kotlin 协程。作用域的取消，兄弟协程的取消，协程取消会异常

Posted 2022-06-13 安果移不动

 作用域的取消

   private fun testScopeCancel() = runBlocking<Unit> 
        val scope = CoroutineScope(Dispatchers.Default)
        scope.launch 
            delay(1000)
            Log.e(TAG, "job1 finish")
        
        scope.launch 
            delay(1000)
            Log.e(TAG, "job2 finish")
        
        delay(100)
        scope.cancel()
    

整个协程都会被取消，

 

如果我们想仅仅取消部分协程呢？

    private fun testBrotherScopeCancel() = runBlocking<Unit> 
        val scope = CoroutineScope(Dispatchers.Default)
        val job1 = scope.launch 
            delay(1000)
            Log.e(TAG, "job1 finish")
        
        val job2 = scope.launch 
            delay(1000)
            Log.e(TAG, "job2 finish")
        
        delay(100)

        job1.cancel()
        Log.e(TAG, "协程的作用域要被取消啦")
    

 

job是可以取消的，同理作用域也可以进行取消操作。

    private fun cancelilationExcepiton() = runBlocking 
        val job1 = GlobalScope.launch 
            try 
                delay(1100)
                Log.e(TAG, "job1 finish")
             catch (e: Exception) 
                e.printStackTrace()
            
        
        delay(100)
        job1.cancel(CancellationException("取消"))
        job1.join()