| /* ActivationID.java -- the object activation identifier |
| Copyright (c) 1996, 1997, 1998, 1999, 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.rmi.activation; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| import java.rmi.Remote; |
| import java.rmi.RemoteException; |
| import java.rmi.server.UID; |
| |
| /** |
| * Denotes the object that can be activated over time. The instance of the |
| * ActivationID for the given object can be obtained in the following ways: |
| * <ul> |
| * <li>via {@link Activatable#register(ActivationDesc)}</li> |
| * <li>via Activatable constructor</li> |
| * <li>via Activatable.exportObject |
| * <li> |
| * </ul> |
| * An instance of the ActivationID has the {@link UID} as its component and |
| * hence is globally unique. |
| * |
| * @author Audrius Meskauskas (audriusa@bioinformatics.org) (from stub) |
| */ |
| public class ActivationID |
| implements Serializable |
| { |
| /** |
| * Use SVUID for interoperability. |
| */ |
| static final long serialVersionUID = - 4608673054848209235L; |
| |
| /** |
| * The activator. |
| */ |
| transient Activator activator; |
| |
| /** |
| * The UID, making this instance unique. |
| */ |
| transient UID uid; |
| |
| /** |
| * The activation group that has activated the object with this |
| * activation id. The field is filled in inside the group and is used |
| * to notify the group about the request to inactivated the object. |
| */ |
| transient ActivationGroup group; |
| |
| /** |
| * Create a new instance with the given activator. |
| * |
| * @param an_activator tha activator that should activate the object. |
| */ |
| public ActivationID(Activator an_activator) |
| { |
| activator = an_activator; |
| uid = new UID(); |
| } |
| |
| /** |
| * Activate the object. |
| * |
| * @param force if true, always contact the group. Otherwise, the cached value |
| * may be returned. |
| * @return the activated object |
| * @throws UnknownObjectException if the object is unknown |
| * @throws ActivationException if the activation has failed |
| * @throws RemoteException if the remote call has failed |
| */ |
| public Remote activate(boolean force) throws ActivationException, |
| UnknownObjectException, RemoteException |
| { |
| try |
| { |
| return (Remote) activator.activate(this, force).get(); |
| } |
| catch (IOException e) |
| { |
| ActivationException acex = new ActivationException("id "+uid, e); |
| throw acex; |
| } |
| catch (ClassNotFoundException e) |
| { |
| ActivationException acex = new ActivationException("id "+uid, e); |
| throw acex; |
| } |
| } |
| |
| /** |
| * Returns the hash code of the activator. |
| */ |
| public int hashCode() |
| { |
| return uid == null ? 0 : uid.hashCode(); |
| } |
| |
| /** |
| * Compares the activators for equality. |
| */ |
| public boolean equals(Object obj) |
| { |
| if (obj instanceof ActivationID) |
| { |
| ActivationID that = (ActivationID) obj; |
| return eq(uid, that.uid); |
| } |
| else |
| return false; |
| } |
| |
| /** |
| * Read the object from the input stream. |
| * |
| * @param in the stream to read from |
| * |
| * @throws IOException if thrown by the stream |
| * @throws ClassNotFoundException |
| */ |
| private void readObject(ObjectInputStream in) throws IOException, |
| ClassNotFoundException |
| { |
| uid = (UID) in.readObject(); |
| activator = (Activator) in.readObject(); |
| } |
| |
| /** |
| * Write the object to the output stream. |
| * |
| * @param out the stream to write int |
| * @throws IOException if thrown by the stream |
| * @throws ClassNotFoundException |
| */ |
| private void writeObject(ObjectOutputStream out) throws IOException, |
| ClassNotFoundException |
| { |
| out.writeObject(uid); |
| out.writeObject(activator); |
| }; |
| |
| /** |
| * Compare by .equals if both a and b are not null, compare directly if at |
| * least one of them is null. |
| */ |
| static final boolean eq(Object a, Object b) |
| { |
| if (a == null || b == null) |
| return a == b; |
| else |
| return a.equals(b); |
| } |
| |
| /** |
| * Return the content based string representation. |
| */ |
| public String toString() |
| { |
| return uid.toString(); |
| } |
| |
| } |