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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.rest;</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.io.OutputStream;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.client.Result;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.client.ResultScanner;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.rest.model.CellSetModel;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.slf4j.Logger;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">029</span><span id="line-29"></span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hbase.thirdparty.javax.ws.rs.WebApplicationException;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hbase.thirdparty.javax.ws.rs.core.StreamingOutput;</span> |
| <span class="source-line-no">032</span><span id="line-32"></span> |
| <span class="source-line-no">033</span><span id="line-33">@InterfaceAudience.Private</span> |
| <span class="source-line-no">034</span><span id="line-34">public class ProtobufStreamingOutput implements StreamingOutput {</span> |
| <span class="source-line-no">035</span><span id="line-35"> private static final Logger LOG = LoggerFactory.getLogger(ProtobufStreamingOutput.class);</span> |
| <span class="source-line-no">036</span><span id="line-36"></span> |
| <span class="source-line-no">037</span><span id="line-37"> private String contentType;</span> |
| <span class="source-line-no">038</span><span id="line-38"> private ResultScanner resultScanner;</span> |
| <span class="source-line-no">039</span><span id="line-39"> private int limit;</span> |
| <span class="source-line-no">040</span><span id="line-40"> private int fetchSize;</span> |
| <span class="source-line-no">041</span><span id="line-41"></span> |
| <span class="source-line-no">042</span><span id="line-42"> protected ProtobufStreamingOutput(ResultScanner scanner, String type, int limit, int fetchSize) {</span> |
| <span class="source-line-no">043</span><span id="line-43"> this.resultScanner = scanner;</span> |
| <span class="source-line-no">044</span><span id="line-44"> this.contentType = type;</span> |
| <span class="source-line-no">045</span><span id="line-45"> this.limit = limit;</span> |
| <span class="source-line-no">046</span><span id="line-46"> this.fetchSize = fetchSize;</span> |
| <span class="source-line-no">047</span><span id="line-47"> if (LOG.isTraceEnabled()) {</span> |
| <span class="source-line-no">048</span><span id="line-48"> LOG.trace("Created StreamingOutput with content type = " + this.contentType + " user limit : "</span> |
| <span class="source-line-no">049</span><span id="line-49"> + this.limit + " scan fetch size : " + this.fetchSize);</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"></span> |
| <span class="source-line-no">053</span><span id="line-53"> @Override</span> |
| <span class="source-line-no">054</span><span id="line-54"> public void write(OutputStream outStream) throws IOException, WebApplicationException {</span> |
| <span class="source-line-no">055</span><span id="line-55"> Result[] rowsToSend;</span> |
| <span class="source-line-no">056</span><span id="line-56"> if (limit < fetchSize) {</span> |
| <span class="source-line-no">057</span><span id="line-57"> rowsToSend = this.resultScanner.next(limit);</span> |
| <span class="source-line-no">058</span><span id="line-58"> writeToStream(createModelFromResults(rowsToSend), this.contentType, outStream);</span> |
| <span class="source-line-no">059</span><span id="line-59"> } else {</span> |
| <span class="source-line-no">060</span><span id="line-60"> int count = limit;</span> |
| <span class="source-line-no">061</span><span id="line-61"> while (count > 0) {</span> |
| <span class="source-line-no">062</span><span id="line-62"> if (count < fetchSize) {</span> |
| <span class="source-line-no">063</span><span id="line-63"> rowsToSend = this.resultScanner.next(count);</span> |
| <span class="source-line-no">064</span><span id="line-64"> } else {</span> |
| <span class="source-line-no">065</span><span id="line-65"> rowsToSend = this.resultScanner.next(this.fetchSize);</span> |
| <span class="source-line-no">066</span><span id="line-66"> }</span> |
| <span class="source-line-no">067</span><span id="line-67"> if (rowsToSend.length == 0) {</span> |
| <span class="source-line-no">068</span><span id="line-68"> break;</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"> count = count - rowsToSend.length;</span> |
| <span class="source-line-no">071</span><span id="line-71"> writeToStream(createModelFromResults(rowsToSend), this.contentType, outStream);</span> |
| <span class="source-line-no">072</span><span id="line-72"> }</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"></span> |
| <span class="source-line-no">076</span><span id="line-76"> private void writeToStream(CellSetModel model, String contentType, OutputStream outStream)</span> |
| <span class="source-line-no">077</span><span id="line-77"> throws IOException {</span> |
| <span class="source-line-no">078</span><span id="line-78"> byte[] objectBytes = model.createProtobufOutput();</span> |
| <span class="source-line-no">079</span><span id="line-79"> outStream.write(Bytes.toBytes((short) objectBytes.length));</span> |
| <span class="source-line-no">080</span><span id="line-80"> outStream.write(objectBytes);</span> |
| <span class="source-line-no">081</span><span id="line-81"> outStream.flush();</span> |
| <span class="source-line-no">082</span><span id="line-82"> if (LOG.isTraceEnabled()) {</span> |
| <span class="source-line-no">083</span><span id="line-83"> LOG.trace("Wrote " + model.getRows().size() + " rows to stream successfully.");</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"></span> |
| <span class="source-line-no">087</span><span id="line-87"> private CellSetModel createModelFromResults(Result[] results) {</span> |
| <span class="source-line-no">088</span><span id="line-88"> CellSetModel cellSetModel = new CellSetModel();</span> |
| <span class="source-line-no">089</span><span id="line-89"> for (int i = 0; i < results.length; i++) {</span> |
| <span class="source-line-no">090</span><span id="line-90"> if (results[i].isEmpty()) {</span> |
| <span class="source-line-no">091</span><span id="line-91"> continue;</span> |
| <span class="source-line-no">092</span><span id="line-92"> }</span> |
| <span class="source-line-no">093</span><span id="line-93"> cellSetModel.addRow(RestUtil.createRowModelFromResult(results[i]));</span> |
| <span class="source-line-no">094</span><span id="line-94"> }</span> |
| <span class="source-line-no">095</span><span id="line-95"> return cellSetModel;</span> |
| <span class="source-line-no">096</span><span id="line-96"> }</span> |
| <span class="source-line-no">097</span><span id="line-97">}</span> |
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| </pre> |
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