/interpreter/tags/at2dist160410/src/edu/vub/at/actors/net/cmd/CMDObjectTakenOffline.java

 1/**
 2 * AmbientTalk/2 Project
 3 * CMDObjectTakenOffline.java
 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.net.cmd;
29
30import edu.vub.at.actors.id.ATObjectID;
31import edu.vub.at.actors.natives.ELVirtualMachine;
32import edu.vub.at.actors.net.comm.Address;
33import edu.vub.at.actors.net.comm.CommunicationBus;
34
35/**
36 * A CMDObjectTakenOffline command is sent asynchronously to all connected VMs when 
37 * an actor on the sender VM takes one of its objects offline. Connected VMs are notified
38 * of this event so that they can check if they had a far remote reference to the offline object.
39 * 
40 * SENDER: the VM that takes an object offline
41 * RECEIVER: all connected VMs 
42 * MODE: ASYNCHRONOUS, MULTICAST
43 * PROPERTIES: objectID of the offline object
44 * REPLY: none
45 * 
46 * @author egonzale
47 */
48public class CMDObjectTakenOffline extends VMCommand{
49	
50	private static final long serialVersionUID = -4486874219940264597L;
51	
52	private final ATObjectID senderObjectId_;
53	
54	public CMDObjectTakenOffline(ATObjectID senderObjectId) {
55		super("objectTakenOffline");
56		senderObjectId_ = senderObjectId;
57	}
58	
59	public void send(CommunicationBus dispatcher, Address recipient) {
60		dispatcher.sendAsyncUnicast(this, recipient);
61	}
62	
63	public void broadcast(CommunicationBus dispatcher) {
64		dispatcher.sendAsyncMulticast(this);
65	}
66	
67	public void uponReceiptBy(ELVirtualMachine remoteHost, Address senderAddress) {
68		remoteHost.connectionManager_.notifyObjectTakenOffline(senderObjectId_);
69	}
70}