How to perform cascade queries?

[equinoxel]

I've got a situation where I need to log in and then fetch useful data. Unfortunately, the login is via a form and the site times out pretty fast. Therefore, I'd need to perform two (or more) calls in sequence (i.e. make sure the login call finished before executing the second one). So far I came with 2 variants:

1. enqueue the second call from within the onResponse() of the first one
2. Use Observables with map()

Is there an advised approach for this?

PS: Also on SO.

[JakeWharton]

Questions on StackOverflow do not need duplicated here. The issue tracker is for bug reports and feature requests. I will try to answer on the linked question later (if no one has beaten me to it).

[equinoxel]

True. Thought it could have some relevance to documentation as an interesting use case.

[JakeWharton]

Fair. I need to start tracking documentation improvements as issues.

[jaumard]

Interesting is this too, with parallel requests also, it will be nice to have something included in retrofit for this :)

For now for multiple cascading request I use an asynTask and make all retrofit call synchronous in it.
For two request you can do it in the OnResponse method but more will be ugly.

[JakeWharton]

The gist is that you use RxJava or ListenableFuture or CompletableFuture as
your mechanism of composition and control over the parallel/serial
execution. Retrofit itself won't be providing higher-level APIs for this,
but that also doesn't prevent you from executing Calls in parallel or
serially either, there's just a bit of manual bookkeeping.

On Mon, Mar 14, 2016, 11:28 AM Jaumard notifications@github.com wrote:

Interesting is this too, with parallel requests also, it will be nice to
have something included in retrofit for this :)

For now for multiple cascading request I use an asynTask and make all
retrofit call synchronous in it.
For two request you can do it in the OnResponse method but more will be
ugly.

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[jiangecho]

@JakeWharton Sorry to trouble you. And I am facing the same situation, I need to make two serial requests. You mentioned we can use RxJava or ListenableFuture or CompletableFuture to implement this mechanism. But I still can not figure out the solution, could you kindly give us a sample. Thank you very much.