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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  }