01: /*
02: * Copyright 2002-2006 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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;
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 {
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: * Create a new ApplicationEvent.
39: * @param source the component that published the event (never <code>null</code>)
40: */
41: public ApplicationEvent(Object source) {
42: super (source);
43: this .timestamp = System.currentTimeMillis();
44: }
45:
46: /**
47: * Return the system time in milliseconds when the event happened.
48: */
49: public final long getTimestamp() {
50: return timestamp;
51: }
52:
53: }
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