| /** |
| * 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.io.Closeable; |
| import java.util.concurrent.CompletableFuture; |
| |
| import org.apache.hadoop.hbase.RegionLocations; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * Implementations hold cluster information such as this cluster's id, location of hbase:meta, etc.. |
| * All stuffs that may be related to zookeeper at client side are placed here. |
| * <p> |
| * Internal use only. |
| */ |
| @InterfaceAudience.Private |
| interface AsyncRegistry extends Closeable { |
| |
| /** |
| * Get the location of meta region. |
| */ |
| CompletableFuture<RegionLocations> getMetaRegionLocation(); |
| |
| /** |
| * Should only be called once. |
| * <p> |
| * The upper layer should store this value somewhere as it will not be change any more. |
| */ |
| CompletableFuture<String> getClusterId(); |
| |
| /** |
| * Get the number of 'running' regionservers. |
| */ |
| CompletableFuture<Integer> getCurrentNrHRS(); |
| |
| /** |
| * Get the address of HMaster. |
| */ |
| CompletableFuture<ServerName> getMasterAddress(); |
| |
| /** |
| * Get the info port of HMaster. |
| */ |
| CompletableFuture<Integer> getMasterInfoPort(); |
| |
| /** |
| * Closes this instance and releases any system resources associated with it |
| */ |
| @Override |
| void close(); |
| } |