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<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> *<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a>
<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a>
<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a>
<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a>
<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a>
<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a>
<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a>
<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a>
<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.HashSet;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.List;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.Set;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.concurrent.ExecutionException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.concurrent.Future;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.conf.Configuration;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.slf4j.Logger;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.slf4j.LoggerFactory;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>public abstract class MultithreadedTestUtil {<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span> private static final Logger LOG =<a name="line.34"></a>
<span class="sourceLineNo">035</span> LoggerFactory.getLogger(MultithreadedTestUtil.class);<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span> public static class TestContext {<a name="line.37"></a>
<span class="sourceLineNo">038</span> private final Configuration conf;<a name="line.38"></a>
<span class="sourceLineNo">039</span> private Throwable err = null;<a name="line.39"></a>
<span class="sourceLineNo">040</span> private boolean stopped = false;<a name="line.40"></a>
<span class="sourceLineNo">041</span> private int threadDoneCount = 0;<a name="line.41"></a>
<span class="sourceLineNo">042</span> private Set&lt;TestThread&gt; testThreads = new HashSet&lt;&gt;();<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span> public TestContext(Configuration configuration) {<a name="line.44"></a>
<span class="sourceLineNo">045</span> this.conf = configuration;<a name="line.45"></a>
<span class="sourceLineNo">046</span> }<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> protected Configuration getConf() {<a name="line.48"></a>
<span class="sourceLineNo">049</span> return conf;<a name="line.49"></a>
<span class="sourceLineNo">050</span> }<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> public synchronized boolean shouldRun() {<a name="line.52"></a>
<span class="sourceLineNo">053</span> return !stopped &amp;&amp; err == null;<a name="line.53"></a>
<span class="sourceLineNo">054</span> }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span> public void addThread(TestThread t) {<a name="line.56"></a>
<span class="sourceLineNo">057</span> testThreads.add(t);<a name="line.57"></a>
<span class="sourceLineNo">058</span> }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span> public void startThreads() {<a name="line.60"></a>
<span class="sourceLineNo">061</span> for (TestThread t : testThreads) {<a name="line.61"></a>
<span class="sourceLineNo">062</span> t.start();<a name="line.62"></a>
<span class="sourceLineNo">063</span> }<a name="line.63"></a>
<span class="sourceLineNo">064</span> }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span> public void waitFor(long millis) throws Exception {<a name="line.66"></a>
<span class="sourceLineNo">067</span> long endTime = System.currentTimeMillis() + millis;<a name="line.67"></a>
<span class="sourceLineNo">068</span> while (!stopped) {<a name="line.68"></a>
<span class="sourceLineNo">069</span> long left = endTime - System.currentTimeMillis();<a name="line.69"></a>
<span class="sourceLineNo">070</span> if (left &lt;= 0) break;<a name="line.70"></a>
<span class="sourceLineNo">071</span> synchronized (this) {<a name="line.71"></a>
<span class="sourceLineNo">072</span> checkException();<a name="line.72"></a>
<span class="sourceLineNo">073</span> wait(left);<a name="line.73"></a>
<span class="sourceLineNo">074</span> }<a name="line.74"></a>
<span class="sourceLineNo">075</span> }<a name="line.75"></a>
<span class="sourceLineNo">076</span> }<a name="line.76"></a>
<span class="sourceLineNo">077</span> private synchronized void checkException() throws Exception {<a name="line.77"></a>
<span class="sourceLineNo">078</span> if (err != null) {<a name="line.78"></a>
<span class="sourceLineNo">079</span> throw new RuntimeException("Deferred", err);<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span> public synchronized void threadFailed(Throwable t) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> if (err == null) err = t;<a name="line.84"></a>
<span class="sourceLineNo">085</span> LOG.error("Failed!", err);<a name="line.85"></a>
<span class="sourceLineNo">086</span> notify();<a name="line.86"></a>
<span class="sourceLineNo">087</span> }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span> public synchronized void threadDone() {<a name="line.89"></a>
<span class="sourceLineNo">090</span> threadDoneCount++;<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> public void setStopFlag(boolean s) throws Exception {<a name="line.93"></a>
<span class="sourceLineNo">094</span> synchronized (this) {<a name="line.94"></a>
<span class="sourceLineNo">095</span> stopped = s;<a name="line.95"></a>
<span class="sourceLineNo">096</span> }<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span> public void stop() throws Exception {<a name="line.99"></a>
<span class="sourceLineNo">100</span> synchronized (this) {<a name="line.100"></a>
<span class="sourceLineNo">101</span> stopped = true;<a name="line.101"></a>
<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span> for (TestThread t : testThreads) {<a name="line.103"></a>
<span class="sourceLineNo">104</span> t.join();<a name="line.104"></a>
<span class="sourceLineNo">105</span> }<a name="line.105"></a>
<span class="sourceLineNo">106</span> checkException();<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<a name="line.107"></a>
<span class="sourceLineNo">108</span> }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span> /**<a name="line.110"></a>
<span class="sourceLineNo">111</span> * A thread that can be added to a test context, and properly<a name="line.111"></a>
<span class="sourceLineNo">112</span> * passes exceptions through.<a name="line.112"></a>
<span class="sourceLineNo">113</span> */<a name="line.113"></a>
<span class="sourceLineNo">114</span> public static abstract class TestThread extends Thread {<a name="line.114"></a>
<span class="sourceLineNo">115</span> protected final TestContext ctx;<a name="line.115"></a>
<span class="sourceLineNo">116</span> protected boolean stopped;<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span> public TestThread(TestContext ctx) {<a name="line.118"></a>
<span class="sourceLineNo">119</span> this.ctx = ctx;<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span> @Override<a name="line.122"></a>
<span class="sourceLineNo">123</span> public void run() {<a name="line.123"></a>
<span class="sourceLineNo">124</span> try {<a name="line.124"></a>
<span class="sourceLineNo">125</span> doWork();<a name="line.125"></a>
<span class="sourceLineNo">126</span> } catch (Throwable t) {<a name="line.126"></a>
<span class="sourceLineNo">127</span> ctx.threadFailed(t);<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span> ctx.threadDone();<a name="line.129"></a>
<span class="sourceLineNo">130</span> }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span> public abstract void doWork() throws Exception;<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span> protected void stopTestThread() {<a name="line.134"></a>
<span class="sourceLineNo">135</span> this.stopped = true;<a name="line.135"></a>
<span class="sourceLineNo">136</span> }<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span> /**<a name="line.139"></a>
<span class="sourceLineNo">140</span> * A test thread that performs a repeating operation.<a name="line.140"></a>
<span class="sourceLineNo">141</span> */<a name="line.141"></a>
<span class="sourceLineNo">142</span> public static abstract class RepeatingTestThread extends TestThread {<a name="line.142"></a>
<span class="sourceLineNo">143</span> public RepeatingTestThread(TestContext ctx) {<a name="line.143"></a>
<span class="sourceLineNo">144</span> super(ctx);<a name="line.144"></a>
<span class="sourceLineNo">145</span> }<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span> @Override<a name="line.147"></a>
<span class="sourceLineNo">148</span> public final void doWork() throws Exception {<a name="line.148"></a>
<span class="sourceLineNo">149</span> try {<a name="line.149"></a>
<span class="sourceLineNo">150</span> while (ctx.shouldRun() &amp;&amp; !stopped) {<a name="line.150"></a>
<span class="sourceLineNo">151</span> doAnAction();<a name="line.151"></a>
<span class="sourceLineNo">152</span> }<a name="line.152"></a>
<span class="sourceLineNo">153</span> } finally {<a name="line.153"></a>
<span class="sourceLineNo">154</span> workDone();<a name="line.154"></a>
<span class="sourceLineNo">155</span> }<a name="line.155"></a>
<span class="sourceLineNo">156</span> }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span> public abstract void doAnAction() throws Exception;<a name="line.158"></a>
<span class="sourceLineNo">159</span> public void workDone() throws IOException {}<a name="line.159"></a>
<span class="sourceLineNo">160</span> }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span> /**<a name="line.162"></a>
<span class="sourceLineNo">163</span> * Verify that no assertions have failed inside a future.<a name="line.163"></a>
<span class="sourceLineNo">164</span> * Used for unit tests that spawn threads. E.g.,<a name="line.164"></a>
<span class="sourceLineNo">165</span> * &lt;p&gt;<a name="line.165"></a>
<span class="sourceLineNo">166</span> * &lt;pre&gt;<a name="line.166"></a>
<span class="sourceLineNo">167</span> * List&amp;lt;Future&amp;lt;Void&gt;&gt; results = Lists.newArrayList();<a name="line.167"></a>
<span class="sourceLineNo">168</span> * Future&amp;lt;Void&gt; f = executor.submit(new Callable&amp;lt;Void&gt; {<a name="line.168"></a>
<span class="sourceLineNo">169</span> * public Void call() {<a name="line.169"></a>
<span class="sourceLineNo">170</span> * assertTrue(someMethod());<a name="line.170"></a>
<span class="sourceLineNo">171</span> * }<a name="line.171"></a>
<span class="sourceLineNo">172</span> * });<a name="line.172"></a>
<span class="sourceLineNo">173</span> * results.add(f);<a name="line.173"></a>
<span class="sourceLineNo">174</span> * assertOnFutures(results);<a name="line.174"></a>
<span class="sourceLineNo">175</span> * &lt;/pre&gt;<a name="line.175"></a>
<span class="sourceLineNo">176</span> * @param threadResults A list of futures<a name="line.176"></a>
<span class="sourceLineNo">177</span> * @throws InterruptedException If interrupted when waiting for a result<a name="line.177"></a>
<span class="sourceLineNo">178</span> * from one of the futures<a name="line.178"></a>
<span class="sourceLineNo">179</span> * @throws ExecutionException If an exception other than AssertionError<a name="line.179"></a>
<span class="sourceLineNo">180</span> * occurs inside any of the futures<a name="line.180"></a>
<span class="sourceLineNo">181</span> */<a name="line.181"></a>
<span class="sourceLineNo">182</span> public static void assertOnFutures(List&lt;Future&lt;?&gt;&gt; threadResults)<a name="line.182"></a>
<span class="sourceLineNo">183</span> throws InterruptedException, ExecutionException {<a name="line.183"></a>
<span class="sourceLineNo">184</span> for (Future&lt;?&gt; threadResult : threadResults) {<a name="line.184"></a>
<span class="sourceLineNo">185</span> try {<a name="line.185"></a>
<span class="sourceLineNo">186</span> threadResult.get();<a name="line.186"></a>
<span class="sourceLineNo">187</span> } catch (ExecutionException e) {<a name="line.187"></a>
<span class="sourceLineNo">188</span> if (e.getCause() instanceof AssertionError) {<a name="line.188"></a>
<span class="sourceLineNo">189</span> throw (AssertionError) e.getCause();<a name="line.189"></a>
<span class="sourceLineNo">190</span> }<a name="line.190"></a>
<span class="sourceLineNo">191</span> throw e;<a name="line.191"></a>
<span class="sourceLineNo">192</span> }<a name="line.192"></a>
<span class="sourceLineNo">193</span> }<a name="line.193"></a>
<span class="sourceLineNo">194</span> }<a name="line.194"></a>
<span class="sourceLineNo">195</span>}<a name="line.195"></a>
</pre>
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