Retry

Jobs will only be retried by default, you will have to specify a retry count in JobBuilder.

.retry(limit: .limited(5)) // Limit to 5 retry
.retry(limit: .unlimited) // Retry until cancel

SwiftQueue will invoke your implementation of onRetry with the current error encountered. If the error is due to a constraint like DeadlineError or TaskAlreadyExist. onError will NOT be called since there is no way for you to retry.

func onRetry(error: Error) -> RetryConstraint {
    if error is RetryAble {
        // Retry after a certain delay in Seconds
        return RetryConstraint.delay(0)
        // You can also specify an exponential back-off
        return RetryConstraint.exponential(initial: 1)
    } else {
        // No retry, onRemoved will be called
        return RetryConstraint.cancel
    }
}