@Override
    public int getCachedSize() throws CannotCalculateSizeException {
        // Approximate the size of the object in bytes by calculating the size of each field.
        int size = 0;
        size += CacheSizes.sizeOfObject(); // overhead of object
        size += CacheSizes.sizeOfObject() + nodeID.length;
        size += CacheSizes.sizeOfAnything(handler);
        size += CacheSizes.sizeOfCollection(receivers);
        return size;
    }
List of JIDs with the TO value of the directed presences.
E.g.: paul@js.com or room1@conference.js.com
xmppserver/src/main/java/org/jivesoftware/openfire/handler/DirectedPresence.java