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+<title>Learner (Apache ZooKeeper - Server 3.8.1 API)</title>
+<meta name="date" content="2023-01-25">
+<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style">
+<script type="text/javascript" src="../../../../../script.js"></script>
+</head>
+<body>
+<script type="text/javascript"><!--
+ try {
+ if (location.href.indexOf('is-external=true') == -1) {
+ parent.document.title="Learner (Apache ZooKeeper - Server 3.8.1 API)";
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+ catch(err) {
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+var activeTableTab = "activeTableTab";
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+<div>JavaScript is disabled on your browser.</div>
+</noscript>
+<!-- ========= START OF TOP NAVBAR ======= -->
+<div class="topNav"><a name="navbar.top">
+<!-- -->
+</a>
+<div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div>
+<a name="navbar.top.firstrow">
+<!-- -->
+</a>
+<ul class="navList" title="Navigation">
+<li><a href="../../../../../overview-summary.html">Overview</a></li>
+<li><a href="package-summary.html">Package</a></li>
+<li class="navBarCell1Rev">Class</li>
+<li><a href="class-use/Learner.html">Use</a></li>
+<li><a href="package-tree.html">Tree</a></li>
+<li><a href="../../../../../deprecated-list.html">Deprecated</a></li>
+<li><a href="../../../../../index-all.html">Index</a></li>
+<li><a href="../../../../../help-doc.html">Help</a></li>
+</ul>
+</div>
+<div class="subNav">
+<ul class="navList">
+<li><a href="../../../../../org/apache/zookeeper/server/quorum/LeaderZooKeeperServer.html" title="class in org.apache.zookeeper.server.quorum"><span class="typeNameLink">Prev&nbsp;Class</span></a></li>
+<li><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html" title="class in org.apache.zookeeper.server.quorum"><span class="typeNameLink">Next&nbsp;Class</span></a></li>
+</ul>
+<ul class="navList">
+<li><a href="../../../../../index.html?org/apache/zookeeper/server/quorum/Learner.html" target="_top">Frames</a></li>
+<li><a href="Learner.html" target="_top">No&nbsp;Frames</a></li>
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+ //-->
+</script>
+</div>
+<div>
+<ul class="subNavList">
+<li>Summary:&nbsp;</li>
+<li>Nested&nbsp;|&nbsp;</li>
+<li><a href="#field.summary">Field</a>&nbsp;|&nbsp;</li>
+<li><a href="#constructor.summary">Constr</a>&nbsp;|&nbsp;</li>
+<li><a href="#method.summary">Method</a></li>
+</ul>
+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
+<li><a href="#field.detail">Field</a>&nbsp;|&nbsp;</li>
+<li><a href="#constructor.detail">Constr</a>&nbsp;|&nbsp;</li>
+<li><a href="#method.detail">Method</a></li>
+</ul>
+</div>
+<a name="skip.navbar.top">
+<!-- -->
+</a></div>
+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.zookeeper.server.quorum</div>
+<h2 title="Class Learner" class="title">Class Learner</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.zookeeper.server.quorum.Learner</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>Direct Known Subclasses:</dt>
+<dd><a href="../../../../../org/apache/zookeeper/server/quorum/Follower.html" title="class in org.apache.zookeeper.server.quorum">Follower</a>, <a href="../../../../../org/apache/zookeeper/server/quorum/Observer.html" title="class in org.apache.zookeeper.server.quorum">Observer</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">Learner</span>
+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">This class is the superclass of two of the three main actors in a ZK
+ ensemble: Followers and Observers. Both Followers and Observers share
+ a good deal of code which is moved into Peer to avoid duplication.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
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+<li class="blockList">
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+<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Field and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/io/BufferedOutputStream.html?is-external=true" title="class or interface in java.io">BufferedOutputStream</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#bufferedOutput">bufferedOutput</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#closeSocketAsync">closeSocketAsync</a></span></code>&nbsp;</td>
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+<td class="colFirst"><code>protected <a href="../../../../../org/apache/zookeeper/server/quorum/MultipleAddresses.html" title="class in org.apache.zookeeper.server.quorum">MultipleAddresses</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#leaderAddr">leaderAddr</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/InputArchive.html?is-external=true" title="class or interface in org.apache.jute">InputArchive</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#leaderIs">leaderIs</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/OutputArchive.html?is-external=true" title="class or interface in org.apache.jute">OutputArchive</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#leaderOs">leaderOs</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#leaderProtocolVersion">leaderProtocolVersion</a></span></code>
+<div class="block">the protocol version of the leader</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#LEARNER_ASYNC_SENDING">LEARNER_ASYNC_SENDING</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#LEARNER_CLOSE_SOCKET_ASYNC">LEARNER_CLOSE_SOCKET_ASYNC</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected static org.slf4j.Logger</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#LOG">LOG</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="../../../../../org/apache/zookeeper/server/util/MessageTracker.html" title="class in org.apache.zookeeper.server.util">MessageTracker</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#messageTracker">messageTracker</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#sock">sock</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicBoolean</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#sockBeingClosed">sockBeingClosed</a></span></code>&nbsp;</td>
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+</table>
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+</ul>
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor.summary">
+<!-- -->
+</a>
+<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">&nbsp;</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/zookeeper/server/quorum/Learner.html#Learner--">Learner</a></span>()</code>&nbsp;</td>
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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="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
+<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>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#connectToLeader-org.apache.zookeeper.server.quorum.MultipleAddresses-java.lang.String-">connectToLeader</a></span>(<a href="../../../../../org/apache/zookeeper/server/quorum/MultipleAddresses.html" title="class in org.apache.zookeeper.server.quorum">MultipleAddresses</a>&nbsp;multiAddr,
+ <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hostname)</code>
+<div class="block">Establish a connection with the LearnerMaster found by findLearnerMaster.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#createSocket--">createSocket</a></span>()</code>
+<div class="block">Creating a simple or and SSL socket.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>protected <a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.QuorumServer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer.QuorumServer</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#findLeader--">findLeader</a></span>()</code>
+<div class="block">Returns the address of the node we think is the leader.</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>protected static boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#getAsyncSending--">getAsyncSending</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#getPendingRevalidationsCount--">getPendingRevalidationsCount</a></span>()</code>&nbsp;</td>
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+<tr id="i5" class="rowColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#getSocket--">getSocket</a></span>()</code>
+<div class="block">Socket getter</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#nanoTime--">nanoTime</a></span>()</code>
+<div class="block">Overridable helper method to return the System.nanoTime().</div>
+</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#ping-org.apache.zookeeper.server.quorum.QuorumPacket-">ping</a></span>(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/quorum/QuorumPacket.html?is-external=true" title="class or interface in org.apache.zookeeper.server.quorum">QuorumPacket</a>&nbsp;qp)</code>&nbsp;</td>
+</tr>
+<tr id="i8" class="altColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#registerWithLeader-int-">registerWithLeader</a></span>(int&nbsp;pktType)</code>
+<div class="block">Once connected to the leader or learner master, perform the handshake
+ protocol to establish a following / observing connection.</div>
+</td>
+</tr>
+<tr id="i9" class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#revalidate-org.apache.zookeeper.server.quorum.QuorumPacket-">revalidate</a></span>(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/quorum/QuorumPacket.html?is-external=true" title="class or interface in org.apache.zookeeper.server.quorum">QuorumPacket</a>&nbsp;qp)</code>&nbsp;</td>
+</tr>
+<tr id="i10" class="altColor">
+<td class="colFirst"><code>protected static void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#setAsyncSending-boolean-">setAsyncSending</a></span>(boolean&nbsp;newMode)</code>&nbsp;</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/quorum/Learner.html#shutdown--">shutdown</a></span>()</code>
+<div class="block">Shutdown the Peer</div>
+</td>
+</tr>
+<tr id="i12" class="altColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#sockConnect-java.net.Socket-java.net.InetSocketAddress-int-">sockConnect</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a>&nbsp;sock,
+ <a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetSocketAddress.html?is-external=true" title="class or interface in java.net">InetSocketAddress</a>&nbsp;addr,
+ int&nbsp;timeout)</code>
+<div class="block">Overridable helper method to simply call sock.connect().</div>
+</td>
+</tr>
+<tr id="i13" class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#startSendingThread--">startSendingThread</a></span>()</code>
+<div class="block">Start thread that will forward any packet in the queue to the leader</div>
+</td>
+</tr>
+<tr id="i14" class="altColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html#syncWithLeader-long-">syncWithLeader</a></span>(long&nbsp;newLeaderZxid)</code>
+<div class="block">Finally, synchronize our history with the Leader (if Follower)
+ or the LearnerMaster (if Observer).</div>
+</td>
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+<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <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>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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+<h4>bufferedOutput</h4>
+<pre>protected&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/io/BufferedOutputStream.html?is-external=true" title="class or interface in java.io">BufferedOutputStream</a> bufferedOutput</pre>
+</li>
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+<a name="sock">
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+<pre>protected&nbsp;int leaderProtocolVersion</pre>
+<div class="block">the protocol version of the leader</div>
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+<pre>protected static final&nbsp;org.slf4j.Logger LOG</pre>
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+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.quorum.Learner.LEARNER_ASYNC_SENDING">Constant Field Values</a></dd>
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+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.quorum.Learner.LEARNER_CLOSE_SOCKET_ASYNC">Constant Field Values</a></dd>
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+<pre>public static final&nbsp;boolean closeSocketAsync</pre>
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+<li class="blockList"><a name="constructor.detail">
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+<h3>Constructor Detail</h3>
+<a name="Learner--">
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+<h4>Learner</h4>
+<pre>public&nbsp;Learner()</pre>
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+<div class="block">Socket getter</div>
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+<pre>protected&nbsp;void&nbsp;startSendingThread()</pre>
+<div class="block">Start thread that will forward any packet in the queue to the leader</div>
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+<a name="findLeader--">
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+<div class="block">Returns the address of the node we think is the leader.</div>
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+<pre>protected&nbsp;long&nbsp;nanoTime()</pre>
+<div class="block">Overridable helper method to return the System.nanoTime().
+ This method behaves identical to System.nanoTime().</div>
+</li>
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+ <a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetSocketAddress.html?is-external=true" title="class or interface in java.net">InetSocketAddress</a>&nbsp;addr,
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+<div class="block">Overridable helper method to simply call sock.connect(). This can be
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+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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+ <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hostname)
+ throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
+<div class="block">Establish a connection with the LearnerMaster found by findLearnerMaster.
+ Followers only connect to Leaders, Observers can connect to any active LearnerMaster.
+ Retries until either initLimit time has elapsed or 5 tries have happened.</div>
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+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>multiAddr</code> - - the address of the Peer to connect to.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - - if the socket connection fails on the 5th attempt
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+<div class="block">Creating a simple or and SSL socket.
+ This can be overridden in tests to fake already connected sockets for connectToLeader.</div>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/zookeeper/common/X509Exception.html" title="class in org.apache.zookeeper.common">X509Exception</a></code></dd>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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+<div class="block">Once connected to the leader or learner master, perform the handshake
+ protocol to establish a following / observing connection.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>pktType</code> - </dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the zxid the Leader sends for synchronization purposes.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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+<div class="block">Finally, synchronize our history with the Leader (if Follower)
+ or the LearnerMaster (if Observer).</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>newLeaderZxid</code> - </dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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+ throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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+<pre>public&nbsp;void&nbsp;shutdown()</pre>
+<div class="block">Shutdown the Peer</div>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
+<!-- ======= START OF BOTTOM NAVBAR ====== -->
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