public CircularBuffer() 
{
		m_elements = new Object[256];
}

 public boolean isEmpty() 
{
	  return (m_pos==m_end);
}

 public Object pop() 
{
	  Object elem;
	  if (m_pos==m_end) return null;
	  elem = m_elements[m_pos++];
	  if (m_pos==m_elements.length &&
	  	  m_pos!=m_end) 
	  	  m_pos=0;
	  return elem;
}

 public synchronized  void push(Object elem) 
{
		
	  if (m_end==m_elements.length) {
	  	// we are full but not warped,
	  	// can we warp around?
	  	if (m_pos==0) {
 			// no... therefore just grow.
  			grow();
	  	} else {
	  		// yes, warp;
	  		m_end = 0;
	  	}
	  	m_elements[m_end++] = elem;
	  	return;
	  }	  			
	  if (m_pos< =m_end) {
	  	// we are not wrapped and we
	  	// are not full (above test)...
	    // just add the event.
	  	m_elements[m_end++] = elem;
	  	return;
	  }
	  // we are wrapped...
	  if (m_end==m_pos-1) {
  		// we are warpped and full, grow.
  		grow();
	  }
	  m_elements[m_end++] = elem;
}