1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.hadoop.hbase.client; 19 20 import java.io.IOException; 21 22 import org.apache.hadoop.hbase.classification.InterfaceAudience; 23 import org.apache.hadoop.hbase.RegionLocations; 24 import org.apache.hadoop.hbase.TableName; 25 26 /** 27 * Cluster registry. 28 * Implementations hold cluster information such as this cluster's id, location of hbase:meta, etc. 29 * Internal use only. 30 */ 31 @InterfaceAudience.Private 32 interface Registry { 33 /** 34 * @param connection 35 */ 36 void init(Connection connection); 37 38 /** 39 * @return Meta region location 40 * @throws IOException 41 */ 42 RegionLocations getMetaRegionLocation() throws IOException; 43 44 /** 45 * @return Cluster id. 46 */ 47 String getClusterId(); 48 49 /** 50 * @param enabled Return true if table is enabled 51 * @throws IOException 52 */ 53 boolean isTableOnlineState(TableName tableName, boolean enabled) throws IOException; 54 55 /** 56 * @return Count of 'running' regionservers 57 * @throws IOException 58 */ 59 int getCurrentNrHRS() throws IOException; 60 }