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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.client;</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.InterruptedIOException;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.ArrayDeque;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.Queue;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.client.metrics.ScanMetrics;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">026</span><span id="line-26"></span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hbase.thirdparty.com.google.common.base.Throwables;</span> |
| <span class="source-line-no">028</span><span id="line-28"></span> |
| <span class="source-line-no">029</span><span id="line-29">/**</span> |
| <span class="source-line-no">030</span><span id="line-30"> * A ResultScanner which will only send request to RS when there are no cached results when calling</span> |
| <span class="source-line-no">031</span><span id="line-31"> * next, just like the ResultScanner in the old time. Mainly used for writing UTs, that we can</span> |
| <span class="source-line-no">032</span><span id="line-32"> * control when to send request to RS. The default ResultScanner implementation will fetch in</span> |
| <span class="source-line-no">033</span><span id="line-33"> * background.</span> |
| <span class="source-line-no">034</span><span id="line-34"> */</span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">public class ScanPerNextResultScanner implements ResultScanner, AdvancedScanResultConsumer {</span> |
| <span class="source-line-no">037</span><span id="line-37"></span> |
| <span class="source-line-no">038</span><span id="line-38"> private final AsyncTable<AdvancedScanResultConsumer> table;</span> |
| <span class="source-line-no">039</span><span id="line-39"></span> |
| <span class="source-line-no">040</span><span id="line-40"> private final Scan scan;</span> |
| <span class="source-line-no">041</span><span id="line-41"></span> |
| <span class="source-line-no">042</span><span id="line-42"> private final Queue<Result> queue = new ArrayDeque<>();</span> |
| <span class="source-line-no">043</span><span id="line-43"></span> |
| <span class="source-line-no">044</span><span id="line-44"> private ScanMetrics scanMetrics;</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> private boolean closed = false;</span> |
| <span class="source-line-no">047</span><span id="line-47"></span> |
| <span class="source-line-no">048</span><span id="line-48"> private Throwable error;</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> private ScanResumer resumer;</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 ScanPerNextResultScanner(AsyncTable<AdvancedScanResultConsumer> table, Scan scan) {</span> |
| <span class="source-line-no">053</span><span id="line-53"> this.table = table;</span> |
| <span class="source-line-no">054</span><span id="line-54"> this.scan = scan;</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> @Override</span> |
| <span class="source-line-no">058</span><span id="line-58"> public synchronized void onError(Throwable error) {</span> |
| <span class="source-line-no">059</span><span id="line-59"> this.error = error;</span> |
| <span class="source-line-no">060</span><span id="line-60"> notifyAll();</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"> @Override</span> |
| <span class="source-line-no">064</span><span id="line-64"> public synchronized void onComplete() {</span> |
| <span class="source-line-no">065</span><span id="line-65"> closed = true;</span> |
| <span class="source-line-no">066</span><span id="line-66"> notifyAll();</span> |
| <span class="source-line-no">067</span><span id="line-67"> }</span> |
| <span class="source-line-no">068</span><span id="line-68"></span> |
| <span class="source-line-no">069</span><span id="line-69"> @Override</span> |
| <span class="source-line-no">070</span><span id="line-70"> public void onScanMetricsCreated(ScanMetrics scanMetrics) {</span> |
| <span class="source-line-no">071</span><span id="line-71"> this.scanMetrics = scanMetrics;</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"> @Override</span> |
| <span class="source-line-no">075</span><span id="line-75"> public synchronized void onNext(Result[] results, ScanController controller) {</span> |
| <span class="source-line-no">076</span><span id="line-76"> assert results.length > 0;</span> |
| <span class="source-line-no">077</span><span id="line-77"> if (closed) {</span> |
| <span class="source-line-no">078</span><span id="line-78"> controller.terminate();</span> |
| <span class="source-line-no">079</span><span id="line-79"> return;</span> |
| <span class="source-line-no">080</span><span id="line-80"> }</span> |
| <span class="source-line-no">081</span><span id="line-81"> for (Result result : results) {</span> |
| <span class="source-line-no">082</span><span id="line-82"> queue.add(result);</span> |
| <span class="source-line-no">083</span><span id="line-83"> }</span> |
| <span class="source-line-no">084</span><span id="line-84"> notifyAll();</span> |
| <span class="source-line-no">085</span><span id="line-85"> resumer = controller.suspend();</span> |
| <span class="source-line-no">086</span><span id="line-86"> }</span> |
| <span class="source-line-no">087</span><span id="line-87"></span> |
| <span class="source-line-no">088</span><span id="line-88"> @Override</span> |
| <span class="source-line-no">089</span><span id="line-89"> public synchronized void onHeartbeat(ScanController controller) {</span> |
| <span class="source-line-no">090</span><span id="line-90"> if (closed) {</span> |
| <span class="source-line-no">091</span><span id="line-91"> controller.terminate();</span> |
| <span class="source-line-no">092</span><span id="line-92"> return;</span> |
| <span class="source-line-no">093</span><span id="line-93"> }</span> |
| <span class="source-line-no">094</span><span id="line-94"> if (scan.isNeedCursorResult()) {</span> |
| <span class="source-line-no">095</span><span id="line-95"> controller.cursor().ifPresent(c -> queue.add(Result.createCursorResult(c)));</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> |
| <span class="source-line-no">098</span><span id="line-98"></span> |
| <span class="source-line-no">099</span><span id="line-99"> @Override</span> |
| <span class="source-line-no">100</span><span id="line-100"> public synchronized Result next() throws IOException {</span> |
| <span class="source-line-no">101</span><span id="line-101"> if (queue.isEmpty()) {</span> |
| <span class="source-line-no">102</span><span id="line-102"> if (resumer != null) {</span> |
| <span class="source-line-no">103</span><span id="line-103"> resumer.resume();</span> |
| <span class="source-line-no">104</span><span id="line-104"> resumer = null;</span> |
| <span class="source-line-no">105</span><span id="line-105"> } else {</span> |
| <span class="source-line-no">106</span><span id="line-106"> table.scan(scan, this);</span> |
| <span class="source-line-no">107</span><span id="line-107"> }</span> |
| <span class="source-line-no">108</span><span id="line-108"> }</span> |
| <span class="source-line-no">109</span><span id="line-109"> while (queue.isEmpty()) {</span> |
| <span class="source-line-no">110</span><span id="line-110"> if (closed) {</span> |
| <span class="source-line-no">111</span><span id="line-111"> return null;</span> |
| <span class="source-line-no">112</span><span id="line-112"> }</span> |
| <span class="source-line-no">113</span><span id="line-113"> if (error != null) {</span> |
| <span class="source-line-no">114</span><span id="line-114"> Throwables.propagateIfPossible(error, IOException.class);</span> |
| <span class="source-line-no">115</span><span id="line-115"> throw new IOException(error);</span> |
| <span class="source-line-no">116</span><span id="line-116"> }</span> |
| <span class="source-line-no">117</span><span id="line-117"> try {</span> |
| <span class="source-line-no">118</span><span id="line-118"> wait();</span> |
| <span class="source-line-no">119</span><span id="line-119"> } catch (InterruptedException e) {</span> |
| <span class="source-line-no">120</span><span id="line-120"> throw new InterruptedIOException();</span> |
| <span class="source-line-no">121</span><span id="line-121"> }</span> |
| <span class="source-line-no">122</span><span id="line-122"> }</span> |
| <span class="source-line-no">123</span><span id="line-123"> return queue.poll();</span> |
| <span class="source-line-no">124</span><span id="line-124"> }</span> |
| <span class="source-line-no">125</span><span id="line-125"></span> |
| <span class="source-line-no">126</span><span id="line-126"> @Override</span> |
| <span class="source-line-no">127</span><span id="line-127"> public synchronized void close() {</span> |
| <span class="source-line-no">128</span><span id="line-128"> closed = true;</span> |
| <span class="source-line-no">129</span><span id="line-129"> queue.clear();</span> |
| <span class="source-line-no">130</span><span id="line-130"> if (resumer != null) {</span> |
| <span class="source-line-no">131</span><span id="line-131"> resumer.resume();</span> |
| <span class="source-line-no">132</span><span id="line-132"> resumer = null;</span> |
| <span class="source-line-no">133</span><span id="line-133"> }</span> |
| <span class="source-line-no">134</span><span id="line-134"> notifyAll();</span> |
| <span class="source-line-no">135</span><span id="line-135"> }</span> |
| <span class="source-line-no">136</span><span id="line-136"></span> |
| <span class="source-line-no">137</span><span id="line-137"> @Override</span> |
| <span class="source-line-no">138</span><span id="line-138"> public boolean renewLease() {</span> |
| <span class="source-line-no">139</span><span id="line-139"> // The renew lease operation will be handled in background</span> |
| <span class="source-line-no">140</span><span id="line-140"> return false;</span> |
| <span class="source-line-no">141</span><span id="line-141"> }</span> |
| <span class="source-line-no">142</span><span id="line-142"></span> |
| <span class="source-line-no">143</span><span id="line-143"> @Override</span> |
| <span class="source-line-no">144</span><span id="line-144"> public ScanMetrics getScanMetrics() {</span> |
| <span class="source-line-no">145</span><span id="line-145"> return scanMetrics;</span> |
| <span class="source-line-no">146</span><span id="line-146"> }</span> |
| <span class="source-line-no">147</span><span id="line-147">}</span> |
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| </pre> |
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