Kotlin协程打印日志查看当前的线程和协程

kotlin文档经常有用到Thread.currentThread().name，打印当前的线程和协程，但是自己测试只能看到线程信息。

fun log(msg: String) = println("[${Thread.currentThread().name}] $msg")

fun simple(): Flow<Int> = flow {
    log("Started simple flow")
    for (i in 1..3) {
        emit(i)
    }
}

fun main() = runBlocking {
    simple().collect { value -> log("Collected $value") }
}

输出：

[main] Started simple flow
[main] Collected 1
[main] Collected 2
[main] Collected 3

需要在as的VM options中配置-Dkotlinx.coroutines.debug才能看到

image.png image.png

配置后输出：

[main @coroutine#1] Started simple flow
[main @coroutine#1] Collected 1
[main @coroutine#1] Collected 2
[main @coroutine#1] Collected 3