1 /* DefaultActivationGroup.java -- Default activation group. 2 Copyright (C) 2006 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.java.rmi.activation; 40 41 import gnu.java.rmi.server.ActivatableServerRef; 42 import gnu.java.rmi.server.UnicastServer; 43 44 import java.lang.reflect.Constructor; 45 import java.rmi.MarshalledObject; 46 import java.rmi.Remote; 47 import java.rmi.RemoteException; 48 import java.rmi.activation.ActivationDesc; 49 import java.rmi.activation.ActivationException; 50 import java.rmi.activation.ActivationGroup; 51 import java.rmi.activation.ActivationGroupID; 52 import java.rmi.activation.ActivationID; 53 import java.rmi.activation.UnknownObjectException; 54 55 /** 56 * The default activation group class. This activation group assumes that 57 * all classes are accessible via current thread context class loader. 58 * The remote class loading is not supported for security reasons. The 59 * activation always occurs in the current jre. 60 * 61 * @author Audrius Meskauskas (audriusa@Bioinformatics.org) 62 */ 63 public class DefaultActivationGroup 64 extends ActivationGroup 65 { 66 /** 67 * Use the serialVersionUID for interoperability. 68 */ 69 private static final long serialVersionUID = 1; 70 71 /** 72 * Used during the group creation (required constructor). 73 */ 74 static final Class[] cConstructorTypes = new Class[] 75 { 76 ActivationID.class, 77 MarshalledObject.class 78 }; 79 80 81 /** 82 * Create the new default activation group. 83 * 84 * @param id the group activation id. 85 * @param data may contain the group initialization data (unused and can be 86 * null) 87 * @throws RemoteException if the super constructor does 88 */ DefaultActivationGroup(ActivationGroupID id, MarshalledObject data)89 public DefaultActivationGroup(ActivationGroupID id, MarshalledObject data) 90 throws RemoteException 91 { 92 super(id); 93 } 94 95 96 /** 97 * May be overridden and used as a hook. This method is called each time 98 * the new object is instantiated. 99 */ activeObject(ActivationID id, Remote obj)100 public void activeObject(ActivationID id, Remote obj) 101 throws ActivationException, UnknownObjectException, RemoteException 102 { 103 // Nothing to do (the monitor is already notified in newInstance) 104 } 105 106 /** 107 * Create the new instance of the object, using the class name and location 108 * information, stored in the passed descriptor. The method expects the object 109 * class to have the two parameter constructor, the first parameter being the 110 * {@link ActivationID} and the second the {@link MarshalledObject}. 111 * 112 * @param id the object activation id 113 * @param desc the activation descriptor, providing the information, necessary 114 * to create and activate the object 115 * @return the marshalled object, containing the exported stub of the created 116 * object 117 * @throws ActivationException if the activation fails due any reason 118 */ newInstance(ActivationID id, ActivationDesc desc)119 public MarshalledObject newInstance(ActivationID id, ActivationDesc desc) 120 throws ActivationException, RemoteException 121 { 122 try 123 { 124 if (ActivationSystemTransient.debug) 125 System.out.println("Instantiating "+desc.getClassName()); 126 127 Remote object; 128 Class objectClass; 129 130 ClassLoader loader = Thread.currentThread().getContextClassLoader(); 131 objectClass = loader.loadClass(desc.getClassName()); 132 Constructor constructor = objectClass.getConstructor(cConstructorTypes); 133 object = (Remote) constructor.newInstance( 134 new Object[] { id, desc.getData() }); 135 136 // Make the object accessible and create the stub. 137 ActivatableServerRef ref = UnicastServer.getActivatableRef(id); 138 Remote stub = ref.exportObject(object); 139 140 MarshalledObject marsh = new MarshalledObject(stub); 141 142 // Notify the activation monitor. 143 activeObject(id, marsh); 144 145 // Make call to the hook that may be overridden. 146 activeObject(id, stub); 147 148 return marsh; 149 } 150 catch (Exception e) 151 { 152 ActivationException acex = new ActivationException( 153 "Unable to activate "+ desc.getClassName() 154 + " from "+ desc.getLocation(), e); 155 throw acex; 156 } 157 } 158 159 } 160