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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import org.apache.hadoop.hbase.Stoppable;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.slf4j.Logger;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">024</span><span id="line-24"></span> |
| <span class="source-line-no">025</span><span id="line-25">/**</span> |
| <span class="source-line-no">026</span><span id="line-26"> * Sleeper for current thread. Sleeps for passed period. Also checks passed boolean and if</span> |
| <span class="source-line-no">027</span><span id="line-27"> * interrupted, will return if the flag is set (rather than go back to sleep until its sleep time is</span> |
| <span class="source-line-no">028</span><span id="line-28"> * up).</span> |
| <span class="source-line-no">029</span><span id="line-29"> */</span> |
| <span class="source-line-no">030</span><span id="line-30">@InterfaceAudience.Private</span> |
| <span class="source-line-no">031</span><span id="line-31">public class Sleeper {</span> |
| <span class="source-line-no">032</span><span id="line-32"> private static final Logger LOG = LoggerFactory.getLogger(Sleeper.class);</span> |
| <span class="source-line-no">033</span><span id="line-33"> private final int period;</span> |
| <span class="source-line-no">034</span><span id="line-34"> private final Stoppable stopper;</span> |
| <span class="source-line-no">035</span><span id="line-35"> private static final long MINIMAL_DELTA_FOR_LOGGING = 10000;</span> |
| <span class="source-line-no">036</span><span id="line-36"></span> |
| <span class="source-line-no">037</span><span id="line-37"> private final Object sleepLock = new Object();</span> |
| <span class="source-line-no">038</span><span id="line-38"> private boolean triggerWake = false;</span> |
| <span class="source-line-no">039</span><span id="line-39"></span> |
| <span class="source-line-no">040</span><span id="line-40"> /**</span> |
| <span class="source-line-no">041</span><span id="line-41"> * @param sleep sleep time in milliseconds</span> |
| <span class="source-line-no">042</span><span id="line-42"> * @param stopper When {@link Stoppable#isStopped()} is true, this thread will cleanup and exit</span> |
| <span class="source-line-no">043</span><span id="line-43"> * cleanly.</span> |
| <span class="source-line-no">044</span><span id="line-44"> */</span> |
| <span class="source-line-no">045</span><span id="line-45"> public Sleeper(final int sleep, final Stoppable stopper) {</span> |
| <span class="source-line-no">046</span><span id="line-46"> this.period = sleep;</span> |
| <span class="source-line-no">047</span><span id="line-47"> this.stopper = stopper;</span> |
| <span class="source-line-no">048</span><span id="line-48"> }</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> /**</span> |
| <span class="source-line-no">051</span><span id="line-51"> * If currently asleep, stops sleeping; if not asleep, will skip the next sleep cycle.</span> |
| <span class="source-line-no">052</span><span id="line-52"> */</span> |
| <span class="source-line-no">053</span><span id="line-53"> public void skipSleepCycle() {</span> |
| <span class="source-line-no">054</span><span id="line-54"> synchronized (sleepLock) {</span> |
| <span class="source-line-no">055</span><span id="line-55"> triggerWake = true;</span> |
| <span class="source-line-no">056</span><span id="line-56"> sleepLock.notifyAll();</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</span> |
| <span class="source-line-no">058</span><span id="line-58"> }</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> /**</span> |
| <span class="source-line-no">061</span><span id="line-61"> * Sleep for period.</span> |
| <span class="source-line-no">062</span><span id="line-62"> */</span> |
| <span class="source-line-no">063</span><span id="line-63"> public void sleep() {</span> |
| <span class="source-line-no">064</span><span id="line-64"> sleep(this.period);</span> |
| <span class="source-line-no">065</span><span id="line-65"> }</span> |
| <span class="source-line-no">066</span><span id="line-66"></span> |
| <span class="source-line-no">067</span><span id="line-67"> public void sleep(long sleepTime) {</span> |
| <span class="source-line-no">068</span><span id="line-68"> if (this.stopper.isStopped()) {</span> |
| <span class="source-line-no">069</span><span id="line-69"> return;</span> |
| <span class="source-line-no">070</span><span id="line-70"> }</span> |
| <span class="source-line-no">071</span><span id="line-71"> long now = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">072</span><span id="line-72"> long currentSleepTime = sleepTime;</span> |
| <span class="source-line-no">073</span><span id="line-73"> while (currentSleepTime > 0) {</span> |
| <span class="source-line-no">074</span><span id="line-74"> long woke = -1;</span> |
| <span class="source-line-no">075</span><span id="line-75"> try {</span> |
| <span class="source-line-no">076</span><span id="line-76"> synchronized (sleepLock) {</span> |
| <span class="source-line-no">077</span><span id="line-77"> if (triggerWake) {</span> |
| <span class="source-line-no">078</span><span id="line-78"> break;</span> |
| <span class="source-line-no">079</span><span id="line-79"> }</span> |
| <span class="source-line-no">080</span><span id="line-80"></span> |
| <span class="source-line-no">081</span><span id="line-81"> sleepLock.wait(currentSleepTime);</span> |
| <span class="source-line-no">082</span><span id="line-82"> }</span> |
| <span class="source-line-no">083</span><span id="line-83"> woke = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">084</span><span id="line-84"> long slept = woke - now;</span> |
| <span class="source-line-no">085</span><span id="line-85"> if (slept - this.period > MINIMAL_DELTA_FOR_LOGGING) {</span> |
| <span class="source-line-no">086</span><span id="line-86"> LOG.warn(</span> |
| <span class="source-line-no">087</span><span id="line-87"> "We slept {}ms instead of {}ms, this is likely due to a long "</span> |
| <span class="source-line-no">088</span><span id="line-88"> + "garbage collecting pause and it's usually bad, see "</span> |
| <span class="source-line-no">089</span><span id="line-89"> + "http://hbase.apache.org/book.html#trouble.rs.runtime.zkexpired",</span> |
| <span class="source-line-no">090</span><span id="line-90"> slept, this.period);</span> |
| <span class="source-line-no">091</span><span id="line-91"> }</span> |
| <span class="source-line-no">092</span><span id="line-92"> } catch (InterruptedException iex) {</span> |
| <span class="source-line-no">093</span><span id="line-93"> // We we interrupted because we're meant to stop? If not, just</span> |
| <span class="source-line-no">094</span><span id="line-94"> // continue ignoring the interruption</span> |
| <span class="source-line-no">095</span><span id="line-95"> if (this.stopper.isStopped()) {</span> |
| <span class="source-line-no">096</span><span id="line-96"> return;</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98"> }</span> |
| <span class="source-line-no">099</span><span id="line-99"> // Recalculate waitTime.</span> |
| <span class="source-line-no">100</span><span id="line-100"> woke = (woke == -1) ? EnvironmentEdgeManager.currentTime() : woke;</span> |
| <span class="source-line-no">101</span><span id="line-101"> currentSleepTime = this.period - (woke - now);</span> |
| <span class="source-line-no">102</span><span id="line-102"> }</span> |
| <span class="source-line-no">103</span><span id="line-103"> synchronized (sleepLock) {</span> |
| <span class="source-line-no">104</span><span id="line-104"> triggerWake = false;</span> |
| <span class="source-line-no">105</span><span id="line-105"> }</span> |
| <span class="source-line-no">106</span><span id="line-106"> }</span> |
| <span class="source-line-no">107</span><span id="line-107"></span> |
| <span class="source-line-no">108</span><span id="line-108"> /** Returns the sleep period in milliseconds */</span> |
| <span class="source-line-no">109</span><span id="line-109"> public final int getPeriod() {</span> |
| <span class="source-line-no">110</span><span id="line-110"> return period;</span> |
| <span class="source-line-no">111</span><span id="line-111"> }</span> |
| <span class="source-line-no">112</span><span id="line-112">}</span> |
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| </pre> |
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