/interpreter/tags/at2dist130208/src/edu/vub/at/actors/net/cmd/CMDHandshake.java

 1/**
 2 * AmbientTalk/2 Project
 3 * CMDHandshake.java created on 22-feb-2007 at 20:26:21
 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.VirtualMachineID;
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/**
37 * A handshake command is sent when a VM discovers another VM in its environment.
38 * It sends its own VirtualMachineID to the newly discovered VM, which can then add this VirtualMachineID
39 * to its VM address book.
40 *
41 * SENDER: the discovering VM
42 * RECEIVER: the discovered VM
43 * MODE: ASYNCHRONOUS, UNICAST
44 * PROPERTIES: VirtualMachineID of sender
45 * REPLY: none
46 * 
47 * @author tvcutsem
48 */
49public class CMDHandshake extends VMCommand {
50
51	private static final long serialVersionUID = 941583671647354717L;
52	
53	private final VirtualMachineID senderVMId_;
54	
55	public CMDHandshake(VirtualMachineID senderVMId) {
56		super("handshake");
57		senderVMId_ = senderVMId;
58	}
59	
60	public void send(CommunicationBus dispatcher, Address recipientVM) {
61		dispatcher.sendAsyncUnicast(this, recipientVM);
62	}
63	
64	public void uponReceiptBy(ELVirtualMachine remoteHost, Address senderAddress) {
65		remoteHost.vmAddressBook_.addEntry(senderVMId_, senderAddress);
66		// ask my discovery actor to send outstanding subscriptions to the newcomer
67		remoteHost.discoveryActor_.event_sendAllSubscriptionsTo(senderAddress);
68		//notify all remote references registered for the new VM.
69		remoteHost.connectionManager_.notifyConnected(senderVMId_);
70	}
71	
72}