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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase;
20  
21  import org.apache.hadoop.classification.InterfaceAudience;
22  import org.apache.hadoop.conf.Configuration;
23  import org.apache.hadoop.hbase.catalog.CatalogTracker;
24  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
25  
26  /**
27   * Defines the set of shared functions implemented by HBase servers (Masters
28   * and RegionServers).
29   */
30  @InterfaceAudience.Private
31  public interface Server extends Abortable, Stoppable {
32    /**
33     * Gets the configuration object for this server.
34     */
35    Configuration getConfiguration();
36  
37    /**
38     * Gets the ZooKeeper instance for this server.
39     */
40    ZooKeeperWatcher getZooKeeper();
41  
42    /**
43     * @return Master's instance of {@link CatalogTracker}
44     */
45    CatalogTracker getCatalogTracker();
46  
47    /**
48     * @return The unique server name for this server.
49     */
50    ServerName getServerName();
51  }