private void addCacheListenerOnRegion(String regionName) {
    Region<Object, Object> region = cache.getRegion(regionName);
    AttributesMutator<Object, Object> mutator = region.getAttributesMutator();
    listener1 = new QueueListener<>();
    mutator.addCacheListener(listener1);
  }
Returns a Map that contains the count for number of cache server and number of Receivers.
geode-wan/src/distributedTest/java/org/apache/geode/internal/cache/wan/WANTestBase.java