001 /* ActivationDesc.java -- record with info to activate an object 002 Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.rmi.activation; 039 040 import java.io.Serializable; 041 import java.rmi.MarshalledObject; 042 043 /** 044 * Contains the information, necessary to activate the object. This information 045 * includes: 046 * <ul> 047 * <li>the object class name</li> 048 * <li>the object group identifier</li> 049 * <li>the code location (codebase URL) that can be used to load the class 050 * remotely</li> 051 * <li>the object restart mode</li> 052 * <li>the object specific intialization information</li> 053 * </ul> 054 * 055 * @author Audrius Meskauskas (audriusa@bioinformatics.org) (from stub) 056 */ 057 public final class ActivationDesc 058 implements Serializable 059 { 060 /** 061 * Use SVUID for interoperability. 062 */ 063 static final long serialVersionUID = 7455834104417690957L; 064 065 /** 066 * The group id. 067 */ 068 private ActivationGroupID groupid; 069 070 /** 071 * The class name. 072 */ 073 private String classname; 074 075 /** 076 * The code location URL. 077 */ 078 private String location; 079 080 /** 081 * The object specific intitalization data. 082 */ 083 private MarshalledObject<?> data; 084 085 /** 086 * The start mode. 087 */ 088 private boolean restart; 089 090 /** 091 * Create the new activation description, assuming the object group is the 092 * {@link ActivationGroup#currentGroupID()}. 093 * 094 * @param className the object fully qualified class name 095 * @param location the code base URL 096 * @param data the object initialization data, contained in a marshalled form 097 */ 098 public ActivationDesc(String className, String location, MarshalledObject<?> data) 099 throws ActivationException 100 { 101 this(ActivationGroup.currentGroupID(), className, location, data, false); 102 } 103 104 /** 105 * Create the new activation description, assuming the object group is the 106 * {@link ActivationGroup#currentGroupID()}. 107 * 108 * @param className the object fully qualified class name 109 * @param location the code base URL 110 * @param data the object initialization data, contained in a marshalled form 111 * @param restart specifies reactivation mode after crash. If true, the object 112 * is activated when activator is restarted or the activation group 113 * is restarted. If false, the object is only activated on demand. 114 * This flag does has no effect during the normal operation (the 115 * object is normally activated on demand). 116 */ 117 public ActivationDesc(String className, String location, 118 MarshalledObject<?> data, boolean restart) 119 throws ActivationException 120 { 121 this(ActivationGroup.currentGroupID(), className, location, data, restart); 122 } 123 124 /** 125 * Create the new activation description. Under crash, the object will only 126 * be reactivated on demand. 127 * 128 * @param groupID the object group id. 129 * @param className the object fully qualified class name 130 * @param location the code base URL 131 * @param data the object initialization data, contained in a marshalled form 132 */ 133 public ActivationDesc(ActivationGroupID groupID, String className, 134 String location, MarshalledObject<?> data) 135 { 136 this(groupID, className, location, data, false); 137 } 138 139 /** 140 * Create the new activation description, providing full information. 141 * 142 * @param groupID the object group id. 143 * @param className the object fully qualified class name 144 * @param location the code base URL 145 * @param data the object initialization data, contained in a marshalled form 146 * @param restart specifies reactivation mode after crash. If true, the object 147 * is activated when activator is restarted or the activation group 148 * is restarted. If false, the object is only activated on demand. 149 * This flag does has no effect during the normal operation (the 150 * object is normally activated on demand). 151 */ 152 public ActivationDesc(ActivationGroupID groupID, String className, 153 String location, MarshalledObject<?> data, boolean restart) 154 { 155 this.groupid = groupID; 156 this.classname = className; 157 this.location = location; 158 this.data = data; 159 this.restart = restart; 160 } 161 162 public ActivationGroupID getGroupID() 163 { 164 return groupid; 165 } 166 167 /** 168 * Get the class name of the object being activated 169 * 170 * @return the fully qualified class name of the object being activated 171 */ 172 public String getClassName() 173 { 174 return classname; 175 } 176 177 /** 178 * Get the code location URL ("codebase") of the object being activated. 179 * 180 * @return the codebase of the object being activated. 181 */ 182 public String getLocation() 183 { 184 return location; 185 } 186 187 public MarshalledObject<?> getData() 188 { 189 return data; 190 } 191 192 /** 193 * Get the object reactivation strategy after crash. 194 * 195 * @return true ir the object is activated when activator is restarted or the 196 * activation group is restarted. False if the object is only 197 * activated on demand. This flag does has no effect during the normal 198 * operation (the object is normally activated on demand). 199 */ 200 public boolean getRestartMode() 201 { 202 return restart; 203 } 204 205 /** 206 * Compare this object with another activation description for equality. 207 * 208 * @return true if all fields have the equal values, false otherwise. 209 */ 210 public boolean equals(Object obj) 211 { 212 if (obj instanceof ActivationDesc) 213 { 214 ActivationDesc that = (ActivationDesc) obj; 215 return eq(groupid, that.groupid) && 216 eq(classname, that.classname) && 217 eq(location, that.location) && 218 eq(data, that.data) 219 && restart == that.restart; 220 } 221 else 222 return false; 223 } 224 225 /** 226 * Get the hash code of this object (overridden to make the returned value 227 * consistent with .equals(..). 228 */ 229 public int hashCode() 230 { 231 return hash(groupid) ^ hash(classname) ^ 232 hash(location) ^ hash(data); 233 } 234 235 /** 236 * Get the hashcode of x or 0 if x == null. 237 */ 238 static final int hash(Object x) 239 { 240 return x == null ? 0 : x.hashCode(); 241 } 242 243 /** 244 * Compare by .equals if both a and b are not null, compare directly if at 245 * least one of them is null. 246 */ 247 static final boolean eq(Object a, Object b) 248 { 249 if (a == null || b == null) 250 return a == b; 251 else 252 return a.equals(b); 253 } 254 }