/interpreter/tags/at2dist170907/src/edu/vub/at/actors/net/OBJNetwork.java

 1/**
 2 * AmbientTalk/2 Project
 3 * OBJNetwork.java created on 24-feb-2007 at 17:38:31
 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;
29
30import edu.vub.at.actors.natives.ELVirtualMachine;
31import edu.vub.at.exceptions.InterpreterException;
32import edu.vub.at.objects.ATNil;
33import edu.vub.at.objects.ATObject;
34import edu.vub.at.objects.natives.NATByCopy;
35import edu.vub.at.objects.natives.OBJNil;
36import edu.vub.at.objects.natives.NATText;
37
38/**
39 * This class represents the singleton network object which
40 * provides methods to interface with AT/2's distribution layer.
41 *
42 * @author tvcutsem
43 */
44public final class OBJNetwork extends NATByCopy {
45	
46	/**
47	 * The singleton instance of the network object
48	 */
49	static public final OBJNetwork _INSTANCE_ = new OBJNetwork();
50	
51	/**
52	 * Constructor made private for singleton design pattern
53	 */
54	private OBJNetwork() { }
55	
56	/**
57	 * def online() { make the interpreter go online; return nil }
58	 * After invoking this method, publications and subscriptions can interact
59	 * with those of remote VMs.
60	 */
61	public ATNil base_online() {
62		ELVirtualMachine.currentVM().event_goOnline();
63		return OBJNil._INSTANCE_;
64	}
65
66	/**
67	 * def offline() { make the interpreter go offline; return nil }
68	 * Invoking this method causes remote references to become disconnected.
69	 * 
70	 */
71	public ATNil base_offline() {
72		ELVirtualMachine.currentVM().event_goOffline();
73		return OBJNil._INSTANCE_;
74	}
75	
76	/**
77	 * After deserialization, ensure that the network object remains unique.
78	 */
79	public ATObject meta_resolve() throws InterpreterException {
80		return OBJNetwork._INSTANCE_;
81	}
82	
83	public NATText meta_print() throws InterpreterException {
84		return NATText.atValue("<native object: network>");
85	}
86	
87}