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/*
 * Copyright (C) 2006-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see .
 */

package org.filesys.oncrpc;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Enumeration;
import java.util.Hashtable;

import org.filesys.debug.Debug;
import org.filesys.server.NetworkServer;
import org.filesys.server.PacketHandlerInterface;
import org.filesys.server.SocketSessionHandler;


/**
 * TCP RPC Session Handler Class
 *
 * Receives session requests via a TCP socketRPC requests via a datagram and passes the request to the registered RPC server.
 *
 * @author gkspencer
 */
public class TcpRpcSessionHandler extends SocketSessionHandler {

    //	RPC server implementation that handles the RPC processing
    private RpcProcessor m_rpcProcessor;

    //	Maximum request size allowed
    private int m_maxRpcSize;

    //	List of active sessions
    private Hashtable m_sessions;

    /**
     * Class constructor
     *
     * @param name      String
     * @param protocol  String
     * @param rpcServer RpcProcessor
     * @param server    NetworkServer
     * @param addr      InetAddress
     * @param port      int
     * @param maxSize   int
     */
    public TcpRpcSessionHandler(String name, String protocol, RpcProcessor rpcServer, NetworkServer server,
                                InetAddress addr, int port, int maxSize) {
        super(name, protocol, server, addr, port);

        //	Set the RPC server implementation that will handle the actual requests
        m_rpcProcessor = rpcServer;

        //	Set the maximum RPC request size allowed
        m_maxRpcSize = maxSize;

        //	Create the active session list
        m_sessions = new Hashtable();
    }

    /**
     * Return the maximum RPC size allowed
     *
     * @return int
     */
    protected int getMaximumRpcSize() {
        return m_maxRpcSize;
    }

    /**
     * Return the RPC server used to process the requests
     *
     * @return RpcProcessor
     */
    protected final RpcProcessor getRpcProcessor() {
        return m_rpcProcessor;
    }

    /**
     * Accept an incoming session request
     *
     * @param sock Socket
     */
    protected void acceptConnection(Socket sock) {

        try {

            //	Set the socket for no delay
            sock.setTcpNoDelay(true);

            //	Create a packet handler for the new session and add to the active session list
            int sessId = getNextSessionId();
            TcpRpcPacketHandler pktHandler = createPacketHandler(sessId, sock);

            //	Add the packet handler to the active session table
            m_sessions.put(new Integer(sessId), pktHandler);

            //	DEBUG
            if (Debug.EnableInfo && hasDebug())
                Debug.println("[" + getProtocolName() + "] Created new session id = " + sessId + ", from = " + sock.getInetAddress().getHostAddress() + ":" + sock.getPort());
        }
        catch (IOException ex) {
        }
    }

    /**
     * Remove a session from the active session list
     *
     * @param sessId int
     */
    protected final void closeSession(int sessId) {

        //	Remove the specified session from the active session table
        PacketHandlerInterface pktHandler = m_sessions.remove(new Integer(sessId));
        if (pktHandler != null) {

            //	Close the session
            pktHandler.closePacketHandler();
        }
    }

    /**
     * Close the session handler, close all active sessions.
     *
     * @param server NetworkServer
     */
    public void closeSessionHandler(NetworkServer server) {
        super.closeSessionHandler(server);

        //	Close all active sessions
        if (m_sessions.size() > 0) {

            //	Enumerate the sessions
            Enumeration enm = m_sessions.elements();

            while (enm.hasMoreElements()) {

                //	Get the current packet handler
                PacketHandlerInterface handler = enm.nextElement();
                handler.closePacketHandler();
            }

            //	Clear the session list
            m_sessions.clear();
        }
    }

    /**
     * Create a packet handler for a new session
     *
     * @param sessId int
     * @param sock   Socket
     * @return TcpRpcPacketHandler
     * @exception IOException Socket error
     */
    protected TcpRpcPacketHandler createPacketHandler(int sessId, Socket sock)
            throws IOException {

        //	Create a single threaded TCP RPC packet handler
        return new TcpRpcPacketHandler(this, sessId, m_rpcProcessor, sock, getMaximumRpcSize());
    }
}