/interpreter/tags/at2dist220411/src/edu/vub/at/actors/net/OBJNetwork.java
Java | 98 lines | 35 code | 11 blank | 52 comment | 1 complexity | ff1840de154d716ca04a09cd7d934c15 MD5 | raw file
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 java.util.HashMap; 31 32import edu.vub.at.actors.natives.ELVirtualMachine; 33import edu.vub.at.eval.Evaluator; 34import edu.vub.at.exceptions.InterpreterException; 35import edu.vub.at.objects.ATNil; 36import edu.vub.at.objects.ATObject; 37import edu.vub.at.objects.natives.NATByCopy; 38import edu.vub.at.objects.natives.NATText; 39import edu.vub.util.TempFieldGenerator; 40 41/** 42 * This class represents the singleton network object which 43 * provides methods to interface with AT/2's distribution layer. 44 * 45 * @author tvcutsem 46 */ 47public final class OBJNetwork extends NATByCopy { 48 49 /** 50 * The singleton instance of the network object 51 */ 52 static public final OBJNetwork _INSTANCE_ = new OBJNetwork(); 53 54 /** 55 * Constructor made private for singleton design pattern 56 */ 57 private OBJNetwork() { } 58 59 /** 60 * def online() { make the interpreter go online; return nil } 61 * After invoking this method, publications and subscriptions can interact 62 * with those of remote VMs. 63 */ 64 public ATNil base_online() { 65 ELVirtualMachine.currentVM().event_goOnline(); 66 return Evaluator.getNil(); 67 } 68 69 /** 70 * def offline() { make the interpreter go offline; return nil } 71 * Invoking this method causes remote references to become disconnected. 72 * 73 */ 74 public ATNil base_offline() { 75 ELVirtualMachine.currentVM().event_goOffline(); 76 return Evaluator.getNil(); 77 } 78 79 /** 80 * After deserialization, ensure that the network object remains unique. 81 */ 82 public ATObject meta_resolve() throws InterpreterException { 83 return OBJNetwork._INSTANCE_; 84 } 85 86 public NATText meta_print() throws InterpreterException { 87 return NATText.atValue("<native object: network>"); 88 } 89 90 public NATText impl_asCode(TempFieldGenerator objectMap) throws InterpreterException { 91 if (objectMap.contains(this)) { 92 return objectMap.getName(this); 93 } 94 NATText name = objectMap.put(this, NATText.atValue("network")); 95 return name; 96 } 97 98}