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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.coprocessor;
20  
21  import java.io.IOException;
22  
23  import org.apache.hadoop.hbase.Coprocessor;
24  
25  public interface RegionServerObserver extends Coprocessor {
26  
27    /**
28     * Called before stopping region server.
29     * @param env An instance of RegionServerCoprocessorEnvironment
30     * @throws IOException Signals that an I/O exception has occurred.
31     */
32    void preStopRegionServer(
33      final ObserverContext<RegionServerCoprocessorEnvironment> env)
34      throws IOException;
35  }