Collection that notifies listeners of a change

Hello,

I am trying to build an implementation of the Set interface that notifies registered handlers when a modification occurs on the Set.

First of all, has this already been done somewhere? 

I couldn't find anything, so I went on to build my own. The issue I have is that, when the Change event is fired, the handlers are not notified.

My code is as follows:

public class NotifyingSet<T> extends Composite implements HasCollectionChangeHandlers<T>, Set<T> {

    private final Set<T> wrappedSet;

    public NotifyingSet() {

        this.wrappedSet = new HashSet<T>();

    }

    @Override

    public boolean add(final T e) {

        final boolean ret = this.wrappedSet.add(e);

        this.fireEvent(new CollectionChangeEvent<T>(Operation.ADD, e));

        return ret;

    }

   ...

}

--------------------

public interface HasCollectionChangeHandlers<T> {

    HandlerRegistration addCollectionChangeHandler(CollectionChangeEventHandler<T> handler);

}

-------------------

In my presenter, I do this:

// Also tried with GWT.create()

private final NotifyingSet<FightRequest> fightRequests = new NotifyingSet<FightRequest>();

this.registerHandler(this.fightRequests

                .addCollectionChangeHandler(new CollectionChangeEventHandler<FightRequest>() {

                    @Override

                    public void onCollectionChange(final FightRequest element,

                            final com.fiveorbs.client.events.CollectionChangeEventHandler.Operation operation) {

                        logger.info("on collection change")

                    }

                }));

... 

fightRequests.add(someobject);

----------------

After the add, I would expect my handler to be called, but to no avail.

Would you have any idea as to what I'm doing wrong?

Thanks,

-- 

Sébastien Tromp

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