@Override
		public List<Map<String, String>> get() {
			Set<Member> members = hazelcastInstance.getCluster().getMembers();
			List<Map<String, String>> regionNames = new ArrayList<>();

			for (Member member : members) {
				if (member.getAttributes().containsKey(REGION_ATTR_KEY)) {
					Map<String, String> regionMap = new HashMap<>();
					regionMap.put(REGION_ATTR_KEY, member.getAttributes().get(REGION_ATTR_KEY));
					regionMap.put(SUBREGION_ATTR_KEY, member.getAttributes().get(SUBREGION_ATTR_KEY));
					regionNames.add(regionMap);
				}
			}

			return regionNames;
		}
Region service class. This class responsible to keep the status of available regions.

@since 3.1
ngrinder-controller/src/main/java/org/ngrinder/region/service/RegionService.java