionTimeout)</pre>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sessionId</code> - </dd>
+<dd><code>sessionTimeout</code> - </dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>false if session is no longer active</dd>
+</dl>
+</li>
+</ul>
+<a name="setSessionClosing-long-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>setSessionClosing</h4>
+<pre>void&nbsp;setSessionClosing(long&nbsp;sessionId)</pre>
+<div class="block">Mark that the session is in the process of closing.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sessionId</code> - </dd>
+</dl>
+</li>
+</ul>
+<a name="shutdown--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>shutdown</h4>
+<pre>void&nbsp;shutdown()</pre>
+</li>
+</ul>
+<a name="removeSession-long-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>removeSession</h4>
+<pre>void&nbsp;removeSession(long&nbsp;sessionId)</pre>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sessionId</code> - </dd>
+</dl>
+</li>
+</ul>
+<a name="isTrackingSession-long-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>isTrackingSession</h4>
+<pre>boolean&nbsp;isTrackingSession(long&nbsp;sessionId)</pre>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sessionId</code> - </dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>whether or not the SessionTracker is aware of this session</dd>
+</dl>
+</li>
+</ul>
+<a name="checkSession-long-java.lang.Object-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>checkSession</h4>
+<pre>void&nbsp;checkSession(long&nbsp;sessionId,
+ <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>&nbsp;owner)
+ throws <a href="../../../../org/apache/zookeeper/KeeperException.SessionExpiredException.html" title="class in org.apache.zookeeper">KeeperException.SessionExpiredException</a>,
+ <a href="../../../../org/apache/zookeeper/KeeperException.SessionMovedException.html" title="class in org.apache.zookeeper">KeeperException.SessionMovedException</a>,
+ <a href="../../../../org/apache/zookeeper/KeeperException.UnknownSessionException.html" title="class in org.apache.zookeeper">KeeperException.UnknownSessionException</a></pre>
+<div class="block">Checks whether the SessionTracker is aware of this session, the session
+ is still active, and the owner matches. If the owner wasn't previously
+ set, this sets the owner of the session.
+
+ UnknownSessionException should never been thrown to the client. It is
+ only used internally to deal with possible local session from other
+ machine</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sessionId</code> - </dd>
+<dd><code>owner</code> - </dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="../../../../org/apache/zookeeper/KeeperException.SessionExpiredException.html" title="class in org.apache.zookeeper">KeeperException.SessionExpiredException</a></code></dd>
+<dd><code><a href="../../../../org/apache/zookeeper/KeeperException.SessionMovedException.html" title="class in org.apache.zookeeper">KeeperException.SessionMovedException</a></code></dd>
+<dd><code><a href="../../../../org/apache/zookeeper/KeeperException.UnknownSessionException.html" title="class in org.apache.zookeeper">KeeperException.UnknownSessionException</a></code></dd>
+</dl>
+</li>
+</ul>
+<a name="checkGlobalSession-long-java.lang.Object-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>checkGlobalSession</h4>
+<pre>void&nbsp;checkGlobalSession(long&nbsp;sessionId,
+ <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>&nbsp;owner)
+ throws <a href="../../../../org/apache/zookeeper/KeeperException.SessionExpiredException.html" title="class in org.apache.zookeeper">KeeperException.SessionExpiredException</a>,
+ <a href="../../../../org/apache/zookeeper/KeeperException.SessionMovedException.html" title="class in org.apache.zookeeper">KeeperException.SessionMovedException</a></pre>
+<div class="block">Strictly check that a given session is a global session or not</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>sessionId</code> - </dd>
+<dd><code>owner</code> - </dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>KeeperException.SessionExpiredException</code></dd>
+<dd><code>KeeperException.SessionMovedException</code></dd>
+</dl>
+</li>
+</ul>
+<a name="setOwner-long-java.lang.Object-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>setOwner</h4>
+<pre>void&nbsp;setOwner(long&nbsp;id,
+ <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>&nbsp;owner)
+ throws <a href="../../../../org/apache/zookeeper/KeeperException.SessionExpiredException.html" title="class in org.apache.zookeeper">KeeperException.SessionExpiredException</a></pre>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="../../../../org/apache/zookeeper/KeeperException.SessionExpiredException.html" title="class in org.apache.zookeeper">KeeperException.SessionExpiredException</a></code></dd>
+</dl>
+</li>
+</ul>
+<a name="dumpSessions-java.io.PrintWriter-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>dumpSessions</h4>
+<pre>void&nbsp;dumpSessions(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/PrintWriter.html?is-external=true" title="class or interface in java.io">PrintWriter</a>&nbsp;pwriter)</pre>
+<div class="block">Text dump of session information, suitable for debugging.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>pwriter</code> - the output writer</dd>
+</dl>
+</li>
+</ul>
+<a name="getSessionExpiryMap--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getSessionExpiryMap</h4>
+<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&gt;&nbsp;getSessionExpiryMap()</pre>
+<div class="block">Returns a mapping of time to session IDs that expire at that time.</div>
+</li>
+</ul>
+<a name="getLocalSessionCount--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>getLocalSessionCount</h4>
+<pre>long&nbsp;getLocalSessionCount()</pre>
+<div class="block">If this session tracker supports local sessions, return how many.
+ otherwise returns 0;</div>
+</li>
+</ul>
+<a name="isLocalSessionsEnabled--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>isLocalSessionsEnabled</h4>
+<pre>boolean&nbsp;isLocalSessionsEnabled()</pre>
+</li>
+</ul>
+<a name="globalSessions--">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>globalSessions</h4>
+<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&nbsp;globalSessions()</pre>
+<div class="block">Get a set of global session IDs</div>
+</li>
+</ul>
+<a name="localSessions--">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>localSessions</h4>
+<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;&nbsp;localSessions()</pre>
+<div class="block">Get a set of local session IDs</div>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
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