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.conf;
19
20 import org.apache.hadoop.conf.Configuration;
21 import org.apache.hadoop.hbase.classification.InterfaceAudience;
22 import org.apache.hadoop.hbase.classification.InterfaceStability;
23
24 /**
25 * Every class that wants to observe changes in Configuration properties,
26 * must implement interface (and also, register itself with the
27 * <code>ConfigurationManager</code> object.
28 */
29 @InterfaceAudience.Private
30 @InterfaceStability.Evolving
31 public interface ConfigurationObserver {
32
33 /**
34 * This method would be called by the {@link ConfigurationManager}
35 * object when the {@link Configuration} object is reloaded from disk.
36 */
37 void onConfigurationChange(Configuration conf);
38 }