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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.util.Collections;</span>
<span class="source-line-no">021</span><span id="line-21">import java.util.Map;</span>
<span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.CompletableFuture;</span>
<span class="source-line-no">023</span><span id="line-23">import java.util.concurrent.ConcurrentHashMap;</span>
<span class="source-line-no">024</span><span id="line-24">import java.util.function.Function;</span>
<span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.ServerName;</span>
<span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.util.FutureUtils;</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"></span>
<span class="source-line-no">029</span><span id="line-29">import org.apache.hbase.thirdparty.com.google.protobuf.RpcChannel;</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"> * Additional Asynchronous Admin capabilities for clients.</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.Public</span>
<span class="source-line-no">035</span><span id="line-35">public final class AsyncAdminClientUtils {</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 AsyncAdminClientUtils() {</span>
<span class="source-line-no">038</span><span id="line-38"> }</span>
<span class="source-line-no">039</span><span id="line-39"></span>
<span class="source-line-no">040</span><span id="line-40"> /**</span>
<span class="source-line-no">041</span><span id="line-41"> * Execute the given coprocessor call on all region servers.</span>
<span class="source-line-no">042</span><span id="line-42"> * &lt;p&gt;</span>
<span class="source-line-no">043</span><span id="line-43"> * The {@code stubMaker} is just a delegation to the {@code newStub} call. Usually it is only a</span>
<span class="source-line-no">044</span><span id="line-44"> * one line lambda expression, like:</span>
<span class="source-line-no">045</span><span id="line-45"> *</span>
<span class="source-line-no">046</span><span id="line-46"> * &lt;pre&gt;</span>
<span class="source-line-no">047</span><span id="line-47"> * channel -&amp;gt; xxxService.newStub(channel)</span>
<span class="source-line-no">048</span><span id="line-48"> * &lt;/pre&gt;</span>
<span class="source-line-no">049</span><span id="line-49"> *</span>
<span class="source-line-no">050</span><span id="line-50"> * @param asyncAdmin the asynchronous administrative API for HBase.</span>
<span class="source-line-no">051</span><span id="line-51"> * @param stubMaker a delegation to the actual {@code newStub} call.</span>
<span class="source-line-no">052</span><span id="line-52"> * @param callable a delegation to the actual protobuf rpc call. See the comment of</span>
<span class="source-line-no">053</span><span id="line-53"> * {@link ServiceCaller} for more details.</span>
<span class="source-line-no">054</span><span id="line-54"> * @param &lt;S&gt; the type of the asynchronous stub</span>
<span class="source-line-no">055</span><span id="line-55"> * @param &lt;R&gt; the type of the return value</span>
<span class="source-line-no">056</span><span id="line-56"> * @return Map of each region server to its result of the protobuf rpc call, wrapped by a</span>
<span class="source-line-no">057</span><span id="line-57"> * {@link CompletableFuture}.</span>
<span class="source-line-no">058</span><span id="line-58"> * @see ServiceCaller</span>
<span class="source-line-no">059</span><span id="line-59"> */</span>
<span class="source-line-no">060</span><span id="line-60"> public static &lt;S, R&gt; CompletableFuture&lt;Map&lt;ServerName, Object&gt;&gt;</span>
<span class="source-line-no">061</span><span id="line-61"> coprocessorServiceOnAllRegionServers(AsyncAdmin asyncAdmin, Function&lt;RpcChannel, S&gt; stubMaker,</span>
<span class="source-line-no">062</span><span id="line-62"> ServiceCaller&lt;S, R&gt; callable) {</span>
<span class="source-line-no">063</span><span id="line-63"> CompletableFuture&lt;Map&lt;ServerName, Object&gt;&gt; future = new CompletableFuture&lt;&gt;();</span>
<span class="source-line-no">064</span><span id="line-64"> FutureUtils.addListener(asyncAdmin.getRegionServers(), (regionServers, error) -&gt; {</span>
<span class="source-line-no">065</span><span id="line-65"> if (error != null) {</span>
<span class="source-line-no">066</span><span id="line-66"> future.completeExceptionally(error);</span>
<span class="source-line-no">067</span><span id="line-67"> return;</span>
<span class="source-line-no">068</span><span id="line-68"> }</span>
<span class="source-line-no">069</span><span id="line-69"> Map&lt;ServerName, Object&gt; resultMap = new ConcurrentHashMap&lt;&gt;();</span>
<span class="source-line-no">070</span><span id="line-70"> for (ServerName regionServer : regionServers) {</span>
<span class="source-line-no">071</span><span id="line-71"> FutureUtils.addListener(asyncAdmin.coprocessorService(stubMaker, callable, regionServer),</span>
<span class="source-line-no">072</span><span id="line-72"> (server, err) -&gt; {</span>
<span class="source-line-no">073</span><span id="line-73"> if (err != null) {</span>
<span class="source-line-no">074</span><span id="line-74"> resultMap.put(regionServer, err);</span>
<span class="source-line-no">075</span><span id="line-75"> } else {</span>
<span class="source-line-no">076</span><span id="line-76"> resultMap.put(regionServer, server);</span>
<span class="source-line-no">077</span><span id="line-77"> }</span>
<span class="source-line-no">078</span><span id="line-78"> if (resultMap.size() == regionServers.size()) {</span>
<span class="source-line-no">079</span><span id="line-79"> future.complete(Collections.unmodifiableMap(resultMap));</span>
<span class="source-line-no">080</span><span id="line-80"> }</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"> });</span>
<span class="source-line-no">084</span><span id="line-84"> return future;</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>
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