01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.events;
22:
23: /**
24: * An event.
25: *
26: * Holds a list of {@link EventListener4} objects
27: * which receive {@link EventListener4#onEvent(Event4, EventArgs)}
28: * notifications whenever this event is triggered.
29: *
30: * @sharpen.ignore
31: */
32: public interface Event4 {
33:
34: /**
35: * Adds a new listener to the notification list..
36: *
37: * @sharpen.event.add
38: */
39: public void addListener(EventListener4 listener);
40:
41: /**
42: * Removes a previously registered listener from the notification list.
43: */
44: public void removeListener(EventListener4 listener);
45: }
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