private SubscriptionEntity GetSubscriptionEntryForOperation(EntityEvent entityEvent, SubscriptionEntity subscriptionCurrentlyOnFile)
{
string entityId = GetEntityId(entityEvent);
SubscriptionEntity subscriptionEntryToReturn = subscriptionCurrentlyOnFile;
if (subscriptionEntryToReturn == null)
{
// Create a new entity, based on the current event
subscriptionEntryToReturn = new SubscriptionEntity(entityId);
// Populate fields specificcally for entities we are seeing for the first time
subscriptionEntryToReturn.PreviousState = null;
}
else
{
// Update existing entity when we have seen it before
subscriptionEntryToReturn.PreviousState = subscriptionCurrentlyOnFile.State;
}
// Common fields
subscriptionEntryToReturn.State = entityEvent.EntityState.ToString();
subscriptionEntryToReturn.Created = new DateTimeOffset(entityEvent.EntityId.Created);
subscriptionEntryToReturn.LastOperation = entityEvent.EntityState.ToString();
subscriptionEntryToReturn.LastOperationId = entityEvent.OperationId;
subscriptionEntryToReturn.LastOperationTime = DateTimeOffset.UtcNow;
subscriptionEntryToReturn.LastEventId = entityEvent.EventId;
subscriptionEntryToReturn.Properties = SerializeProperties(entityEvent.Properties);
// CONSIDER: Promoting common user properties as columns in the table
return subscriptionEntryToReturn;
}
public void HandleSubscriptionNotifications(Guid subscriptionId, EntityEvent entityEvent)
{
string entityId = GetEntityId(entityEvent);
SubscriptionEntity susbcriptionEntityOnFile = WebApiApplication.Storage.SubscriptionStorage.GetSubscriptionById(entityId);
// Only process events we have not already processed - Notification events can be sent multiple times
if ((susbcriptionEntityOnFile == null) || (String.CompareOrdinal(entityEvent.EventId, susbcriptionEntityOnFile.LastEventId) != 0))
{
switch (entityEvent.EntityState)
{
case EntityState.Deleted:
WebApiApplication.Storage.SubscriptionStorage.DeleteSubscriptionById(entityId);
break;
case EntityState.Disabled:
case EntityState.Enabled:
case EntityState.Registered:
case EntityState.Unregistered:
case EntityState.Updated:
SubscriptionEntity newSubscriptionEntity = GetSubscriptionEntryForOperation(entityEvent, susbcriptionEntityOnFile);
WebApiApplication.Storage.SubscriptionStorage.AddOrUpdateSubscription(newSubscriptionEntity);
break;
//case EntityState.Migrated:
// break;
default:
// TODO: BAD REQUEST ?
break;
}
}
}
private static string GetEntityId(EntityEvent entityEvent)
{
return entityEvent.EntityId.Id.ToLowerInvariant();
}
