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 .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 }