Structured Concurrency (Example 2)

structured_concurrency_example2.kt

val parentJob = launch {
    val childJob = launch {
        var count = 1
        val startTime = System.currentTimeMillis()
        var nextPrintTime = startTime
        while (count <= 5) {
            if (System.currentTimeMillis() >= nextPrintTime) {
                println("Count: $count")
                nextPrintTime += 100L
                count++
            }
        }
    }
}

delay(250)
println("Cancelling parent job")
parentJob.cancel() 

parentJob.join()
println("Parent job completed")
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OUTPUT:
Count: 1
Count: 2
Count: 3
Cancelling parent job   // cancels parentJob and hence, cancels childJob recursively
Count: 4                // childJob continues executing its code
Count: 5
Parent job completed   // parentJob completes only after childJob. (Structured Concurrency)