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Title
r

rcd27

03/02/2023, 3:04 PM
I have 2 flows, one of them is cold, another is hot. The goal is to
merge
them, and collect all values they produce(and complete them all when the resulting flow completes). Issue: no items emitted, when hot one is idle. What is the nice way to combine two flows, making the resulting one - cold? where: • banEvents: MutableStateFlow • chatMessagesOutput: Flow
image.png
c

CLOVIS

03/02/2023, 3:29 PM
r

rcd27

03/02/2023, 3:30 PM
I mean all values from both without any order
c

CLOVIS

03/02/2023, 3:30 PM
Then you can use the second link
r

rcd27

03/02/2023, 3:33 PM
I've tried that out at first place, but my Turbine tests fails after using that operator. Says "no values produced in 10s"(our timeout for flow testing)
c

CLOVIS

03/02/2023, 3:33 PM
You can add
.onEach { println("some message: $it") }
to both of your flows (before the merge) to check that they do emit values
onEach
prints whatever goes through the flow without impacting it
r

rcd27

03/02/2023, 3:34 PM
Yes, Ivan, that's the point, the StateFlow emits nothing in this particular case
k

Kevin Worth

03/02/2023, 3:36 PM
From the screen shot, is
chatMessages
the
StateFlow
?
r

rcd27

03/02/2023, 3:36 PM
@Kevin Worth no, it is cold
Flow
k

Kevin Worth

03/02/2023, 3:37 PM
banEvents
, then?
r

rcd27

03/02/2023, 3:37 PM
yes
banEvents with
filterNotNull
becomes
Flow
as well
Let's do this one: I'll write some tests using different cases and then return here with my results
k

Kevin Worth

03/02/2023, 3:40 PM
And
filterNotNull().onEach { println(it) }
prints nothing? Are you sure there’s an
emit
somewhere on
banEvents
?
r

rcd27

03/02/2023, 3:40 PM
Seems like I'm missing something
@Kevin Worth that's the case! It is IDLE, so nothing emitted there.
Is it MUST that it emits?
k

Kevin Worth

03/02/2023, 3:41 PM
I think it would help to see more of the code, to try to get to an answer.
r

rcd27

03/02/2023, 3:50 PM
OK, guys, seems like the resulting flow (after
merge
) just never completes, that's why I'm catching the error in Turbine test(yes, I still receive chat messages, no bans since they are null)