| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) --> |
| <title>Source code</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta name="description" content="source: package: org.apache.hadoop.hbase.ipc, class: BufferChain"> |
| <meta name="generator" content="javadoc/SourceToHTMLConverter"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> |
| </head> |
| <body class="source-page"> |
| <main role="main"> |
| <div class="source-container"> |
| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.ipc;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.io.IOException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.nio.ByteBuffer;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.nio.channels.GatheringByteChannel;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">024</span><span id="line-24"></span> |
| <span class="source-line-no">025</span><span id="line-25">/**</span> |
| <span class="source-line-no">026</span><span id="line-26"> * Chain of ByteBuffers. Used writing out an array of byte buffers.</span> |
| <span class="source-line-no">027</span><span id="line-27"> */</span> |
| <span class="source-line-no">028</span><span id="line-28">@InterfaceAudience.Private</span> |
| <span class="source-line-no">029</span><span id="line-29">class BufferChain {</span> |
| <span class="source-line-no">030</span><span id="line-30"> private final ByteBuffer[] buffers;</span> |
| <span class="source-line-no">031</span><span id="line-31"> private int remaining = 0;</span> |
| <span class="source-line-no">032</span><span id="line-32"> private int size;</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34"> BufferChain(ByteBuffer... buffers) {</span> |
| <span class="source-line-no">035</span><span id="line-35"> for (ByteBuffer b : buffers) {</span> |
| <span class="source-line-no">036</span><span id="line-36"> this.remaining += b.remaining();</span> |
| <span class="source-line-no">037</span><span id="line-37"> }</span> |
| <span class="source-line-no">038</span><span id="line-38"> this.size = remaining;</span> |
| <span class="source-line-no">039</span><span id="line-39"> this.buffers = buffers;</span> |
| <span class="source-line-no">040</span><span id="line-40"> }</span> |
| <span class="source-line-no">041</span><span id="line-41"></span> |
| <span class="source-line-no">042</span><span id="line-42"> /**</span> |
| <span class="source-line-no">043</span><span id="line-43"> * Expensive. Makes a new buffer to hold a copy of what is in contained ByteBuffers. This call</span> |
| <span class="source-line-no">044</span><span id="line-44"> * drains this instance; it cannot be used subsequent to the call.</span> |
| <span class="source-line-no">045</span><span id="line-45"> * @return A new byte buffer with the content of all contained ByteBuffers.</span> |
| <span class="source-line-no">046</span><span id="line-46"> */</span> |
| <span class="source-line-no">047</span><span id="line-47"> byte[] getBytes() {</span> |
| <span class="source-line-no">048</span><span id="line-48"> if (!hasRemaining()) throw new IllegalAccessError();</span> |
| <span class="source-line-no">049</span><span id="line-49"> byte[] bytes = new byte[this.remaining];</span> |
| <span class="source-line-no">050</span><span id="line-50"> int offset = 0;</span> |
| <span class="source-line-no">051</span><span id="line-51"> for (ByteBuffer bb : this.buffers) {</span> |
| <span class="source-line-no">052</span><span id="line-52"> int length = bb.remaining();</span> |
| <span class="source-line-no">053</span><span id="line-53"> bb.get(bytes, offset, length);</span> |
| <span class="source-line-no">054</span><span id="line-54"> offset += length;</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"> return bytes;</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> boolean hasRemaining() {</span> |
| <span class="source-line-no">060</span><span id="line-60"> return remaining > 0;</span> |
| <span class="source-line-no">061</span><span id="line-61"> }</span> |
| <span class="source-line-no">062</span><span id="line-62"></span> |
| <span class="source-line-no">063</span><span id="line-63"> long write(GatheringByteChannel channel) throws IOException {</span> |
| <span class="source-line-no">064</span><span id="line-64"> if (!hasRemaining()) {</span> |
| <span class="source-line-no">065</span><span id="line-65"> return 0;</span> |
| <span class="source-line-no">066</span><span id="line-66"> }</span> |
| <span class="source-line-no">067</span><span id="line-67"> long written = 0;</span> |
| <span class="source-line-no">068</span><span id="line-68"> for (ByteBuffer bb : this.buffers) {</span> |
| <span class="source-line-no">069</span><span id="line-69"> if (bb.hasRemaining()) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> final int pos = bb.position();</span> |
| <span class="source-line-no">071</span><span id="line-71"> final int result = channel.write(bb);</span> |
| <span class="source-line-no">072</span><span id="line-72"> if (result <= 0) {</span> |
| <span class="source-line-no">073</span><span id="line-73"> // Write error. Return how much we were able to write until now.</span> |
| <span class="source-line-no">074</span><span id="line-74"> return written;</span> |
| <span class="source-line-no">075</span><span id="line-75"> }</span> |
| <span class="source-line-no">076</span><span id="line-76"> // Adjust the position of buffers already written so we don't write out</span> |
| <span class="source-line-no">077</span><span id="line-77"> // duplicate data upon retry of incomplete write with the same buffer chain.</span> |
| <span class="source-line-no">078</span><span id="line-78"> bb.position(pos + result);</span> |
| <span class="source-line-no">079</span><span id="line-79"> remaining -= result;</span> |
| <span class="source-line-no">080</span><span id="line-80"> written += result;</span> |
| <span class="source-line-no">081</span><span id="line-81"> }</span> |
| <span class="source-line-no">082</span><span id="line-82"> }</span> |
| <span class="source-line-no">083</span><span id="line-83"> return written;</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"></span> |
| <span class="source-line-no">086</span><span id="line-86"> int size() {</span> |
| <span class="source-line-no">087</span><span id="line-87"> return size;</span> |
| <span class="source-line-no">088</span><span id="line-88"> }</span> |
| <span class="source-line-no">089</span><span id="line-89"></span> |
| <span class="source-line-no">090</span><span id="line-90"> ByteBuffer[] getBuffers() {</span> |
| <span class="source-line-no">091</span><span id="line-91"> return this.buffers;</span> |
| <span class="source-line-no">092</span><span id="line-92"> }</span> |
| <span class="source-line-no">093</span><span id="line-93">}</span> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
