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<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.hadoop.lib.service.scheduler;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.hadoop.lib.lang.RunnableCallable;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.hadoop.lib.server.BaseService;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.hadoop.lib.server.Server;<a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.hadoop.lib.server.ServiceException;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.hadoop.lib.service.Instrumentation;<a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.hadoop.lib.service.Scheduler;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.hadoop.lib.util.Check;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.slf4j.Logger;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.slf4j.LoggerFactory;<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>    import java.text.MessageFormat;<a name="line.31"></a>
<FONT color="green">032</FONT>    import java.util.concurrent.Callable;<a name="line.32"></a>
<FONT color="green">033</FONT>    import java.util.concurrent.ScheduledExecutorService;<a name="line.33"></a>
<FONT color="green">034</FONT>    import java.util.concurrent.ScheduledThreadPoolExecutor;<a name="line.34"></a>
<FONT color="green">035</FONT>    import java.util.concurrent.TimeUnit;<a name="line.35"></a>
<FONT color="green">036</FONT>    <a name="line.36"></a>
<FONT color="green">037</FONT>    public class SchedulerService extends BaseService implements Scheduler {<a name="line.37"></a>
<FONT color="green">038</FONT>      private static final Logger LOG = LoggerFactory.getLogger(SchedulerService.class);<a name="line.38"></a>
<FONT color="green">039</FONT>    <a name="line.39"></a>
<FONT color="green">040</FONT>      private static final String INST_GROUP = "scheduler";<a name="line.40"></a>
<FONT color="green">041</FONT>    <a name="line.41"></a>
<FONT color="green">042</FONT>      public static final String PREFIX = "scheduler";<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>      public static final String CONF_THREADS = "threads";<a name="line.44"></a>
<FONT color="green">045</FONT>    <a name="line.45"></a>
<FONT color="green">046</FONT>      private ScheduledExecutorService scheduler;<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>      public SchedulerService() {<a name="line.48"></a>
<FONT color="green">049</FONT>        super(PREFIX);<a name="line.49"></a>
<FONT color="green">050</FONT>      }<a name="line.50"></a>
<FONT color="green">051</FONT>    <a name="line.51"></a>
<FONT color="green">052</FONT>      @Override<a name="line.52"></a>
<FONT color="green">053</FONT>      public void init() throws ServiceException {<a name="line.53"></a>
<FONT color="green">054</FONT>        int threads = getServiceConfig().getInt(CONF_THREADS, 5);<a name="line.54"></a>
<FONT color="green">055</FONT>        scheduler = new ScheduledThreadPoolExecutor(threads);<a name="line.55"></a>
<FONT color="green">056</FONT>        LOG.debug("Scheduler started");<a name="line.56"></a>
<FONT color="green">057</FONT>      }<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>      @Override<a name="line.59"></a>
<FONT color="green">060</FONT>      public void destroy() {<a name="line.60"></a>
<FONT color="green">061</FONT>        try {<a name="line.61"></a>
<FONT color="green">062</FONT>          long limit = System.currentTimeMillis() + 30 * 1000;<a name="line.62"></a>
<FONT color="green">063</FONT>          scheduler.shutdownNow();<a name="line.63"></a>
<FONT color="green">064</FONT>          while (!scheduler.awaitTermination(1000, TimeUnit.MILLISECONDS)) {<a name="line.64"></a>
<FONT color="green">065</FONT>            LOG.debug("Waiting for scheduler to shutdown");<a name="line.65"></a>
<FONT color="green">066</FONT>            if (System.currentTimeMillis() &gt; limit) {<a name="line.66"></a>
<FONT color="green">067</FONT>              LOG.warn("Gave up waiting for scheduler to shutdown");<a name="line.67"></a>
<FONT color="green">068</FONT>              break;<a name="line.68"></a>
<FONT color="green">069</FONT>            }<a name="line.69"></a>
<FONT color="green">070</FONT>          }<a name="line.70"></a>
<FONT color="green">071</FONT>          if (scheduler.isTerminated()) {<a name="line.71"></a>
<FONT color="green">072</FONT>            LOG.debug("Scheduler shutdown");<a name="line.72"></a>
<FONT color="green">073</FONT>          }<a name="line.73"></a>
<FONT color="green">074</FONT>        } catch (InterruptedException ex) {<a name="line.74"></a>
<FONT color="green">075</FONT>          LOG.warn(ex.getMessage(), ex);<a name="line.75"></a>
<FONT color="green">076</FONT>        }<a name="line.76"></a>
<FONT color="green">077</FONT>      }<a name="line.77"></a>
<FONT color="green">078</FONT>    <a name="line.78"></a>
<FONT color="green">079</FONT>      @Override<a name="line.79"></a>
<FONT color="green">080</FONT>      public Class[] getServiceDependencies() {<a name="line.80"></a>
<FONT color="green">081</FONT>        return new Class[]{Instrumentation.class};<a name="line.81"></a>
<FONT color="green">082</FONT>      }<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>      @Override<a name="line.84"></a>
<FONT color="green">085</FONT>      public Class getInterface() {<a name="line.85"></a>
<FONT color="green">086</FONT>        return Scheduler.class;<a name="line.86"></a>
<FONT color="green">087</FONT>      }<a name="line.87"></a>
<FONT color="green">088</FONT>    <a name="line.88"></a>
<FONT color="green">089</FONT>      @Override<a name="line.89"></a>
<FONT color="green">090</FONT>      public void schedule(final Callable&lt;?&gt; callable, long delay, long interval, TimeUnit unit) {<a name="line.90"></a>
<FONT color="green">091</FONT>        Check.notNull(callable, "callable");<a name="line.91"></a>
<FONT color="green">092</FONT>        if (!scheduler.isShutdown()) {<a name="line.92"></a>
<FONT color="green">093</FONT>          LOG.debug("Scheduling callable [{}], interval [{}] seconds, delay [{}] in [{}]",<a name="line.93"></a>
<FONT color="green">094</FONT>                    new Object[]{callable, delay, interval, unit});<a name="line.94"></a>
<FONT color="green">095</FONT>          Runnable r = new Runnable() {<a name="line.95"></a>
<FONT color="green">096</FONT>            public void run() {<a name="line.96"></a>
<FONT color="green">097</FONT>              String instrName = callable.getClass().getSimpleName();<a name="line.97"></a>
<FONT color="green">098</FONT>              Instrumentation instr = getServer().get(Instrumentation.class);<a name="line.98"></a>
<FONT color="green">099</FONT>              if (getServer().getStatus() == Server.Status.HALTED) {<a name="line.99"></a>
<FONT color="green">100</FONT>                LOG.debug("Skipping [{}], server status [{}]", callable, getServer().getStatus());<a name="line.100"></a>
<FONT color="green">101</FONT>                instr.incr(INST_GROUP, instrName + ".skips", 1);<a name="line.101"></a>
<FONT color="green">102</FONT>              } else {<a name="line.102"></a>
<FONT color="green">103</FONT>                LOG.debug("Executing [{}]", callable);<a name="line.103"></a>
<FONT color="green">104</FONT>                instr.incr(INST_GROUP, instrName + ".execs", 1);<a name="line.104"></a>
<FONT color="green">105</FONT>                Instrumentation.Cron cron = instr.createCron().start();<a name="line.105"></a>
<FONT color="green">106</FONT>                try {<a name="line.106"></a>
<FONT color="green">107</FONT>                  callable.call();<a name="line.107"></a>
<FONT color="green">108</FONT>                } catch (Exception ex) {<a name="line.108"></a>
<FONT color="green">109</FONT>                  instr.incr(INST_GROUP, instrName + ".fails", 1);<a name="line.109"></a>
<FONT color="green">110</FONT>                  LOG.error("Error executing [{}], {}", new Object[]{callable, ex.getMessage(), ex});<a name="line.110"></a>
<FONT color="green">111</FONT>                } finally {<a name="line.111"></a>
<FONT color="green">112</FONT>                  instr.addCron(INST_GROUP, instrName, cron.stop());<a name="line.112"></a>
<FONT color="green">113</FONT>                }<a name="line.113"></a>
<FONT color="green">114</FONT>              }<a name="line.114"></a>
<FONT color="green">115</FONT>            }<a name="line.115"></a>
<FONT color="green">116</FONT>          };<a name="line.116"></a>
<FONT color="green">117</FONT>          scheduler.scheduleWithFixedDelay(r, delay, interval, unit);<a name="line.117"></a>
<FONT color="green">118</FONT>        } else {<a name="line.118"></a>
<FONT color="green">119</FONT>          throw new IllegalStateException(<a name="line.119"></a>
<FONT color="green">120</FONT>            MessageFormat.format("Scheduler shutting down, ignoring scheduling of [{}]", callable));<a name="line.120"></a>
<FONT color="green">121</FONT>        }<a name="line.121"></a>
<FONT color="green">122</FONT>      }<a name="line.122"></a>
<FONT color="green">123</FONT>    <a name="line.123"></a>
<FONT color="green">124</FONT>      @Override<a name="line.124"></a>
<FONT color="green">125</FONT>      public void schedule(Runnable runnable, long delay, long interval, TimeUnit unit) {<a name="line.125"></a>
<FONT color="green">126</FONT>        schedule((Callable&lt;?&gt;) new RunnableCallable(runnable), delay, interval, unit);<a name="line.126"></a>
<FONT color="green">127</FONT>      }<a name="line.127"></a>
<FONT color="green">128</FONT>    <a name="line.128"></a>
<FONT color="green">129</FONT>    }<a name="line.129"></a>




























































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