Kotlin - coroutinebuilder

CoroutineBuilder

Pending functions need to be passed to each other Continuation, Each pending function is called by another pending function , All this starts with the collaboration builder . Every coroutine constructor is CoroutineScope The extension function of , And inherited its coutineContext To automatically propagate its context elements and cancellability .

• lunch()： There is no need to generate values . Return to one Job example Used to manage the life cycle of the collaborative process . abnormal ？？？
• async()： Need to generate value . Return to one Deferred example adopt await() Get the results of the execution （ Including exceptions ）. abnormal ？？？

Parameters context： Specify the collaboration context . Parameters start： Specify the startup mode of the collaboration , The default is the state that can be dispatched immediately . Parameters block： Co process actuator , That is, the task to be done .
lunch()	public fun CoroutineScope.launch(     context: CoroutineContext = EmptyCoroutineContext,     start: CoroutineStart = CoroutineStart.DEFAULT,     block: suspend CoroutineScope.() -> Unit ): Job Return the reference to the collaboration task , namely Job Anonymous implementation of interface .
async()	public fun <T> CoroutineScope.async(     context: CoroutineContext = EmptyCoroutineContext,     start: CoroutineStart = CoroutineStart.DEFAULT,     block: suspend CoroutineScope.() -> T ): Deferred<T>  Return the execution result of the collaboration , adopt await() You can get the execution result of the cooperation process .