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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>package org.apache.hadoop.hbase.ipc;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.nio.ByteBuffer;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.nio.channels.CancelledKeyException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.nio.channels.ClosedChannelException;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.nio.channels.SelectionKey;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.nio.channels.Selector;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.ArrayList;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.Collections;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Iterator;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Set;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.HBaseIOException;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.security.HBaseSaslRpcServer;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.hadoop.util.StringUtils;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>/**<a name="line.39"></a>
<span class="sourceLineNo">040</span> * Sends responses of RPC back to clients.<a name="line.40"></a>
<span class="sourceLineNo">041</span> */<a name="line.41"></a>
<span class="sourceLineNo">042</span>@Deprecated<a name="line.42"></a>
<span class="sourceLineNo">043</span>@InterfaceAudience.Private<a name="line.43"></a>
<span class="sourceLineNo">044</span>class SimpleRpcServerResponder extends Thread {<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span> private final SimpleRpcServer simpleRpcServer;<a name="line.46"></a>
<span class="sourceLineNo">047</span> private final Selector writeSelector;<a name="line.47"></a>
<span class="sourceLineNo">048</span> private final Set&lt;SimpleServerRpcConnection&gt; writingCons =<a name="line.48"></a>
<span class="sourceLineNo">049</span> Collections.newSetFromMap(new ConcurrentHashMap&lt;&gt;());<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> SimpleRpcServerResponder(SimpleRpcServer simpleRpcServer) throws IOException {<a name="line.51"></a>
<span class="sourceLineNo">052</span> this.simpleRpcServer = simpleRpcServer;<a name="line.52"></a>
<span class="sourceLineNo">053</span> this.setName("RpcServer.responder");<a name="line.53"></a>
<span class="sourceLineNo">054</span> this.setDaemon(true);<a name="line.54"></a>
<span class="sourceLineNo">055</span> this.setUncaughtExceptionHandler(Threads.LOGGING_EXCEPTION_HANDLER);<a name="line.55"></a>
<span class="sourceLineNo">056</span> writeSelector = Selector.open(); // create a selector<a name="line.56"></a>
<span class="sourceLineNo">057</span> }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span> @Override<a name="line.59"></a>
<span class="sourceLineNo">060</span> public void run() {<a name="line.60"></a>
<span class="sourceLineNo">061</span> SimpleRpcServer.LOG.debug(getName() + ": starting");<a name="line.61"></a>
<span class="sourceLineNo">062</span> try {<a name="line.62"></a>
<span class="sourceLineNo">063</span> doRunLoop();<a name="line.63"></a>
<span class="sourceLineNo">064</span> } finally {<a name="line.64"></a>
<span class="sourceLineNo">065</span> SimpleRpcServer.LOG.info(getName() + ": stopping");<a name="line.65"></a>
<span class="sourceLineNo">066</span> try {<a name="line.66"></a>
<span class="sourceLineNo">067</span> writeSelector.close();<a name="line.67"></a>
<span class="sourceLineNo">068</span> } catch (IOException ioe) {<a name="line.68"></a>
<span class="sourceLineNo">069</span> SimpleRpcServer.LOG.error(getName() + ": couldn't close write selector", ioe);<a name="line.69"></a>
<span class="sourceLineNo">070</span> }<a name="line.70"></a>
<span class="sourceLineNo">071</span> }<a name="line.71"></a>
<span class="sourceLineNo">072</span> }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span> /**<a name="line.74"></a>
<span class="sourceLineNo">075</span> * Take the list of the connections that want to write, and register them in the selector.<a name="line.75"></a>
<span class="sourceLineNo">076</span> */<a name="line.76"></a>
<span class="sourceLineNo">077</span> private void registerWrites() {<a name="line.77"></a>
<span class="sourceLineNo">078</span> Iterator&lt;SimpleServerRpcConnection&gt; it = writingCons.iterator();<a name="line.78"></a>
<span class="sourceLineNo">079</span> while (it.hasNext()) {<a name="line.79"></a>
<span class="sourceLineNo">080</span> SimpleServerRpcConnection c = it.next();<a name="line.80"></a>
<span class="sourceLineNo">081</span> it.remove();<a name="line.81"></a>
<span class="sourceLineNo">082</span> SelectionKey sk = c.channel.keyFor(writeSelector);<a name="line.82"></a>
<span class="sourceLineNo">083</span> try {<a name="line.83"></a>
<span class="sourceLineNo">084</span> if (sk == null) {<a name="line.84"></a>
<span class="sourceLineNo">085</span> try {<a name="line.85"></a>
<span class="sourceLineNo">086</span> c.channel.register(writeSelector, SelectionKey.OP_WRITE, c);<a name="line.86"></a>
<span class="sourceLineNo">087</span> } catch (ClosedChannelException e) {<a name="line.87"></a>
<span class="sourceLineNo">088</span> // ignore: the client went away.<a name="line.88"></a>
<span class="sourceLineNo">089</span> if (SimpleRpcServer.LOG.isTraceEnabled()) SimpleRpcServer.LOG.trace("ignored", e);<a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span> } else {<a name="line.91"></a>
<span class="sourceLineNo">092</span> sk.interestOps(SelectionKey.OP_WRITE);<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span> } catch (CancelledKeyException e) {<a name="line.94"></a>
<span class="sourceLineNo">095</span> // ignore: the client went away.<a name="line.95"></a>
<span class="sourceLineNo">096</span> if (SimpleRpcServer.LOG.isTraceEnabled()) SimpleRpcServer.LOG.trace("ignored", e);<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> }<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> * Add a connection to the list that want to write,<a name="line.102"></a>
<span class="sourceLineNo">103</span> */<a name="line.103"></a>
<span class="sourceLineNo">104</span> public void registerForWrite(SimpleServerRpcConnection c) {<a name="line.104"></a>
<span class="sourceLineNo">105</span> if (writingCons.add(c)) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> writeSelector.wakeup();<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> private void doRunLoop() {<a name="line.110"></a>
<span class="sourceLineNo">111</span> long lastPurgeTime = 0; // last check for old calls.<a name="line.111"></a>
<span class="sourceLineNo">112</span> while (this.simpleRpcServer.running) {<a name="line.112"></a>
<span class="sourceLineNo">113</span> try {<a name="line.113"></a>
<span class="sourceLineNo">114</span> registerWrites();<a name="line.114"></a>
<span class="sourceLineNo">115</span> int keyCt = writeSelector.select(this.simpleRpcServer.purgeTimeout);<a name="line.115"></a>
<span class="sourceLineNo">116</span> if (keyCt == 0) {<a name="line.116"></a>
<span class="sourceLineNo">117</span> continue;<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span> Set&lt;SelectionKey&gt; keys = writeSelector.selectedKeys();<a name="line.120"></a>
<span class="sourceLineNo">121</span> Iterator&lt;SelectionKey&gt; iter = keys.iterator();<a name="line.121"></a>
<span class="sourceLineNo">122</span> while (iter.hasNext()) {<a name="line.122"></a>
<span class="sourceLineNo">123</span> SelectionKey key = iter.next();<a name="line.123"></a>
<span class="sourceLineNo">124</span> iter.remove();<a name="line.124"></a>
<span class="sourceLineNo">125</span> try {<a name="line.125"></a>
<span class="sourceLineNo">126</span> if (key.isValid() &amp;&amp; key.isWritable()) {<a name="line.126"></a>
<span class="sourceLineNo">127</span> doAsyncWrite(key);<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span> } catch (IOException e) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> SimpleRpcServer.LOG.debug(getName() + ": asyncWrite", e);<a name="line.130"></a>
<span class="sourceLineNo">131</span> }<a name="line.131"></a>
<span class="sourceLineNo">132</span> }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span> lastPurgeTime = purge(lastPurgeTime);<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span> } catch (OutOfMemoryError e) {<a name="line.136"></a>
<span class="sourceLineNo">137</span> if (this.simpleRpcServer.errorHandler != null) {<a name="line.137"></a>
<span class="sourceLineNo">138</span> if (this.simpleRpcServer.errorHandler.checkOOME(e)) {<a name="line.138"></a>
<span class="sourceLineNo">139</span> SimpleRpcServer.LOG.info(getName() + ": exiting on OutOfMemoryError");<a name="line.139"></a>
<span class="sourceLineNo">140</span> return;<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span> } else {<a name="line.142"></a>
<span class="sourceLineNo">143</span> //<a name="line.143"></a>
<span class="sourceLineNo">144</span> // we can run out of memory if we have too many threads<a name="line.144"></a>
<span class="sourceLineNo">145</span> // log the event and sleep for a minute and give<a name="line.145"></a>
<span class="sourceLineNo">146</span> // some thread(s) a chance to finish<a name="line.146"></a>
<span class="sourceLineNo">147</span> //<a name="line.147"></a>
<span class="sourceLineNo">148</span> SimpleRpcServer.LOG.warn(getName() + ": OutOfMemoryError in server select", e);<a name="line.148"></a>
<span class="sourceLineNo">149</span> try {<a name="line.149"></a>
<span class="sourceLineNo">150</span> Thread.sleep(60000);<a name="line.150"></a>
<span class="sourceLineNo">151</span> } catch (InterruptedException ex) {<a name="line.151"></a>
<span class="sourceLineNo">152</span> SimpleRpcServer.LOG.debug("Interrupted while sleeping");<a name="line.152"></a>
<span class="sourceLineNo">153</span> return;<a name="line.153"></a>
<span class="sourceLineNo">154</span> }<a name="line.154"></a>
<span class="sourceLineNo">155</span> }<a name="line.155"></a>
<span class="sourceLineNo">156</span> } catch (Exception e) {<a name="line.156"></a>
<span class="sourceLineNo">157</span> SimpleRpcServer.LOG<a name="line.157"></a>
<span class="sourceLineNo">158</span> .warn(getName() + ": exception in Responder " + StringUtils.stringifyException(e), e);<a name="line.158"></a>
<span class="sourceLineNo">159</span> }<a name="line.159"></a>
<span class="sourceLineNo">160</span> }<a name="line.160"></a>
<span class="sourceLineNo">161</span> SimpleRpcServer.LOG.info(getName() + ": stopped");<a name="line.161"></a>
<span class="sourceLineNo">162</span> }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span> /**<a name="line.164"></a>
<span class="sourceLineNo">165</span> * If there were some calls that have not been sent out for a long time, we close the connection.<a name="line.165"></a>
<span class="sourceLineNo">166</span> * @return the time of the purge.<a name="line.166"></a>
<span class="sourceLineNo">167</span> */<a name="line.167"></a>
<span class="sourceLineNo">168</span> private long purge(long lastPurgeTime) {<a name="line.168"></a>
<span class="sourceLineNo">169</span> long now = EnvironmentEdgeManager.currentTime();<a name="line.169"></a>
<span class="sourceLineNo">170</span> if (now &lt; lastPurgeTime + this.simpleRpcServer.purgeTimeout) {<a name="line.170"></a>
<span class="sourceLineNo">171</span> return lastPurgeTime;<a name="line.171"></a>
<span class="sourceLineNo">172</span> }<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span> ArrayList&lt;SimpleServerRpcConnection&gt; conWithOldCalls = new ArrayList&lt;&gt;();<a name="line.174"></a>
<span class="sourceLineNo">175</span> // get the list of channels from list of keys.<a name="line.175"></a>
<span class="sourceLineNo">176</span> synchronized (writeSelector.keys()) {<a name="line.176"></a>
<span class="sourceLineNo">177</span> for (SelectionKey key : writeSelector.keys()) {<a name="line.177"></a>
<span class="sourceLineNo">178</span> SimpleServerRpcConnection connection = (SimpleServerRpcConnection) key.attachment();<a name="line.178"></a>
<span class="sourceLineNo">179</span> if (connection == null) {<a name="line.179"></a>
<span class="sourceLineNo">180</span> throw new IllegalStateException("Coding error: SelectionKey key without attachment.");<a name="line.180"></a>
<span class="sourceLineNo">181</span> }<a name="line.181"></a>
<span class="sourceLineNo">182</span> if (<a name="line.182"></a>
<span class="sourceLineNo">183</span> connection.lastSentTime &gt; 0<a name="line.183"></a>
<span class="sourceLineNo">184</span> &amp;&amp; now &gt; connection.lastSentTime + this.simpleRpcServer.purgeTimeout<a name="line.184"></a>
<span class="sourceLineNo">185</span> ) {<a name="line.185"></a>
<span class="sourceLineNo">186</span> conWithOldCalls.add(connection);<a name="line.186"></a>
<span class="sourceLineNo">187</span> }<a name="line.187"></a>
<span class="sourceLineNo">188</span> }<a name="line.188"></a>
<span class="sourceLineNo">189</span> }<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span> // Seems safer to close the connection outside of the synchronized loop...<a name="line.191"></a>
<span class="sourceLineNo">192</span> for (SimpleServerRpcConnection connection : conWithOldCalls) {<a name="line.192"></a>
<span class="sourceLineNo">193</span> this.simpleRpcServer.closeConnection(connection);<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>
<span class="sourceLineNo">196</span> return now;<a name="line.196"></a>
<span class="sourceLineNo">197</span> }<a name="line.197"></a>
<span class="sourceLineNo">198</span><a name="line.198"></a>
<span class="sourceLineNo">199</span> private void doAsyncWrite(SelectionKey key) throws IOException {<a name="line.199"></a>
<span class="sourceLineNo">200</span> SimpleServerRpcConnection connection = (SimpleServerRpcConnection) key.attachment();<a name="line.200"></a>
<span class="sourceLineNo">201</span> if (connection == null) {<a name="line.201"></a>
<span class="sourceLineNo">202</span> throw new IOException("doAsyncWrite: no connection");<a name="line.202"></a>
<span class="sourceLineNo">203</span> }<a name="line.203"></a>
<span class="sourceLineNo">204</span> if (key.channel() != connection.channel) {<a name="line.204"></a>
<span class="sourceLineNo">205</span> throw new IOException("doAsyncWrite: bad channel");<a name="line.205"></a>
<span class="sourceLineNo">206</span> }<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span> if (processAllResponses(connection)) {<a name="line.208"></a>
<span class="sourceLineNo">209</span> try {<a name="line.209"></a>
<span class="sourceLineNo">210</span> // We wrote everything, so we don't need to be told when the socket is ready for<a name="line.210"></a>
<span class="sourceLineNo">211</span> // write anymore.<a name="line.211"></a>
<span class="sourceLineNo">212</span> key.interestOps(0);<a name="line.212"></a>
<span class="sourceLineNo">213</span> } catch (CancelledKeyException e) {<a name="line.213"></a>
<span class="sourceLineNo">214</span> /*<a name="line.214"></a>
<span class="sourceLineNo">215</span> * The Listener/reader might have closed the socket. We don't explicitly cancel the key, so<a name="line.215"></a>
<span class="sourceLineNo">216</span> * not sure if this will ever fire. This warning could be removed.<a name="line.216"></a>
<span class="sourceLineNo">217</span> */<a name="line.217"></a>
<span class="sourceLineNo">218</span> SimpleRpcServer.LOG.warn("Exception while changing ops : " + e);<a name="line.218"></a>
<span class="sourceLineNo">219</span> }<a name="line.219"></a>
<span class="sourceLineNo">220</span> }<a name="line.220"></a>
<span class="sourceLineNo">221</span> }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span> private BufferChain wrapWithSasl(HBaseSaslRpcServer saslServer, BufferChain bc)<a name="line.223"></a>
<span class="sourceLineNo">224</span> throws IOException {<a name="line.224"></a>
<span class="sourceLineNo">225</span> // Looks like no way around this; saslserver wants a byte array. I have to make it one.<a name="line.225"></a>
<span class="sourceLineNo">226</span> // THIS IS A BIG UGLY COPY.<a name="line.226"></a>
<span class="sourceLineNo">227</span> byte[] responseBytes = bc.getBytes();<a name="line.227"></a>
<span class="sourceLineNo">228</span> byte[] token;<a name="line.228"></a>
<span class="sourceLineNo">229</span> // synchronization may be needed since there can be multiple Handler<a name="line.229"></a>
<span class="sourceLineNo">230</span> // threads using saslServer or Crypto AES to wrap responses.<a name="line.230"></a>
<span class="sourceLineNo">231</span> synchronized (saslServer) {<a name="line.231"></a>
<span class="sourceLineNo">232</span> token = saslServer.wrap(responseBytes, 0, responseBytes.length);<a name="line.232"></a>
<span class="sourceLineNo">233</span> }<a name="line.233"></a>
<span class="sourceLineNo">234</span> if (SimpleRpcServer.LOG.isTraceEnabled()) {<a name="line.234"></a>
<span class="sourceLineNo">235</span> SimpleRpcServer.LOG<a name="line.235"></a>
<span class="sourceLineNo">236</span> .trace("Adding saslServer wrapped token of size " + token.length + " as call response.");<a name="line.236"></a>
<span class="sourceLineNo">237</span> }<a name="line.237"></a>
<span class="sourceLineNo">238</span><a name="line.238"></a>
<span class="sourceLineNo">239</span> ByteBuffer[] responseBufs = new ByteBuffer[2];<a name="line.239"></a>
<span class="sourceLineNo">240</span> responseBufs[0] = ByteBuffer.wrap(Bytes.toBytes(token.length));<a name="line.240"></a>
<span class="sourceLineNo">241</span> responseBufs[1] = ByteBuffer.wrap(token);<a name="line.241"></a>
<span class="sourceLineNo">242</span> return new BufferChain(responseBufs);<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> /**<a name="line.245"></a>
<span class="sourceLineNo">246</span> * Process the response for this call. You need to have the lock on<a name="line.246"></a>
<span class="sourceLineNo">247</span> * {@link org.apache.hadoop.hbase.ipc.SimpleServerRpcConnection#responseWriteLock}<a name="line.247"></a>
<span class="sourceLineNo">248</span> * @return true if we proceed the call fully, false otherwise.<a name="line.248"></a>
<span class="sourceLineNo">249</span> */<a name="line.249"></a>
<span class="sourceLineNo">250</span> private boolean processResponse(SimpleServerRpcConnection conn, RpcResponse resp)<a name="line.250"></a>
<span class="sourceLineNo">251</span> throws IOException {<a name="line.251"></a>
<span class="sourceLineNo">252</span> boolean error = true;<a name="line.252"></a>
<span class="sourceLineNo">253</span> BufferChain buf = resp.getResponse();<a name="line.253"></a>
<span class="sourceLineNo">254</span> if (conn.useWrap) {<a name="line.254"></a>
<span class="sourceLineNo">255</span> buf = wrapWithSasl(conn.saslServer, buf);<a name="line.255"></a>
<span class="sourceLineNo">256</span> }<a name="line.256"></a>
<span class="sourceLineNo">257</span> try {<a name="line.257"></a>
<span class="sourceLineNo">258</span> // Send as much data as we can in the non-blocking fashion<a name="line.258"></a>
<span class="sourceLineNo">259</span> long numBytes = this.simpleRpcServer.channelWrite(conn.channel, buf);<a name="line.259"></a>
<span class="sourceLineNo">260</span> if (numBytes &lt; 0) {<a name="line.260"></a>
<span class="sourceLineNo">261</span> throw new HBaseIOException("Error writing on the socket " + conn);<a name="line.261"></a>
<span class="sourceLineNo">262</span> }<a name="line.262"></a>
<span class="sourceLineNo">263</span> error = false;<a name="line.263"></a>
<span class="sourceLineNo">264</span> } finally {<a name="line.264"></a>
<span class="sourceLineNo">265</span> if (error) {<a name="line.265"></a>
<span class="sourceLineNo">266</span> SimpleRpcServer.LOG.debug(conn + ": output error -- closing");<a name="line.266"></a>
<span class="sourceLineNo">267</span> // We will be closing this connection itself. Mark this call as done so that all the<a name="line.267"></a>
<span class="sourceLineNo">268</span> // buffer(s) it got from pool can get released<a name="line.268"></a>
<span class="sourceLineNo">269</span> resp.done();<a name="line.269"></a>
<span class="sourceLineNo">270</span> this.simpleRpcServer.closeConnection(conn);<a name="line.270"></a>
<span class="sourceLineNo">271</span> }<a name="line.271"></a>
<span class="sourceLineNo">272</span> }<a name="line.272"></a>
<span class="sourceLineNo">273</span><a name="line.273"></a>
<span class="sourceLineNo">274</span> if (!buf.hasRemaining()) {<a name="line.274"></a>
<span class="sourceLineNo">275</span> resp.done();<a name="line.275"></a>
<span class="sourceLineNo">276</span> return true;<a name="line.276"></a>
<span class="sourceLineNo">277</span> } else {<a name="line.277"></a>
<span class="sourceLineNo">278</span> // set the serve time when the response has to be sent later<a name="line.278"></a>
<span class="sourceLineNo">279</span> conn.lastSentTime = EnvironmentEdgeManager.currentTime();<a name="line.279"></a>
<span class="sourceLineNo">280</span> return false; // Socket can't take more, we will have to come back.<a name="line.280"></a>
<span class="sourceLineNo">281</span> }<a name="line.281"></a>
<span class="sourceLineNo">282</span> }<a name="line.282"></a>
<span class="sourceLineNo">283</span><a name="line.283"></a>
<span class="sourceLineNo">284</span> /**<a name="line.284"></a>
<span class="sourceLineNo">285</span> * Process all the responses for this connection<a name="line.285"></a>
<span class="sourceLineNo">286</span> * @return true if all the calls were processed or that someone else is doing it. false if there<a name="line.286"></a>
<span class="sourceLineNo">287</span> * is still some work to do. In this case, we expect the caller to delay us.<a name="line.287"></a>
<span class="sourceLineNo">288</span> */<a name="line.288"></a>
<span class="sourceLineNo">289</span> private boolean processAllResponses(final SimpleServerRpcConnection connection)<a name="line.289"></a>
<span class="sourceLineNo">290</span> throws IOException {<a name="line.290"></a>
<span class="sourceLineNo">291</span> // We want only one writer on the channel for a connection at a time.<a name="line.291"></a>
<span class="sourceLineNo">292</span> connection.responseWriteLock.lock();<a name="line.292"></a>
<span class="sourceLineNo">293</span> try {<a name="line.293"></a>
<span class="sourceLineNo">294</span> for (int i = 0; i &lt; 20; i++) {<a name="line.294"></a>
<span class="sourceLineNo">295</span> // protection if some handlers manage to need all the responder<a name="line.295"></a>
<span class="sourceLineNo">296</span> RpcResponse resp = connection.responseQueue.pollFirst();<a name="line.296"></a>
<span class="sourceLineNo">297</span> if (resp == null) {<a name="line.297"></a>
<span class="sourceLineNo">298</span> return true;<a name="line.298"></a>
<span class="sourceLineNo">299</span> }<a name="line.299"></a>
<span class="sourceLineNo">300</span> if (!processResponse(connection, resp)) {<a name="line.300"></a>
<span class="sourceLineNo">301</span> connection.responseQueue.addFirst(resp);<a name="line.301"></a>
<span class="sourceLineNo">302</span> return false;<a name="line.302"></a>
<span class="sourceLineNo">303</span> }<a name="line.303"></a>
<span class="sourceLineNo">304</span> }<a name="line.304"></a>
<span class="sourceLineNo">305</span> } finally {<a name="line.305"></a>
<span class="sourceLineNo">306</span> connection.responseWriteLock.unlock();<a name="line.306"></a>
<span class="sourceLineNo">307</span> }<a name="line.307"></a>
<span class="sourceLineNo">308</span><a name="line.308"></a>
<span class="sourceLineNo">309</span> return connection.responseQueue.isEmpty();<a name="line.309"></a>
<span class="sourceLineNo">310</span> }<a name="line.310"></a>
<span class="sourceLineNo">311</span><a name="line.311"></a>
<span class="sourceLineNo">312</span> //<a name="line.312"></a>
<span class="sourceLineNo">313</span> // Enqueue a response from the application.<a name="line.313"></a>
<span class="sourceLineNo">314</span> //<a name="line.314"></a>
<span class="sourceLineNo">315</span> void doRespond(SimpleServerRpcConnection conn, RpcResponse resp) throws IOException {<a name="line.315"></a>
<span class="sourceLineNo">316</span> boolean added = false;<a name="line.316"></a>
<span class="sourceLineNo">317</span> // If there is already a write in progress, we don't wait. This allows to free the handlers<a name="line.317"></a>
<span class="sourceLineNo">318</span> // immediately for other tasks.<a name="line.318"></a>
<span class="sourceLineNo">319</span> if (conn.responseQueue.isEmpty() &amp;&amp; conn.responseWriteLock.tryLock()) {<a name="line.319"></a>
<span class="sourceLineNo">320</span> try {<a name="line.320"></a>
<span class="sourceLineNo">321</span> if (conn.responseQueue.isEmpty()) {<a name="line.321"></a>
<span class="sourceLineNo">322</span> // If we're alone, we can try to do a direct call to the socket. It's<a name="line.322"></a>
<span class="sourceLineNo">323</span> // an optimization to save on context switches and data transfer between cores..<a name="line.323"></a>
<span class="sourceLineNo">324</span> if (processResponse(conn, resp)) {<a name="line.324"></a>
<span class="sourceLineNo">325</span> return; // we're done.<a name="line.325"></a>
<span class="sourceLineNo">326</span> }<a name="line.326"></a>
<span class="sourceLineNo">327</span> // Too big to fit, putting ahead.<a name="line.327"></a>
<span class="sourceLineNo">328</span> conn.responseQueue.addFirst(resp);<a name="line.328"></a>
<span class="sourceLineNo">329</span> added = true; // We will register to the selector later, outside of the lock.<a name="line.329"></a>
<span class="sourceLineNo">330</span> }<a name="line.330"></a>
<span class="sourceLineNo">331</span> } finally {<a name="line.331"></a>
<span class="sourceLineNo">332</span> conn.responseWriteLock.unlock();<a name="line.332"></a>
<span class="sourceLineNo">333</span> }<a name="line.333"></a>
<span class="sourceLineNo">334</span> }<a name="line.334"></a>
<span class="sourceLineNo">335</span><a name="line.335"></a>
<span class="sourceLineNo">336</span> if (!added) {<a name="line.336"></a>
<span class="sourceLineNo">337</span> conn.responseQueue.addLast(resp);<a name="line.337"></a>
<span class="sourceLineNo">338</span> }<a name="line.338"></a>
<span class="sourceLineNo">339</span> registerForWrite(conn);<a name="line.339"></a>
<span class="sourceLineNo">340</span> }<a name="line.340"></a>
<span class="sourceLineNo">341</span>}<a name="line.341"></a>
</pre>
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