How to cancel/unsubscribe from coroutines Flow

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既然无缘
既然无缘 2021-02-14 03:23

I notice a strange behavior when trying to prematurely cancel from a Flow. Take a look at the following example.

This is a simple flow that emits integer values

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  •  挽巷
    挽巷 (楼主)
    2021-02-14 03:52

    I came across a workaround in this related issue

    I have replaced every single collect with a safeCollect function in my project:

    /**
     * Only proceed with the given action if the coroutine has not been cancelled.
     * Necessary because Flow.collect receives items even after coroutine was cancelled
     * https://github.com/Kotlin/kotlinx.coroutines/issues/1265
     */
    suspend inline fun  Flow.safeCollect(crossinline action: suspend (T) -> Unit) {
      collect {
        coroutineContext.ensureActive()
        action(it)
      }
    }
    

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