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/*
 * Copyright 1999-2006 University of Chicago
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.globus.ftp.dc;

import org.globus.ftp.Session;
import org.globus.ftp.DataSink;
import org.globus.ftp.DataSource;
import org.globus.ftp.vanilla.BasicServerControlChannel;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
   Data channel receives in the constructor a socket that should
   be ready for communication, and starts a new thread that
   will perform the transfer.

   In previous version, the data channel would perform socket
   initialization (server.accept() etc.). This is now done by the
   facade's manager thread, so it can start several data channels.
 **/
public class SimpleDataChannel extends AbstractDataChannel {

    protected static Log logger =
        LogFactory.getLog(SimpleDataChannel.class.getName());

    protected SocketBox socketBox;
    protected TransferThread transferThread;
    protected TransferThreadFactory transferThreadFactory;

    /**
       @param socketBox should be opened and ready for comunication
    **/
    public SimpleDataChannel(Session session, SocketBox socketBox) {
        super(session);
        if (socketBox == null) {
            throw new IllegalArgumentException("socketBox is null");
        }
        if (socketBox.getSocket() == null) {
            throw new IllegalArgumentException("socket is null");
        }
        if (session == null) {
            throw new IllegalArgumentException("session is null");
        }
        this.socketBox = socketBox;
        this.transferThreadFactory = new SimpleTransferThreadFactory();
    }

    public void close() throws IOException {
        if (transferThread != null) {
            transferThread.interrupt();
            // wait till thread dies
            try {
                transferThread.join();
            } catch (InterruptedException e) {
            }
        }

        // thread should clean up after itself,
        // but let's check it
        socketBox.setSocket(null);
    }

    public void startTransfer(DataSink sink,
                              BasicServerControlChannel localControlChannel,
                              TransferContext context)
        throws Exception {
        transferThread =
            transferThreadFactory.getTransferSinkThread(this,
                                                        socketBox,
                                                        sink,
                                                        localControlChannel,
                                                        context);

        transferThread.start();
    }

    public void startTransfer(DataSource source,
                              BasicServerControlChannel localControlChannel,
                              TransferContext context)
        throws Exception {
        transferThread =
            transferThreadFactory.getTransferSourceThread(this,
                                                          socketBox,
                                                          source,
                                                          localControlChannel,
                                                          context);
        transferThread.start();
    }
}