private void valuesChangedForInterface(String interfaceName, long[] keys) {
for (int i = 0; i < listenToChangesConnections.size(); i++) {
WrappedSocketConnection connection = listenToChangesConnections.get(i);
try {
connection.writeString(interfaceName);
connection.writeInt(keys.length);
for (Long key : keys) {
connection.writeLong(key);
}
connection.flush();
long response = connection.readLong();