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 }