unicastref.java

kaffe是一个java虚拟机的源代码。里面包含了一些java例程和标准的java包。

/*
 * Copyright (c) 1996, 1997, 1998, 1999
 *      Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license-lesser.terms" for information on usage and 
 * redistribution of this file.
 */

package kaffe.rmi.server;

import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.RemoteRef;
import java.rmi.server.RMISocketFactory;
import java.rmi.server.RMIClientSocketFactory;
import java.rmi.server.RMIServerSocketFactory;
import java.rmi.server.RemoteObject;
import java.rmi.server.RemoteCall;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.server.Operation;
import java.rmi.server.ObjID;
import java.rmi.server.UID;
import java.lang.reflect.Method;
import java.io.ObjectOutput;
import java.io.ObjectInput;
import java.io.IOException;
import java.net.Socket;
import java.net.InetAddress;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;

public class UnicastRef
	implements RemoteRef, ProtocolConstants {

public ObjID objid;
UnicastConnectionManager manager;

/**
 * Used by serialization.
 */
private UnicastRef() {
}

public UnicastRef(ObjID objid, String host, int port, RMIClientSocketFactory csf) {
	this(objid);
	manager = UnicastConnectionManager.getInstance(host, port, csf);
}

public UnicastRef(ObjID objid) {
	this.objid = objid;
}

public Object invoke(Remote obj, Method method, Object[] params, long opnum) throws Exception {
	return (invokeCommon(obj, method, params, -1, opnum));
}

private Object invokeCommon(Remote obj, Method method, Object[] params, int opnum, long hash) throws Exception {
	UnicastConnection conn;
	try {
		conn = manager.getConnection();
	}
	catch (IOException e1) {
		throw new RemoteException("connection failed to host: " + manager.serverName, e1);
	}

	ObjectOutputStream out;
	DataOutputStream dout;
	try {
		dout = conn.getDataOutputStream();
		dout.writeByte(MESSAGE_CALL);

		out = conn.getObjectOutputStream();
		
		objid.write(out);
		out.writeInt(opnum);
		out.writeLong(hash);
		if (params != null) {
			for (int i = 0; i < params.length; i++) {
				if (params[i] instanceof UnicastRemoteObject) {
					out.writeObject(UnicastRemoteObject.exportObject((UnicastRemoteObject)params[i]));
				}
				else {
					out.writeObject(params[i]);
				}
			}
		}

		out.flush();
	}
	catch (IOException e2) {
		throw new RemoteException("call failed: ", e2);
	}

	int returncode;
	Object returnval;
	DataInputStream din;
	ObjectInputStream in;
	UID ack;
	try {
		din = conn.getDataInputStream();
		if (din.readUnsignedByte() != MESSAGE_CALL_ACK) {
			throw new RemoteException("Call not acked");
		}

		in = conn.getObjectInputStream();

		returncode = in.readUnsignedByte();
		ack = UID.read(in);
		returnval = in.readObject();
	}
	catch (IOException e3) {
		throw new RemoteException("call return failed: ", e3);
	}

	manager.discardConnection(conn);

	if (returncode != RETURN_ACK) {
		throw (Exception)returnval;
	}

	return (returnval);
}

/**
 * @deprecated
 */
public RemoteCall newCall(RemoteObject obj, Operation[] op, int opnum, long hash) throws RemoteException {
	return (new UnicastRemoteCall(obj, opnum, hash));
}

/**
 * @deprecated
 */
public void invoke(RemoteCall call) throws Exception {
	UnicastRemoteCall c = (UnicastRemoteCall)call;
	Object ret = invokeCommon((Remote)c.getObject(), (Method)null, c.getArguments(), c.getOpnum(), c.getHash());
	c.setReturnValue(ret);
}

/**
 * @deprecated
 */
public void done(RemoteCall call) throws RemoteException {
	/* Does nothing */
}

public void writeExternal(ObjectOutput out) throws IOException {
	if (manager == null) {
		throw new IOException("no connection");
	}
	manager.write(out);
	objid.write(out);
	out.writeByte(RETURN_ACK);
}

public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
	manager = UnicastConnectionManager.read(in);
	objid = ObjID.read(in);
	if (in.readByte() != RETURN_ACK) {
		throw new IOException("no ack found");
	}
}

public boolean remoteEquals(RemoteRef ref) {
	throw new kaffe.util.NotImplemented();
}

public int remoteHashCode() {
	throw new kaffe.util.NotImplemented();
}

public String getRefClass(ObjectOutput out) {
	return ("UnicastRef");
}

public String remoteToString() {
	throw new kaffe.util.NotImplemented();
}

public void dump(UnicastConnection conn) {
	try {
		DataInputStream din = conn.getDataInputStream();
		for (;;) {
			int b = din.readUnsignedByte();
			System.out.print(Integer.toHexString(b));
			if (b >= 32 && b < 128) {
				System.out.print(": " + (char)b);
			}
			System.out.println();
		}
	}
	catch (IOException _) {
	}
}

}