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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.client;<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.util.ArrayList;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.Arrays;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.List;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><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>import org.apache.hadoop.hbase.util.Bytes;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>/**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * A scan result cache that only returns complete result.<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> */<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>@InterfaceAudience.Private<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>class CompleteScanResultCache implements ScanResultCache {<a name="line.32"></a> |
| <span class="sourceLineNo">033</span><a name="line.33"></a> |
| <span class="sourceLineNo">034</span> private int numberOfCompleteRows;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span><a name="line.35"></a> |
| <span class="sourceLineNo">036</span> private final List<Result> partialResults = new ArrayList<>();<a name="line.36"></a> |
| <span class="sourceLineNo">037</span><a name="line.37"></a> |
| <span class="sourceLineNo">038</span> private Result combine() throws IOException {<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> Result result = Result.createCompleteResult(partialResults);<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> partialResults.clear();<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> return result;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> }<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> private Result[] prependCombined(Result[] results, int length) throws IOException {<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> if (length == 0) {<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> return new Result[] { combine() };<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> }<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> // the last part of a partial result may not be marked as partial so here we need to check if<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> // there is a row change.<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> int start;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> if (Bytes.equals(partialResults.get(0).getRow(), results[0].getRow())) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> partialResults.add(results[0]);<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> start = 1;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> length--;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> } else {<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> start = 0;<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> }<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> Result[] prependResults = new Result[length + 1];<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> prependResults[0] = combine();<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> System.arraycopy(results, start, prependResults, 1, length);<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> return prependResults;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> }<a name="line.62"></a> |
| <span class="sourceLineNo">063</span><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> private Result[] updateNumberOfCompleteResultsAndReturn(Result... results) {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> numberOfCompleteRows += results.length;<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return results;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> }<a name="line.67"></a> |
| <span class="sourceLineNo">068</span><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> @Override<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> public Result[] addAndGet(Result[] results, boolean isHeartbeatMessage) throws IOException {<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> // If no results were returned it indicates that either we have the all the partial results<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> // necessary to construct the complete result or the server had to send a heartbeat message<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> // to the client to keep the client-server connection alive<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> if (results.length == 0) {<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> // If this response was an empty heartbeat message, then we have not exhausted the region<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> // and thus there may be more partials server side that still need to be added to the partial<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> // list before we form the complete Result<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> if (!partialResults.isEmpty() && !isHeartbeatMessage) {<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> return updateNumberOfCompleteResultsAndReturn(combine());<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> }<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> return EMPTY_RESULT_ARRAY;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> }<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> // In every RPC response there should be at most a single partial result. Furthermore, if<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> // there is a partial result, it is guaranteed to be in the last position of the array.<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> Result last = results[results.length - 1];<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> if (last.mayHaveMoreCellsInRow()) {<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> if (partialResults.isEmpty()) {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> partialResults.add(last);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> return updateNumberOfCompleteResultsAndReturn(Arrays.copyOf(results, results.length - 1));<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> }<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> // We have only one result and it is partial<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> if (results.length == 1) {<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> // check if there is a row change<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> if (Bytes.equals(partialResults.get(0).getRow(), last.getRow())) {<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> partialResults.add(last);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> return EMPTY_RESULT_ARRAY;<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> }<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> Result completeResult = combine();<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> partialResults.add(last);<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> return updateNumberOfCompleteResultsAndReturn(completeResult);<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> }<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> // We have some complete results<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> Result[] resultsToReturn = prependCombined(results, results.length - 1);<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> partialResults.add(last);<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> return updateNumberOfCompleteResultsAndReturn(resultsToReturn);<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> }<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> if (!partialResults.isEmpty()) {<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> return updateNumberOfCompleteResultsAndReturn(prependCombined(results, results.length));<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> }<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> return updateNumberOfCompleteResultsAndReturn(results);<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> }<a name="line.111"></a> |
| <span class="sourceLineNo">112</span><a name="line.112"></a> |
| <span class="sourceLineNo">113</span> @Override<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> public void clear() {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> partialResults.clear();<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> }<a name="line.116"></a> |
| <span class="sourceLineNo">117</span><a name="line.117"></a> |
| <span class="sourceLineNo">118</span> @Override<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> public int numberOfCompleteRows() {<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> return numberOfCompleteRows;<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> }<a name="line.121"></a> |
| <span class="sourceLineNo">122</span>}<a name="line.122"></a> |
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