public class RandomTester {

   private static class RunTest implements Runnable {
      int i; 
      int[] resTimes;
      volatile static int using=0;
      volatile static int waiting=0;
      volatile static long startTime=0;
      public RunTest(int i) {
	 this.i=i;
      }

      private void sleepUntil(long millis) {
        long t;
	while((t = millis-time()) > 0) 
	   mySleep(t);
      }
      private void mySleep(long millis) {
	 try {Thread.sleep(millis);}
	 catch (InterruptedException ie) {};
      }

      private long time() {return System.currentTimeMillis()-startTime;}

      private void printEvent(String desc) {
         String header = "   At " + time() + "ms\t ";
	 for(int j=0; j<i; j++) header += "  ";
	 System.out.println(header+desc);
      }
   
      public void run() {
	 while(startTime==0) mySleep(10);  // Wait for startTime to be set         
	 for(int j=0; j<10; j++) {
	    mySleep((int)(5+300*Math.random()));  // Alter these numbers for different test
	    printEvent(i + " : requests resource.  In use: " + using 
		       + "  Already waiting: " + waiting);
	    waiting++;
	    int myResource = ResManager.instances[i].getResource();
	    waiting--;                  
	    using++;
	    printEvent(i + " : using resource    " + myResource);
	    mySleep((int)(5+100*Math.random()));  // Alter these numbers for different test
	    printEvent(i + " : released resource " + myResource);
	    ResManager.instances[i].releaseResource();
	    using--;
	 }
      }
   }

  public static void main(String []args) {

     int nResources = 4;  // Alter this value for different tests
     int nInstances = 10; // Alter this value for different tests
     ResManager.init(nResources, nInstances);

     for(int i=0; i<nInstances; i++) {
        Thread t = new Thread(new RunTest(i));
        t.start();
     }
     System.out.println("Starting test.  Number of resources = " + nResources);
     RunTest.startTime=System.currentTimeMillis();  // Set the start time
  }
}