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hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncAdminClientUtils.java
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|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.apache.hadoop.hbase.client; | ||
|
|
||
| import java.util.Collections; | ||
| import java.util.Map; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.function.Function; | ||
| import org.apache.hadoop.hbase.ServerName; | ||
| import org.apache.hadoop.hbase.util.FutureUtils; | ||
| import org.apache.yetus.audience.InterfaceAudience; | ||
|
|
||
| import org.apache.hbase.thirdparty.com.google.protobuf.RpcChannel; | ||
|
|
||
| /** | ||
| * Additional Asynchronous Admin capabilities for clients. | ||
| */ | ||
| @InterfaceAudience.Public | ||
| public final class AsyncAdminClientUtils { | ||
|
|
||
| private AsyncAdminClientUtils() { | ||
| } | ||
|
|
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| /** | ||
| * Execute the given coprocessor call on all region servers. | ||
| * <p> | ||
| * The {@code stubMaker} is just a delegation to the {@code newStub} call. Usually it is only a | ||
| * one line lambda expression, like: | ||
| * | ||
| * <pre> | ||
| * channel -> xxxService.newStub(channel) | ||
| * </pre> | ||
| * | ||
| * @param asyncAdmin the asynchronous administrative API for HBase. | ||
| * @param stubMaker a delegation to the actual {@code newStub} call. | ||
| * @param callable a delegation to the actual protobuf rpc call. See the comment of | ||
| * {@link ServiceCaller} for more details. | ||
| * @param <S> the type of the asynchronous stub | ||
| * @param <R> the type of the return value | ||
| * @return Map of each region server to its result of the protobuf rpc call, wrapped by a | ||
| * {@link CompletableFuture}. | ||
| * @see ServiceCaller | ||
| */ | ||
| public static <S, R> CompletableFuture<Map<ServerName, Object>> | ||
| coprocessorServiceOnAllRegionServers(AsyncAdmin asyncAdmin, Function<RpcChannel, S> stubMaker, | ||
| ServiceCaller<S, R> callable) { | ||
| CompletableFuture<Map<ServerName, Object>> future = new CompletableFuture<>(); | ||
| FutureUtils.addListener(asyncAdmin.getRegionServers(), (regionServers, error) -> { | ||
| if (error != null) { | ||
| future.completeExceptionally(error); | ||
| return; | ||
| } | ||
| Map<ServerName, Object> resultMap = new ConcurrentHashMap<>(); | ||
| for (ServerName regionServer : regionServers) { | ||
| FutureUtils.addListener(asyncAdmin.coprocessorService(stubMaker, callable, regionServer), | ||
| (server, err) -> { | ||
| if (err != null) { | ||
| resultMap.put(regionServer, err); | ||
| } else { | ||
| resultMap.put(regionServer, server); | ||
| } | ||
| if (resultMap.size() == regionServers.size()) { | ||
| future.complete(Collections.unmodifiableMap(resultMap)); | ||
| } | ||
| }); | ||
| } | ||
| }); | ||
| return future; | ||
| } | ||
| } |
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