How to use

getMembers

method

in

brooklyn.entity.basic.DynamicGroup

@Override
protected void preStart() {
  String reverse = getConfig(REVERSE_LOOKUP_NETWORK);
  if (Strings.isBlank(reverse)) reverse = getAttribute(ADDRESS);
  setAttribute(REVERSE_LOOKUP_CIDR, new Cidr(reverse + "/24"));
  String reverseLookupDomain = Joiner.on('.').join(Iterables.skip(Lists.reverse(Lists.newArrayList(Splitter.on('.').split(reverse))), 1)) + ".in-addr.arpa";
  setAttribute(REVERSE_LOOKUP_DOMAIN, reverseLookupDomain);
  Map<?, ?> flags = MutableMap.builder()
      .put("name", "Address tracker")
      .put("sensorsToTrack", ImmutableSet.of(getConfig(HOSTNAME_SENSOR)))
      .build();
  policy = new AbstractMembershipTrackingPolicy(flags) {
    @Override
    protected void onEntityChange(Entity member) { added(member); }
    @Override
    protected void onEntityAdded(Entity member) {
      if (Strings.isNonBlank(member.getAttribute(getConfig(HOSTNAME_SENSOR)))) added(member); // Ignore, unless hostname set
    }
    @Override
    protected void onEntityRemoved(Entity member) { removed(member); }
  };
  // For any entities that have already come up
  for (Entity member : entities.getMembers()) {
    if (Strings.isNonBlank(member.getAttribute(getConfig(HOSTNAME_SENSOR)))) added(member); // Ignore, unless hostname set
  }
  addPolicy(policy);
  policy.setGroup(entities);
}