gcc/libjava/gnu/java/rmi/server/UnicastServer.java

/*
  Copyright (c) 1996, 1997, 1998, 1999, 2002 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.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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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
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independent module, the terms and conditions of the license of that
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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
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exception statement from your version. */

package gnu.java.rmi.server;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.util.Hashtable;
import java.net.UnknownHostException;
import java.rmi.Remote;
import java.rmi.server.ObjID;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.server.UID;
import java.rmi.server.RemoteRef;
import java.rmi.RemoteException;
import java.rmi.NoSuchObjectException;
import gnu.java.rmi.dgc.DGCImpl;

public class UnicastServer
	implements ProtocolConstants {

static private Hashtable objects = new Hashtable();  //mapping OBJID to server ref
static private Hashtable refcache = new Hashtable(); //mapping obj itself to server ref
static private DGCImpl dgc;

public static void exportObject(UnicastServerRef obj) {
	startDGC();
	objects.put(obj.objid, obj);
	refcache.put(obj.myself, obj);
	obj.manager.startServer();
}

// FIX ME: I haven't handle force parameter
public static boolean unexportObject(UnicastServerRef obj, boolean force) {
	objects.remove(obj.objid);
	refcache.remove(obj.myself);
	obj.manager.stopServer();
	return true;
}

public static UnicastServerRef getExportedRef(Remote remote){
    return (UnicastServerRef)refcache.get(remote);
}

private static synchronized void startDGC() {
	if (dgc == null) {
		try {
			dgc = new DGCImpl();
			// Changed DGCImpl to inherit UnicastServerRef directly
			//((UnicastServerRef)dgc.getRef()).exportObject(dgc);
			dgc.exportObject(dgc);
		}
		catch (RemoteException e) {
			e.printStackTrace();
		}
	}
}

public static void dispatch(UnicastConnection conn) throws Exception {
	switch (conn.getDataInputStream().readUnsignedByte()) {
	case MESSAGE_CALL:
		incomingMessageCall(conn);
		break;
	default:
		throw new Exception("bad method type");
	}
}

private static void incomingMessageCall(UnicastConnection conn) throws IOException {
	ObjectInputStream in = conn.getObjectInputStream();

	ObjID objid = ObjID.read(in);
	int method = in.readInt();
	long hash = in.readLong();

//System.out.println("ObjID: " + objid + ", method: " + method + ", hash: " + hash);

	// Use the objid to locate the relevant UnicastServerRef
	UnicastServerRef uref = (UnicastServerRef)objects.get(objid);
	Object returnval;
	int returncode = RETURN_ACK;
	// returnval is from Method.invoke(), so we must check the return class to see
	// if it's primitive type
	Class returncls = null;
	if (uref != null) {
		try {
			// Dispatch the call to it.
			returnval = uref.incomingMessageCall(conn, method, hash);
			returncls = uref.getMethodReturnType(method, hash);
		}
		catch (Exception e) {
			returnval = e;
			returncode = RETURN_NACK;
		}
	}
	else {
		returnval = new NoSuchObjectException("");
		returncode = RETURN_NACK;
	}

	conn.getDataOutputStream().writeByte(MESSAGE_CALL_ACK);

	ObjectOutputStream out = conn.getObjectOutputStream();

	out.writeByte(returncode);
	(new UID()).write(out);
	if(returnval != null && returncls != null)
	    ((RMIObjectOutputStream)out).writeValue(returnval, returncls);
	else if (!(returnval instanceof RMIVoidValue))
	    out.writeObject(returnval);

	out.flush();
}

}