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 }