// File: IO4.java
//
// Author: Rahul Simha
// Created: Nov 18, 1998
//
// Sequential Producer-consumer using a file.

import java.awt.*;
import java.awt.event.*;
import java.io.*;


class Producer extends Frame {

  Label L;     
  OutputStream out_stream;  // For the output.

  public Producer (OutputStream out_stream)
  {
    // Store the reference to the buffer.
    this.out_stream = out_stream;

    // Create the frame.
    this.setSize (600,100);
    this.setLocation (0,100);
    this.setTitle ("Producer");
    this.setBackground (Color.white);
    // this.setLayout (new BorderLayout());

    // This is where we will write to.
    L = new Label ("");
    this.add (L, BorderLayout.CENTER);

    this.setVisible (true);
  }


  // Must implement the run() method.

  public void run ()
  {
    // Write 25 random bytes to the buffer.

    for (int i=1; i<=25; i++) {
      // Create a random byte
      byte k = (byte) UniformRandom.uniform (1, 100);

      // Write to label first.
      L.setText (L.getText() + " " + k);

      // Write it to the screen.
      System.out.println ("Producer: writing " + k);

      // Write integer to buffer.
      try {
	out_stream.write (k);
      }
      catch (IOException e) { System.out.println (e); }

      // Sleep for a while.
      try {
	Thread.sleep ((int)UniformRandom.uniform(100,1000));
      }
      catch (InterruptedException e) { System.out.println (e); }
    }

    try {
      out_stream.write ((byte)-1);
    }
    catch (IOException e) { System.out.println (e); }

    L.setText (L.getText() + " Done!");
  }

}


class Consumer extends Frame {

  Label L;     
  InputStream in_stream;  // To get data from.

  public Consumer (InputStream in_stream)
  {
    this.in_stream = in_stream;

    this.setSize (600,100);
    this.setLocation (0, 200);
    this.setTitle ("Consumer");
    this.setBackground (Color.white);
    // this.setLayout (new BorderLayout());

    L = new Label ("");
    this.add (L, BorderLayout.CENTER);

    this.setVisible (true);
  }


  public void run ()
  {
    // Read byte values until EOF.

    while (true) {
      // Get the next byte
      int i = -1;
      try {
	i = in_stream.read ();
      }
      catch (IOException e) { System.out.println (e); }

      byte k = (byte) i;

      // Check if end-of-data.
      if (k < 0) break;

      System.out.println ("Consumer: just read " + k);

      // Write it on the frame.
      L.setText (L.getText() + " " + k);

      // Sleep for a while.
      try {
	Thread.sleep ((int)UniformRandom.uniform(500,1000));
      }
      catch (InterruptedException e) { System.out.println (e); }
    }

    L.setText (L.getText() + " Done!");
  }

}


// This is an independent quit button to quit the application.

class QuitButton extends Frame {

  public QuitButton ()
  {
    this.setSize (80,50);
    this.setLocation (0, 0);
    this.setTitle ("Quit button");
    Button quitb = new Button ("QUIT");
    quitb.setBackground (Color.red);
    quitb.addActionListener (
      new ActionListener () {
        public void actionPerformed (ActionEvent a)
	{
	  System.exit (0);
	}
      }
    );
    this.add (quitb, BorderLayout.CENTER);
    this.setVisible (true);
  }

}


public class IO4 {

  public static void main (String[] argv)
  {
    // Create an independent quit button.
    QuitButton q = new QuitButton ();

    try {
      // ByteArrayOutputStream buf_out = new ByteArrayOutputStream (1000);

      // Set up a temporary file.
      File f = new File ("IO4_temp");
      
      // Create an output stream for it.
      FileOutputStream file_out = new FileOutputStream (f);

      // Create a producer instance and run it.
      // Producer p = new Producer (buf_out);
      Producer p = new Producer (file_out);
      p.run();

      // Close the file so it can be read.
      file_out.close ();

      // ByteArrayInputStream buf_in = new ByteArrayInputStream (buf);
      FileInputStream file_in = new FileInputStream (f);

      // Create a consumer instance and run it.
      // Consumer c = new Consumer (buf_in);
      Consumer c = new Consumer (file_in);
      c.run();

      file_in.close ();
    }
    catch (IOException e) { System.out.println (e); }

  }

}