private void doNextPuts(String regionName, int start, int numPuts) {
    Region<Integer, Integer> region = getCache().getRegion(regionName);
    for (int i = start; i < numPuts; i++) {
      region.put(i, i);
    }
  }
Regression test for TRAC #50366: NullPointerException with AsyncEventQueue#size() when number
of dispatchers is more than 1
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/wan/asyncqueue/ConcurrentAsyncEventListenerDistributedTest.java