# SMS and Email Notification (Scala)

```Notification.scala``` contains all the necessary implementations and a couple of missing ones.  Using Scala's ```Future```s implement the problem parts below:

* **Part 1**
  * Send notification for ```debit``` or ```credit``` transactions on a customer’s bank account.
  * Implement either ```credit``` or ```debit``` operation.
  * You must send both the messages SMS and Email upon a successful transaction.

* **Part 2**
  * Retry any service method - ```sendSms``` or ```sendEmail``` until a specified number of times.
  * Hint: For this write a generic retry method which consumes a CBN Future and returns a Future that succeeds or fails.
  * Enhance the above to now retry after every specified duration.
  * You can use the ```enableSMSAfter``` or  ```enableEmailAfter``` methods on ```NotificationService``` to test.

* **Part 3**
  * Using the earlier retry (from Part 2) caused multiple SMS’ and Email’s being sent, despite the success of intermediate future.
  * Change the behaviour of retry such that:
    * if any of the intermediate future succeeds, it stops retrying and exits.
    * if none of the futures succeeds, it retries until the specified number of times every specified duration
  * Finally, use it the ```AccountService```’s ```debit``` or ```credit``` implementation to see it in action.