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.TableName; 23 import org.apache.hadoop.hbase.HRegionLocation; 24 25 /** 26 * Cluster registry. 27 * Implemenations hold cluster information such as this cluster's id, location of hbase:meta, etc. 28 */ 29 interface Registry { 30 /** 31 * @param connection 32 */ 33 void init(HConnection connection); 34 35 /** 36 * @return Meta region location 37 * @throws IOException 38 */ 39 HRegionLocation getMetaRegionLocation() throws IOException; 40 41 /** 42 * @return Cluster id. 43 */ 44 String getClusterId(); 45 46 /** 47 * @param enabled Return true if table is enabled 48 * @throws IOException 49 */ 50 boolean isTableOnlineState(TableName tableName, boolean enabled) throws IOException; 51 52 /** 53 * @return Count of 'running' regionservers 54 * @throws IOException 55 */ 56 int getCurrentNrHRS() throws IOException; 57 }