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svn commit: r1544749 [23/23] - in /incubator/helix/site-content: ./
apidocs/reference/org/apache/helix/manager/zk/ helix-admin-webapp/
helix-agent/ helix-core/ helix-examples/ images/ involved/ recipes/
recipes/distributed-lock-manager/ recipes/rabbitm...
Added: incubator/helix/site-content/xref/org/apache/helix/manager/zk/ControllerManager.html
URL: http://svn.apache.org/viewvc/incubator/helix/site-content/xref/org/apache/helix/manager/zk/ControllerManager.html?rev=1544749&view=auto
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--- incubator/helix/site-content/xref/org/apache/helix/manager/zk/ControllerManager.html (added)
+++ incubator/helix/site-content/xref/org/apache/helix/manager/zk/ControllerManager.html Sat Nov 23 07:11:13 2013
@@ -0,0 +1,187 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+<title>ControllerManager xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../../apidocs/org/apache/helix/manager/zk/ControllerManager.html">View Javadoc</a></div><pre>
+
+<a class="jxr_linenumber" name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.helix.manager.zk;
+<a class="jxr_linenumber" name="2" href="#2">2</a>
+<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_comment">/*</em>
+<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
+<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
+<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
+<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
+<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
+<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
+<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
+<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
+<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em>
+<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em>
+<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
+<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em>
+<a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em>
+<a class="jxr_linenumber" name="19" href="#19">19</a> <em class="jxr_comment"> * under the License.</em>
+<a class="jxr_linenumber" name="20" href="#20">20</a> <em class="jxr_comment"> */</em>
+<a class="jxr_linenumber" name="21" href="#21">21</a>
+<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.util.Arrays;
+<a class="jxr_linenumber" name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.util.List;
+<a class="jxr_linenumber" name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.util.Timer;
+<a class="jxr_linenumber" name="25" href="#25">25</a>
+<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.apache.helix.BaseDataAccessor;
+<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.helix.HelixConstants.ChangeType;
+<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.helix.HelixTimerTask;
+<a class="jxr_linenumber" name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> org.apache.helix.InstanceType;
+<a class="jxr_linenumber" name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.helix.PropertyPathConfig;
+<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> org.apache.helix.PropertyType;
+<a class="jxr_linenumber" name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> org.apache.helix.ZNRecord;
+<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">import</strong> org.apache.helix.controller.GenericHelixController;
+<a class="jxr_linenumber" name="34" href="#34">34</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.HealthStatsAggregationTask;
+<a class="jxr_linenumber" name="35" href="#35">35</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.HealthStatsAggregator;
+<a class="jxr_linenumber" name="36" href="#36">36</a> <strong class="jxr_keyword">import</strong> org.apache.helix.model.LiveInstance;
+<a class="jxr_linenumber" name="37" href="#37">37</a> <strong class="jxr_keyword">import</strong> org.apache.helix.monitoring.ZKPathDataDumpTask;
+<a class="jxr_linenumber" name="38" href="#38">38</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
+<a class="jxr_linenumber" name="39" href="#39">39</a> <strong class="jxr_keyword">import</strong> org.apache.zookeeper.Watcher.Event.EventType;
+<a class="jxr_linenumber" name="40" href="#40">40</a>
+<a class="jxr_linenumber" name="41" href="#41">41</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/helix/manager/zk/ControllerManager.html">ControllerManager</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/apache/helix/manager/zk/AbstractManager.html">AbstractManager</a> {
+<a class="jxr_linenumber" name="42" href="#42">42</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger LOG = Logger.getLogger(ControllerManager.<strong class="jxr_keyword">class</strong>);
+<a class="jxr_linenumber" name="43" href="#43">43</a>
+<a class="jxr_linenumber" name="44" href="#44">44</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a> _controller = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a>();
+<a class="jxr_linenumber" name="45" href="#45">45</a>
+<a class="jxr_linenumber" name="46" href="#46">46</a> <em class="jxr_comment">// TODO merge into GenericHelixController</em>
+<a class="jxr_linenumber" name="47" href="#47">47</a> <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/helix/manager/zk/CallbackHandler.html">CallbackHandler</a> _leaderElectionHandler = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="48" href="#48">48</a>
+<a class="jxr_linenumber" name="49" href="#49">49</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="50" href="#50">50</a> <em class="jxr_javadoccomment"> * status dump timer-task</em>
+<a class="jxr_linenumber" name="51" href="#51">51</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="52" href="#52">52</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/helix/monitoring/StatusDumpTask.html">StatusDumpTask</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/apache/helix/HelixTimerTask.html">HelixTimerTask</a> {
+<a class="jxr_linenumber" name="53" href="#53">53</a> Timer _timer = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="54" href="#54">54</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkClient.html">ZkClient</a> zkclient;
+<a class="jxr_linenumber" name="55" href="#55">55</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/manager/zk/AbstractManager.html">AbstractManager</a> helixController;
+<a class="jxr_linenumber" name="56" href="#56">56</a>
+<a class="jxr_linenumber" name="57" href="#57">57</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/monitoring/StatusDumpTask.html">StatusDumpTask</a>(<a href="../../../../../org/apache/helix/manager/zk/ZkClient.html">ZkClient</a> zkclient, <a href="../../../../../org/apache/helix/manager/zk/AbstractManager.html">AbstractManager</a> helixController) {
+<a class="jxr_linenumber" name="58" href="#58">58</a> <strong class="jxr_keyword">this</strong>.zkclient = zkclient;
+<a class="jxr_linenumber" name="59" href="#59">59</a> <strong class="jxr_keyword">this</strong>.helixController = helixController;
+<a class="jxr_linenumber" name="60" href="#60">60</a> }
+<a class="jxr_linenumber" name="61" href="#61">61</a>
+<a class="jxr_linenumber" name="62" href="#62">62</a> @Override
+<a class="jxr_linenumber" name="63" href="#63">63</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> start() {
+<a class="jxr_linenumber" name="64" href="#64">64</a> <strong class="jxr_keyword">long</strong> initialDelay = 30 * 60 * 1000;
+<a class="jxr_linenumber" name="65" href="#65">65</a> <strong class="jxr_keyword">long</strong> period = 120 * 60 * 1000;
+<a class="jxr_linenumber" name="66" href="#66">66</a> <strong class="jxr_keyword">int</strong> timeThresholdNoChange = 180 * 60 * 1000;
+<a class="jxr_linenumber" name="67" href="#67">67</a>
+<a class="jxr_linenumber" name="68" href="#68">68</a> <strong class="jxr_keyword">if</strong> (_timer == <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="69" href="#69">69</a> LOG.info(<span class="jxr_string">"Start StatusDumpTask"</span>);
+<a class="jxr_linenumber" name="70" href="#70">70</a> _timer = <strong class="jxr_keyword">new</strong> Timer(<span class="jxr_string">"StatusDumpTimerTask"</span>, <strong class="jxr_keyword">true</strong>);
+<a class="jxr_linenumber" name="71" href="#71">71</a> _timer.scheduleAtFixedRate(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/monitoring/ZKPathDataDumpTask.html">ZKPathDataDumpTask</a>(helixController, zkclient,
+<a class="jxr_linenumber" name="72" href="#72">72</a> timeThresholdNoChange), initialDelay, period);
+<a class="jxr_linenumber" name="73" href="#73">73</a> }
+<a class="jxr_linenumber" name="74" href="#74">74</a>
+<a class="jxr_linenumber" name="75" href="#75">75</a> }
+<a class="jxr_linenumber" name="76" href="#76">76</a>
+<a class="jxr_linenumber" name="77" href="#77">77</a> @Override
+<a class="jxr_linenumber" name="78" href="#78">78</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> stop() {
+<a class="jxr_linenumber" name="79" href="#79">79</a> <strong class="jxr_keyword">if</strong> (_timer != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="80" href="#80">80</a> LOG.info(<span class="jxr_string">"Stop StatusDumpTask"</span>);
+<a class="jxr_linenumber" name="81" href="#81">81</a> _timer.cancel();
+<a class="jxr_linenumber" name="82" href="#82">82</a> _timer = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="83" href="#83">83</a> }
+<a class="jxr_linenumber" name="84" href="#84">84</a> }
+<a class="jxr_linenumber" name="85" href="#85">85</a> }
+<a class="jxr_linenumber" name="86" href="#86">86</a>
+<a class="jxr_linenumber" name="87" href="#87">87</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ControllerManager.html">ControllerManager</a>(String zkAddress, String clusterName, String instanceName) {
+<a class="jxr_linenumber" name="88" href="#88">88</a> <strong class="jxr_keyword">super</strong>(zkAddress, clusterName, instanceName, InstanceType.CONTROLLER);
+<a class="jxr_linenumber" name="89" href="#89">89</a>
+<a class="jxr_linenumber" name="90" href="#90">90</a> _timerTasks.add(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/HealthStatsAggregationTask.html">HealthStatsAggregationTask</a>(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/HealthStatsAggregator.html">HealthStatsAggregator</a>(<strong class="jxr_keyword">this</strong>)));
+<a class="jxr_linenumber" name="91" href="#91">91</a> _timerTasks.add(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/monitoring/StatusDumpTask.html">StatusDumpTask</a>(_zkclient, <strong class="jxr_keyword">this</strong>));
+<a class="jxr_linenumber" name="92" href="#92">92</a> }
+<a class="jxr_linenumber" name="93" href="#93">93</a>
+<a class="jxr_linenumber" name="94" href="#94">94</a> @Override
+<a class="jxr_linenumber" name="95" href="#95">95</a> <strong class="jxr_keyword">protected</strong> List<HelixTimerTask> getControllerHelixTimerTasks() {
+<a class="jxr_linenumber" name="96" href="#96">96</a> <strong class="jxr_keyword">return</strong> _timerTasks;
+<a class="jxr_linenumber" name="97" href="#97">97</a> }
+<a class="jxr_linenumber" name="98" href="#98">98</a>
+<a class="jxr_linenumber" name="99" href="#99">99</a> @Override
+<a class="jxr_linenumber" name="100" href="#100">100</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> handleNewSession() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="101" href="#101">101</a> waitUntilConnected();
+<a class="jxr_linenumber" name="102" href="#102">102</a>
+<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * reset all handlers, make sure cleanup completed for previous session</em>
+<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * disconnect if fail to cleanup</em>
+<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="107" href="#107">107</a> <strong class="jxr_keyword">if</strong> (_leaderElectionHandler != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="108" href="#108">108</a> _leaderElectionHandler.reset();
+<a class="jxr_linenumber" name="109" href="#109">109</a> }
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_comment">// TODO reset user defined handlers only</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> resetHandlers();
+<a class="jxr_linenumber" name="112" href="#112">112</a>
+<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * from here on, we are dealing with new session</em>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a>
+<a class="jxr_linenumber" name="117" href="#117">117</a> <strong class="jxr_keyword">if</strong> (_leaderElectionHandler != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="118" href="#118">118</a> _leaderElectionHandler.init();
+<a class="jxr_linenumber" name="119" href="#119">119</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="120" href="#120">120</a> _leaderElectionHandler =
+<a class="jxr_linenumber" name="121" href="#121">121</a> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/CallbackHandler.html">CallbackHandler</a>(<strong class="jxr_keyword">this</strong>, _zkclient, _keyBuilder.controller(),
+<a class="jxr_linenumber" name="122" href="#122">122</a> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/DistributedLeaderElection.html">DistributedLeaderElection</a>(<strong class="jxr_keyword">this</strong>, _controller), <strong class="jxr_keyword">new</strong> EventType[] {
+<a class="jxr_linenumber" name="123" href="#123">123</a> EventType.NodeChildrenChanged, EventType.NodeDeleted, EventType.NodeCreated
+<a class="jxr_linenumber" name="124" href="#124">124</a> }, ChangeType.CONTROLLER);
+<a class="jxr_linenumber" name="125" href="#125">125</a> }
+<a class="jxr_linenumber" name="126" href="#126">126</a>
+<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * init handlers</em>
+<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * ok to init message handler and controller handlers twice</em>
+<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment"> * the second init will be skipped (see CallbackHandler)</em>
+<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="132" href="#132">132</a> initHandlers(_handlers);
+<a class="jxr_linenumber" name="133" href="#133">133</a> }
+<a class="jxr_linenumber" name="134" href="#134">134</a>
+<a class="jxr_linenumber" name="135" href="#135">135</a> @Override
+<a class="jxr_linenumber" name="136" href="#136">136</a> <strong class="jxr_keyword">void</strong> doDisconnect() {
+<a class="jxr_linenumber" name="137" href="#137">137</a> <strong class="jxr_keyword">if</strong> (_leaderElectionHandler != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="138" href="#138">138</a> _leaderElectionHandler.reset();
+<a class="jxr_linenumber" name="139" href="#139">139</a> }
+<a class="jxr_linenumber" name="140" href="#140">140</a> }
+<a class="jxr_linenumber" name="141" href="#141">141</a>
+<a class="jxr_linenumber" name="142" href="#142">142</a> @Override
+<a class="jxr_linenumber" name="143" href="#143">143</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isLeader() {
+<a class="jxr_linenumber" name="144" href="#144">144</a> <strong class="jxr_keyword">if</strong> (!isConnected()) {
+<a class="jxr_linenumber" name="145" href="#145">145</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="146" href="#146">146</a> }
+<a class="jxr_linenumber" name="147" href="#147">147</a>
+<a class="jxr_linenumber" name="148" href="#148">148</a> <strong class="jxr_keyword">try</strong> {
+<a class="jxr_linenumber" name="149" href="#149">149</a> <a href="../../../../../org/apache/helix/model/LiveInstance.html">LiveInstance</a> leader = _dataAccessor.getProperty(_keyBuilder.controllerLeader());
+<a class="jxr_linenumber" name="150" href="#150">150</a> <strong class="jxr_keyword">if</strong> (leader != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="151" href="#151">151</a> String leaderName = leader.getInstanceName();
+<a class="jxr_linenumber" name="152" href="#152">152</a> String sessionId = leader.getTypedSessionId().stringify();
+<a class="jxr_linenumber" name="153" href="#153">153</a> <strong class="jxr_keyword">if</strong> (leaderName != <strong class="jxr_keyword">null</strong> && leaderName.equals(_instanceName) && sessionId != <strong class="jxr_keyword">null</strong>
+<a class="jxr_linenumber" name="154" href="#154">154</a> && sessionId.equals(_sessionId)) {
+<a class="jxr_linenumber" name="155" href="#155">155</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="156" href="#156">156</a> }
+<a class="jxr_linenumber" name="157" href="#157">157</a> }
+<a class="jxr_linenumber" name="158" href="#158">158</a> } <strong class="jxr_keyword">catch</strong> (Exception e) {
+<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_comment">// log</em>
+<a class="jxr_linenumber" name="160" href="#160">160</a> }
+<a class="jxr_linenumber" name="161" href="#161">161</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="162" href="#162">162</a> }
+<a class="jxr_linenumber" name="163" href="#163">163</a>
+<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment"> * helix-controller uses a write-through cache for external-view</em>
+<a class="jxr_linenumber" name="166" href="#166">166</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="167" href="#167">167</a> @Override
+<a class="jxr_linenumber" name="168" href="#168">168</a> BaseDataAccessor<ZNRecord> createBaseDataAccessor(ZkBaseDataAccessor<ZNRecord> baseDataAccessor) {
+<a class="jxr_linenumber" name="169" href="#169">169</a> String extViewPath = PropertyPathConfig.getPath(PropertyType.EXTERNALVIEW, _clusterName);
+<a class="jxr_linenumber" name="170" href="#170">170</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> ZkCacheBaseDataAccessor<ZNRecord>(baseDataAccessor, Arrays.asList(extViewPath));
+<a class="jxr_linenumber" name="171" href="#171">171</a>
+<a class="jxr_linenumber" name="172" href="#172">172</a> }
+<a class="jxr_linenumber" name="173" href="#173">173</a>
+<a class="jxr_linenumber" name="174" href="#174">174</a> }
+</pre>
+<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
+</html>
Added: incubator/helix/site-content/xref/org/apache/helix/manager/zk/DistributedControllerManager.html
URL: http://svn.apache.org/viewvc/incubator/helix/site-content/xref/org/apache/helix/manager/zk/DistributedControllerManager.html?rev=1544749&view=auto
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--- incubator/helix/site-content/xref/org/apache/helix/manager/zk/DistributedControllerManager.html (added)
+++ incubator/helix/site-content/xref/org/apache/helix/manager/zk/DistributedControllerManager.html Sat Nov 23 07:11:13 2013
@@ -0,0 +1,203 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+<title>DistributedControllerManager xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../../apidocs/org/apache/helix/manager/zk/DistributedControllerManager.html">View Javadoc</a></div><pre>
+
+<a class="jxr_linenumber" name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.helix.manager.zk;
+<a class="jxr_linenumber" name="2" href="#2">2</a>
+<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_comment">/*</em>
+<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
+<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
+<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
+<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
+<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
+<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
+<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
+<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
+<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em>
+<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em>
+<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
+<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em>
+<a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em>
+<a class="jxr_linenumber" name="19" href="#19">19</a> <em class="jxr_comment"> * under the License.</em>
+<a class="jxr_linenumber" name="20" href="#20">20</a> <em class="jxr_comment"> */</em>
+<a class="jxr_linenumber" name="21" href="#21">21</a>
+<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList;
+<a class="jxr_linenumber" name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.util.List;
+<a class="jxr_linenumber" name="24" href="#24">24</a>
+<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.helix.HelixConstants.ChangeType;
+<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.apache.helix.HelixException;
+<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.helix.HelixTimerTask;
+<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.helix.InstanceType;
+<a class="jxr_linenumber" name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> org.apache.helix.PreConnectCallback;
+<a class="jxr_linenumber" name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.helix.controller.GenericHelixController;
+<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.HealthStatsAggregationTask;
+<a class="jxr_linenumber" name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.HealthStatsAggregator;
+<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.ParticipantHealthReportCollector;
+<a class="jxr_linenumber" name="34" href="#34">34</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.ParticipantHealthReportCollectorImpl;
+<a class="jxr_linenumber" name="35" href="#35">35</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.ParticipantHealthReportTask;
+<a class="jxr_linenumber" name="36" href="#36">36</a> <strong class="jxr_keyword">import</strong> org.apache.helix.model.LiveInstance;
+<a class="jxr_linenumber" name="37" href="#37">37</a> <strong class="jxr_keyword">import</strong> org.apache.helix.participant.HelixStateMachineEngine;
+<a class="jxr_linenumber" name="38" href="#38">38</a> <strong class="jxr_keyword">import</strong> org.apache.helix.participant.StateMachineEngine;
+<a class="jxr_linenumber" name="39" href="#39">39</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
+<a class="jxr_linenumber" name="40" href="#40">40</a> <strong class="jxr_keyword">import</strong> org.apache.zookeeper.Watcher.Event.EventType;
+<a class="jxr_linenumber" name="41" href="#41">41</a>
+<a class="jxr_linenumber" name="42" href="#42">42</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/helix/manager/zk/DistributedControllerManager.html">DistributedControllerManager</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/apache/helix/manager/zk/AbstractManager.html">AbstractManager</a> {
+<a class="jxr_linenumber" name="43" href="#43">43</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger LOG = Logger.getLogger(DistributedControllerManager.<strong class="jxr_keyword">class</strong>);
+<a class="jxr_linenumber" name="44" href="#44">44</a>
+<a class="jxr_linenumber" name="45" href="#45">45</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/participant/StateMachineEngine.html">StateMachineEngine</a> _stateMachineEngine;
+<a class="jxr_linenumber" name="46" href="#46">46</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportCollectorImpl.html">ParticipantHealthReportCollectorImpl</a> _participantHealthInfoCollector;
+<a class="jxr_linenumber" name="47" href="#47">47</a>
+<a class="jxr_linenumber" name="48" href="#48">48</a> <a href="../../../../../org/apache/helix/manager/zk/CallbackHandler.html">CallbackHandler</a> _leaderElectionHandler = <strong class="jxr_keyword">null</strong>;
+<a class="jxr_linenumber" name="49" href="#49">49</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a> _controller = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/controller/GenericHelixController.html">GenericHelixController</a>();
+<a class="jxr_linenumber" name="50" href="#50">50</a>
+<a class="jxr_linenumber" name="51" href="#51">51</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="52" href="#52">52</a> <em class="jxr_javadoccomment"> * hold timer tasks for controller only</em>
+<a class="jxr_linenumber" name="53" href="#53">53</a> <em class="jxr_javadoccomment"> * we need to add/remove controller timer tasks during handle new session</em>
+<a class="jxr_linenumber" name="54" href="#54">54</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="55" href="#55">55</a> <strong class="jxr_keyword">final</strong> List<HelixTimerTask> _controllerTimerTasks = <strong class="jxr_keyword">new</strong> ArrayList<HelixTimerTask>();
+<a class="jxr_linenumber" name="56" href="#56">56</a>
+<a class="jxr_linenumber" name="57" href="#57">57</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/DistributedControllerManager.html">DistributedControllerManager</a>(String zkAddress, String clusterName, String instanceName) {
+<a class="jxr_linenumber" name="58" href="#58">58</a> <strong class="jxr_keyword">super</strong>(zkAddress, clusterName, instanceName, InstanceType.CONTROLLER_PARTICIPANT);
+<a class="jxr_linenumber" name="59" href="#59">59</a>
+<a class="jxr_linenumber" name="60" href="#60">60</a> _stateMachineEngine = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/participant/HelixStateMachineEngine.html">HelixStateMachineEngine</a>(<strong class="jxr_keyword">this</strong>);
+<a class="jxr_linenumber" name="61" href="#61">61</a> _participantHealthInfoCollector = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportCollectorImpl.html">ParticipantHealthReportCollectorImpl</a>(<strong class="jxr_keyword">this</strong>, _instanceName);
+<a class="jxr_linenumber" name="62" href="#62">62</a>
+<a class="jxr_linenumber" name="63" href="#63">63</a> _timerTasks.add(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportTask.html">ParticipantHealthReportTask</a>(_participantHealthInfoCollector));
+<a class="jxr_linenumber" name="64" href="#64">64</a>
+<a class="jxr_linenumber" name="65" href="#65">65</a> _controllerTimerTasks.add(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/HealthStatsAggregationTask.html">HealthStatsAggregationTask</a>(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/HealthStatsAggregator.html">HealthStatsAggregator</a>(<strong class="jxr_keyword">this</strong>)));
+<a class="jxr_linenumber" name="66" href="#66">66</a> _controllerTimerTasks.add(<strong class="jxr_keyword">new</strong> ControllerManager.StatusDumpTask(_zkclient, <strong class="jxr_keyword">this</strong>));
+<a class="jxr_linenumber" name="67" href="#67">67</a>
+<a class="jxr_linenumber" name="68" href="#68">68</a> }
+<a class="jxr_linenumber" name="69" href="#69">69</a>
+<a class="jxr_linenumber" name="70" href="#70">70</a> @Override
+<a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportCollector.html">ParticipantHealthReportCollector</a> getHealthReportCollector() {
+<a class="jxr_linenumber" name="72" href="#72">72</a> checkConnected();
+<a class="jxr_linenumber" name="73" href="#73">73</a> <strong class="jxr_keyword">return</strong> _participantHealthInfoCollector;
+<a class="jxr_linenumber" name="74" href="#74">74</a> }
+<a class="jxr_linenumber" name="75" href="#75">75</a>
+<a class="jxr_linenumber" name="76" href="#76">76</a> @Override
+<a class="jxr_linenumber" name="77" href="#77">77</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/participant/StateMachineEngine.html">StateMachineEngine</a> getStateMachineEngine() {
+<a class="jxr_linenumber" name="78" href="#78">78</a> <strong class="jxr_keyword">return</strong> _stateMachineEngine;
+<a class="jxr_linenumber" name="79" href="#79">79</a> }
+<a class="jxr_linenumber" name="80" href="#80">80</a>
+<a class="jxr_linenumber" name="81" href="#81">81</a> @Override
+<a class="jxr_linenumber" name="82" href="#82">82</a> <strong class="jxr_keyword">protected</strong> List<HelixTimerTask> getControllerHelixTimerTasks() {
+<a class="jxr_linenumber" name="83" href="#83">83</a> <strong class="jxr_keyword">return</strong> _controllerTimerTasks;
+<a class="jxr_linenumber" name="84" href="#84">84</a> }
+<a class="jxr_linenumber" name="85" href="#85">85</a>
+<a class="jxr_linenumber" name="86" href="#86">86</a> @Override
+<a class="jxr_linenumber" name="87" href="#87">87</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> handleNewSession() <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="88" href="#88">88</a> waitUntilConnected();
+<a class="jxr_linenumber" name="89" href="#89">89</a>
+<a class="jxr_linenumber" name="90" href="#90">90</a> <a href="../../../../../org/apache/helix/manager/zk/ParticipantManagerHelper.html">ParticipantManagerHelper</a> participantHelper =
+<a class="jxr_linenumber" name="91" href="#91">91</a> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/ParticipantManagerHelper.html">ParticipantManagerHelper</a>(<strong class="jxr_keyword">this</strong>, _zkclient, _sessionTimeout);
+<a class="jxr_linenumber" name="92" href="#92">92</a>
+<a class="jxr_linenumber" name="93" href="#93">93</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="94" href="#94">94</a> <em class="jxr_javadoccomment"> * stop all timer tasks, reset all handlers, make sure cleanup completed for previous session</em>
+<a class="jxr_linenumber" name="95" href="#95">95</a> <em class="jxr_javadoccomment"> * disconnect if fail to cleanup</em>
+<a class="jxr_linenumber" name="96" href="#96">96</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="97" href="#97">97</a> stopTimerTasks();
+<a class="jxr_linenumber" name="98" href="#98">98</a> <strong class="jxr_keyword">if</strong> (_leaderElectionHandler != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="99" href="#99">99</a> _leaderElectionHandler.reset();
+<a class="jxr_linenumber" name="100" href="#100">100</a> }
+<a class="jxr_linenumber" name="101" href="#101">101</a> resetHandlers();
+<a class="jxr_linenumber" name="102" href="#102">102</a>
+<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * clean up write-through cache</em>
+<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="106" href="#106">106</a> _baseDataAccessor.reset();
+<a class="jxr_linenumber" name="107" href="#107">107</a>
+<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * from here on, we are dealing with new session</em>
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> <strong class="jxr_keyword">if</strong> (!ZKUtil.isClusterSetup(_clusterName, _zkclient)) {
+<a class="jxr_linenumber" name="112" href="#112">112</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/HelixException.html">HelixException</a>(<span class="jxr_string">"Cluster structure is not set up for cluster: "</span> + _clusterName);
+<a class="jxr_linenumber" name="113" href="#113">113</a> }
+<a class="jxr_linenumber" name="114" href="#114">114</a>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * auto-join</em>
+<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="118" href="#118">118</a> participantHelper.joinCluster();
+<a class="jxr_linenumber" name="119" href="#119">119</a>
+<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * Invoke PreConnectCallbacks</em>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="123" href="#123">123</a> <strong class="jxr_keyword">for</strong> (PreConnectCallback callback : _preConnectCallbacks) {
+<a class="jxr_linenumber" name="124" href="#124">124</a> callback.onPreConnect();
+<a class="jxr_linenumber" name="125" href="#125">125</a> }
+<a class="jxr_linenumber" name="126" href="#126">126</a>
+<a class="jxr_linenumber" name="127" href="#127">127</a> participantHelper.createLiveInstance();
+<a class="jxr_linenumber" name="128" href="#128">128</a>
+<a class="jxr_linenumber" name="129" href="#129">129</a> participantHelper.carryOverPreviousCurrentState();
+<a class="jxr_linenumber" name="130" href="#130">130</a>
+<a class="jxr_linenumber" name="131" href="#131">131</a> participantHelper.setupMsgHandler();
+<a class="jxr_linenumber" name="132" href="#132">132</a>
+<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * leader election</em>
+<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="136" href="#136">136</a> <strong class="jxr_keyword">if</strong> (_leaderElectionHandler != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="137" href="#137">137</a> _leaderElectionHandler.init();
+<a class="jxr_linenumber" name="138" href="#138">138</a> } <strong class="jxr_keyword">else</strong> {
+<a class="jxr_linenumber" name="139" href="#139">139</a> _leaderElectionHandler =
+<a class="jxr_linenumber" name="140" href="#140">140</a> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/CallbackHandler.html">CallbackHandler</a>(<strong class="jxr_keyword">this</strong>, _zkclient, _keyBuilder.controller(),
+<a class="jxr_linenumber" name="141" href="#141">141</a> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/DistributedLeaderElection.html">DistributedLeaderElection</a>(<strong class="jxr_keyword">this</strong>, _controller), <strong class="jxr_keyword">new</strong> EventType[] {
+<a class="jxr_linenumber" name="142" href="#142">142</a> EventType.NodeChildrenChanged, EventType.NodeDeleted, EventType.NodeCreated
+<a class="jxr_linenumber" name="143" href="#143">143</a> }, ChangeType.CONTROLLER);
+<a class="jxr_linenumber" name="144" href="#144">144</a> }
+<a class="jxr_linenumber" name="145" href="#145">145</a>
+<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment"> * start health-check timer task</em>
+<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="149" href="#149">149</a> participantHelper.createHealthCheckPath();
+<a class="jxr_linenumber" name="150" href="#150">150</a> startTimerTasks();
+<a class="jxr_linenumber" name="151" href="#151">151</a>
+<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_javadoccomment"> * init handlers</em>
+<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_javadoccomment"> * ok to init message handler, data-accessor, and controller handlers twice</em>
+<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment"> * the second init will be skipped (see CallbackHandler)</em>
+<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="157" href="#157">157</a> initHandlers(_handlers);
+<a class="jxr_linenumber" name="158" href="#158">158</a>
+<a class="jxr_linenumber" name="159" href="#159">159</a> }
+<a class="jxr_linenumber" name="160" href="#160">160</a>
+<a class="jxr_linenumber" name="161" href="#161">161</a> @Override
+<a class="jxr_linenumber" name="162" href="#162">162</a> <strong class="jxr_keyword">void</strong> doDisconnect() {
+<a class="jxr_linenumber" name="163" href="#163">163</a> <strong class="jxr_keyword">if</strong> (_leaderElectionHandler != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="164" href="#164">164</a> _leaderElectionHandler.reset();
+<a class="jxr_linenumber" name="165" href="#165">165</a> }
+<a class="jxr_linenumber" name="166" href="#166">166</a> }
+<a class="jxr_linenumber" name="167" href="#167">167</a>
+<a class="jxr_linenumber" name="168" href="#168">168</a> @Override
+<a class="jxr_linenumber" name="169" href="#169">169</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isLeader() {
+<a class="jxr_linenumber" name="170" href="#170">170</a> <strong class="jxr_keyword">if</strong> (!isConnected()) {
+<a class="jxr_linenumber" name="171" href="#171">171</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="172" href="#172">172</a> }
+<a class="jxr_linenumber" name="173" href="#173">173</a>
+<a class="jxr_linenumber" name="174" href="#174">174</a> <strong class="jxr_keyword">try</strong> {
+<a class="jxr_linenumber" name="175" href="#175">175</a> <a href="../../../../../org/apache/helix/model/LiveInstance.html">LiveInstance</a> leader = _dataAccessor.getProperty(_keyBuilder.controllerLeader());
+<a class="jxr_linenumber" name="176" href="#176">176</a> <strong class="jxr_keyword">if</strong> (leader != <strong class="jxr_keyword">null</strong>) {
+<a class="jxr_linenumber" name="177" href="#177">177</a> String leaderName = leader.getInstanceName();
+<a class="jxr_linenumber" name="178" href="#178">178</a> String sessionId = leader.getTypedSessionId().stringify();
+<a class="jxr_linenumber" name="179" href="#179">179</a> <strong class="jxr_keyword">if</strong> (leaderName != <strong class="jxr_keyword">null</strong> && leaderName.equals(_instanceName) && sessionId != <strong class="jxr_keyword">null</strong>
+<a class="jxr_linenumber" name="180" href="#180">180</a> && sessionId.equals(_sessionId)) {
+<a class="jxr_linenumber" name="181" href="#181">181</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="182" href="#182">182</a> }
+<a class="jxr_linenumber" name="183" href="#183">183</a> }
+<a class="jxr_linenumber" name="184" href="#184">184</a> } <strong class="jxr_keyword">catch</strong> (Exception e) {
+<a class="jxr_linenumber" name="185" href="#185">185</a> <em class="jxr_comment">// log</em>
+<a class="jxr_linenumber" name="186" href="#186">186</a> }
+<a class="jxr_linenumber" name="187" href="#187">187</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="188" href="#188">188</a> }
+<a class="jxr_linenumber" name="189" href="#189">189</a>
+<a class="jxr_linenumber" name="190" href="#190">190</a> }
+</pre>
+<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
+</html>
Added: incubator/helix/site-content/xref/org/apache/helix/manager/zk/ParticipantManager.html
URL: http://svn.apache.org/viewvc/incubator/helix/site-content/xref/org/apache/helix/manager/zk/ParticipantManager.html?rev=1544749&view=auto
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--- incubator/helix/site-content/xref/org/apache/helix/manager/zk/ParticipantManager.html (added)
+++ incubator/helix/site-content/xref/org/apache/helix/manager/zk/ParticipantManager.html Sat Nov 23 07:11:13 2013
@@ -0,0 +1,166 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+<title>ParticipantManager xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../../apidocs/org/apache/helix/manager/zk/ParticipantManager.html">View Javadoc</a></div><pre>
+
+<a class="jxr_linenumber" name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.helix.manager.zk;
+<a class="jxr_linenumber" name="2" href="#2">2</a>
+<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_comment">/*</em>
+<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
+<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
+<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
+<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
+<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
+<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
+<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
+<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
+<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em>
+<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em>
+<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
+<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em>
+<a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em>
+<a class="jxr_linenumber" name="19" href="#19">19</a> <em class="jxr_comment"> * under the License.</em>
+<a class="jxr_linenumber" name="20" href="#20">20</a> <em class="jxr_comment"> */</em>
+<a class="jxr_linenumber" name="21" href="#21">21</a>
+<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.util.Arrays;
+<a class="jxr_linenumber" name="23" href="#23">23</a>
+<a class="jxr_linenumber" name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> org.apache.helix.BaseDataAccessor;
+<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.apache.helix.HelixException;
+<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.apache.helix.InstanceType;
+<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.helix.PreConnectCallback;
+<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.helix.PropertyPathConfig;
+<a class="jxr_linenumber" name="29" href="#29">29</a> <strong class="jxr_keyword">import</strong> org.apache.helix.PropertyType;
+<a class="jxr_linenumber" name="30" href="#30">30</a> <strong class="jxr_keyword">import</strong> org.apache.helix.ZNRecord;
+<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.ParticipantHealthReportCollector;
+<a class="jxr_linenumber" name="32" href="#32">32</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.ParticipantHealthReportCollectorImpl;
+<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">import</strong> org.apache.helix.healthcheck.ParticipantHealthReportTask;
+<a class="jxr_linenumber" name="34" href="#34">34</a> <strong class="jxr_keyword">import</strong> org.apache.helix.participant.HelixStateMachineEngine;
+<a class="jxr_linenumber" name="35" href="#35">35</a> <strong class="jxr_keyword">import</strong> org.apache.helix.participant.StateMachineEngine;
+<a class="jxr_linenumber" name="36" href="#36">36</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
+<a class="jxr_linenumber" name="37" href="#37">37</a>
+<a class="jxr_linenumber" name="38" href="#38">38</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/helix/manager/zk/ParticipantManager.html">ParticipantManager</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/apache/helix/manager/zk/AbstractManager.html">AbstractManager</a> {
+<a class="jxr_linenumber" name="39" href="#39">39</a>
+<a class="jxr_linenumber" name="40" href="#40">40</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger LOG = Logger.getLogger(ParticipantManager.<strong class="jxr_keyword">class</strong>);
+<a class="jxr_linenumber" name="41" href="#41">41</a>
+<a class="jxr_linenumber" name="42" href="#42">42</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * state-transition message handler factory for helix-participant</em>
+<a class="jxr_linenumber" name="44" href="#44">44</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="45" href="#45">45</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/participant/StateMachineEngine.html">StateMachineEngine</a> _stateMachineEngine;
+<a class="jxr_linenumber" name="46" href="#46">46</a>
+<a class="jxr_linenumber" name="47" href="#47">47</a> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportCollectorImpl.html">ParticipantHealthReportCollectorImpl</a> _participantHealthInfoCollector;
+<a class="jxr_linenumber" name="48" href="#48">48</a>
+<a class="jxr_linenumber" name="49" href="#49">49</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ParticipantManager.html">ParticipantManager</a>(String zkAddress, String clusterName, String instanceName) {
+<a class="jxr_linenumber" name="50" href="#50">50</a> <strong class="jxr_keyword">super</strong>(zkAddress, clusterName, instanceName, InstanceType.PARTICIPANT);
+<a class="jxr_linenumber" name="51" href="#51">51</a>
+<a class="jxr_linenumber" name="52" href="#52">52</a> _stateMachineEngine = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/participant/HelixStateMachineEngine.html">HelixStateMachineEngine</a>(<strong class="jxr_keyword">this</strong>);
+<a class="jxr_linenumber" name="53" href="#53">53</a> _participantHealthInfoCollector = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportCollectorImpl.html">ParticipantHealthReportCollectorImpl</a>(<strong class="jxr_keyword">this</strong>, _instanceName);
+<a class="jxr_linenumber" name="54" href="#54">54</a>
+<a class="jxr_linenumber" name="55" href="#55">55</a> _timerTasks.add(<strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportTask.html">ParticipantHealthReportTask</a>(_participantHealthInfoCollector));
+<a class="jxr_linenumber" name="56" href="#56">56</a> }
+<a class="jxr_linenumber" name="57" href="#57">57</a>
+<a class="jxr_linenumber" name="58" href="#58">58</a> @Override
+<a class="jxr_linenumber" name="59" href="#59">59</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/healthcheck/ParticipantHealthReportCollector.html">ParticipantHealthReportCollector</a> getHealthReportCollector() {
+<a class="jxr_linenumber" name="60" href="#60">60</a> checkConnected();
+<a class="jxr_linenumber" name="61" href="#61">61</a> <strong class="jxr_keyword">return</strong> _participantHealthInfoCollector;
+<a class="jxr_linenumber" name="62" href="#62">62</a> }
+<a class="jxr_linenumber" name="63" href="#63">63</a>
+<a class="jxr_linenumber" name="64" href="#64">64</a> @Override
+<a class="jxr_linenumber" name="65" href="#65">65</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/participant/StateMachineEngine.html">StateMachineEngine</a> getStateMachineEngine() {
+<a class="jxr_linenumber" name="66" href="#66">66</a> <strong class="jxr_keyword">return</strong> _stateMachineEngine;
+<a class="jxr_linenumber" name="67" href="#67">67</a> }
+<a class="jxr_linenumber" name="68" href="#68">68</a>
+<a class="jxr_linenumber" name="69" href="#69">69</a> @Override
+<a class="jxr_linenumber" name="70" href="#70">70</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> handleNewSession() {
+<a class="jxr_linenumber" name="71" href="#71">71</a> waitUntilConnected();
+<a class="jxr_linenumber" name="72" href="#72">72</a>
+<a class="jxr_linenumber" name="73" href="#73">73</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="74" href="#74">74</a> <em class="jxr_javadoccomment"> * stop timer tasks, reset all handlers, make sure cleanup completed for previous session</em>
+<a class="jxr_linenumber" name="75" href="#75">75</a> <em class="jxr_javadoccomment"> * disconnect if cleanup fails</em>
+<a class="jxr_linenumber" name="76" href="#76">76</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="77" href="#77">77</a> stopTimerTasks();
+<a class="jxr_linenumber" name="78" href="#78">78</a> resetHandlers();
+<a class="jxr_linenumber" name="79" href="#79">79</a>
+<a class="jxr_linenumber" name="80" href="#80">80</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="81" href="#81">81</a> <em class="jxr_javadoccomment"> * clear write-through cache</em>
+<a class="jxr_linenumber" name="82" href="#82">82</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="83" href="#83">83</a> _baseDataAccessor.reset();
+<a class="jxr_linenumber" name="84" href="#84">84</a>
+<a class="jxr_linenumber" name="85" href="#85">85</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="86" href="#86">86</a> <em class="jxr_javadoccomment"> * from here on, we are dealing with new session</em>
+<a class="jxr_linenumber" name="87" href="#87">87</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="88" href="#88">88</a> <strong class="jxr_keyword">if</strong> (!ZKUtil.isClusterSetup(_clusterName, _zkclient)) {
+<a class="jxr_linenumber" name="89" href="#89">89</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/HelixException.html">HelixException</a>(<span class="jxr_string">"Cluster structure is not set up for cluster: "</span> + _clusterName);
+<a class="jxr_linenumber" name="90" href="#90">90</a> }
+<a class="jxr_linenumber" name="91" href="#91">91</a>
+<a class="jxr_linenumber" name="92" href="#92">92</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="93" href="#93">93</a> <em class="jxr_javadoccomment"> * auto-join</em>
+<a class="jxr_linenumber" name="94" href="#94">94</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="95" href="#95">95</a> <a href="../../../../../org/apache/helix/manager/zk/ParticipantManagerHelper.html">ParticipantManagerHelper</a> participantHelper =
+<a class="jxr_linenumber" name="96" href="#96">96</a> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/helix/manager/zk/ParticipantManagerHelper.html">ParticipantManagerHelper</a>(<strong class="jxr_keyword">this</strong>, _zkclient, _sessionTimeout);
+<a class="jxr_linenumber" name="97" href="#97">97</a> participantHelper.joinCluster();
+<a class="jxr_linenumber" name="98" href="#98">98</a>
+<a class="jxr_linenumber" name="99" href="#99">99</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * Invoke PreConnectCallbacks</em>
+<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="102" href="#102">102</a> <strong class="jxr_keyword">for</strong> (PreConnectCallback callback : _preConnectCallbacks) {
+<a class="jxr_linenumber" name="103" href="#103">103</a> callback.onPreConnect();
+<a class="jxr_linenumber" name="104" href="#104">104</a> }
+<a class="jxr_linenumber" name="105" href="#105">105</a>
+<a class="jxr_linenumber" name="106" href="#106">106</a> participantHelper.createLiveInstance();
+<a class="jxr_linenumber" name="107" href="#107">107</a>
+<a class="jxr_linenumber" name="108" href="#108">108</a> participantHelper.carryOverPreviousCurrentState();
+<a class="jxr_linenumber" name="109" href="#109">109</a>
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * setup message listener</em>
+<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="113" href="#113">113</a> participantHelper.setupMsgHandler();
+<a class="jxr_linenumber" name="114" href="#114">114</a>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * start health check timer task</em>
+<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="118" href="#118">118</a> participantHelper.createHealthCheckPath();
+<a class="jxr_linenumber" name="119" href="#119">119</a> startTimerTasks();
+<a class="jxr_linenumber" name="120" href="#120">120</a>
+<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * init handlers</em>
+<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * ok to init message handler and data-accessor twice</em>
+<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * the second init will be skipped (see CallbackHandler)</em>
+<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="126" href="#126">126</a> initHandlers(_handlers);
+<a class="jxr_linenumber" name="127" href="#127">127</a>
+<a class="jxr_linenumber" name="128" href="#128">128</a> }
+<a class="jxr_linenumber" name="129" href="#129">129</a>
+<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment"> * helix-participant uses a write-through cache for current-state</em>
+<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="133" href="#133">133</a> @Override
+<a class="jxr_linenumber" name="134" href="#134">134</a> BaseDataAccessor<ZNRecord> createBaseDataAccessor(ZkBaseDataAccessor<ZNRecord> baseDataAccessor) {
+<a class="jxr_linenumber" name="135" href="#135">135</a> String curStatePath =
+<a class="jxr_linenumber" name="136" href="#136">136</a> PropertyPathConfig.getPath(PropertyType.CURRENTSTATES, _clusterName, _instanceName);
+<a class="jxr_linenumber" name="137" href="#137">137</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> ZkCacheBaseDataAccessor<ZNRecord>(baseDataAccessor, Arrays.asList(curStatePath));
+<a class="jxr_linenumber" name="138" href="#138">138</a>
+<a class="jxr_linenumber" name="139" href="#139">139</a> }
+<a class="jxr_linenumber" name="140" href="#140">140</a>
+<a class="jxr_linenumber" name="141" href="#141">141</a> @Override
+<a class="jxr_linenumber" name="142" href="#142">142</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isLeader() {
+<a class="jxr_linenumber" name="143" href="#143">143</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="144" href="#144">144</a> }
+<a class="jxr_linenumber" name="145" href="#145">145</a>
+<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment"> * disconnect logic for helix-participant</em>
+<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="149" href="#149">149</a> @Override
+<a class="jxr_linenumber" name="150" href="#150">150</a> <strong class="jxr_keyword">void</strong> doDisconnect() {
+<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_comment">// nothing for participant</em>
+<a class="jxr_linenumber" name="152" href="#152">152</a> }
+<a class="jxr_linenumber" name="153" href="#153">153</a> }
+</pre>
+<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
+</html>
Added: incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkStateChangeListener.html
URL: http://svn.apache.org/viewvc/incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkStateChangeListener.html?rev=1544749&view=auto
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--- incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkStateChangeListener.html (added)
+++ incubator/helix/site-content/xref/org/apache/helix/manager/zk/ZkStateChangeListener.html Sat Nov 23 07:11:13 2013
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+<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+<title>ZkStateChangeListener xref</title>
+<link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" />
+</head>
+<body>
+<div id="overview"><a href="../../../../../../apidocs/org/apache/helix/manager/zk/ZkStateChangeListener.html">View Javadoc</a></div><pre>
+
+<a class="jxr_linenumber" name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.helix.manager.zk;
+<a class="jxr_linenumber" name="2" href="#2">2</a>
+<a class="jxr_linenumber" name="3" href="#3">3</a> <em class="jxr_comment">/*</em>
+<a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
+<a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em>
+<a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_comment"> * distributed with this work for additional information</em>
+<a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em>
+<a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em>
+<a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em>
+<a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em>
+<a class="jxr_linenumber" name="11" href="#11">11</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
+<a class="jxr_linenumber" name="13" href="#13">13</a> <em class="jxr_comment"> *</em>
+<a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em>
+<a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em>
+<a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
+<a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em>
+<a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em>
+<a class="jxr_linenumber" name="19" href="#19">19</a> <em class="jxr_comment"> * under the License.</em>
+<a class="jxr_linenumber" name="20" href="#20">20</a> <em class="jxr_comment"> */</em>
+<a class="jxr_linenumber" name="21" href="#21">21</a>
+<a class="jxr_linenumber" name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.util.LinkedList;
+<a class="jxr_linenumber" name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.util.List;
+<a class="jxr_linenumber" name="24" href="#24">24</a>
+<a class="jxr_linenumber" name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> org.I0Itec.zkclient.IZkStateListener;
+<a class="jxr_linenumber" name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> org.I0Itec.zkclient.ZkConnection;
+<a class="jxr_linenumber" name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
+<a class="jxr_linenumber" name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> org.apache.zookeeper.Watcher.Event.KeeperState;
+<a class="jxr_linenumber" name="29" href="#29">29</a>
+<a class="jxr_linenumber" name="30" href="#30">30</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkStateChangeListener.html">ZkStateChangeListener</a> <strong class="jxr_keyword">implements</strong> IZkStateListener {
+<a class="jxr_linenumber" name="31" href="#31">31</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">boolean</strong> _isConnected;
+<a class="jxr_linenumber" name="32" href="#32">32</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">boolean</strong> _hasSessionExpired;
+<a class="jxr_linenumber" name="33" href="#33">33</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/apache/helix/manager/zk/ZKHelixManager.html">ZKHelixManager</a> _zkHelixManager;
+<a class="jxr_linenumber" name="34" href="#34">34</a>
+<a class="jxr_linenumber" name="35" href="#35">35</a> <em class="jxr_comment">// Keep track of timestamps that zk State has become Disconnected</em>
+<a class="jxr_linenumber" name="36" href="#36">36</a> <em class="jxr_comment">// If in a _timeWindowLengthMs window zk State has become Disconnected</em>
+<a class="jxr_linenumber" name="37" href="#37">37</a> <em class="jxr_comment">// for more than_maxDisconnectThreshold times disconnect the zkHelixManager</em>
+<a class="jxr_linenumber" name="38" href="#38">38</a> List<Long> _disconnectTimeHistory = <strong class="jxr_keyword">new</strong> LinkedList<Long>();
+<a class="jxr_linenumber" name="39" href="#39">39</a> <strong class="jxr_keyword">int</strong> _timeWindowLengthMs;
+<a class="jxr_linenumber" name="40" href="#40">40</a> <strong class="jxr_keyword">int</strong> _maxDisconnectThreshold;
+<a class="jxr_linenumber" name="41" href="#41">41</a>
+<a class="jxr_linenumber" name="42" href="#42">42</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Logger logger = Logger.getLogger(ZkStateChangeListener.<strong class="jxr_keyword">class</strong>);
+<a class="jxr_linenumber" name="43" href="#43">43</a>
+<a class="jxr_linenumber" name="44" href="#44">44</a> <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/helix/manager/zk/ZkStateChangeListener.html">ZkStateChangeListener</a>(<a href="../../../../../org/apache/helix/manager/zk/ZKHelixManager.html">ZKHelixManager</a> zkHelixManager, <strong class="jxr_keyword">int</strong> timeWindowLengthMs,
+<a class="jxr_linenumber" name="45" href="#45">45</a> <strong class="jxr_keyword">int</strong> maxDisconnectThreshold) {
+<a class="jxr_linenumber" name="46" href="#46">46</a> <strong class="jxr_keyword">this</strong>._zkHelixManager = zkHelixManager;
+<a class="jxr_linenumber" name="47" href="#47">47</a> _timeWindowLengthMs = timeWindowLengthMs;
+<a class="jxr_linenumber" name="48" href="#48">48</a> <em class="jxr_comment">// _maxDisconnectThreshold min value is 1.</em>
+<a class="jxr_linenumber" name="49" href="#49">49</a> <em class="jxr_comment">// We don't want to disconnect from zk for the first time zkState become Disconnected</em>
+<a class="jxr_linenumber" name="50" href="#50">50</a> _maxDisconnectThreshold = maxDisconnectThreshold > 0 ? maxDisconnectThreshold : 1;
+<a class="jxr_linenumber" name="51" href="#51">51</a> }
+<a class="jxr_linenumber" name="52" href="#52">52</a>
+<a class="jxr_linenumber" name="53" href="#53">53</a> @Override
+<a class="jxr_linenumber" name="54" href="#54">54</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> handleNewSession() {
+<a class="jxr_linenumber" name="55" href="#55">55</a> <em class="jxr_comment">// TODO:bug in zkclient .</em>
+<a class="jxr_linenumber" name="56" href="#56">56</a> <em class="jxr_comment">// zkclient does not invoke handleStateChanged when a session expires but</em>
+<a class="jxr_linenumber" name="57" href="#57">57</a> <em class="jxr_comment">// directly invokes handleNewSession</em>
+<a class="jxr_linenumber" name="58" href="#58">58</a> _isConnected = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="59" href="#59">59</a> _hasSessionExpired = false;
+<a class="jxr_linenumber" name="60" href="#60">60</a> _zkHelixManager.handleNewSession();
+<a class="jxr_linenumber" name="61" href="#61">61</a> }
+<a class="jxr_linenumber" name="62" href="#62">62</a>
+<a class="jxr_linenumber" name="63" href="#63">63</a> @Override
+<a class="jxr_linenumber" name="64" href="#64">64</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> handleStateChanged(KeeperState keeperState) <strong class="jxr_keyword">throws</strong> Exception {
+<a class="jxr_linenumber" name="65" href="#65">65</a> <strong class="jxr_keyword">switch</strong> (keeperState) {
+<a class="jxr_linenumber" name="66" href="#66">66</a> <strong class="jxr_keyword">case</strong> SyncConnected:
+<a class="jxr_linenumber" name="67" href="#67">67</a> ZkConnection zkConnection = ((ZkConnection) _zkHelixManager._zkClient.getConnection());
+<a class="jxr_linenumber" name="68" href="#68">68</a> logger.info(<span class="jxr_string">"KeeperState: "</span> + keeperState + <span class="jxr_string">", zookeeper:"</span> + zkConnection.getZookeeper());
+<a class="jxr_linenumber" name="69" href="#69">69</a> _isConnected = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="70" href="#70">70</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">case</strong> Disconnected:
+<a class="jxr_linenumber" name="72" href="#72">72</a> logger.info(<span class="jxr_string">"KeeperState:"</span> + keeperState + <span class="jxr_string">", disconnectedSessionId: "</span>
+<a class="jxr_linenumber" name="73" href="#73">73</a> + _zkHelixManager._sessionId + <span class="jxr_string">", instance: "</span> + _zkHelixManager.getInstanceName()
+<a class="jxr_linenumber" name="74" href="#74">74</a> + <span class="jxr_string">", type: "</span> + _zkHelixManager.getInstanceType());
+<a class="jxr_linenumber" name="75" href="#75">75</a>
+<a class="jxr_linenumber" name="76" href="#76">76</a> _isConnected = false;
+<a class="jxr_linenumber" name="77" href="#77">77</a> <em class="jxr_comment">// Track the time stamp that the disconnected happens, then check history and see if</em>
+<a class="jxr_linenumber" name="78" href="#78">78</a> <em class="jxr_comment">// we should disconnect the _zkHelixManager</em>
+<a class="jxr_linenumber" name="79" href="#79">79</a> _disconnectTimeHistory.add(System.currentTimeMillis());
+<a class="jxr_linenumber" name="80" href="#80">80</a> <strong class="jxr_keyword">if</strong> (isFlapping()) {
+<a class="jxr_linenumber" name="81" href="#81">81</a> logger.error(<span class="jxr_string">"isFlapping() returns true, so disconnect the helix manager. "</span>
+<a class="jxr_linenumber" name="82" href="#82">82</a> + _zkHelixManager.getInstanceName() + <span class="jxr_string">" "</span> + _maxDisconnectThreshold
+<a class="jxr_linenumber" name="83" href="#83">83</a> + <span class="jxr_string">" disconnects in "</span> + _timeWindowLengthMs + <span class="jxr_string">" Ms."</span>);
+<a class="jxr_linenumber" name="84" href="#84">84</a> _zkHelixManager.disconnectInternal();
+<a class="jxr_linenumber" name="85" href="#85">85</a> }
+<a class="jxr_linenumber" name="86" href="#86">86</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="87" href="#87">87</a> <strong class="jxr_keyword">case</strong> Expired:
+<a class="jxr_linenumber" name="88" href="#88">88</a> logger.info(<span class="jxr_string">"KeeperState:"</span> + keeperState + <span class="jxr_string">", expiredSessionId: "</span>
+<a class="jxr_linenumber" name="89" href="#89">89</a> + _zkHelixManager._sessionId + <span class="jxr_string">", instance: "</span> + _zkHelixManager.getInstanceName()
+<a class="jxr_linenumber" name="90" href="#90">90</a> + <span class="jxr_string">", type: "</span> + _zkHelixManager.getInstanceType());
+<a class="jxr_linenumber" name="91" href="#91">91</a>
+<a class="jxr_linenumber" name="92" href="#92">92</a> _isConnected = false;
+<a class="jxr_linenumber" name="93" href="#93">93</a> _hasSessionExpired = <strong class="jxr_keyword">true</strong>;
+<a class="jxr_linenumber" name="94" href="#94">94</a> <strong class="jxr_keyword">break</strong>;
+<a class="jxr_linenumber" name="95" href="#95">95</a> }
+<a class="jxr_linenumber" name="96" href="#96">96</a> }
+<a class="jxr_linenumber" name="97" href="#97">97</a>
+<a class="jxr_linenumber" name="98" href="#98">98</a> <strong class="jxr_keyword">boolean</strong> isConnected() {
+<a class="jxr_linenumber" name="99" href="#99">99</a> <strong class="jxr_keyword">return</strong> _isConnected;
+<a class="jxr_linenumber" name="100" href="#100">100</a> }
+<a class="jxr_linenumber" name="101" href="#101">101</a>
+<a class="jxr_linenumber" name="102" href="#102">102</a> <strong class="jxr_keyword">void</strong> disconnect() {
+<a class="jxr_linenumber" name="103" href="#103">103</a> _isConnected = false;
+<a class="jxr_linenumber" name="104" href="#104">104</a> }
+<a class="jxr_linenumber" name="105" href="#105">105</a>
+<a class="jxr_linenumber" name="106" href="#106">106</a> <strong class="jxr_keyword">boolean</strong> hasSessionExpired() {
+<a class="jxr_linenumber" name="107" href="#107">107</a> <strong class="jxr_keyword">return</strong> _hasSessionExpired;
+<a class="jxr_linenumber" name="108" href="#108">108</a> }
+<a class="jxr_linenumber" name="109" href="#109">109</a>
+<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment">/**</em>
+<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * If zk state has changed into Disconnected for _maxDisconnectThreshold times during previous</em>
+<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * _timeWindowLengthMs Ms</em>
+<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * time window, we think that there are something wrong going on and disconnect the zkHelixManager</em>
+<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * from zk.</em>
+<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> */</em>
+<a class="jxr_linenumber" name="116" href="#116">116</a> <strong class="jxr_keyword">boolean</strong> isFlapping() {
+<a class="jxr_linenumber" name="117" href="#117">117</a> <strong class="jxr_keyword">if</strong> (_disconnectTimeHistory.size() == 0) {
+<a class="jxr_linenumber" name="118" href="#118">118</a> <strong class="jxr_keyword">return</strong> false;
+<a class="jxr_linenumber" name="119" href="#119">119</a> }
+<a class="jxr_linenumber" name="120" href="#120">120</a> <strong class="jxr_keyword">long</strong> mostRecentTimestamp = _disconnectTimeHistory.get(_disconnectTimeHistory.size() - 1);
+<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_comment">// Remove disconnect history timestamp that are older than _timeWindowLengthMs ago</em>
+<a class="jxr_linenumber" name="122" href="#122">122</a> <strong class="jxr_keyword">while</strong> ((_disconnectTimeHistory.get(0) + _timeWindowLengthMs) < mostRecentTimestamp) {
+<a class="jxr_linenumber" name="123" href="#123">123</a> _disconnectTimeHistory.remove(0);
+<a class="jxr_linenumber" name="124" href="#124">124</a> }
+<a class="jxr_linenumber" name="125" href="#125">125</a> <strong class="jxr_keyword">return</strong> _disconnectTimeHistory.size() > _maxDisconnectThreshold;
+<a class="jxr_linenumber" name="126" href="#126">126</a> }
+<a class="jxr_linenumber" name="127" href="#127">127</a> }
+</pre>
+<hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body>
+</html>