/**
* 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.hadoop.hbase.classification.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();
}