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.Closeable;
021import java.util.concurrent.CompletableFuture;
022import org.apache.hadoop.hbase.RegionLocations;
023import org.apache.hadoop.hbase.ServerName;
024import org.apache.yetus.audience.InterfaceAudience;
025
026/**
027 * Implementations hold cluster information such as this cluster's id, location of hbase:meta, etc..
028 * Internal use only.
029 */
030@InterfaceAudience.Private
031interface AsyncRegistry extends Closeable {
032
033  /**
034   * Get the location of meta region.
035   */
036  CompletableFuture<RegionLocations> getMetaRegionLocation();
037
038  /**
039   * Should only be called once.
040   * <p>
041   * The upper layer should store this value somewhere as it will not be change any more.
042   */
043  CompletableFuture<String> getClusterId();
044
045  /**
046   * Get the address of HMaster.
047   */
048  CompletableFuture<ServerName> getMasterAddress();
049
050  /**
051   * Closes this instance and releases any system resources associated with it
052   */
053  @Override
054  void close();
055}