RxJava2: Alternative to Observable<Void>

Question

I have an API which returns only error/success codes, with no body. With RxJava1 I would have used Observable<Void> as the return value for this call.

What can I use for RxJava2? The hint on the Wiki for RxJava2 (link) is not helpful, since I can't change how the API works.

Setup:

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'

Raffarty

Have you actually tried to use Observable<Void> ? I use RxJava 2 and Observable<Void>, did not have a single problem. – Heterogamete

Observable of Void sends a terminal event, I think. – Hobbs

https://mcmap.net/q/545674/-handle-empty-response-with-retrofit-and-rxjava-2-x – Goliath

Answer 1

Use Completable.

If the operation succeeds, it will emit a successful termination event. If it fails, you can use your own Exception subclass to wrap the necessary error codes.

Restrain

Answer 2

You can still use an Observable but replace the Void type with an enum type which is defined like this

public enum Terminal {
    TERMINAL
}

and then use it like this

Observable<Terminal>

PS: You can name the enum anything you want

Dunlop