public void run() {
            try {
                barrier.await();
            } catch (Exception e) {
                e.printStackTrace();
            }
            state = DoubleCheckedInt.getState();
        }
This class demonstrates that threads accessing the STATE variable always see a consistent value. 

During ongoing initialization the observed value is either ONGOING_INITIALIZATION
or one of {SUCCESS, FAILURE}. 

Post initialization the observed value is always one of  {SUCCESS, FAILURE}.

See also http://jira.qos.ch/browse/SLF4J-167 

@author ceki
slf4j-api/src/test/java/org/slf4j/basicTests/DoubleCheckedInt.java