kotlin-coroutines-stories-09-operator-class-no-operations.kt

class Operator: CoroutineScope {

    companion object {
        const val OPERATION_IS_EVEN = "Operation [Is Even]"
        const val OPERATION_AVERAGE = "Operation [Average]"
        const val OPERATION_SQUARE = "Operation [Square]"
    }

    private val job = SupervisorJob()
    private val exceptionHandler = CoroutineExceptionHandler { _, exception ->
        log("Exception Handler Caught: [ $exception ] with suppressed ${exception.suppressed.contentToString()}")
    }
    override val coroutineContext: CoroutineContext
        get() = job + Dispatchers.Default + exceptionHandler

    private suspend fun myRandomNumberSuccess(operation: String): Int = withContext(Dispatchers.Default) {
        log("$operation Retrieving random number...")
        delay(2000) //Simulating a heavy computation
        val random = (1..100).random()
        log("$operation Random Number = $random")
        random
    }

    private suspend fun myRandomNumberFail(operation: String): Int = withContext(Dispatchers.Default) {
        log("$operation Retrieving random number...")
        delay(1000) //Simulating a heavy computation
        throw IllegalStateException("$operation Retrieving random number failed.")
    }

    fun release() {
        this.job.cancel()
    }

}