// Fig. 16.15: CircularBufferTest.java
// CircularBufferTest shows two threads manipulating a circular buffer.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

// set up the producer and consumer threads and start them
public class CircularBufferTest extends JFrame {
   JTextArea outputArea;

   // set up GUI
   public CircularBufferTest()
   {
      super( "Demonstrating Thread Synchronizaton" );
        
      outputArea = new JTextArea( 20,30 );
      outputArea.setFont( new Font( "Monospaced", Font.PLAIN, 12 ) );
      getContentPane().add( new JScrollPane( outputArea ) );
        
      setSize( 310, 500 );
      setVisible( true );
        
      // create shared object used by threads; we use a CircularBuffer
      // reference rather than a Buffer reference so we can invoke 
      // CircularBuffer method createStateOutput
      CircularBuffer sharedLocation = new CircularBuffer( outputArea );

      // display initial state of buffers in CircularBuffer
      SwingUtilities.invokeLater( new RunnableOutput( outputArea, 
         sharedLocation.createStateOutput() ) );

      // set up threads
      Producer producer = new Producer( sharedLocation, outputArea );
      Consumer consumer = new Consumer( sharedLocation, outputArea );
        
      producer.start();  // start producer thread
      consumer.start();  // start consumer thread

   } // end constructor
    
   public static void main ( String args[] )
   {
      CircularBufferTest application = new CircularBufferTest();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

} // end class CirclularBufferTest


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