code: public void setActive(boolean active) {
          super.setActive(active);
          if (active) {
              this.start = new AtomicLong(System.currentTimeMillis());
          } else {
              this.start =new AtomicLong( -1);
          }
      }
docs: /* (non-Javadoc)
  @see de.csc.xaresource.sample.watchdog.ITimeoutCondition#setActive(boolean)