/interpreter/tags/at2-build060407/src/edu/vub/at/actors/eventloops/FutureEvent.java

 1/**
 2 * AmbientTalk/2 Project
 3 * FutureEvent.java created on 27-dec-2006 at 15:50:33
 4 * (c) Programming Technology Lab, 2006 - 2007
 5 * Authors: Tom Van Cutsem & Stijn Mostinckx
 6 * 
 7 * Permission is hereby granted, free of charge, to any person
 8 * obtaining a copy of this software and associated documentation
 9 * files (the "Software"), to deal in the Software without
10 * restriction, including without limitation the rights to use,
11 * copy, modify, merge, publish, distribute, sublicense, and/or
12 * sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following
14 * conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
21 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
23 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
27 */
28package edu.vub.at.actors.eventloops;
29
30/**
31 * A Future Event has an associated Future object to which the event
32 * will pass the return value or exception of a certain computation to be
33 * specified by a subclass.
34 *
35 * @author tvcutsem
36 */
37public abstract class FutureEvent extends Event {
38
39	private final Future future_;
40
41	public FutureEvent(String description, Future reply) {
42		super(description);
43		future_ = reply;
44	}
45	
46	public FutureEvent(Future reply) {
47		future_ = reply;
48	}
49	
50	public void process(Object owner) {
51		try {
52			Object result = this.execute(owner);
53			future_.resolve(result);
54		} catch(Exception e) {
55			future_.ruin(e);
56		}
57	}
58	
59	public abstract Object execute(Object owner) throws Exception;
60
61}