/interpreter/tags/at2dist091109/src/edu/vub/at/actors/id/ATObjectID.java
Java | 122 lines | 53 code | 18 blank | 51 comment | 5 complexity | 26b3f71c6fba44baacc2f038a762ded5 MD5 | raw file
1/** 2 * AmbientTalk/2 Project 3 * ATObjectID.java created on 21-dec-2006 at 12:04:03 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.id; 29 30 31import edu.vub.at.actors.natives.ELActor; 32import edu.vub.at.actors.natives.ELVirtualMachine; 33import edu.vub.at.exceptions.InterpreterException; 34 35import java.io.Serializable; 36import java.util.Random; 37 38/** 39 * An ATObjectID instance represents a globally unique identifier denoting 40 * an AmbientTalk/2 object. It is represented by a triplet: 41 * - object ID (uniquely identifying an object within one actor) 42 * - actor ID (uniquely identifying an object within 43 * - virtual machine ID (uniquely identifying a virtual machine in the network) 44 * 45 * @author tvcutsem 46 */ 47public class ATObjectID implements Serializable { 48 49 private static final long serialVersionUID = -2108704271907943887L; 50 51 private static final Random generator_ = new Random(System.currentTimeMillis()); 52 53 private final VirtualMachineID virtualMachineId_; 54 private final ActorID actorId_; 55 private final long objectId_; 56 private final String description_; 57 58 /** 59 * Creates a new unique object identifier for an object that lives on the given 60 * VM and is hosted by the given actor. The description parameter is used in 61 * the printed representation of far references. 62 */ 63 public ATObjectID(VirtualMachineID vmId, ActorID actorId, String description) { 64 virtualMachineId_ = vmId; 65 actorId_ = actorId; 66 objectId_ = generator_.nextLong(); 67 description_ = description; 68 } 69 70 /* 71 * Three cases to consider: 72 * an object can be: 73 * - local to an actor (isFar -> false, isRemote -> false) 74 * - hosted by another local actor (isFar -> true, isRemote -> false) 75 * - hosted by a remote actor (isFar -> true, isRemote -> true) 76 */ 77 public boolean isFar() throws InterpreterException { 78 return (!actorId_.equals(ELActor.currentActor().getActorID())); 79 } 80 81 public boolean isRemote() { 82 return (!virtualMachineId_.equals(ELVirtualMachine.currentVM().getGUID())); 83 } 84 85 /* ----------------------- 86 * -- Structural Access -- 87 * ----------------------- */ 88 89 public ActorID getActorId() { 90 return actorId_; 91 } 92 93 public VirtualMachineID getVirtualMachineId() { 94 return virtualMachineId_; 95 } 96 97 public int hashCode() { 98 return virtualMachineId_.hashCode() | 99 actorId_.hashCode() | 100 (int) objectId_; 101 } 102 103 public boolean equals(Object other) { 104 if (other instanceof ATObjectID) { 105 ATObjectID id = (ATObjectID) other; 106 return (id.getVirtualMachineId().equals(virtualMachineId_) 107 && (id.getActorId().equals(actorId_)) 108 && (id.objectId_ == objectId_)); 109 } else { 110 return false; 111 } 112 } 113 114 public String getDescription() { 115 return description_; 116 } 117 118 public String toString() { 119 return virtualMachineId_ + "|" + actorId_ + "|" + objectId_; 120 } 121 122}