public async Task AddEventAsync(BaseItemEvent evt)
{
var entity = new EventStoreEntity();
switch (evt)
{
case ItemCreatedEvent created:
entity.Type = nameof(ItemCreatedEvent);
entity.ItemName = created.Name;
break;
case ItemDeletedEvent deleted:
entity.Type = nameof(ItemDeletedEvent);
break;
case ItemUpdatedEvent updated:
entity.Type = nameof(ItemUpdatedEvent);
entity.ItemName = updated.Name;
break;
default:
throw new ArgumentOutOfRangeException($"Specified type {evt.GetType()} is not supported");
}
entity.EventId = evt.EventId;
entity.EventDate = evt.EventDate;
entity.ItemId = evt.ItemId;
entity.UserName = evt.UserName;
entity.Version = evt.Version;
await this.collection.InsertOneAsync(entity);
}
public async Task <EventStoreEntity> InsertEntityAsync(string streamId, string sequence, ConferenceModel model)
{
var entity = new EventStoreEntity(streamId, sequence)
{
EventType = model.Event,
Payload = JsonConvert.SerializeObject(model.Data)
};
var insertOrMergeOperation = TableOperation.Insert(entity);
var result = await _eventStoreTable.ExecuteAsync(insertOrMergeOperation);
return(result.Result as EventStoreEntity);
}
public static async Task UpdateConferenceLookUpProjectionAsync(CloudTable eventProjectionsTable, EventStoreEntity entity)
{
var projection = eventProjectionsTable
.CreateQuery <EventProjectionsEntity>()
.Where(x => x.PartitionKey == "LookUps" && x.RowKey == "AllConferences")
.Select(x => x)
.SingleOrDefault() ?? await CreateLookUpProjectionAsync(eventProjectionsTable);
var data = !string.IsNullOrEmpty(projection.Payload)
? JsonConvert.DeserializeObject <List <ConferenceDataModel> >(projection.Payload)
: new List <ConferenceDataModel>();
var eventData = JsonConvert.DeserializeObject <ConferenceDataModel>(entity?.Payload);
var conferenceData = data.SingleOrDefault(x => x.Id == eventData.Id);
switch (entity?.EventType)
{
case "Conference.Created":
data.Add(eventData);
break;
case "Conference.SeatsAdded":
if (conferenceData != null)
{
conferenceData.Seats += eventData.Seats;
}
break;
case "Conference.SeatsRemoved":
if (conferenceData != null)
{
conferenceData.Seats -= eventData.Seats;
}
break;
}
projection.Payload = JsonConvert.SerializeObject(data);
var insertOrMergeOperation = TableOperation.InsertOrReplace(projection);
await eventProjectionsTable.ExecuteAsync(insertOrMergeOperation);
}
