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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * AbstractMetricsContext.java<a name="line.2"></a>
<FONT color="green">003</FONT>     *<a name="line.3"></a>
<FONT color="green">004</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.4"></a>
<FONT color="green">005</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.5"></a>
<FONT color="green">006</FONT>     * distributed with this work for additional information<a name="line.6"></a>
<FONT color="green">007</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.7"></a>
<FONT color="green">008</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.8"></a>
<FONT color="green">009</FONT>     * "License"); you may not use this file except in compliance<a name="line.9"></a>
<FONT color="green">010</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.12"></a>
<FONT color="green">013</FONT>     *<a name="line.13"></a>
<FONT color="green">014</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.14"></a>
<FONT color="green">015</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.15"></a>
<FONT color="green">016</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.16"></a>
<FONT color="green">017</FONT>     * See the License for the specific language governing permissions and<a name="line.17"></a>
<FONT color="green">018</FONT>     * limitations under the License.<a name="line.18"></a>
<FONT color="green">019</FONT>     */<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    package org.apache.hadoop.metrics.spi;<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>    import java.io.IOException;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.util.ArrayList;<a name="line.24"></a>
<FONT color="green">025</FONT>    import java.util.Collection;<a name="line.25"></a>
<FONT color="green">026</FONT>    import java.util.HashMap;<a name="line.26"></a>
<FONT color="green">027</FONT>    import java.util.HashSet;<a name="line.27"></a>
<FONT color="green">028</FONT>    import java.util.Iterator;<a name="line.28"></a>
<FONT color="green">029</FONT>    import java.util.List;<a name="line.29"></a>
<FONT color="green">030</FONT>    import java.util.Map;<a name="line.30"></a>
<FONT color="green">031</FONT>    import java.util.Set;<a name="line.31"></a>
<FONT color="green">032</FONT>    import java.util.Timer;<a name="line.32"></a>
<FONT color="green">033</FONT>    import java.util.TimerTask;<a name="line.33"></a>
<FONT color="green">034</FONT>    import java.util.TreeMap;<a name="line.34"></a>
<FONT color="green">035</FONT>    import java.util.Map.Entry;<a name="line.35"></a>
<FONT color="green">036</FONT>    <a name="line.36"></a>
<FONT color="green">037</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.37"></a>
<FONT color="green">038</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.38"></a>
<FONT color="green">039</FONT>    import org.apache.hadoop.metrics.ContextFactory;<a name="line.39"></a>
<FONT color="green">040</FONT>    import org.apache.hadoop.metrics.MetricsContext;<a name="line.40"></a>
<FONT color="green">041</FONT>    import org.apache.hadoop.metrics.MetricsException;<a name="line.41"></a>
<FONT color="green">042</FONT>    import org.apache.hadoop.metrics.MetricsRecord;<a name="line.42"></a>
<FONT color="green">043</FONT>    import org.apache.hadoop.metrics.Updater;<a name="line.43"></a>
<FONT color="green">044</FONT>    <a name="line.44"></a>
<FONT color="green">045</FONT>    /**<a name="line.45"></a>
<FONT color="green">046</FONT>     * The main class of the Service Provider Interface.  This class should be<a name="line.46"></a>
<FONT color="green">047</FONT>     * extended in order to integrate the Metrics API with a specific metrics<a name="line.47"></a>
<FONT color="green">048</FONT>     * client library. &lt;p/&gt;<a name="line.48"></a>
<FONT color="green">049</FONT>     *<a name="line.49"></a>
<FONT color="green">050</FONT>     * This class implements the internal table of metric data, and the timer<a name="line.50"></a>
<FONT color="green">051</FONT>     * on which data is to be sent to the metrics system.  Subclasses must<a name="line.51"></a>
<FONT color="green">052</FONT>     * override the abstract &lt;code&gt;emitRecord&lt;/code&gt; method in order to transmit<a name="line.52"></a>
<FONT color="green">053</FONT>     * the data. &lt;p/&gt;<a name="line.53"></a>
<FONT color="green">054</FONT>     */<a name="line.54"></a>
<FONT color="green">055</FONT>    @InterfaceAudience.Public<a name="line.55"></a>
<FONT color="green">056</FONT>    @InterfaceStability.Evolving<a name="line.56"></a>
<FONT color="green">057</FONT>    public abstract class AbstractMetricsContext implements MetricsContext {<a name="line.57"></a>
<FONT color="green">058</FONT>        <a name="line.58"></a>
<FONT color="green">059</FONT>      private int period = MetricsContext.DEFAULT_PERIOD;<a name="line.59"></a>
<FONT color="green">060</FONT>      private Timer timer = null;<a name="line.60"></a>
<FONT color="green">061</FONT>        <a name="line.61"></a>
<FONT color="green">062</FONT>      private Set&lt;Updater&gt; updaters = new HashSet&lt;Updater&gt;(1);<a name="line.62"></a>
<FONT color="green">063</FONT>      private volatile boolean isMonitoring = false;<a name="line.63"></a>
<FONT color="green">064</FONT>        <a name="line.64"></a>
<FONT color="green">065</FONT>      private ContextFactory factory = null;<a name="line.65"></a>
<FONT color="green">066</FONT>      private String contextName = null;<a name="line.66"></a>
<FONT color="green">067</FONT>        <a name="line.67"></a>
<FONT color="green">068</FONT>      @InterfaceAudience.Private<a name="line.68"></a>
<FONT color="green">069</FONT>      public static class TagMap extends TreeMap&lt;String,Object&gt; {<a name="line.69"></a>
<FONT color="green">070</FONT>        private static final long serialVersionUID = 3546309335061952993L;<a name="line.70"></a>
<FONT color="green">071</FONT>        TagMap() {<a name="line.71"></a>
<FONT color="green">072</FONT>          super();<a name="line.72"></a>
<FONT color="green">073</FONT>        }<a name="line.73"></a>
<FONT color="green">074</FONT>        TagMap(TagMap orig) {<a name="line.74"></a>
<FONT color="green">075</FONT>          super(orig);<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>         * Returns true if this tagmap contains every tag in other.<a name="line.78"></a>
<FONT color="green">079</FONT>         */<a name="line.79"></a>
<FONT color="green">080</FONT>        public boolean containsAll(TagMap other) {<a name="line.80"></a>
<FONT color="green">081</FONT>          for (Map.Entry&lt;String,Object&gt; entry : other.entrySet()) {<a name="line.81"></a>
<FONT color="green">082</FONT>            Object value = get(entry.getKey());<a name="line.82"></a>
<FONT color="green">083</FONT>            if (value == null || !value.equals(entry.getValue())) {<a name="line.83"></a>
<FONT color="green">084</FONT>              // either key does not exist here, or the value is different<a name="line.84"></a>
<FONT color="green">085</FONT>              return false;<a name="line.85"></a>
<FONT color="green">086</FONT>            }<a name="line.86"></a>
<FONT color="green">087</FONT>          }<a name="line.87"></a>
<FONT color="green">088</FONT>          return true;<a name="line.88"></a>
<FONT color="green">089</FONT>        }<a name="line.89"></a>
<FONT color="green">090</FONT>      }<a name="line.90"></a>
<FONT color="green">091</FONT>      <a name="line.91"></a>
<FONT color="green">092</FONT>      @InterfaceAudience.Private<a name="line.92"></a>
<FONT color="green">093</FONT>      public static class MetricMap extends TreeMap&lt;String,Number&gt; {<a name="line.93"></a>
<FONT color="green">094</FONT>        private static final long serialVersionUID = -7495051861141631609L;<a name="line.94"></a>
<FONT color="green">095</FONT>        MetricMap() {<a name="line.95"></a>
<FONT color="green">096</FONT>          super();<a name="line.96"></a>
<FONT color="green">097</FONT>        }<a name="line.97"></a>
<FONT color="green">098</FONT>        MetricMap(MetricMap orig) {<a name="line.98"></a>
<FONT color="green">099</FONT>          super(orig);<a name="line.99"></a>
<FONT color="green">100</FONT>        }<a name="line.100"></a>
<FONT color="green">101</FONT>      }<a name="line.101"></a>
<FONT color="green">102</FONT>                <a name="line.102"></a>
<FONT color="green">103</FONT>      static class RecordMap extends HashMap&lt;TagMap,MetricMap&gt; {<a name="line.103"></a>
<FONT color="green">104</FONT>        private static final long serialVersionUID = 259835619700264611L;<a name="line.104"></a>
<FONT color="green">105</FONT>      }<a name="line.105"></a>
<FONT color="green">106</FONT>        <a name="line.106"></a>
<FONT color="green">107</FONT>      private Map&lt;String,RecordMap&gt; bufferedData = new HashMap&lt;String,RecordMap&gt;();<a name="line.107"></a>
<FONT color="green">108</FONT>        <a name="line.108"></a>
<FONT color="green">109</FONT>    <a name="line.109"></a>
<FONT color="green">110</FONT>      /**<a name="line.110"></a>
<FONT color="green">111</FONT>       * Creates a new instance of AbstractMetricsContext<a name="line.111"></a>
<FONT color="green">112</FONT>       */<a name="line.112"></a>
<FONT color="green">113</FONT>      protected AbstractMetricsContext() {<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>       * Initializes the context.<a name="line.117"></a>
<FONT color="green">118</FONT>       */<a name="line.118"></a>
<FONT color="green">119</FONT>      public void init(String contextName, ContextFactory factory) <a name="line.119"></a>
<FONT color="green">120</FONT>      {<a name="line.120"></a>
<FONT color="green">121</FONT>        this.contextName = contextName;<a name="line.121"></a>
<FONT color="green">122</FONT>        this.factory = factory;<a name="line.122"></a>
<FONT color="green">123</FONT>      }<a name="line.123"></a>
<FONT color="green">124</FONT>        <a name="line.124"></a>
<FONT color="green">125</FONT>      /**<a name="line.125"></a>
<FONT color="green">126</FONT>       * Convenience method for subclasses to access factory attributes.<a name="line.126"></a>
<FONT color="green">127</FONT>       */<a name="line.127"></a>
<FONT color="green">128</FONT>      protected String getAttribute(String attributeName) {<a name="line.128"></a>
<FONT color="green">129</FONT>        String factoryAttribute = contextName + "." + attributeName;<a name="line.129"></a>
<FONT color="green">130</FONT>        return (String) factory.getAttribute(factoryAttribute);  <a name="line.130"></a>
<FONT color="green">131</FONT>      }<a name="line.131"></a>
<FONT color="green">132</FONT>        <a name="line.132"></a>
<FONT color="green">133</FONT>      /**<a name="line.133"></a>
<FONT color="green">134</FONT>       * Returns an attribute-value map derived from the factory attributes<a name="line.134"></a>
<FONT color="green">135</FONT>       * by finding all factory attributes that begin with <a name="line.135"></a>
<FONT color="green">136</FONT>       * &lt;i&gt;contextName&lt;/i&gt;.&lt;i&gt;tableName&lt;/i&gt;.  The returned map consists of<a name="line.136"></a>
<FONT color="green">137</FONT>       * those attributes with the contextName and tableName stripped off.<a name="line.137"></a>
<FONT color="green">138</FONT>       */<a name="line.138"></a>
<FONT color="green">139</FONT>      protected Map&lt;String,String&gt; getAttributeTable(String tableName) {<a name="line.139"></a>
<FONT color="green">140</FONT>        String prefix = contextName + "." + tableName + ".";<a name="line.140"></a>
<FONT color="green">141</FONT>        Map&lt;String,String&gt; result = new HashMap&lt;String,String&gt;();<a name="line.141"></a>
<FONT color="green">142</FONT>        for (String attributeName : factory.getAttributeNames()) {<a name="line.142"></a>
<FONT color="green">143</FONT>          if (attributeName.startsWith(prefix)) {<a name="line.143"></a>
<FONT color="green">144</FONT>            String name = attributeName.substring(prefix.length());<a name="line.144"></a>
<FONT color="green">145</FONT>            String value = (String) factory.getAttribute(attributeName);<a name="line.145"></a>
<FONT color="green">146</FONT>            result.put(name, value);<a name="line.146"></a>
<FONT color="green">147</FONT>          }<a name="line.147"></a>
<FONT color="green">148</FONT>        }<a name="line.148"></a>
<FONT color="green">149</FONT>        return result;<a name="line.149"></a>
<FONT color="green">150</FONT>      }<a name="line.150"></a>
<FONT color="green">151</FONT>        <a name="line.151"></a>
<FONT color="green">152</FONT>      /**<a name="line.152"></a>
<FONT color="green">153</FONT>       * Returns the context name.<a name="line.153"></a>
<FONT color="green">154</FONT>       */<a name="line.154"></a>
<FONT color="green">155</FONT>      public String getContextName() {<a name="line.155"></a>
<FONT color="green">156</FONT>        return contextName;<a name="line.156"></a>
<FONT color="green">157</FONT>      }<a name="line.157"></a>
<FONT color="green">158</FONT>        <a name="line.158"></a>
<FONT color="green">159</FONT>      /**<a name="line.159"></a>
<FONT color="green">160</FONT>       * Returns the factory by which this context was created.<a name="line.160"></a>
<FONT color="green">161</FONT>       */<a name="line.161"></a>
<FONT color="green">162</FONT>      public ContextFactory getContextFactory() {<a name="line.162"></a>
<FONT color="green">163</FONT>        return factory;<a name="line.163"></a>
<FONT color="green">164</FONT>      }<a name="line.164"></a>
<FONT color="green">165</FONT>        <a name="line.165"></a>
<FONT color="green">166</FONT>      /**<a name="line.166"></a>
<FONT color="green">167</FONT>       * Starts or restarts monitoring, the emitting of metrics records.<a name="line.167"></a>
<FONT color="green">168</FONT>       */<a name="line.168"></a>
<FONT color="green">169</FONT>      public synchronized void startMonitoring()<a name="line.169"></a>
<FONT color="green">170</FONT>        throws IOException {<a name="line.170"></a>
<FONT color="green">171</FONT>        if (!isMonitoring) {<a name="line.171"></a>
<FONT color="green">172</FONT>          startTimer();<a name="line.172"></a>
<FONT color="green">173</FONT>          isMonitoring = true;<a name="line.173"></a>
<FONT color="green">174</FONT>        }<a name="line.174"></a>
<FONT color="green">175</FONT>      }<a name="line.175"></a>
<FONT color="green">176</FONT>        <a name="line.176"></a>
<FONT color="green">177</FONT>      /**<a name="line.177"></a>
<FONT color="green">178</FONT>       * Stops monitoring.  This does not free buffered data. <a name="line.178"></a>
<FONT color="green">179</FONT>       * @see #close()<a name="line.179"></a>
<FONT color="green">180</FONT>       */<a name="line.180"></a>
<FONT color="green">181</FONT>      public synchronized void stopMonitoring() {<a name="line.181"></a>
<FONT color="green">182</FONT>        if (isMonitoring) {<a name="line.182"></a>
<FONT color="green">183</FONT>          stopTimer();<a name="line.183"></a>
<FONT color="green">184</FONT>          isMonitoring = false;<a name="line.184"></a>
<FONT color="green">185</FONT>        }<a name="line.185"></a>
<FONT color="green">186</FONT>      }<a name="line.186"></a>
<FONT color="green">187</FONT>        <a name="line.187"></a>
<FONT color="green">188</FONT>      /**<a name="line.188"></a>
<FONT color="green">189</FONT>       * Returns true if monitoring is currently in progress.<a name="line.189"></a>
<FONT color="green">190</FONT>       */<a name="line.190"></a>
<FONT color="green">191</FONT>      public boolean isMonitoring() {<a name="line.191"></a>
<FONT color="green">192</FONT>        return isMonitoring;<a name="line.192"></a>
<FONT color="green">193</FONT>      }<a name="line.193"></a>
<FONT color="green">194</FONT>        <a name="line.194"></a>
<FONT color="green">195</FONT>      /**<a name="line.195"></a>
<FONT color="green">196</FONT>       * Stops monitoring and frees buffered data, returning this<a name="line.196"></a>
<FONT color="green">197</FONT>       * object to its initial state.  <a name="line.197"></a>
<FONT color="green">198</FONT>       */<a name="line.198"></a>
<FONT color="green">199</FONT>      public synchronized void close() {<a name="line.199"></a>
<FONT color="green">200</FONT>        stopMonitoring();<a name="line.200"></a>
<FONT color="green">201</FONT>        clearUpdaters();<a name="line.201"></a>
<FONT color="green">202</FONT>      } <a name="line.202"></a>
<FONT color="green">203</FONT>        <a name="line.203"></a>
<FONT color="green">204</FONT>      /**<a name="line.204"></a>
<FONT color="green">205</FONT>       * Creates a new AbstractMetricsRecord instance with the given &lt;code&gt;recordName&lt;/code&gt;.<a name="line.205"></a>
<FONT color="green">206</FONT>       * Throws an exception if the metrics implementation is configured with a fixed<a name="line.206"></a>
<FONT color="green">207</FONT>       * set of record names and &lt;code&gt;recordName&lt;/code&gt; is not in that set.<a name="line.207"></a>
<FONT color="green">208</FONT>       * <a name="line.208"></a>
<FONT color="green">209</FONT>       * @param recordName the name of the record<a name="line.209"></a>
<FONT color="green">210</FONT>       * @throws MetricsException if recordName conflicts with configuration data<a name="line.210"></a>
<FONT color="green">211</FONT>       */<a name="line.211"></a>
<FONT color="green">212</FONT>      public final synchronized MetricsRecord createRecord(String recordName) {<a name="line.212"></a>
<FONT color="green">213</FONT>        if (bufferedData.get(recordName) == null) {<a name="line.213"></a>
<FONT color="green">214</FONT>          bufferedData.put(recordName, new RecordMap());<a name="line.214"></a>
<FONT color="green">215</FONT>        }<a name="line.215"></a>
<FONT color="green">216</FONT>        return newRecord(recordName);<a name="line.216"></a>
<FONT color="green">217</FONT>      }<a name="line.217"></a>
<FONT color="green">218</FONT>        <a name="line.218"></a>
<FONT color="green">219</FONT>      /**<a name="line.219"></a>
<FONT color="green">220</FONT>       * Subclasses should override this if they subclass MetricsRecordImpl.<a name="line.220"></a>
<FONT color="green">221</FONT>       * @param recordName the name of the record<a name="line.221"></a>
<FONT color="green">222</FONT>       * @return newly created instance of MetricsRecordImpl or subclass<a name="line.222"></a>
<FONT color="green">223</FONT>       */<a name="line.223"></a>
<FONT color="green">224</FONT>      protected MetricsRecord newRecord(String recordName) {<a name="line.224"></a>
<FONT color="green">225</FONT>        return new MetricsRecordImpl(recordName, this);<a name="line.225"></a>
<FONT color="green">226</FONT>      }<a name="line.226"></a>
<FONT color="green">227</FONT>        <a name="line.227"></a>
<FONT color="green">228</FONT>      /**<a name="line.228"></a>
<FONT color="green">229</FONT>       * Registers a callback to be called at time intervals determined by<a name="line.229"></a>
<FONT color="green">230</FONT>       * the configuration.<a name="line.230"></a>
<FONT color="green">231</FONT>       *<a name="line.231"></a>
<FONT color="green">232</FONT>       * @param updater object to be run periodically; it should update<a name="line.232"></a>
<FONT color="green">233</FONT>       * some metrics records <a name="line.233"></a>
<FONT color="green">234</FONT>       */<a name="line.234"></a>
<FONT color="green">235</FONT>      public synchronized void registerUpdater(final Updater updater) {<a name="line.235"></a>
<FONT color="green">236</FONT>        if (!updaters.contains(updater)) {<a name="line.236"></a>
<FONT color="green">237</FONT>          updaters.add(updater);<a name="line.237"></a>
<FONT color="green">238</FONT>        }<a name="line.238"></a>
<FONT color="green">239</FONT>      }<a name="line.239"></a>
<FONT color="green">240</FONT>        <a name="line.240"></a>
<FONT color="green">241</FONT>      /**<a name="line.241"></a>
<FONT color="green">242</FONT>       * Removes a callback, if it exists.<a name="line.242"></a>
<FONT color="green">243</FONT>       *<a name="line.243"></a>
<FONT color="green">244</FONT>       * @param updater object to be removed from the callback list<a name="line.244"></a>
<FONT color="green">245</FONT>       */<a name="line.245"></a>
<FONT color="green">246</FONT>      public synchronized void unregisterUpdater(Updater updater) {<a name="line.246"></a>
<FONT color="green">247</FONT>        updaters.remove(updater);<a name="line.247"></a>
<FONT color="green">248</FONT>      }<a name="line.248"></a>
<FONT color="green">249</FONT>        <a name="line.249"></a>
<FONT color="green">250</FONT>      private synchronized void clearUpdaters() {<a name="line.250"></a>
<FONT color="green">251</FONT>        updaters.clear();<a name="line.251"></a>
<FONT color="green">252</FONT>      }<a name="line.252"></a>
<FONT color="green">253</FONT>        <a name="line.253"></a>
<FONT color="green">254</FONT>      /**<a name="line.254"></a>
<FONT color="green">255</FONT>       * Starts timer if it is not already started<a name="line.255"></a>
<FONT color="green">256</FONT>       */<a name="line.256"></a>
<FONT color="green">257</FONT>      private synchronized void startTimer() {<a name="line.257"></a>
<FONT color="green">258</FONT>        if (timer == null) {<a name="line.258"></a>
<FONT color="green">259</FONT>          timer = new Timer("Timer thread for monitoring " + getContextName(), <a name="line.259"></a>
<FONT color="green">260</FONT>                            true);<a name="line.260"></a>
<FONT color="green">261</FONT>          TimerTask task = new TimerTask() {<a name="line.261"></a>
<FONT color="green">262</FONT>              public void run() {<a name="line.262"></a>
<FONT color="green">263</FONT>                try {<a name="line.263"></a>
<FONT color="green">264</FONT>                  timerEvent();<a name="line.264"></a>
<FONT color="green">265</FONT>                }<a name="line.265"></a>
<FONT color="green">266</FONT>                catch (IOException ioe) {<a name="line.266"></a>
<FONT color="green">267</FONT>                  ioe.printStackTrace();<a name="line.267"></a>
<FONT color="green">268</FONT>                }<a name="line.268"></a>
<FONT color="green">269</FONT>              }<a name="line.269"></a>
<FONT color="green">270</FONT>            };<a name="line.270"></a>
<FONT color="green">271</FONT>          long millis = period * 1000;<a name="line.271"></a>
<FONT color="green">272</FONT>          timer.scheduleAtFixedRate(task, millis, millis);<a name="line.272"></a>
<FONT color="green">273</FONT>        }<a name="line.273"></a>
<FONT color="green">274</FONT>      }<a name="line.274"></a>
<FONT color="green">275</FONT>        <a name="line.275"></a>
<FONT color="green">276</FONT>      /**<a name="line.276"></a>
<FONT color="green">277</FONT>       * Stops timer if it is running<a name="line.277"></a>
<FONT color="green">278</FONT>       */<a name="line.278"></a>
<FONT color="green">279</FONT>      private synchronized void stopTimer() {<a name="line.279"></a>
<FONT color="green">280</FONT>        if (timer != null) {<a name="line.280"></a>
<FONT color="green">281</FONT>          timer.cancel();<a name="line.281"></a>
<FONT color="green">282</FONT>          timer = null;<a name="line.282"></a>
<FONT color="green">283</FONT>        }<a name="line.283"></a>
<FONT color="green">284</FONT>      }<a name="line.284"></a>
<FONT color="green">285</FONT>        <a name="line.285"></a>
<FONT color="green">286</FONT>      /**<a name="line.286"></a>
<FONT color="green">287</FONT>       * Timer callback.<a name="line.287"></a>
<FONT color="green">288</FONT>       */<a name="line.288"></a>
<FONT color="green">289</FONT>      private void timerEvent() throws IOException {<a name="line.289"></a>
<FONT color="green">290</FONT>        if (isMonitoring) {<a name="line.290"></a>
<FONT color="green">291</FONT>          Collection&lt;Updater&gt; myUpdaters;<a name="line.291"></a>
<FONT color="green">292</FONT>          synchronized (this) {<a name="line.292"></a>
<FONT color="green">293</FONT>            myUpdaters = new ArrayList&lt;Updater&gt;(updaters);<a name="line.293"></a>
<FONT color="green">294</FONT>          }     <a name="line.294"></a>
<FONT color="green">295</FONT>          // Run all the registered updates without holding a lock<a name="line.295"></a>
<FONT color="green">296</FONT>          // on this context<a name="line.296"></a>
<FONT color="green">297</FONT>          for (Updater updater : myUpdaters) {<a name="line.297"></a>
<FONT color="green">298</FONT>            try {<a name="line.298"></a>
<FONT color="green">299</FONT>              updater.doUpdates(this);<a name="line.299"></a>
<FONT color="green">300</FONT>            }<a name="line.300"></a>
<FONT color="green">301</FONT>            catch (Throwable throwable) {<a name="line.301"></a>
<FONT color="green">302</FONT>              throwable.printStackTrace();<a name="line.302"></a>
<FONT color="green">303</FONT>            }<a name="line.303"></a>
<FONT color="green">304</FONT>          }<a name="line.304"></a>
<FONT color="green">305</FONT>          emitRecords();<a name="line.305"></a>
<FONT color="green">306</FONT>        }<a name="line.306"></a>
<FONT color="green">307</FONT>      }<a name="line.307"></a>
<FONT color="green">308</FONT>        <a name="line.308"></a>
<FONT color="green">309</FONT>      /**<a name="line.309"></a>
<FONT color="green">310</FONT>       *  Emits the records.<a name="line.310"></a>
<FONT color="green">311</FONT>       */<a name="line.311"></a>
<FONT color="green">312</FONT>      private synchronized void emitRecords() throws IOException {<a name="line.312"></a>
<FONT color="green">313</FONT>        for (String recordName : bufferedData.keySet()) {<a name="line.313"></a>
<FONT color="green">314</FONT>          RecordMap recordMap = bufferedData.get(recordName);<a name="line.314"></a>
<FONT color="green">315</FONT>          synchronized (recordMap) {<a name="line.315"></a>
<FONT color="green">316</FONT>            Set&lt;Entry&lt;TagMap, MetricMap&gt;&gt; entrySet = recordMap.entrySet ();<a name="line.316"></a>
<FONT color="green">317</FONT>            for (Entry&lt;TagMap, MetricMap&gt; entry : entrySet) {<a name="line.317"></a>
<FONT color="green">318</FONT>              OutputRecord outRec = new OutputRecord(entry.getKey(), entry.getValue());<a name="line.318"></a>
<FONT color="green">319</FONT>              emitRecord(contextName, recordName, outRec);<a name="line.319"></a>
<FONT color="green">320</FONT>            }<a name="line.320"></a>
<FONT color="green">321</FONT>          }<a name="line.321"></a>
<FONT color="green">322</FONT>        }<a name="line.322"></a>
<FONT color="green">323</FONT>        flush();<a name="line.323"></a>
<FONT color="green">324</FONT>      }<a name="line.324"></a>
<FONT color="green">325</FONT>      <a name="line.325"></a>
<FONT color="green">326</FONT>      /**<a name="line.326"></a>
<FONT color="green">327</FONT>       * Retrieves all the records managed by this MetricsContext.<a name="line.327"></a>
<FONT color="green">328</FONT>       * Useful for monitoring systems that are polling-based.<a name="line.328"></a>
<FONT color="green">329</FONT>       * @return A non-null collection of all monitoring records.<a name="line.329"></a>
<FONT color="green">330</FONT>       */<a name="line.330"></a>
<FONT color="green">331</FONT>      public synchronized Map&lt;String, Collection&lt;OutputRecord&gt;&gt; getAllRecords() {<a name="line.331"></a>
<FONT color="green">332</FONT>        Map&lt;String, Collection&lt;OutputRecord&gt;&gt; out = new TreeMap&lt;String, Collection&lt;OutputRecord&gt;&gt;();<a name="line.332"></a>
<FONT color="green">333</FONT>        for (String recordName : bufferedData.keySet()) {<a name="line.333"></a>
<FONT color="green">334</FONT>          RecordMap recordMap = bufferedData.get(recordName);<a name="line.334"></a>
<FONT color="green">335</FONT>          synchronized (recordMap) {<a name="line.335"></a>
<FONT color="green">336</FONT>            List&lt;OutputRecord&gt; records = new ArrayList&lt;OutputRecord&gt;();<a name="line.336"></a>
<FONT color="green">337</FONT>            Set&lt;Entry&lt;TagMap, MetricMap&gt;&gt; entrySet = recordMap.entrySet();<a name="line.337"></a>
<FONT color="green">338</FONT>            for (Entry&lt;TagMap, MetricMap&gt; entry : entrySet) {<a name="line.338"></a>
<FONT color="green">339</FONT>              OutputRecord outRec = new OutputRecord(entry.getKey(), entry.getValue());<a name="line.339"></a>
<FONT color="green">340</FONT>              records.add(outRec);<a name="line.340"></a>
<FONT color="green">341</FONT>            }<a name="line.341"></a>
<FONT color="green">342</FONT>            out.put(recordName, records);<a name="line.342"></a>
<FONT color="green">343</FONT>          }<a name="line.343"></a>
<FONT color="green">344</FONT>        }<a name="line.344"></a>
<FONT color="green">345</FONT>        return out;<a name="line.345"></a>
<FONT color="green">346</FONT>      }<a name="line.346"></a>
<FONT color="green">347</FONT>    <a name="line.347"></a>
<FONT color="green">348</FONT>      /**<a name="line.348"></a>
<FONT color="green">349</FONT>       * Sends a record to the metrics system.<a name="line.349"></a>
<FONT color="green">350</FONT>       */<a name="line.350"></a>
<FONT color="green">351</FONT>      protected abstract void emitRecord(String contextName, String recordName, <a name="line.351"></a>
<FONT color="green">352</FONT>                                         OutputRecord outRec) throws IOException;<a name="line.352"></a>
<FONT color="green">353</FONT>        <a name="line.353"></a>
<FONT color="green">354</FONT>      /**<a name="line.354"></a>
<FONT color="green">355</FONT>       * Called each period after all records have been emitted, this method does nothing.<a name="line.355"></a>
<FONT color="green">356</FONT>       * Subclasses may override it in order to perform some kind of flush.<a name="line.356"></a>
<FONT color="green">357</FONT>       */<a name="line.357"></a>
<FONT color="green">358</FONT>      protected void flush() throws IOException {<a name="line.358"></a>
<FONT color="green">359</FONT>      }<a name="line.359"></a>
<FONT color="green">360</FONT>        <a name="line.360"></a>
<FONT color="green">361</FONT>      /**<a name="line.361"></a>
<FONT color="green">362</FONT>       * Called by MetricsRecordImpl.update().  Creates or updates a row in<a name="line.362"></a>
<FONT color="green">363</FONT>       * the internal table of metric data.<a name="line.363"></a>
<FONT color="green">364</FONT>       */<a name="line.364"></a>
<FONT color="green">365</FONT>      protected void update(MetricsRecordImpl record) {<a name="line.365"></a>
<FONT color="green">366</FONT>        String recordName = record.getRecordName();<a name="line.366"></a>
<FONT color="green">367</FONT>        TagMap tagTable = record.getTagTable();<a name="line.367"></a>
<FONT color="green">368</FONT>        Map&lt;String,MetricValue&gt; metricUpdates = record.getMetricTable();<a name="line.368"></a>
<FONT color="green">369</FONT>            <a name="line.369"></a>
<FONT color="green">370</FONT>        RecordMap recordMap = getRecordMap(recordName);<a name="line.370"></a>
<FONT color="green">371</FONT>        synchronized (recordMap) {<a name="line.371"></a>
<FONT color="green">372</FONT>          MetricMap metricMap = recordMap.get(tagTable);<a name="line.372"></a>
<FONT color="green">373</FONT>          if (metricMap == null) {<a name="line.373"></a>
<FONT color="green">374</FONT>            metricMap = new MetricMap();<a name="line.374"></a>
<FONT color="green">375</FONT>            TagMap tagMap = new TagMap(tagTable); // clone tags<a name="line.375"></a>
<FONT color="green">376</FONT>            recordMap.put(tagMap, metricMap);<a name="line.376"></a>
<FONT color="green">377</FONT>          }<a name="line.377"></a>
<FONT color="green">378</FONT>    <a name="line.378"></a>
<FONT color="green">379</FONT>          Set&lt;Entry&lt;String, MetricValue&gt;&gt; entrySet = metricUpdates.entrySet();<a name="line.379"></a>
<FONT color="green">380</FONT>          for (Entry&lt;String, MetricValue&gt; entry : entrySet) {<a name="line.380"></a>
<FONT color="green">381</FONT>            String metricName = entry.getKey ();<a name="line.381"></a>
<FONT color="green">382</FONT>            MetricValue updateValue = entry.getValue ();<a name="line.382"></a>
<FONT color="green">383</FONT>            Number updateNumber = updateValue.getNumber();<a name="line.383"></a>
<FONT color="green">384</FONT>            Number currentNumber = metricMap.get(metricName);<a name="line.384"></a>
<FONT color="green">385</FONT>            if (currentNumber == null || updateValue.isAbsolute()) {<a name="line.385"></a>
<FONT color="green">386</FONT>              metricMap.put(metricName, updateNumber);<a name="line.386"></a>
<FONT color="green">387</FONT>            }<a name="line.387"></a>
<FONT color="green">388</FONT>            else {<a name="line.388"></a>
<FONT color="green">389</FONT>              Number newNumber = sum(updateNumber, currentNumber);<a name="line.389"></a>
<FONT color="green">390</FONT>              metricMap.put(metricName, newNumber);<a name="line.390"></a>
<FONT color="green">391</FONT>            }<a name="line.391"></a>
<FONT color="green">392</FONT>          }<a name="line.392"></a>
<FONT color="green">393</FONT>        }<a name="line.393"></a>
<FONT color="green">394</FONT>      }<a name="line.394"></a>
<FONT color="green">395</FONT>        <a name="line.395"></a>
<FONT color="green">396</FONT>      private synchronized RecordMap getRecordMap(String recordName) {<a name="line.396"></a>
<FONT color="green">397</FONT>        return bufferedData.get(recordName);<a name="line.397"></a>
<FONT color="green">398</FONT>      }<a name="line.398"></a>
<FONT color="green">399</FONT>        <a name="line.399"></a>
<FONT color="green">400</FONT>      /**<a name="line.400"></a>
<FONT color="green">401</FONT>       * Adds two numbers, coercing the second to the type of the first.<a name="line.401"></a>
<FONT color="green">402</FONT>       *<a name="line.402"></a>
<FONT color="green">403</FONT>       */<a name="line.403"></a>
<FONT color="green">404</FONT>      private Number sum(Number a, Number b) {<a name="line.404"></a>
<FONT color="green">405</FONT>        if (a instanceof Integer) {<a name="line.405"></a>
<FONT color="green">406</FONT>          return Integer.valueOf(a.intValue() + b.intValue());<a name="line.406"></a>
<FONT color="green">407</FONT>        }<a name="line.407"></a>
<FONT color="green">408</FONT>        else if (a instanceof Float) {<a name="line.408"></a>
<FONT color="green">409</FONT>          return new Float(a.floatValue() + b.floatValue());<a name="line.409"></a>
<FONT color="green">410</FONT>        }<a name="line.410"></a>
<FONT color="green">411</FONT>        else if (a instanceof Short) {<a name="line.411"></a>
<FONT color="green">412</FONT>          return Short.valueOf((short)(a.shortValue() + b.shortValue()));<a name="line.412"></a>
<FONT color="green">413</FONT>        }<a name="line.413"></a>
<FONT color="green">414</FONT>        else if (a instanceof Byte) {<a name="line.414"></a>
<FONT color="green">415</FONT>          return Byte.valueOf((byte)(a.byteValue() + b.byteValue()));<a name="line.415"></a>
<FONT color="green">416</FONT>        }<a name="line.416"></a>
<FONT color="green">417</FONT>        else if (a instanceof Long) {<a name="line.417"></a>
<FONT color="green">418</FONT>          return Long.valueOf((a.longValue() + b.longValue()));<a name="line.418"></a>
<FONT color="green">419</FONT>        }<a name="line.419"></a>
<FONT color="green">420</FONT>        else {<a name="line.420"></a>
<FONT color="green">421</FONT>          // should never happen<a name="line.421"></a>
<FONT color="green">422</FONT>          throw new MetricsException("Invalid number type");<a name="line.422"></a>
<FONT color="green">423</FONT>        }<a name="line.423"></a>
<FONT color="green">424</FONT>                <a name="line.424"></a>
<FONT color="green">425</FONT>      }<a name="line.425"></a>
<FONT color="green">426</FONT>        <a name="line.426"></a>
<FONT color="green">427</FONT>      /**<a name="line.427"></a>
<FONT color="green">428</FONT>       * Called by MetricsRecordImpl.remove().  Removes all matching rows in<a name="line.428"></a>
<FONT color="green">429</FONT>       * the internal table of metric data.  A row matches if it has the same<a name="line.429"></a>
<FONT color="green">430</FONT>       * tag names and values as record, but it may also have additional<a name="line.430"></a>
<FONT color="green">431</FONT>       * tags.<a name="line.431"></a>
<FONT color="green">432</FONT>       */    <a name="line.432"></a>
<FONT color="green">433</FONT>      protected void remove(MetricsRecordImpl record) {<a name="line.433"></a>
<FONT color="green">434</FONT>        String recordName = record.getRecordName();<a name="line.434"></a>
<FONT color="green">435</FONT>        TagMap tagTable = record.getTagTable();<a name="line.435"></a>
<FONT color="green">436</FONT>            <a name="line.436"></a>
<FONT color="green">437</FONT>        RecordMap recordMap = getRecordMap(recordName);<a name="line.437"></a>
<FONT color="green">438</FONT>        synchronized (recordMap) {<a name="line.438"></a>
<FONT color="green">439</FONT>          Iterator&lt;TagMap&gt; it = recordMap.keySet().iterator();<a name="line.439"></a>
<FONT color="green">440</FONT>          while (it.hasNext()) {<a name="line.440"></a>
<FONT color="green">441</FONT>            TagMap rowTags = it.next();<a name="line.441"></a>
<FONT color="green">442</FONT>            if (rowTags.containsAll(tagTable)) {<a name="line.442"></a>
<FONT color="green">443</FONT>              it.remove();<a name="line.443"></a>
<FONT color="green">444</FONT>            }<a name="line.444"></a>
<FONT color="green">445</FONT>          }<a name="line.445"></a>
<FONT color="green">446</FONT>        }<a name="line.446"></a>
<FONT color="green">447</FONT>      }<a name="line.447"></a>
<FONT color="green">448</FONT>        <a name="line.448"></a>
<FONT color="green">449</FONT>      /**<a name="line.449"></a>
<FONT color="green">450</FONT>       * Returns the timer period.<a name="line.450"></a>
<FONT color="green">451</FONT>       */<a name="line.451"></a>
<FONT color="green">452</FONT>      public int getPeriod() {<a name="line.452"></a>
<FONT color="green">453</FONT>        return period;<a name="line.453"></a>
<FONT color="green">454</FONT>      }<a name="line.454"></a>
<FONT color="green">455</FONT>        <a name="line.455"></a>
<FONT color="green">456</FONT>      /**<a name="line.456"></a>
<FONT color="green">457</FONT>       * Sets the timer period<a name="line.457"></a>
<FONT color="green">458</FONT>       */<a name="line.458"></a>
<FONT color="green">459</FONT>      protected void setPeriod(int period) {<a name="line.459"></a>
<FONT color="green">460</FONT>        this.period = period;<a name="line.460"></a>
<FONT color="green">461</FONT>      }<a name="line.461"></a>
<FONT color="green">462</FONT>      <a name="line.462"></a>
<FONT color="green">463</FONT>      /**<a name="line.463"></a>
<FONT color="green">464</FONT>       * If a period is set in the attribute passed in, override<a name="line.464"></a>
<FONT color="green">465</FONT>       * the default with it.<a name="line.465"></a>
<FONT color="green">466</FONT>       */<a name="line.466"></a>
<FONT color="green">467</FONT>      protected void parseAndSetPeriod(String attributeName) {<a name="line.467"></a>
<FONT color="green">468</FONT>        String periodStr = getAttribute(attributeName);<a name="line.468"></a>
<FONT color="green">469</FONT>        if (periodStr != null) {<a name="line.469"></a>
<FONT color="green">470</FONT>          int period = 0;<a name="line.470"></a>
<FONT color="green">471</FONT>          try {<a name="line.471"></a>
<FONT color="green">472</FONT>            period = Integer.parseInt(periodStr);<a name="line.472"></a>
<FONT color="green">473</FONT>          } catch (NumberFormatException nfe) {<a name="line.473"></a>
<FONT color="green">474</FONT>          }<a name="line.474"></a>
<FONT color="green">475</FONT>          if (period &lt;= 0) {<a name="line.475"></a>
<FONT color="green">476</FONT>            throw new MetricsException("Invalid period: " + periodStr);<a name="line.476"></a>
<FONT color="green">477</FONT>          }<a name="line.477"></a>
<FONT color="green">478</FONT>          setPeriod(period);<a name="line.478"></a>
<FONT color="green">479</FONT>        }<a name="line.479"></a>
<FONT color="green">480</FONT>      }<a name="line.480"></a>
<FONT color="green">481</FONT>    }<a name="line.481"></a>




























































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