PageRenderTime 7ms CodeModel.GetById 1ms app.highlight 4ms RepoModel.GetById 0ms app.codeStats 1ms

/interpreter/tags/at_build150307/src/edu/vub/at/actors/net/cmd/CMDHandshake.java

http://ambienttalk.googlecode.com/
Java | 81 lines | 31 code | 8 blank | 42 comment | 0 complexity | c1480a53044ead64a3a3503f24ea61ab MD5 | raw file
 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.GUID;
31import edu.vub.at.actors.natives.ELVirtualMachine;
32import edu.vub.at.actors.net.Logging;
33
34import org.jgroups.Address;
35import org.jgroups.Message;
36import org.jgroups.SuspectedException;
37import org.jgroups.TimeoutException;
38import org.jgroups.blocks.MessageDispatcher;
39
40/**
41 * A handshake command is sent when a VM discovers another VM in its environment.
42 * It sends its own GUID to the newly discovered VM, which can then add this GUID
43 * to its VM address book.
44 *
45 * SENDER: the discovering VM
46 * RECEIVER: the discovered VM
47 * MODE: ASYNCHRONOUS, UNICAST
48 * PROPERTIES: GUID of sender
49 * REPLY: none
50 * 
51 * @author tvcutsem
52 */
53public class CMDHandshake extends VMCommand {
54
55	private final GUID senderVMId_;
56	
57	public CMDHandshake(GUID senderVMId) {
58		super("handshake");
59		senderVMId_ = senderVMId;
60	}
61	
62	public void send(MessageDispatcher dispatcher, Address recipientVM) {
63		try {
64			super.sendAsyncUnicast(dispatcher, recipientVM);
65		} catch (TimeoutException e) {
66			Logging.VirtualMachine_LOG.warn(this + ": timeout while trying to handshake, dropping");
67		} catch (SuspectedException e) {
68			Logging.VirtualMachine_LOG.warn(this + ": remote VM suspected while handshaking");
69		}
70	}
71	
72	public Object uponReceiptBy(ELVirtualMachine remoteHost, Message wrapper) throws Exception {
73		remoteHost.vmAddressBook_.addEntry(senderVMId_, wrapper.getSrc());
74		// ask my discovery actor to send outstanding subscriptions to the newcomer
75		remoteHost.discoveryActor_.event_sendAllSubscriptionsTo(wrapper.getSrc());
76		//notify all remote references registered for the new VM.
77		remoteHost.membershipNotifier_.notifyConnected(senderVMId_);
78    	return null;
79	}
80	
81}