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Groovy++ pattern for listeners
abstract static class Listener<T> {
abstract void call(T oldValue, T newValue)
private FList<Listener<T>> listeners = FList.emptyList
final Listener<T> addListener(Listener<T> listener, Executor executor = null) {
if(executor) {
def myListener = listener
listener = { oldValue, newValue ->
executor.execute {
myListener(oldValue, newValue)
for(;;) {
def old = listeners
if(listeners.compareAndSet(old, old + listener))
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