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| <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.codec;</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 edu.umd.cs.findbugs.annotations.NonNull;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.io.EOFException;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.io.IOException;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.io.InputStream;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.io.PushbackInputStream;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.ExtendedCell;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.HBaseInterfaceAudience;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.slf4j.Logger;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">030</span><span id="line-30"></span> |
| <span class="source-line-no">031</span><span id="line-31">/**</span> |
| <span class="source-line-no">032</span><span id="line-32"> * Base implementation for {@link Codec.Decoder}.</span> |
| <span class="source-line-no">033</span><span id="line-33"> */</span> |
| <span class="source-line-no">034</span><span id="line-34">@InterfaceAudience.LimitedPrivate({ HBaseInterfaceAudience.COPROC, HBaseInterfaceAudience.PHOENIX })</span> |
| <span class="source-line-no">035</span><span id="line-35">public abstract class BaseDecoder implements Codec.Decoder {</span> |
| <span class="source-line-no">036</span><span id="line-36"> protected static final Logger LOG = LoggerFactory.getLogger(BaseDecoder.class);</span> |
| <span class="source-line-no">037</span><span id="line-37"></span> |
| <span class="source-line-no">038</span><span id="line-38"> protected final InputStream in;</span> |
| <span class="source-line-no">039</span><span id="line-39"> private ExtendedCell current = null;</span> |
| <span class="source-line-no">040</span><span id="line-40"></span> |
| <span class="source-line-no">041</span><span id="line-41"> protected static class PBIS extends PushbackInputStream {</span> |
| <span class="source-line-no">042</span><span id="line-42"> public PBIS(InputStream in, int size) {</span> |
| <span class="source-line-no">043</span><span id="line-43"> super(in, size);</span> |
| <span class="source-line-no">044</span><span id="line-44"> }</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> public void resetBuf(int size) {</span> |
| <span class="source-line-no">047</span><span id="line-47"> this.buf = new byte[size];</span> |
| <span class="source-line-no">048</span><span id="line-48"> this.pos = size;</span> |
| <span class="source-line-no">049</span><span id="line-49"> }</span> |
| <span class="source-line-no">050</span><span id="line-50"> }</span> |
| <span class="source-line-no">051</span><span id="line-51"></span> |
| <span class="source-line-no">052</span><span id="line-52"> public BaseDecoder(final InputStream in) {</span> |
| <span class="source-line-no">053</span><span id="line-53"> this.in = new PBIS(in, 1);</span> |
| <span class="source-line-no">054</span><span id="line-54"> }</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> @Override</span> |
| <span class="source-line-no">057</span><span id="line-57"> public boolean advance() throws IOException {</span> |
| <span class="source-line-no">058</span><span id="line-58"> int firstByte = in.read();</span> |
| <span class="source-line-no">059</span><span id="line-59"> if (firstByte == -1) {</span> |
| <span class="source-line-no">060</span><span id="line-60"> return false;</span> |
| <span class="source-line-no">061</span><span id="line-61"> } else {</span> |
| <span class="source-line-no">062</span><span id="line-62"> ((PBIS) in).unread(firstByte);</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65"> try {</span> |
| <span class="source-line-no">066</span><span id="line-66"> this.current = parseCell();</span> |
| <span class="source-line-no">067</span><span id="line-67"> } catch (IOException ioEx) {</span> |
| <span class="source-line-no">068</span><span id="line-68"> ((PBIS) in).resetBuf(1); // reset the buffer in case the underlying stream is read from upper</span> |
| <span class="source-line-no">069</span><span id="line-69"> // layers</span> |
| <span class="source-line-no">070</span><span id="line-70"> rethrowEofException(ioEx);</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"> return true;</span> |
| <span class="source-line-no">073</span><span id="line-73"> }</span> |
| <span class="source-line-no">074</span><span id="line-74"></span> |
| <span class="source-line-no">075</span><span id="line-75"> private void rethrowEofException(IOException ioEx) throws IOException {</span> |
| <span class="source-line-no">076</span><span id="line-76"> boolean isEof = false;</span> |
| <span class="source-line-no">077</span><span id="line-77"> try {</span> |
| <span class="source-line-no">078</span><span id="line-78"> isEof = this.in.available() == 0;</span> |
| <span class="source-line-no">079</span><span id="line-79"> } catch (Throwable t) {</span> |
| <span class="source-line-no">080</span><span id="line-80"> LOG.trace("Error getting available for error message - ignoring", t);</span> |
| <span class="source-line-no">081</span><span id="line-81"> }</span> |
| <span class="source-line-no">082</span><span id="line-82"> if (!isEof) throw ioEx;</span> |
| <span class="source-line-no">083</span><span id="line-83"> if (LOG.isTraceEnabled()) {</span> |
| <span class="source-line-no">084</span><span id="line-84"> LOG.trace("Partial cell read caused by EOF", ioEx);</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"> EOFException eofEx = new EOFException("Partial cell read");</span> |
| <span class="source-line-no">087</span><span id="line-87"> eofEx.initCause(ioEx);</span> |
| <span class="source-line-no">088</span><span id="line-88"> throw eofEx;</span> |
| <span class="source-line-no">089</span><span id="line-89"> }</span> |
| <span class="source-line-no">090</span><span id="line-90"></span> |
| <span class="source-line-no">091</span><span id="line-91"> protected InputStream getInputStream() {</span> |
| <span class="source-line-no">092</span><span id="line-92"> return in;</span> |
| <span class="source-line-no">093</span><span id="line-93"> }</span> |
| <span class="source-line-no">094</span><span id="line-94"></span> |
| <span class="source-line-no">095</span><span id="line-95"> /**</span> |
| <span class="source-line-no">096</span><span id="line-96"> * Extract a Cell.</span> |
| <span class="source-line-no">097</span><span id="line-97"> * @return a parsed Cell or throws an Exception. EOFException or a generic IOException maybe</span> |
| <span class="source-line-no">098</span><span id="line-98"> * thrown if EOF is reached prematurely. Does not return null.</span> |
| <span class="source-line-no">099</span><span id="line-99"> */</span> |
| <span class="source-line-no">100</span><span id="line-100"> @NonNull</span> |
| <span class="source-line-no">101</span><span id="line-101"> protected abstract ExtendedCell parseCell() throws IOException;</span> |
| <span class="source-line-no">102</span><span id="line-102"></span> |
| <span class="source-line-no">103</span><span id="line-103"> @Override</span> |
| <span class="source-line-no">104</span><span id="line-104"> public ExtendedCell current() {</span> |
| <span class="source-line-no">105</span><span id="line-105"> return this.current;</span> |
| <span class="source-line-no">106</span><span id="line-106"> }</span> |
| <span class="source-line-no">107</span><span id="line-107">}</span> |
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| </pre> |
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