View Javadoc

1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.jci.monitor;
19  
20  import java.io.File;
21  
22  /**
23   * FilesystemAlterationObserver represents the state of files
24   * below a certain root directory. It implements the code to
25   * check the filesystem and notify listeners.
26   * 
27   * @author tcurdt
28   */
29  public interface FilesystemAlterationObserver {
30  
31      File getRootDirectory();
32  
33      void checkAndNotify();
34  
35      void addListener( final FilesystemAlterationListener pListener );
36  
37      void removeListener( final FilesystemAlterationListener pListener );
38  
39      FilesystemAlterationListener[] getListeners();
40  
41  }