@Test
  public void testConcurrentGets() throws Throwable {

    Properties props = new Properties();
    props.setProperty(MCAST_PORT, "0");
    // props.setProperty("statistic-sample-rate", "60000");
    props.setProperty(STATISTIC_SAMPLING_ENABLED, "false");
    DistributedSystem ds = DistributedSystem.connect(props);

    String statName = "TestStats";
    String statDescription = "Tests stats";

    final String statDesc = "blah blah blah";

    StatisticsTypeFactory f = StatisticsTypeFactoryImpl.singleton();

    StatisticsType type = f.createType(statName, statDescription, new StatisticDescriptor[] {
        f.createIntGauge("stat", statDesc, "bottles of beer on the wall"),});

    final int statId = type.nameToId("stat");

    try {

      final AtomicReference<Statistics> statsRef = new AtomicReference<>();
      final CyclicBarrier beforeIncrement = new CyclicBarrier(3);
      final CyclicBarrier afterIncrement = new CyclicBarrier(3);
      Thread thread1 = new Thread("thread1") {
        @Override
        public void run() {
          try {
            while (true) {
              beforeIncrement.await();
              statsRef.get().incInt(statId, 1);
              afterIncrement.await();
            }
          } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          } catch (BrokenBarrierException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
        }
      };
      Thread thread3 = new Thread("thread1") {
        @Override
        public void run() {
          try {
            while (true) {
              beforeIncrement.await();
              afterIncrement.await();
              statsRef.get().getInt(statId);
            }
          } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          } catch (BrokenBarrierException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
        }
      };
      thread1.start();
      thread3.start();
      for (int i = 0; i < 5000; i++) {
        Statistics stats = ds.createAtomicStatistics(type, "stats");
        statsRef.set(stats);
        beforeIncrement.await();
        afterIncrement.await();
        assertEquals("On loop " + i, 1, stats.getInt(statId));
        stats.close();
      }

    } finally {
      ds.disconnect();
    }
  }
Test for bug 41340. Do two gets at the same time of a dirty stat, and make sure we get the
correct value for the stat.
geode-core/src/integrationTest/java/org/apache/geode/internal/stats50/AtomicStatsJUnitTest.java