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Diffstat (limited to 'libjava/classpath/java/rmi/activation/ActivationID.java')
| -rw-r--r-- | libjava/classpath/java/rmi/activation/ActivationID.java | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/libjava/classpath/java/rmi/activation/ActivationID.java b/libjava/classpath/java/rmi/activation/ActivationID.java new file mode 100644 index 000000000..f89a0edf8 --- /dev/null +++ b/libjava/classpath/java/rmi/activation/ActivationID.java @@ -0,0 +1,199 @@ +/* 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(); + } + +} |