transactionserver.java

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/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.io.*;
import java.util.*;
import java.net.*;

public class TransactionServer implements Runnable {
  protected Hashtable tags;
  protected InputStream in;
  protected OutputStream out;
  
  public TransactionServer (InputStream in, OutputStream out) {
    this.in = in;
    this.out = out;
    tags = new Hashtable ();
  }

  public void run () {
    MessageInputStream messageIn = new MessageInputStream (in);
    MessageOutputStream messageOut = new MessageOutputStream (out);
    try {
      while (true) {
        messageIn.receive ();
        Thread.sleep (1000);
        String cmd = messageIn.readUTF ();
        System.out.println (Thread.currentThread () + ": command " + cmd);
        if (cmd.equals ("get")) {
          doGet (messageIn, messageOut);
          messageOut.send ();
        } else if (cmd.equals ("put")) {
          doPut (messageIn);
        }
      }
    } catch (IOException ex) {
      ex.printStackTrace ();
    } catch (InterruptedException ignored) {
    }
  }

  void doGet (DataInputStream dataIn, DataOutputStream dataOut) throws IOException {
    String attr = dataIn.readUTF ();
    dataOut.writeUTF (attr);
    if (tags.containsKey (attr))
      dataOut.writeUTF ((String) tags.get (attr));
    else
      dataOut.writeUTF ("null");
  }

  void doPut (DataInputStream dataIn) throws IOException {
    String attr = dataIn.readUTF ();
    String value = dataIn.readUTF ();
    tags.put (attr, value);
  }

  public static void main (String[] args) throws IOException {
    if (args.length != 2)
      throw new IllegalArgumentException
        ("Syntax: TransactionServer <port> <threads>");
    ServerSocket server = new ServerSocket (Integer.parseInt (args[0]));
    Socket socket = server.accept ();
    server.close ();
    InputStream in = socket.getInputStream ();
    OutputStream out = socket.getOutputStream ();
    TransactionServer transactionServer = new TransactionServer (in, out);
    int n = Integer.parseInt (args[1]);
    for (int i = 0; i < n; ++ i)
      new Thread (transactionServer).start ();
  }
}