flink.iso8583.example.Client.java Source code

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Here is the source code for flink.iso8583.example.Client.java

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/*
j8583 A Java implementation of the ISO8583 protocol
Copyright (C) 2007 Enrique Zamudio Lopez
    
This library 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 2.1 of the License, or (at your option) any later version.
    
This library 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 this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/
package flink.iso8583.example;

import java.io.IOException;
import java.math.BigDecimal;
import java.net.Socket;
import java.text.ParseException;
import java.util.Hashtable;
import java.util.Random;

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

import flink.iso8583.IsoMessage;
import flink.iso8583.IsoType;
import flink.iso8583.MessageFactory;
import flink.iso8583.impl.SimpleTraceGenerator;
import flink.iso8583.parse.ConfigParser;

/** Implements a very simple TCP client application that connects to a server and sends some
 * requests, displaying the response codes and confirmations.
 * 
 * @author Enrique Zamudio
 */
public class Client extends Thread {

    private static final Log log = LogFactory.getLog(Client.class);

    private static final String[] data = new String[] { "1234567890", "5432198765", "1020304050", "abcdefghij",
            "AbCdEfGhIj", "1a2b3c4d5e", "A1B2C3D4E5", "a0c0d0f0e0", "j5k4m3nh45" };
    private static final BigDecimal[] amounts = new BigDecimal[] { new BigDecimal("10"), new BigDecimal("20.50"),
            new BigDecimal("37.44") };
    private static MessageFactory mfact;
    /** This map holds the messages that are still awaiting response. Keys are traces, values are IsoMessages.*/
    private static Hashtable pending = new Hashtable();

    private Socket sock;

    public Client(Socket socket) {
        sock = socket;
    }

    public void run() {
        byte[] lenbuf = new byte[2];
        try {
            //For high volume apps you will be better off only reading the stream in one thread
            //and then using another thread to parse the buffers and process the responses
            //Otherwise the network buffer might fill up and you can miss a message.
            while (sock != null && sock.isConnected() && !isInterrupted()) {
                sock.getInputStream().read(lenbuf);
                int size = ((lenbuf[0] & 0xff) << 8) | (lenbuf[1] & 0xff);
                byte[] buf = new byte[size];
                //We're not expecting ETX in this case
                if (sock.getInputStream().read(buf) == size) {
                    try {
                        //We'll use this header length as a reference.
                        //In practice, ISO headers for any message type are the same length.
                        String respHeader = mfact.getIsoHeader(0x200);
                        IsoMessage resp = mfact.parseMessage(buf, respHeader == null ? 12 : respHeader.length());
                        log.debug("Read response " + resp.getField(11) + " conf " + resp.getField(38) + ": "
                                + new String(buf));
                        pending.remove(resp.getField(11).toString());
                    } catch (ParseException ex) {
                        log.error("Parsing response", ex);
                    }
                } else {
                    pending.clear();
                    return;
                }
            }
        } catch (IOException ex) {
            log.error("Reading responses", ex);
        } finally {
            try {
                sock.close();
            } catch (IOException ex) {
            }
            ;
        }
    }

    public static void main(String[] args) throws Exception {
        Random rng = new Random(System.currentTimeMillis());
        log.debug("Reading config");
        mfact = ConfigParser.createFromClasspathConfig("flink/iso8583/example/config.xml");
        mfact.setAssignDate(true);
        mfact.setTraceNumberGenerator(new SimpleTraceGenerator((int) (System.currentTimeMillis() % 10000)));
        log.debug("Connecting to server");
        Socket sock = new Socket("localhost", 9999);
        //Send 10 messages, then wait for the responses
        Client reader = new Client(sock);
        reader.start();
        for (int i = 0; i < 10; i++) {
            IsoMessage req = mfact.newMessage(0x200);
            req.setValue(4, amounts[rng.nextInt(amounts.length)], IsoType.AMOUNT, 0);
            req.setValue(12, req.getObjectValue(7), IsoType.TIME, 0);
            req.setValue(13, req.getObjectValue(7), IsoType.DATE4, 0);
            req.setValue(15, req.getObjectValue(7), IsoType.DATE4, 0);
            req.setValue(17, req.getObjectValue(7), IsoType.DATE4, 0);
            req.setValue(37, new Long(System.currentTimeMillis() % 1000000), IsoType.NUMERIC, 12);
            req.setValue(41, data[rng.nextInt(data.length)], IsoType.ALPHA, 16);
            req.setValue(48, data[rng.nextInt(data.length)], IsoType.LLLVAR, 0);
            pending.put(req.getField(11).toString(), req);
            log.debug("Sending request " + req.getField(11));
            req.write(sock.getOutputStream(), 2);
        }
        log.debug("Waiting for responses");
        while (pending.size() > 0 && sock.isConnected()) {
            sleep(500);
        }
        reader.interrupt();
        sock.close();
        log.debug("DONE.");
    }

}