279 lines
8 KiB
Java
279 lines
8 KiB
Java
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/* UnicastRef.java --
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Copyright (c) 1996, 1997, 1998, 1999, 2002, 2005
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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 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.Remote;
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import java.rmi.RemoteException;
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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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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 constructor
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*/
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// must be public otherwise java.rmi.RemoteObject cannot instantiate this class
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// -- iP
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public UnicastRef() {
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}
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public UnicastRef(ObjID objid, String host, int port, RMIClientSocketFactory csf) {
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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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this.objid = objid;
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}
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public Object invoke(Remote obj, Method method, Object[] params, long opnum) throws Exception {
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// Check if client and server are in the same VM, then local call can be 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 different
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// classloader --iP
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if(svrobj != null && method.getDeclaringClass().isInstance(svrobj)){
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//local call
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Object ret = null;
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try{
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ret = method.invoke(svrobj, params);
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}catch(InvocationTargetException e){
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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: " + ret + "\n\n");
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return ret;
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}
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//System.out.println("***************** remote call:" + manager.serverPort);
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return (invokeCommon(obj, method, params, -1, opnum));
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}
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private Object invokeCommon(Remote obj, Method method, Object[] params, int opnum, long hash) throws Exception {
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UnicastConnection conn;
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try {
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conn = manager.getConnection();
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}
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catch (IOException e1) {
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throw new RemoteException("connection failed to host: " + 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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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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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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din = conn.getDataInputStream();
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if ((returncode = din.readUnsignedByte()) != MESSAGE_CALL_ACK) {
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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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returnval = in.readObject(); // get Exception
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} else if(cls == Void.TYPE) {
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returnval = null;
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// in.readObject() // not required! returntype 'void' means no field is returned.
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} else {
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returnval = ((RMIObjectInputStream)in).readValue(cls); // get returnvalue
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}
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} catch (IOException e3) {
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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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/* if DGCAck is necessary??
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//According to RMI wire protocol, send a DGCAck
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// to indicate receiving return value
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dout.writeByte(MESSAGE_DGCACK);
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ack.write(dout);
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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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if (returncode == RETURN_NACK) throw (Exception)returnval;
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else 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, long hash) throws RemoteException {
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UnicastConnection conn;
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try {
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conn = manager.getConnection();
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}
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catch (IOException e1) {
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throw new RemoteException("connection failed to host: " + 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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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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UnicastRemoteCall c = (UnicastRemoteCall)call;
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try{
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c.done();
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} catch(IOException e){}
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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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if (manager == null) {
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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, ClassNotFoundException {
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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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throw new IOException("no ack found");
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}
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}
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public boolean remoteEquals(RemoteRef ref) {
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throw new Error("Not implemented");
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}
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public int remoteHashCode() {
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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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return ("UnicastRef");
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}
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public String remoteToString() {
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throw new Error("Not implemented");
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}
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public void dump(UnicastConnection conn) {
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try {
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DataInputStream din = conn.getDataInputStream();
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for (;;) {
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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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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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