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<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<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.regionserver;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Collections;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.Map;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.concurrent.atomic.LongAdder;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.metrics2.MetricHistogram;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.metrics2.MetricsCollector;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.metrics2.MetricsRecordBuilder;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.metrics2.lib.DynamicMetricsRegistry;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.slf4j.Logger;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.slf4j.LoggerFactory;<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>@InterfaceAudience.Private<a name="line.35"></a>
<span class="sourceLineNo">036</span>public class MetricsUserSourceImpl implements MetricsUserSource {<a name="line.36"></a>
<span class="sourceLineNo">037</span> private static final Logger LOG = LoggerFactory.getLogger(MetricsUserSourceImpl.class);<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span> private final String userNamePrefix;<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> private final String user;<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span> private final String userGetKey;<a name="line.43"></a>
<span class="sourceLineNo">044</span> private final String userScanTimeKey;<a name="line.44"></a>
<span class="sourceLineNo">045</span> private final String userPutKey;<a name="line.45"></a>
<span class="sourceLineNo">046</span> private final String userDeleteKey;<a name="line.46"></a>
<span class="sourceLineNo">047</span> private final String userIncrementKey;<a name="line.47"></a>
<span class="sourceLineNo">048</span> private final String userAppendKey;<a name="line.48"></a>
<span class="sourceLineNo">049</span> private final String userReplayKey;<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> private MetricHistogram getHisto;<a name="line.51"></a>
<span class="sourceLineNo">052</span> private MetricHistogram scanTimeHisto;<a name="line.52"></a>
<span class="sourceLineNo">053</span> private MetricHistogram putHisto;<a name="line.53"></a>
<span class="sourceLineNo">054</span> private MetricHistogram deleteHisto;<a name="line.54"></a>
<span class="sourceLineNo">055</span> private MetricHistogram incrementHisto;<a name="line.55"></a>
<span class="sourceLineNo">056</span> private MetricHistogram appendHisto;<a name="line.56"></a>
<span class="sourceLineNo">057</span> private MetricHistogram replayHisto;<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span> private final int hashCode;<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span> private AtomicBoolean closed = new AtomicBoolean(false);<a name="line.61"></a>
<span class="sourceLineNo">062</span> private final MetricsUserAggregateSourceImpl agg;<a name="line.62"></a>
<span class="sourceLineNo">063</span> private final DynamicMetricsRegistry registry;<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span> private ConcurrentHashMap&lt;String, ClientMetrics&gt; clientMetricsMap;<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> static class ClientMetricsImpl implements ClientMetrics {<a name="line.67"></a>
<span class="sourceLineNo">068</span> private final String hostName;<a name="line.68"></a>
<span class="sourceLineNo">069</span> final LongAdder readRequestsCount = new LongAdder();<a name="line.69"></a>
<span class="sourceLineNo">070</span> final LongAdder writeRequestsCount = new LongAdder();<a name="line.70"></a>
<span class="sourceLineNo">071</span> final LongAdder filteredRequestsCount = new LongAdder();<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span> public ClientMetricsImpl(String hostName) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> this.hostName = hostName;<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> @Override public void incrementReadRequest() {<a name="line.77"></a>
<span class="sourceLineNo">078</span> readRequestsCount.increment();<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span> @Override public void incrementWriteRequest() {<a name="line.81"></a>
<span class="sourceLineNo">082</span> writeRequestsCount.increment();<a name="line.82"></a>
<span class="sourceLineNo">083</span> }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span> @Override public String getHostName() {<a name="line.85"></a>
<span class="sourceLineNo">086</span> return hostName;<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> @Override public long getReadRequestsCount() {<a name="line.89"></a>
<span class="sourceLineNo">090</span> return readRequestsCount.sum();<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> @Override public long getWriteRequestsCount() {<a name="line.93"></a>
<span class="sourceLineNo">094</span> return writeRequestsCount.sum();<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> @Override public void incrementFilteredReadRequests() {<a name="line.97"></a>
<span class="sourceLineNo">098</span> filteredRequestsCount.increment();<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span> }<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span> @Override public long getFilteredReadRequests() {<a name="line.102"></a>
<span class="sourceLineNo">103</span> return filteredRequestsCount.sum();<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<a name="line.104"></a>
<span class="sourceLineNo">105</span> }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span> public MetricsUserSourceImpl(String user, MetricsUserAggregateSourceImpl agg) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> if (LOG.isDebugEnabled()) {<a name="line.108"></a>
<span class="sourceLineNo">109</span> LOG.debug("Creating new MetricsUserSourceImpl for user " + user);<a name="line.109"></a>
<span class="sourceLineNo">110</span> }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span> this.user = user;<a name="line.112"></a>
<span class="sourceLineNo">113</span> this.agg = agg;<a name="line.113"></a>
<span class="sourceLineNo">114</span> this.registry = agg.getMetricsRegistry();<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span> this.userNamePrefix = "user_" + user + "_metric_";<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span> hashCode = userNamePrefix.hashCode();<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span> userGetKey = userNamePrefix + MetricsRegionServerSource.GET_KEY;<a name="line.120"></a>
<span class="sourceLineNo">121</span> userScanTimeKey = userNamePrefix + MetricsRegionServerSource.SCAN_TIME_KEY;<a name="line.121"></a>
<span class="sourceLineNo">122</span> userPutKey = userNamePrefix + MetricsRegionServerSource.PUT_KEY;<a name="line.122"></a>
<span class="sourceLineNo">123</span> userDeleteKey = userNamePrefix + MetricsRegionServerSource.DELETE_KEY;<a name="line.123"></a>
<span class="sourceLineNo">124</span> userIncrementKey = userNamePrefix + MetricsRegionServerSource.INCREMENT_KEY;<a name="line.124"></a>
<span class="sourceLineNo">125</span> userAppendKey = userNamePrefix + MetricsRegionServerSource.APPEND_KEY;<a name="line.125"></a>
<span class="sourceLineNo">126</span> userReplayKey = userNamePrefix + MetricsRegionServerSource.REPLAY_KEY;<a name="line.126"></a>
<span class="sourceLineNo">127</span> clientMetricsMap = new ConcurrentHashMap&lt;&gt;();<a name="line.127"></a>
<span class="sourceLineNo">128</span> agg.register(this);<a name="line.128"></a>
<span class="sourceLineNo">129</span> }<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span> @Override<a name="line.131"></a>
<span class="sourceLineNo">132</span> public void register() {<a name="line.132"></a>
<span class="sourceLineNo">133</span> synchronized (this) {<a name="line.133"></a>
<span class="sourceLineNo">134</span> getHisto = registry.newTimeHistogram(userGetKey);<a name="line.134"></a>
<span class="sourceLineNo">135</span> scanTimeHisto = registry.newTimeHistogram(userScanTimeKey);<a name="line.135"></a>
<span class="sourceLineNo">136</span> putHisto = registry.newTimeHistogram(userPutKey);<a name="line.136"></a>
<span class="sourceLineNo">137</span> deleteHisto = registry.newTimeHistogram(userDeleteKey);<a name="line.137"></a>
<span class="sourceLineNo">138</span> incrementHisto = registry.newTimeHistogram(userIncrementKey);<a name="line.138"></a>
<span class="sourceLineNo">139</span> appendHisto = registry.newTimeHistogram(userAppendKey);<a name="line.139"></a>
<span class="sourceLineNo">140</span> replayHisto = registry.newTimeHistogram(userReplayKey);<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>
<span class="sourceLineNo">144</span> @Override<a name="line.144"></a>
<span class="sourceLineNo">145</span> public void deregister() {<a name="line.145"></a>
<span class="sourceLineNo">146</span> boolean wasClosed = closed.getAndSet(true);<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span> // Has someone else already closed this for us?<a name="line.148"></a>
<span class="sourceLineNo">149</span> if (wasClosed) {<a name="line.149"></a>
<span class="sourceLineNo">150</span> return;<a name="line.150"></a>
<span class="sourceLineNo">151</span> }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span> if (LOG.isDebugEnabled()) {<a name="line.153"></a>
<span class="sourceLineNo">154</span> LOG.debug("Removing user Metrics for user: " + user);<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> synchronized (this) {<a name="line.157"></a>
<span class="sourceLineNo">158</span> registry.removeMetric(userGetKey);<a name="line.158"></a>
<span class="sourceLineNo">159</span> registry.removeMetric(userScanTimeKey);<a name="line.159"></a>
<span class="sourceLineNo">160</span> registry.removeMetric(userPutKey);<a name="line.160"></a>
<span class="sourceLineNo">161</span> registry.removeMetric(userDeleteKey);<a name="line.161"></a>
<span class="sourceLineNo">162</span> registry.removeMetric(userIncrementKey);<a name="line.162"></a>
<span class="sourceLineNo">163</span> registry.removeMetric(userAppendKey);<a name="line.163"></a>
<span class="sourceLineNo">164</span> registry.removeMetric(userReplayKey);<a name="line.164"></a>
<span class="sourceLineNo">165</span> }<a name="line.165"></a>
<span class="sourceLineNo">166</span> }<a name="line.166"></a>
<span class="sourceLineNo">167</span><a name="line.167"></a>
<span class="sourceLineNo">168</span> @Override<a name="line.168"></a>
<span class="sourceLineNo">169</span> public String getUser() {<a name="line.169"></a>
<span class="sourceLineNo">170</span> return user;<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> @Override<a name="line.173"></a>
<span class="sourceLineNo">174</span> public int compareTo(MetricsUserSource source) {<a name="line.174"></a>
<span class="sourceLineNo">175</span> if (source == null) {<a name="line.175"></a>
<span class="sourceLineNo">176</span> return -1;<a name="line.176"></a>
<span class="sourceLineNo">177</span> }<a name="line.177"></a>
<span class="sourceLineNo">178</span> if (!(source instanceof MetricsUserSourceImpl)) {<a name="line.178"></a>
<span class="sourceLineNo">179</span> return -1;<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span> MetricsUserSourceImpl impl = (MetricsUserSourceImpl) source;<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span> return Long.compare(hashCode, impl.hashCode);<a name="line.184"></a>
<span class="sourceLineNo">185</span> }<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span> @Override<a name="line.187"></a>
<span class="sourceLineNo">188</span> public int hashCode() {<a name="line.188"></a>
<span class="sourceLineNo">189</span> return hashCode;<a name="line.189"></a>
<span class="sourceLineNo">190</span> }<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span> @Override<a name="line.192"></a>
<span class="sourceLineNo">193</span> public boolean equals(Object obj) {<a name="line.193"></a>
<span class="sourceLineNo">194</span> return obj == this ||<a name="line.194"></a>
<span class="sourceLineNo">195</span> (obj instanceof MetricsUserSourceImpl &amp;&amp; compareTo((MetricsUserSourceImpl) obj) == 0);<a name="line.195"></a>
<span class="sourceLineNo">196</span> }<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span> void snapshot(MetricsRecordBuilder mrb, boolean ignored) {<a name="line.198"></a>
<span class="sourceLineNo">199</span> // If there is a close that started be double extra sure<a name="line.199"></a>
<span class="sourceLineNo">200</span> // that we're not getting any locks and not putting data<a name="line.200"></a>
<span class="sourceLineNo">201</span> // into the metrics that should be removed. So early out<a name="line.201"></a>
<span class="sourceLineNo">202</span> // before even getting the lock.<a name="line.202"></a>
<span class="sourceLineNo">203</span> if (closed.get()) {<a name="line.203"></a>
<span class="sourceLineNo">204</span> return;<a name="line.204"></a>
<span class="sourceLineNo">205</span> }<a name="line.205"></a>
<span class="sourceLineNo">206</span><a name="line.206"></a>
<span class="sourceLineNo">207</span> // Grab the read<a name="line.207"></a>
<span class="sourceLineNo">208</span> // This ensures that removes of the metrics<a name="line.208"></a>
<span class="sourceLineNo">209</span> // can't happen while we are putting them back in.<a name="line.209"></a>
<span class="sourceLineNo">210</span> synchronized (this) {<a name="line.210"></a>
<span class="sourceLineNo">211</span><a name="line.211"></a>
<span class="sourceLineNo">212</span> // It's possible that a close happened between checking<a name="line.212"></a>
<span class="sourceLineNo">213</span> // the closed variable and getting the lock.<a name="line.213"></a>
<span class="sourceLineNo">214</span> if (closed.get()) {<a name="line.214"></a>
<span class="sourceLineNo">215</span> return;<a name="line.215"></a>
<span class="sourceLineNo">216</span> }<a name="line.216"></a>
<span class="sourceLineNo">217</span> }<a name="line.217"></a>
<span class="sourceLineNo">218</span> }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span> @Override<a name="line.220"></a>
<span class="sourceLineNo">221</span> public void updatePut(long t) {<a name="line.221"></a>
<span class="sourceLineNo">222</span> putHisto.add(t);<a name="line.222"></a>
<span class="sourceLineNo">223</span> }<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span> @Override<a name="line.225"></a>
<span class="sourceLineNo">226</span> public void updateDelete(long t) {<a name="line.226"></a>
<span class="sourceLineNo">227</span> deleteHisto.add(t);<a name="line.227"></a>
<span class="sourceLineNo">228</span> }<a name="line.228"></a>
<span class="sourceLineNo">229</span><a name="line.229"></a>
<span class="sourceLineNo">230</span> @Override<a name="line.230"></a>
<span class="sourceLineNo">231</span> public void updateGet(long t) {<a name="line.231"></a>
<span class="sourceLineNo">232</span> getHisto.add(t);<a name="line.232"></a>
<span class="sourceLineNo">233</span> }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span> @Override<a name="line.235"></a>
<span class="sourceLineNo">236</span> public void updateIncrement(long t) {<a name="line.236"></a>
<span class="sourceLineNo">237</span> incrementHisto.add(t);<a name="line.237"></a>
<span class="sourceLineNo">238</span> }<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span> @Override<a name="line.240"></a>
<span class="sourceLineNo">241</span> public void updateAppend(long t) {<a name="line.241"></a>
<span class="sourceLineNo">242</span> appendHisto.add(t);<a name="line.242"></a>
<span class="sourceLineNo">243</span> }<a name="line.243"></a>
<span class="sourceLineNo">244</span><a name="line.244"></a>
<span class="sourceLineNo">245</span> @Override<a name="line.245"></a>
<span class="sourceLineNo">246</span> public void updateReplay(long t) {<a name="line.246"></a>
<span class="sourceLineNo">247</span> replayHisto.add(t);<a name="line.247"></a>
<span class="sourceLineNo">248</span> }<a name="line.248"></a>
<span class="sourceLineNo">249</span><a name="line.249"></a>
<span class="sourceLineNo">250</span> @Override<a name="line.250"></a>
<span class="sourceLineNo">251</span> public void updateScanTime(long t) {<a name="line.251"></a>
<span class="sourceLineNo">252</span> scanTimeHisto.add(t);<a name="line.252"></a>
<span class="sourceLineNo">253</span> }<a name="line.253"></a>
<span class="sourceLineNo">254</span><a name="line.254"></a>
<span class="sourceLineNo">255</span> @Override public void getMetrics(MetricsCollector metricsCollector, boolean all) {<a name="line.255"></a>
<span class="sourceLineNo">256</span> MetricsRecordBuilder mrb = metricsCollector.addRecord(this.userNamePrefix);<a name="line.256"></a>
<span class="sourceLineNo">257</span> registry.snapshot(mrb, all);<a name="line.257"></a>
<span class="sourceLineNo">258</span> }<a name="line.258"></a>
<span class="sourceLineNo">259</span><a name="line.259"></a>
<span class="sourceLineNo">260</span> @Override public Map&lt;String, ClientMetrics&gt; getClientMetrics() {<a name="line.260"></a>
<span class="sourceLineNo">261</span> return Collections.unmodifiableMap(clientMetricsMap);<a name="line.261"></a>
<span class="sourceLineNo">262</span> }<a name="line.262"></a>
<span class="sourceLineNo">263</span><a name="line.263"></a>
<span class="sourceLineNo">264</span> @Override public ClientMetrics getOrCreateMetricsClient(String client) {<a name="line.264"></a>
<span class="sourceLineNo">265</span> ClientMetrics source = clientMetricsMap.get(client);<a name="line.265"></a>
<span class="sourceLineNo">266</span> if (source != null) {<a name="line.266"></a>
<span class="sourceLineNo">267</span> return source;<a name="line.267"></a>
<span class="sourceLineNo">268</span> }<a name="line.268"></a>
<span class="sourceLineNo">269</span> source = new ClientMetricsImpl(client);<a name="line.269"></a>
<span class="sourceLineNo">270</span> ClientMetrics prev = clientMetricsMap.putIfAbsent(client, source);<a name="line.270"></a>
<span class="sourceLineNo">271</span> if (prev != null) {<a name="line.271"></a>
<span class="sourceLineNo">272</span> return prev;<a name="line.272"></a>
<span class="sourceLineNo">273</span> }<a name="line.273"></a>
<span class="sourceLineNo">274</span> return source;<a name="line.274"></a>
<span class="sourceLineNo">275</span> }<a name="line.275"></a>
<span class="sourceLineNo">276</span><a name="line.276"></a>
<span class="sourceLineNo">277</span>}<a name="line.277"></a>
</pre>
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