001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.client; 019 020import java.io.IOException; 021import java.util.List; 022import java.util.Optional; 023import java.util.concurrent.CompletableFuture; 024import org.apache.hadoop.hbase.HRegionLocation; 025import org.apache.hadoop.hbase.RegionLocations; 026import org.apache.hadoop.hbase.ServerName; 027import org.apache.yetus.audience.InterfaceAudience; 028 029/** 030 * A {@link ConnectionRegistry} implementation used at server side, where we could use the 031 * {@link ConnectionRegistryEndpoint} directly, without any rpcs. 032 */ 033@InterfaceAudience.Private 034class ShortCircuitConnectionRegistry implements ConnectionRegistry { 035 036 private final ConnectionRegistryEndpoint endpoint; 037 038 public ShortCircuitConnectionRegistry(ConnectionRegistryEndpoint endpoint) { 039 this.endpoint = endpoint; 040 } 041 042 @Override 043 public CompletableFuture<RegionLocations> getMetaRegionLocations() { 044 CompletableFuture<RegionLocations> future = new CompletableFuture<>(); 045 List<HRegionLocation> locs = endpoint.getMetaLocations(); 046 if (locs.isEmpty()) { 047 future.completeExceptionally(new IOException("no meta location available")); 048 } else { 049 future.complete(new RegionLocations(locs)); 050 } 051 return future; 052 } 053 054 @Override 055 public CompletableFuture<String> getClusterId() { 056 return CompletableFuture.completedFuture(endpoint.getClusterId()); 057 } 058 059 @Override 060 public CompletableFuture<ServerName> getActiveMaster() { 061 CompletableFuture<ServerName> future = new CompletableFuture<>(); 062 Optional<ServerName> activeMaster = endpoint.getActiveMaster(); 063 if (activeMaster.isPresent()) { 064 future.complete(activeMaster.get()); 065 } else { 066 future.completeExceptionally(new IOException("no active master available")); 067 } 068 return future; 069 } 070 071 @Override 072 public String getConnectionString() { 073 return "short-circuit"; 074 } 075 076 @Override 077 public void close() { 078 // nothing 079 } 080}