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 AddOrUpdateSubscription(SubscriptionEntity subscriptionEntity)
{
TableOperation insertOrReplaceOperation = TableOperation.InsertOrReplace(subscriptionEntity);
Table.Execute(insertOrReplaceOperation);
}