/// <summary>
/// Called by the WCF service when an attempt is made to notify everyone of a notification event
/// Tracks an outgoing SNC notification attempt to subscribers in the database
/// </summary>
/// <param name="notificationEvent"></param>
public int CreateNotification(string publisher, string notificationEvent, string message)
{
// Insert a notification record
using (var db = new XanoSNCEntities())
{
// Lookup the notification event by name
var notificationEventDB = (from ne in db.xNotificationEvents
where ne.Name == notificationEvent
select ne).SingleOrDefault();
if (notificationEventDB == null)
throw new Exception("Notification by name: " + notificationEvent + " does not exist");
var publisherDB = (from p in db.xPublishers
where p.Name == publisher
select p).SingleOrDefault();
if (publisherDB == null)
throw new Exception("Publisher by name: " + publisher + " does not exist");
var notification = new xNotification()
{
NotificationEventId = notificationEventDB.Id,
PublisherId = publisherDB.Id,
Message = message,
CreatedDate = DateTime.Now,
};
db.xNotifications.Add(notification);
db.SaveChanges();
return notification.Id;
}
}
/// <summary>
/// Stores a new notification type in the database
/// </summary>
/// <param name="publisher"></param>
/// <param name="notificationEvent"></param>
/// <param name="jsonSchema">json Schema for the notification message that will be sent to subscribers</param>
/// <returns>A token that the publisher must use in subsequent calls to NotifySubscribers</returns>
public string CreateNotificationEvent(string publisher, string notificationEvent, string jsonSchema)
{
using (var db = new XanoSNCEntities())
{
var publisherId = 0;
var xPublisher = (from p in db.xPublishers
where p.Name == publisher
select p).SingleOrDefault();
if (xPublisher == null)
{
var newPublisher = new xPublisher()
{
Name = publisher,
CreatedDate = DateTime.Now
};
db.xPublishers.Add(newPublisher);
publisherId = newPublisher.Id;
}
else
{
publisherId = xPublisher.Id;
}
var token = Guid.NewGuid().ToString();
var xNotificationEvent = (from ne in db.xNotificationEvents
where ne.Name == notificationEvent
select ne).SingleOrDefault();
if (xNotificationEvent == null)
{
db.xNotificationEvents.Add(new xNotificationEvent()
{
Name = notificationEvent,
PublisherId = publisherId,
JsonSchema = jsonSchema,
Token = token,
CreatedDate = DateTime.Now
});
}
else
{
throw new Exception("Notification: " + notificationEvent + " already exists.");
}
db.SaveChanges();
return token;
}
}
public void UpdateSubscriptionNotificationWithError(int subscriptionNotificationId, string errorMessage)
{
using (var db = new XanoSNCEntities())
{
var xSubscriptionNotification = (from s in db.xSubscriptionNotifications
where s.Id == subscriptionNotificationId
select s).Single();
xSubscriptionNotification.NotificationError = errorMessage;
db.SaveChanges();
}
}
/// <summary>
/// Updates the Json schema associated with an existing notification event defined by the token
/// </summary>
/// <param name="token"></param>
/// <param name="jsonSchemaString"></param>
public void UpdateNotificationEventJsonSchema(
string token,
string jsonSchemaString)
{
using (var db = new XanoSNCEntities())
{
var notificationEvent = (from ne in db.xNotificationEvents
where ne.Token == token
select ne).SingleOrDefault();
if (notificationEvent != null)
{
throw new Exception("No notification event found with token: " + token);
}
else
{
notificationEvent.JsonSchema = jsonSchemaString;
db.SaveChanges();
}
}
}
/// <summary>
/// Removes a service subscription to a notification in the database
/// </summary>
/// <param name="subscriber"></param>
/// <param name="notificationEvent"></param>
/// <param name="token">A token issued by the subscribe method</param>
public void Unsubscribe(string subscriber, string notificationEvent, string token)
{
using (var db = new XanoSNCEntities())
{
var xNotificationEvent = (from ne in db.xNotificationEvents
where ne.Name == notificationEvent
select ne).SingleOrDefault();
if (xNotificationEvent == null)
{
throw new Exception("Notification event with name: " + notificationEvent + " has not been published.");
}
var xSubscriber = (from s in db.xSubscribers
where s.Name == subscriber
select s).SingleOrDefault();
if (xSubscriber == null)
{
throw new Exception("No subscriber with name: " + subscriber + " found.");
}
var xSubscriptionDB = (from sc in db.xSubscriptions
join sb in db.xSubscribers on sc.SubscriberId equals sb.Id
join ne in db.xNotificationEvents on sc.NotificationEventId equals ne.Id
where ne.Name == notificationEvent && sb.Name == subscriber && sc.Token == token
select new
{
SubscriberName = sb.Name,
NotificationEvent = ne.Name,
NotificationEventId = ne.Id,
SubscriberId = sb.Id,
SubscriptionId = sc.Id
}).SingleOrDefault();
if (xSubscriptionDB == null)
{
throw new Exception("Subscription for subscriber " + subscriber + " for notification event " + notificationEvent + " not found with token " + token);
}
else
{
var subscriptionDB = (from sc in db.xSubscriptions
where sc.Id == xSubscriptionDB.SubscriptionId
select sc).SingleOrDefault();
// Delete the subscription
db.xSubscriptions.Remove(subscriptionDB);
db.SaveChanges();
}
}
}
/// <summary>
/// Stores a service subscription to a notification in the database
/// </summary>
/// <param name="subscriber"></param>
/// <param name="notificationEvent"></param>
/// <param name="notifyUrl"></param>
/// <returns>A token that must be used when unsubscribing</returns>
public string Subscribe(string subscriber, string notificationEvent, string emailAddress, string notifyUrl)
{
using (var db = new XanoSNCEntities())
{
var token = Guid.NewGuid().ToString();
var xNotificationEvent = (from ne in db.xNotificationEvents
where ne.Name == notificationEvent
select ne).SingleOrDefault();
if (xNotificationEvent == null)
{
throw new Exception("Notification event with name: " + notificationEvent + " has not been published.");
}
var subscriberId = 0;
var xSubscriber = (from s in db.xSubscribers
where s.Name == subscriber
select s).SingleOrDefault();
if (xSubscriber == null)
{
var newSubscriber = new xSubscriber()
{
Name = subscriber,
CreatedDate = DateTime.Now
};
db.xSubscribers.Add(newSubscriber);
subscriberId = newSubscriber.Id;
}
else
{
subscriberId = xSubscriber.Id;
}
var xSubscriptionDB = (from sc in db.xSubscriptions
join sb in db.xSubscribers on sc.SubscriberId equals sb.Id
join ne in db.xNotificationEvents on sc.NotificationEventId equals ne.Id
where ne.Name == notificationEvent && sb.Name == subscriber
select new
{
SubscriberName = sb.Name,
NotificationEvent = ne.Name,
NotificationEventId = ne.Id,
SubscriberId = sb.Id
}).SingleOrDefault();
if (xSubscriptionDB == null)
{
db.xSubscriptions.Add(new xSubscription()
{
NotificationEventId = xNotificationEvent.Id,
SubscriberId = subscriberId,
NotifyURL = notifyUrl,
Token = token,
EmailAddress = emailAddress,
CreatedDate = DateTime.Now
});
}
else
{
throw new Exception("Subscription: " + notificationEvent + " already exists.");
}
db.SaveChanges();
return token;
}
}
/// <summary>
/// Called by the WCF service for each subscriber that we attempted to called
/// </summary>
/// <param name="notificationId">Id of the notification record</param>
/// <param name="subscriber">Subscriber we attempted to contact</param>
/// <param name="errorMessage">If an error occurred, this will be a non-null string with the message</param>
public void CreateSubscriptionNotification(int notificationId, string subscriber, string errorMessage)
{
// Find the subscription id by subscriber name and notification event name
// We need it to create a list of records for each subscriber that we attemped to contact
using (var db = new XanoSNCEntities())
{
var subscriptionDB = (from sb in db.xSubscriptions
join sc in db.xSubscribers on sb.SubscriberId equals sc.Id
select sb).SingleOrDefault();
if (subscriptionDB == null)
throw new Exception("Subscription does not exist!");
var subscriptionNotification = new xSubscriptionNotification()
{
CreatedDate = DateTime.Now,
NotificationError = errorMessage,
SubscriptionId = subscriptionDB.Id,
};
db.xSubscriptionNotifications.Add(subscriptionNotification);
db.SaveChanges();
}
}
public int CreateSubscriptionNotification(int notificationId, string subscriber)
{
using (var db = new XanoSNCEntities())
{
var xSubscriber = (from s in db.xSubscribers
where s.Name == subscriber
select s).SingleOrDefault();
if (xSubscriber == null)
{
throw new Exception("Subscriber with name: " + subscriber + " does not exist.");
}
var subscriptionNotification = new xSubscriptionNotification()
{
NotificationId = notificationId,
SubscriptionId = xSubscriber.Id,
CreatedDate = DateTime.Now
};
db.xSubscriptionNotifications.Add(subscriptionNotification);
db.SaveChanges();
return subscriptionNotification.Id;
}
}
