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Java > Open Source Codes > org > springframework > context > ApplicationEvent


1 /*
2  * Copyright 2002-2006 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.springframework.context;
18
19 import java.util.EventObject JavaDoc;
20
21 /**
22  * Class to be extended by all application events.
23  * Abstract as it doesn't make sense for generic events
24  * to be published directly.
25  *
26  * @author Rod Johnson
27  * @author Juergen Hoeller
28  */
29 public abstract class ApplicationEvent extends EventObject JavaDoc {
30
31     /** use serialVersionUID from Spring 1.2 for interoperability */
32     private static final long serialVersionUID = 7099057708183571937L;
33
34     /** System time when the event happened */
35     private final long timestamp;
36
37
38     /**
39      * Create a new ApplicationEvent.
40      * @param source the component that published the event (never <code>null</code>)
41      */
42     public ApplicationEvent(Object JavaDoc source) {
43         super(source);
44         this.timestamp = System.currentTimeMillis();
45     }
46
47
48     /**
49      * Return the system time in milliseconds when the event happened.
50      */
51     public final long getTimestamp() {
52         return timestamp;
53     }
54
55 }
56
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