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.ServerName;
23 import org.apache.hadoop.hbase.classification.InterfaceAudience;
24 import org.apache.hadoop.hbase.RegionLocations;
25 import org.apache.hadoop.hbase.TableName;
26
27 /**
28 * Implementations hold cluster information such as this cluster's id, location of hbase:meta, etc.
29 * needed by cluster connections.
30 * Internal use only.
31 */
32 @InterfaceAudience.Private
33 interface ConnectionRegistry {
34 /**
35 * @param connection
36 */
37 void init(Connection connection) throws IOException;
38
39 /**
40 * @return the currently active master, null if none exists.
41 */
42 ServerName getActiveMaster() throws IOException;
43
44 /**
45 * @return Meta region location
46 * @throws IOException
47 */
48 RegionLocations getMetaRegionLocations() throws IOException;
49
50 /**
51 * @return Cluster id.
52 */
53 String getClusterId() throws IOException;
54
55 /**
56 * @param enabled Return true if table is enabled
57 */
58 boolean isTableOnlineState(TableName tableName, boolean enabled) throws IOException;
59
60 /**
61 * @return Count of 'running' regionservers
62 * @throws IOException
63 */
64 int getCurrentNrHRS() throws IOException;
65
66 /**
67 * Cleanup state, if any.
68 */
69 void close();
70 }