mirror of git://gcc.gnu.org/git/gcc.git
525 lines
14 KiB
Java
525 lines
14 KiB
Java
/* UnicastRef.java --
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Copyright (c) 1996, 1997, 1998, 1999, 2002, 2005, 2006
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.rmi.server;
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import gnu.java.rmi.dgc.LeaseRenewingTask;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.io.ObjectInput;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutput;
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import java.io.ObjectOutputStream;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.rmi.ConnectException;
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import java.rmi.Remote;
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import java.rmi.RemoteException;
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import java.rmi.dgc.Lease;
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import java.rmi.server.ObjID;
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import java.rmi.server.Operation;
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import java.rmi.server.RMIClientSocketFactory;
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import java.rmi.server.RemoteCall;
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import java.rmi.server.RemoteObject;
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import java.rmi.server.RemoteRef;
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import java.rmi.server.UID;
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public class UnicastRef
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implements RemoteRef, ProtocolConstants
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{
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/**
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* Use serial version UID for iteroperability
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*/
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private static final long serialVersionUID = 1;
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public ObjID objid;
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UnicastConnectionManager manager;
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/**
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* Used by serialization, and let subclass capable of having default
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* constructor
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*/
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// must be public otherwise java.rmi.RemoteObject cannot instantiate this
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// class
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// -- iP
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public UnicastRef()
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{
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}
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public UnicastRef(ObjID objid, String host, int port,
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RMIClientSocketFactory csf)
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{
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this(objid);
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manager = UnicastConnectionManager.getInstance(host, port, csf);
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}
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public UnicastRef(ObjID objid)
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{
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this.objid = objid;
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}
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public Object invoke(Remote obj, Method method, Object[] params, long opnum)
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throws Exception
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{
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// Check if client and server are in the same VM, then local call can be
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// used to
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// replace remote call, but it's somewhat violating remote semantic.
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Object svrobj = manager.serverobj;
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// Make sure that the server object is compatible. It could be loaded from a
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// different
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// classloader --iP
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if (svrobj != null && method.getDeclaringClass().isInstance(svrobj))
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{
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// local call
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Object ret = null;
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try
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{
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ret = method.invoke(svrobj, params);
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}
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catch (InvocationTargetException e)
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{
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throw (Exception) e.getTargetException();
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}
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// System.out.println("\n\n ***** local call: " + method + "\nreturn: "
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// + ret + "\n\n");
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return ret;
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}
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// System.out.println("***************** remote call:" +
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// manager.serverPort);
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return (invokeCommon(obj, method, params, - 1, opnum));
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}
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/**
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* The ordinary number of the DGC messages.
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*/
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static long dgcSequence;
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/**
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* The DGC object id, also serves as a synchronization target to increment the
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* dgcSequence safely.
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*/
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static final ObjID dgcId = new ObjID(ObjID.DGC_ID);
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ObjID[] this_id;
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/**
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* The number of the method "dirty" in the DGC.
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*/
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static int DIRTY = 1;
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/**
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* The DGC interface hash code.
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*/
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static final long dgcInterfaceHash = - 669196253586618813L;
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/**
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* Notify the DGC of the remote side that we still hold this object.
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*/
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public Lease notifyDGC(Lease lease) throws Exception
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{
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long seq;
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synchronized (dgcId)
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{
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seq = dgcSequence++;
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}
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if (this_id == null)
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this_id = new ObjID[] { objid };
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UnicastConnection conn;
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try
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{
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conn = manager.getConnection();
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}
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catch (IOException e1)
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{
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throw new RemoteException("connection failed to host: "
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+ manager.serverName, e1);
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}
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ObjectOutputStream out;
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DataOutputStream dout;
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try
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{
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dout = conn.getDataOutputStream();
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dout.writeByte(MESSAGE_CALL);
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out = conn.startObjectOutputStream(); // (re)start ObjectOutputStream
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dgcId.write(out);
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// The number of the operation is 1 ("dirty")
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out.writeInt(DIRTY);
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out.writeLong(dgcInterfaceHash);
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RMIObjectOutputStream rout = (RMIObjectOutputStream) out;
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rout.writeValue(this_id, this_id.getClass());
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rout.writeLong(seq);
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rout.writeValue(lease, lease.getClass());
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out.flush();
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}
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catch (IOException e2)
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{
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throw new RemoteException("DGC call failed: ", e2);
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}
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int returncode;
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Object returnval;
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DataInputStream din;
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ObjectInputStream in;
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UID ack;
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try
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{
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din = conn.getDataInputStream();
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if ((returncode = din.readUnsignedByte()) != MESSAGE_CALL_ACK)
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{
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conn.disconnect();
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throw new RemoteException("DGC Call not acked:" + returncode);
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}
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in = conn.startObjectInputStream(); // (re)start ObjectInputStream
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returncode = in.readUnsignedByte();
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ack = UID.read(in);
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if (returncode == RETURN_NACK)
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{
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returnval = in.readObject(); // get Exception
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}
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else
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{
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returnval = ((RMIObjectInputStream) in).readValue(Lease.class);
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}
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}
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catch (IOException e3)
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{
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throw new RemoteException("DGC call return failed: ", e3);
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}
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manager.discardConnection(conn);
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if (returncode != RETURN_ACK && returnval != null)
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{
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if (returncode == RETURN_NACK)
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throw (Exception) returnval;
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else
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throw new RemoteException("DGC unexpected returncode: " + returncode);
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}
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return (Lease) returnval;
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}
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/**
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* Invoke the remote method on the given object. This part is overridden by
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* the activatable objects.
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*/
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protected Object invokeCommon(Remote obj, Method method, Object[] params,
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int opnum, long hash) throws Exception
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{
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UnicastConnection conn;
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try
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{
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conn = manager.getConnection();
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return invokeCommon(conn, obj, method, params, opnum, hash);
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}
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catch (IOException e1)
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{
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throw new RemoteException("connection failed to host: "
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+ manager.serverName, e1);
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}
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}
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/**
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* Invoke the remote method on the given object when connection is already
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* established.
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*/
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protected Object invokeCommon(UnicastConnection conn, Remote obj,
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Method method, Object[] params, int opnum,
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long hash) throws Exception
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{
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ObjectOutputStream out;
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DataOutputStream dout;
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try
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{
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dout = conn.getDataOutputStream();
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dout.writeByte(MESSAGE_CALL);
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out = conn.startObjectOutputStream(); // (re)start ObjectOutputStream
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objid.write(out);
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out.writeInt(opnum);
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out.writeLong(hash);
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// must handle primitive class and their wrapper classes
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Class clss[] = method.getParameterTypes();
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for (int i = 0; i < clss.length; i++)
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((RMIObjectOutputStream) out).writeValue(params[i], clss[i]);
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out.flush();
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}
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catch (IOException e2)
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{
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throw new RemoteException("call failed: ", e2);
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}
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int returncode;
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Object returnval;
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DataInputStream din;
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ObjectInputStream in;
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UID ack;
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try
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{
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din = conn.getDataInputStream();
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if ((returncode = din.readUnsignedByte()) != MESSAGE_CALL_ACK)
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{
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conn.disconnect();
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throw new RemoteException("Call not acked:" + returncode);
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}
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in = conn.startObjectInputStream(); // (re)start ObjectInputStream
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returncode = in.readUnsignedByte();
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ack = UID.read(in);
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Class cls = method.getReturnType();
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if (returncode == RETURN_NACK)
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{
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returnval = in.readObject(); // get Exception
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}
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else if (cls == Void.TYPE)
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{
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returnval = null;
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// in.readObject() // not required! returntype 'void' means no field
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// is returned.
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}
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else
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{
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returnval = ((RMIObjectInputStream) in).readValue(cls); // get
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// returnvalue
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}
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}
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catch (IOException e3)
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{
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// for debug: e3.printStackTrace();
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throw new RemoteException("call return failed: ", e3);
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}
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/*
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* if DGCAck is necessary?? //According to RMI wire protocol, send a DGCAck //
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* to indicate receiving return value dout.writeByte(MESSAGE_DGCACK);
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* ack.write(dout); out.flush();
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*/
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manager.discardConnection(conn);
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if (returncode != RETURN_ACK && returnval != null)
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{
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if (returncode == RETURN_NACK)
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throw (Exception) returnval;
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else
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throw new RemoteException("unexpected returncode: " + returncode);
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}
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return (returnval);
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}
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/**
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* @deprecated
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*/
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public RemoteCall newCall(RemoteObject obj, Operation[] op, int opnum,
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long hash) throws RemoteException
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{
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UnicastConnection conn;
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try
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{
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conn = manager.getConnection();
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}
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catch (IOException e1)
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{
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throw new ConnectException("connection failed to host: "
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+ manager.serverName, e1);
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}
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// obj: useless?
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return (new UnicastRemoteCall(conn, objid, opnum, hash));
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}
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/**
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* @deprecated
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*/
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public void invoke(RemoteCall call) throws Exception
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{
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UnicastRemoteCall c = (UnicastRemoteCall) call;
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call.executeCall();
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}
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/**
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* @deprecated
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*/
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public void done(RemoteCall call) throws RemoteException
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{
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UnicastRemoteCall c = (UnicastRemoteCall) call;
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try
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{
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c.done();
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}
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catch (IOException e)
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{
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}
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UnicastConnection conn = c.getConnection();
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manager.discardConnection(conn);
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}
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public void writeExternal(ObjectOutput out) throws IOException
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{
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if (manager == null)
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{
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throw new IOException("no connection");
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}
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manager.write(out);
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objid.write(out);
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// This byte is somewhat confusing when interoperating with JDK
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out.writeByte(0); // RETURN_ACK);
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}
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public void readExternal(ObjectInput in) throws IOException,
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ClassNotFoundException
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{
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manager = UnicastConnectionManager.read(in);
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objid = ObjID.read(in);
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byte ack = in.readByte();
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// This byte is somewhat confusing when interoperating with JDK
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if (ack != RETURN_ACK && ack != 0/* jdk ack value */)
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{
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throw new IOException("no ack found");
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}
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// Notify the DGC of the remote side that we hold the reference to the
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// received object. Do not notify if the client and server are on the
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// same virtual machine.
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if (manager.serverobj == null)
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LeaseRenewingTask.scheduleLeases(this);
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}
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public boolean remoteEquals(RemoteRef ref)
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{
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throw new Error("Not implemented");
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}
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public int remoteHashCode()
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{
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throw new Error("Not implemented");
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}
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public String getRefClass(ObjectOutput out)
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{
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return ("UnicastRef");
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}
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/**
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* Return the string representing the remote reference information.
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*/
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public String remoteToString()
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{
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if (manager!=null)
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return manager.toString();
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else
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return "null manager";
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}
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public void dump(UnicastConnection conn)
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{
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try
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{
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DataInputStream din = conn.getDataInputStream();
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for (;;)
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{
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int b = din.readUnsignedByte();
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System.out.print(Integer.toHexString(b));
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if (b >= 32 && b < 128)
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{
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System.out.print(": " + (char) b);
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}
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System.out.println();
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}
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}
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catch (IOException _)
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{
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}
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}
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/**
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* Check if this UnicastRef points to the object as the passed UnicastRef.
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* Both the object Id and manager must be the same.
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*
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* @return true if the passed reference points to the same remote object as
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* this reference, false otherwise.
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*/
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public boolean equals(Object other)
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{
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if (other instanceof UnicastRef)
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{
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UnicastRef r = (UnicastRef) other;
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return r.manager.equals(manager) && r.objid.equals(objid);
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}
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else
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return false;
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}
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/**
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* Get the hash code of this UnicastRef, combining hash code of the manager
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* with hash code of the object id.
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*/
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public int hashCode()
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{
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return manager.hashCode() ^ objid.hashCode();
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}
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}
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