public void RecommendAFriend(int referrerId, NewAccount friendsAccountDetails)
{
Validate(friendsAccountDetails);
// most technologies have similar transaction APIs
using (var transaction = new System.Transactions.TransactionScope())
{
try
{
// customerDirectory is a domain repository
var referrer = customerDirectory.Find(referrerId);
var friend = customerDirectory.Add(friendsAccountDetails);
// referAFriend policy is a domain policy
referAFriendPolicy.Apply(referrer, friend);
transaction.Complete();
// log here to keep to avoid cluttering domain
logger.Debug("Successful friend recommendation");
StatsdClient.Metrics.Counter("friendReferrals");
}
catch (ReferralRejectedDueToLongTermOutstandingBalance ex)
{
logger.Error(ex);
StatsdClient.Metrics.Counter("ReferralRejected");
throw new ApplicationError(
"Sorry, this referral cannot be completed. The referrer " +
"currently has an outstanding balance. Please contact " +
"customer support"
);
// transaction will roll back if Complete() not called
}
}
}
public void RecommendAFriend(int referrerId, NewAccount friendsAccountDetails)
{
Validate(friendsAccountDetails);
using (var transaction = new System.Transactions.TransactionScope())
{
try
{
var referrer = customerDirectory.Find(referrerId);
var friend = customerDirectory.Add(friendsAccountDetails);
referAFriendPolicy.Apply(referrer, friend);
transaction.Complete();
var msg = new CustomerRegisteredViaReferralPolicy
{
ReferrerId = referrerId,
FriendId = friend.Id
};
bus.Publish(msg);
}
catch (ReferralRejectedDueToLongTermOutstandingBalance)
{
var msg = new ReferralSignupRejected
{
ReferrerId = referrerId,
FriendEmail = friendsAccountDetails.Email,
Reason = "Referrer has long term outstanding balance"
};
bus.Publish(msg);
}
}
}
// all infrastructure concerns handled by framework
public ActionResult Index(int referrerId, NewAccount friend)
{
var referrer = directory.Find(referrerId);
var newAcct = directory.Create(friend);
policy.Apply(referrer, newAcct);
return(View());
}
public async void ReferAFriend(int referrerId, NewAccount friend)
{
// ...
var referrer = await directory.Find(referrerId);
var newAcct = await directory.Create(friend);
policy.Apply(referrer, newAcct);
// ...
}