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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.util.Deque;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.concurrent.BlockingQueue;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.concurrent.Semaphore;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.Abortable;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span><a name="line.26"></a> |
| <span class="sourceLineNo">027</span>@InterfaceAudience.Private<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>public class FastPathRpcHandler extends RpcHandler {<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> // Below are for fast-path support. Push this Handler on to the fastPathHandlerStack Deque<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> // if an empty queue of CallRunners so we are available for direct handoff when one comes in.<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> final Deque<FastPathRpcHandler> fastPathHandlerStack;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> // Semaphore to coordinate loading of fastpathed loadedTask and our running it.<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> // UNFAIR synchronization.<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> private Semaphore semaphore = new Semaphore(0);<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> // The task we get when fast-pathing.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> private CallRunner loadedCallRunner;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span><a name="line.37"></a> |
| <span class="sourceLineNo">038</span> FastPathRpcHandler(String name, double handlerFailureThreshhold, int handlerCount,<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> BlockingQueue<CallRunner> q, AtomicInteger activeHandlerCount, AtomicInteger failedHandlerCount,<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> final Abortable abortable, final Deque<FastPathRpcHandler> fastPathHandlerStack) {<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> super(name, handlerFailureThreshhold, handlerCount, q, activeHandlerCount, failedHandlerCount,<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> abortable);<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> this.fastPathHandlerStack = fastPathHandlerStack;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> }<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> @Override<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> protected CallRunner getCallRunner() throws InterruptedException {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> // Get a callrunner if one in the Q.<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> CallRunner cr = this.q.poll();<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> if (cr == null) {<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> // Else, if a fastPathHandlerStack present and no callrunner in Q, register ourselves for<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> // the fastpath handoff done via fastPathHandlerStack.<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> if (this.fastPathHandlerStack != null) {<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> this.fastPathHandlerStack.push(this);<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> this.semaphore.acquire();<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> cr = this.loadedCallRunner;<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> this.loadedCallRunner = null;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> } else {<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> // No fastpath available. Block until a task comes available.<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> cr = super.getCallRunner();<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> }<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> }<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> return cr;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> /**<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * @param cr Task gotten via fastpath.<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * @return True if we successfully loaded our task<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> */<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> boolean loadCallRunner(final CallRunner cr) {<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> this.loadedCallRunner = cr;<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> this.semaphore.release();<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> return true;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span>}<a name="line.75"></a> |
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