If a capability accepts a callback as a method param, such as for
subscriptions, then it seems there are (at least) two possible ways to
handle cancellation:
a) return a handle that can be dropped to cancel the subscription
interface Foo {
subscribe (callback :Callback) -> (handle :Capability);
}
or b)
fulfil the promise returned by the method call at EOF, and drop the promise
to cancel the subscription.
interface Foo {
subscribe (callback :Callback);
}
I'm curious to understand fully the pros and cons of each approach,
especially when the callback is a ByteStream, where it seems natural to
return the pumpTo promise as the result of the subscribe call's
implementation?
Cheers,
Vaci
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