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jPOS is an ISO-8583 based financial transaction library/framework that can be customized and extended in order to implement financial interchanges.

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/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2013 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */

package org.jpos.iso.channel;

import org.jpos.iso.*;

import java.io.BufferedReader;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * Extracts <isomsg> blocks from standard jPOS log
 *
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
public class LogChannel extends BaseChannel {
    BufferedReader reader = null;
    /**
     * Public constructor (used by Class.forName("...").newInstance())
     */
    public LogChannel () {
        super();
    }
    /**
     * Constructs client ISOChannel
     * @param host  server TCP Address
     * @param port  server port number
     * @param p     an ISOPackager
     * @see ISOPackager
     */
    public LogChannel (String host, int port, ISOPackager p) {
        super(host, port, p);
    }
    /**
     * Construct server ISOChannel
     * @param p     an ISOPackager
     * @see ISOPackager
     * @exception IOException
     */
    public LogChannel (ISOPackager p) throws IOException {
        super(p);
    }
    /**
     * constructs a server ISOChannel associated with a Server Socket
     * @param p     an ISOPackager
     * @param serverSocket where to accept a connection
     * @exception IOException
     * @see ISOPackager
     */
    public LogChannel (ISOPackager p, ServerSocket serverSocket) 
        throws IOException
    {
        super(p, serverSocket);
    }
    /**
     * @return a byte array with the received message
     * @exception IOException
     */
    protected byte[] streamReceive() throws IOException {
        StringBuilder sb = new StringBuilder();
        boolean inMsg = false;
        while (reader != null) {
            String s = reader.readLine();
            if (s == null)
                throw new EOFException();
            if (s.indexOf ("= 0)
                inMsg = true;
            if (inMsg) 
                sb.append (s);
            if (s.indexOf ("") >= 0)
                break;
        }
        return sb.toString().getBytes();
    }
    protected int getHeaderLength() { 
        return 0; 
    }
    protected void connect (Socket socket) throws IOException {
        super.connect (socket);
        reader = new BufferedReader (new InputStreamReader (serverIn));
    }
    public void disconnect () throws IOException {
        super.disconnect ();
        reader = null;
    }
}