WM REST: worker constructor and worker

wm1.kt

class PostToServerWorker(appContext: Context, workerParams: WorkerParameters)
  : CoroutineWorker(appContext, workerParams) {

    private val random by lazy { Random(Date().time)}

    override suspend fun doWork(): Result {
        // Read input data
        val jobDuration = inputData.getInt(JOB_TIME, 100)
        val jobSuccessRate = inputData.getInt(JOB_SUCCESS_CHANCE, 0)
        val maxAttempts = inputData.getInt(ATTEMPT_RETRIES, 5)

        log("Starting job", maxAttempts)

        //Fake some work with progress
        setProgress(workDataOf(Progress to 0))
        for (i in 1..10) {
            // Simulate work
            delay((jobDuration / 10).toLong())
            setProgress(workDataOf(Progress to i * 10))
        }

        // Add a random fail
        if (random.nextInt(100) > jobSuccessRate) {
            // Get number of attempts made against max attempts we have set
            if (runAttemptCount <= maxAttempts) {
                // Try again
                log("Retrying job", maxAttempts)
                return  Result.retry()
            }
            log("Failing job", maxAttempts)
            return Result.failure()
        }

        // Return the output
        log("Finishing successful job", maxAttempts)
        return Result.success()
    }