// File: Getter.java
// T Balls : Nov 2001
// Class that implements an object that extracts integers
// from a Store object

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

/**
 * A threaded object that removes integers from a Store object. 
 * After successfully retrieving an object, the thread sleeps for a variable
 * time in the range 1-10 seconds
 */
public class Getter extends JPanel implements Runnable
{
   /**
     * Constructor
     */
   public Getter( Store theStoreToUse )
   {
      theStore = theStoreToUse;

      setLayout( new BorderLayout() );
      log = new Log( 30, 20 );
      add( log, BorderLayout.CENTER );
      add( runToggle, BorderLayout.SOUTH );

      runToggle.addActionListener( new ActionListener() {
         public void actionPerformed( ActionEvent e )
         {
            if( running )
            {
               running = false;
               runToggle.setText( "Run" );
            }
            else
            {
               running = true;
               runToggle.setText( "Stop" ); 
               getRunner.interrupt();
            }
         }
      });


      getRunner = new Thread( this, "Getter" );
      running = false;
      getRunner.start();
   }

   private Store theStore;
   private JButton runToggle = new JButton( "Run" );
   private Log log;
   private Thread getRunner;
   private boolean running;
   private Random randomGenerator = new Random();

  /**
     *   The main method of the thread.
     *
     *   Implements the "run-control" and the sleep period
     */
   public void run()
   {
      while( true )
      {
         if( !running )
         {
            synchronized( this )
            {
               while( !running )
               {
                  try
                  {
                     wait();
                  }
                  catch( InterruptedException ie )
                  {
                  }
               }
            }
         }
         log.append( "Get a value from the store: " );
         int value = theStore.get();
         log.append( "" + value + "\n" );
         int pause = 1 + randomGenerator.nextInt( 9 );
         log.append( "Sleep for " + pause + " seconds\n" );
         try
         {
            getRunner.sleep( 1000*pause );
         }
         catch( InterruptedException ie2 )
         {}

      }
   }

}