Construct for async actions that don't produce values

[ldaley]

We have Promise for asynchronously produced single value, and Publisher for multi values. We are missing a construct for an async action that produces no values.

Options:

1. We go with Promise
2. ExecControl.nest(Block someAction, Block then)
3. Introduce AsyncAction, which is like Promise, but no operations

For 2, the caller of the action would have to no it was async and act accordingly (i.e. no type safety).

For 3, the implementor has to return the code, instead of just doing it. That’s a bit of a pain. In that respect, it’s no different to 1 though.

[niwinz]

In my opinion, the Promise<Void> should be used. Having different types for the same purpose but with different value (or absense of value) does not have benefits, but having only one type, has the benefit that the user should not think about different kind of types.

[ldaley]

The big downside to the Promise<Void> approach though is that you have null flying all over the place. It is looking like the most promising option though at this point.

[danhyun]

Is this not addressed via Operation now?

[ldaley]

It is, but the class needs some docs.

On 15 Jun 2015, at 05:54, Danny notifications@github.com wrote:

Is this not addressed via Operation now?

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[danhyun]

Got it, I can tackle tonight.