1 /** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 package org.apache.hadoop.hbase; 20 21 import org.apache.hadoop.conf.Configuration; 22 import org.apache.hadoop.hbase.classification.InterfaceAudience; 23 import org.apache.hadoop.hbase.client.ClusterConnection; 24 import org.apache.hadoop.hbase.zookeeper.MetaTableLocator; 25 import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher; 26 27 /** 28 * Defines the set of shared functions implemented by HBase servers (Masters 29 * and RegionServers). 30 */ 31 @InterfaceAudience.Private 32 public interface Server extends Abortable, Stoppable { 33 /** 34 * Gets the configuration object for this server. 35 */ 36 Configuration getConfiguration(); 37 38 /** 39 * Gets the ZooKeeper instance for this server. 40 */ 41 ZooKeeperWatcher getZooKeeper(); 42 43 /** 44 * Returns a reference to the servers' cluster connection. 45 * 46 * Important note: this method returns a reference to Connection which is managed 47 * by Server itself, so callers must NOT attempt to close connection obtained. 48 */ 49 ClusterConnection getConnection(); 50 51 /** 52 * Returns instance of {@link org.apache.hadoop.hbase.zookeeper.MetaTableLocator} 53 * running inside this server. This MetaServerLocator is started and stopped by server, clients 54 * shouldn't manage it's lifecycle. 55 * @return instance of {@link MetaTableLocator} associated with this server. 56 */ 57 MetaTableLocator getMetaTableLocator(); 58 59 /** 60 * @return The unique server name for this server. 61 */ 62 ServerName getServerName(); 63 64 /** 65 * Get CoordinatedStateManager instance for this server. 66 */ 67 CoordinatedStateManager getCoordinatedStateManager(); 68 }