internal static void RefreshGroups(HazelcastInstance hazelcastInstance, string memberId, IList <string> groups)
{
MultiMap <string, string> groupsMap = hazelcastInstance.getMultiMap(SERVER_GROUPS_MULTIMAP);
ICollection <string> existing = groupsMap.get(memberId);
//JAVA TO C# CONVERTER TODO TASK: Most Java stream collectors are not converted by Java to C# Converter:
ISet <string> superfluous = existing.Where(t => !groups.Contains(t)).collect(Collectors.toSet());
//JAVA TO C# CONVERTER TODO TASK: Most Java stream collectors are not converted by Java to C# Converter:
ISet <string> missing = groups.Where(t => !existing.Contains(t)).collect(Collectors.toSet());
missing.forEach(group => groupsMap.put(memberId, group));
superfluous.forEach(group => groupsMap.remove(memberId, group));
}