public void clear() throws IllegalStateException {
  if (open)   throw new IllegalStateException();
  if (log.isInfoEnabled())   log.info("");
  queue.clear();
}

public void clear ( ) throws IllegalStateException { if ( open ) throw new IllegalStateException ( ) ; if ( log . isInfoEnabled ( ) ) log . info ( "" ) ; queue . clear ( ) ; }
clear the backing queue .
