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kotlinlang

you should not be implementing a disposable with a lambda

<@U0BFDUP0E>, you mean, I should create an Disposable, like this:

```emitter.setDisposable(Disposables.fromAction {
             orderReference.child(id).removeEventListener(listener)
            })```

yep. but if you're doing that you should probably just use the `setCancellable` which will handle creating that wrapper for you and allow you to use the superior lambda

<@U0BFDUP0E>, thanks, really. than I just don’t get what’s the difference between setCancellable() and setDisposable() if  we _only_ want to get a callback when this stream is unsubscribed.

cancellable is the callback, disposable is a disposable which is a more involved type that has a lifecycle and idempotency associated