/* class MemoryWin32 for IE browsers uses J/Direct to access kernel32.dll
   functions to read currently available RAM memory. Requires compilation
   with MS jvc compiler. 
                                     M. Gallant   09/17/2001 */

import java.awt.*;
import com.ms.dll.DllLib;
import com.ms.security.*;
import com.ms.wfc.util.*;

public class MemoryWin32 extends java.applet.Applet implements Runnable {
   Thread runner;
   long interval = 500 ;  // pause time in milliseconds.
   private Label l1 = new Label("Total physical  memory = -------------------------------------------- ") ;
   private Label l2 = new Label("Total available memory = -------------------------------------------- ") ;;
   protected MEMORYSTATUS mstatus;
   private int memorybar = 0; 
   private int barwidth = 300 ;
   private int barheight = 20 ;

  public void init() { 
   mstatus = new MEMORYSTATUS() ;
   add(l1) ;
   add(l2) ;
   } 


 public void start()  {
     if (runner == null)  {
     runner = new Thread(this);
     runner.start();
    }
 }


public void stop() {
   if (runner != null) {
        runner.stop();
        runner = null;
    }
 }

 
 public void pause(long time) {
            try { Thread.sleep(time);}  // wait for time milliseconds.
            catch (InterruptedException e) { }
       }



  public void run() {
    try {
      if (Class.forName("com.ms.security.PolicyEngine") != null)  // get permissions
        PolicyEngine.assertPermission(PermissionID.SYSTEM);
         while (true) {
           availMemory() ;
          pause(interval) ;
         }
      } 
     catch (Throwable cnfe) {  }

  }


 private void availMemory() {
   GlobalMemoryStatus(mstatus);
     int totmem = mstatus.dwTotalPhys ;
     int availmem = mstatus.dwAvailPhys ;
     double fract = (int)(1000.0*availmem/totmem)/10.0 ;
       l1.setText("Total physical  memory = " + Value.formatNumber(totmem/1024, 0, NumberFormat.GROUP_DIGITS) + " Kb") ;
       l2.setText("Total available  memory = " + Value.formatNumber(availmem/1024, 0, NumberFormat.GROUP_DIGITS) + " Kb   ["  + fract + " %]") ;
     memorybar = (int) (1.0*barwidth*availmem/totmem) ;
   repaint() ;
  }


public void update(Graphics g) {
  paint(g) ;
 }

 public void paint(Graphics g) {
   g.setColor(Color.black) ;
   g.drawRect(0,0,this.getSize().width-1, this.getSize().height-1) ; 
  g.setColor(Color.white) ;
   g.fillRect(20, 80, barwidth, barheight) ;
  g.setColor(Color.red) ;
   g.fillRect(20,80, memorybar, barheight) ;
  g.setColor(Color.black) ;
  g.drawRect(20, 80, barwidth, barheight) ;
  }


    /** @dll.import("KERNEL32") */
    static native void GlobalMemoryStatus(MEMORYSTATUS lptMemStat);
}


/** @dll.struct() */
class MEMORYSTATUS {

    public int dwLength = DllLib.sizeOf(MEMORYSTATUS.class);
    public int dwMemoryLoad;
    public int dwTotalPhys;
    public int dwAvailPhys;
    public int dwTotalPageFile;
    public int dwAvailPageFile;
    public int dwTotalVirtual;
    public int dwAvailVirtual;


}