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/* UnicastConnection.java --

   Copyright (c) 1996, 1997, 1998, 1999, 2002, 2004

   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.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.net.Socket;

import java.rmi.RemoteException;

public class UnicastConnection

        implements Runnable, ProtocolConstants {

UnicastConnectionManager manager;

Socket sock;

DataInputStream din;

DataOutputStream dout;

ObjectInputStream oin;

ObjectOutputStream oout;

// reviveTime and expireTime make UnicastConnection pool-able

long reviveTime = 0;

long expireTime = Long.MAX_VALUE;

UnicastConnection(UnicastConnectionManager man, Socket sock) {

        this.manager = man;

        this.sock = sock;

}

void acceptConnection() throws IOException {

//System.out.println("Accepting connection on " + sock);

    //Use BufferedXXXStream would be more efficient

        din = new DataInputStream(new BufferedInputStream(sock.getInputStream()));

        dout = new DataOutputStream(new BufferedOutputStream(sock.getOutputStream()));

        int sig = din.readInt();

        if (sig != PROTOCOL_HEADER) {

                throw new IOException("bad protocol header");

        }

        short ver = din.readShort();

        if (ver != PROTOCOL_VERSION) {

                throw new IOException("bad protocol version");

        }

        int protocol = din.readUnsignedByte();

        if (protocol != SINGLE_OP_PROTOCOL) {

                // Send an ACK

                dout.writeByte(PROTOCOL_ACK);

                // Send my hostname and port

                dout.writeUTF(manager.serverName);

                dout.writeInt(manager.serverPort);

                dout.flush();

                // Read their hostname and port

                String rhost = din.readUTF();

                int rport = din.readInt();

        }

        // Okay, ready to roll ...

}

void makeConnection(int protocol) throws IOException {

    //Use BufferedXXXStream would be more efficient

        din = new DataInputStream(new BufferedInputStream(sock.getInputStream()));

        dout = new DataOutputStream(new BufferedOutputStream(sock.getOutputStream()));

        // Send header

        dout.writeInt(PROTOCOL_HEADER);

        dout.writeShort(PROTOCOL_VERSION);

        dout.writeByte(protocol);

    dout.flush();

        if (protocol != SINGLE_OP_PROTOCOL) {

                // Get back ack.

                int ack = din.readUnsignedByte();

                if (ack != PROTOCOL_ACK) {

                        throw new RemoteException("Unsupported protocol");

                }

                // Read in host and port

                String dicard_rhost = din.readUTF();

                int discard_rport = din.readInt();

                // Send them my endpoint

                dout.writeUTF(manager.serverName);

                dout.writeInt(manager.serverPort);

                dout.flush();

        }

        // Okay, ready to roll ...

}

DataInputStream getDataInputStream() throws IOException {

        return (din);

}

DataOutputStream getDataOutputStream() throws IOException {

        return (dout);

}

/*

*

* get ObjectInputStream for reading more objects

*

*/

ObjectInputStream getObjectInputStream() throws IOException {

        if (oin == null) {

                throw new IOException("no ObjectInputtream for reading more objects");

        }

        return (oin);

}

/**

*

* starts ObjectInputStream.

*

*/

ObjectInputStream startObjectInputStream() throws IOException {

        return (oin = new RMIObjectInputStream(din));

}

/**

*

* get ObjectOutputStream for sending more objects

*

*/

ObjectOutputStream getObjectOutputStream() throws IOException {

        if (oout == null) {

                throw new IOException("no ObjectOutputStream for sending more objects");

        }

        return (oout);

}

/**

*

* starts ObjectOutputStream.

*

*/

ObjectOutputStream startObjectOutputStream() throws IOException {

        return (oout = new RMIObjectOutputStream(dout));

}

void disconnect() {

        try {

            if(oout != null)

                oout.close();

        sock.close();

        }

        catch (IOException _) {

    }

        oin = null;

    oout = null;

        din = null;

        dout = null;

        sock = null;

}

public static final long CONNECTION_TIMEOUT = 10000L;

static boolean isExpired(UnicastConnection conn, long l){

    if (l <= conn.expireTime )

        return false;

    return true;

}

static void resetTime(UnicastConnection conn){

    long l = System.currentTimeMillis();

    conn.reviveTime = l;

    conn.expireTime = l + CONNECTION_TIMEOUT;

}

/**

 * We run connects on the server. Dispatch it then discard it.

 */

public void run() {

    do{

        try {

                UnicastServer.dispatch(this);

            //don't discardConnection explicitly, only when

            //  exception happens or the connection's expireTime

            //  comes

        } catch (Exception e ){

                manager.discardConnection(this);

            break;

        }

    }while(true);

}

}