Since the `onCompletion` argument of `produce` is marked int kotlinlang #coroutines

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Title

j

Jonathan

10/30/2018, 4:20 PM

Since the

onCompletion

argument of

produce

is marked internal api, and it is not possible to

CoroutineStart.ATOMIC

with

produce

, how can one make sure a given resource is always released?

d

dave08

10/30/2018, 4:40 PM

Inside the produce scope, there's

invokeOnClose()

, isn't that for cleaning up resources?

j

Jonathan

10/30/2018, 4:40 PM

But the lambda of produce may not start at all...

(if is cancelled too quickly)

d

dave08

10/30/2018, 4:41 PM

Don't you initialize the resources inside the lambda?

j

Jonathan

10/30/2018, 4:42 PM

Whenever I can yes. But it is not always possible

For instance if I want to build an operator for channel. The operator has to receive an existing channel, and we have to make sure that the given channel is always consumed.

d

dave08

10/30/2018, 5:13 PM

Isn't that why all the operators in the library are using

consume { }

?

e

elizarov

10/30/2018, 6:09 PM

But why you cannot start it

ATOMIC

j

Jonathan

10/31/2018, 8:01 AM

@elizarov

produce

dooesn't have a

start

argument. Does it?

@dave08 yes, that's why all operators in kotlinx.coroutines do

onCompletion = consumes()

. But this is internal API

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