/interpreter/tags/at2dist110511/src/edu/vub/at/actors/net/cmd/CMDInitRequireServices.java

 1/**
 2 * AmbientTalk/2 Project
 3 * VMInitialDiscovery.java created on 22-feb-2007 at 13:20:13
 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.natives.ELVirtualMachine;
31import edu.vub.at.actors.net.comm.Address;
32import edu.vub.at.actors.net.comm.CommunicationBus;
33
34import java.util.Set;
35
36
37/**
38 * A CMDInitRequireServices message is sent asynchronously to any VM just discovered in the environment
39 * if the discovering VM has some open subscriptions. This command is sent to the discovered VM to ask
40 * it whether it has any publications matching the outstanding subscriptions at the sender VM.
41 * 
42 * SENDER: the discovering VM
43 * RECEIVER: the discovered VM
44 * MODE: ASYNCHRONOUS, UNICAST
45 * PROPERTIES: outstanding subscription topics of sender
46 * REPLY: potential CMDJoinServices
47 * 
48 * @author tvcutsem
49 */
50
51public class CMDInitRequireServices extends VMCommand {
52
53	private static final long serialVersionUID = 7177638111444788771L;
54	
55	/**
56	 * A Set of Packet objects representing serialized ATTypeTag topics.
57	 */
58	private final Set topics_;
59	
60	public CMDInitRequireServices(Set topics) {
61		super("initRequireServices");
62		topics_ = topics;
63	}
64	
65	public void send(CommunicationBus dispatcher, Address recipientVM) {
66		dispatcher.sendAsyncUnicast(this, recipientVM);
67	}
68	
69	public void uponReceiptBy(ELVirtualMachine remoteHost, Address senderAddress) {
70		// query local discoverymanager for matching topics
71		remoteHost.discoveryActor_.event_receiveNewSubscriptionsFrom(topics_, senderAddress);
72	}
73	
74}