| /* ActivatableRef.java -- Activatable server reference |
| Copyright (C) 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 gnu.java.rmi.server; |
| |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.rmi.Remote; |
| import java.rmi.RemoteException; |
| import java.rmi.activation.ActivationException; |
| import java.rmi.activation.ActivationID; |
| import java.rmi.server.ObjID; |
| import java.rmi.server.RMIClientSocketFactory; |
| import java.rmi.server.RemoteObject; |
| import java.rmi.server.RemoteObjectInvocationHandler; |
| import java.rmi.server.RemoteRef; |
| |
| /** |
| * The activatable reference works like UnicastRef, but if the remote object |
| * appears to be not accessible, it tries to reactivate it before reporting |
| * any errors. Apart the fields of the UnicastRef, the activatable reference |
| * contains the ActivationID that is used for this activation. |
| * |
| * @author Audrius Meskauskas (Audriusa@Bioinformatics.org) |
| */ |
| public class ActivatableRef extends UnicastRef |
| { |
| /** |
| * Use serial version UID for iteroperability |
| */ |
| private static final long serialVersionUID = 1; |
| |
| /** |
| * The activation id. |
| */ |
| ActivationID actId; |
| |
| /** |
| * Delegate call to the superclass. |
| */ |
| public ActivatableRef() |
| { |
| super(); |
| } |
| |
| /** |
| * Delegate call to the superclass. |
| */ |
| public ActivatableRef(ObjID objid, String host, int port, |
| RMIClientSocketFactory csf) |
| { |
| super(objid, host, port, csf); |
| } |
| |
| /** |
| * Delegate call to the superclass. |
| */ |
| public ActivatableRef(ObjID objid) |
| { |
| super(objid); |
| } |
| |
| /** |
| * Get the referencing class. |
| */ |
| public String getRefClass(ObjectOutput out) |
| { |
| return "ActivatableRef"; |
| } |
| |
| /** |
| * Read the content from the input stream. |
| */ |
| public void readExternal(ObjectInput in) throws IOException, |
| ClassNotFoundException |
| { |
| super.readExternal(in); |
| actId = (ActivationID) in.readObject(); |
| } |
| |
| /** |
| * Write the content to the output stream. |
| */ |
| public void writeExternal(ObjectOutput out) throws IOException |
| { |
| super.writeExternal(out); |
| out.writeObject(actId); |
| } |
| |
| /** |
| * Invoke the remote method on the given object and try to activate the object |
| * if it is not reacheable with the current manager. |
| */ |
| protected Object invokeCommon(Remote obj, Method method, Object[] params, |
| int opnum, long hash) throws Exception |
| { |
| UnicastConnection conn; |
| try |
| { |
| conn = manager.getConnection(); |
| } |
| catch (IOException e1) |
| { |
| // Connection failed: try to activate. |
| Remote reactivated = actId.activate(false); |
| |
| if (reactivated instanceof RemoteObject) |
| { |
| RemoteRef ref = ((RemoteObject) reactivated).getRef(); |
| manager = ((UnicastRef) ref).manager; |
| } |
| else if (Proxy.isProxyClass(reactivated.getClass())) |
| { |
| RemoteObjectInvocationHandler hander = |
| (RemoteObjectInvocationHandler) |
| Proxy.getInvocationHandler(reactivated); |
| |
| RemoteRef ref = hander.getRef(); |
| manager = ((UnicastRef) ref).manager; |
| } |
| else |
| throw new ActivationException("Activating into unsupported class " |
| + reactivated.getClass()); |
| |
| try |
| { |
| conn = manager.getConnection(); |
| } |
| catch (IOException e2) |
| { |
| throw new RemoteException("connection failed to host: " |
| + manager.serverName, e1); |
| } |
| } |
| return invokeCommon(conn, obj, method, params, opnum, hash); |
| } |
| } |