/// <summary>
/// Loads and returns an aggregate by id, from the store.
/// </summary>
public async Task <T> Load <T>(string aggregateId, CancellationToken cancellationToken = default)
where T : Aggregate, new()
{
if (IsNullOrWhiteSpace(aggregateId))
{
throw new ArgumentException("Value cannot be null or whitespace.", nameof(aggregateId));
}
var stream = _getStreamName(typeof(T), aggregateId);
var aggregate = new T();
var nextPageStart = 0L;
do
{
var page = await _connection.ReadStreamEventsForwardAsync(
stream, nextPageStart, MaxReadSize, false, _userCredentials);
aggregate.Load(page.Events.Select(resolvedEvent =>
{
var dataType = _typeMapper.GetType(resolvedEvent.Event.EventType);
var data = _serializer.Deserialize(resolvedEvent.Event.Data, dataType);
return(data);
}).ToArray());
nextPageStart = !page.IsEndOfStream ? page.NextEventNumber : -1;
} while (nextPageStart != -1);
Log.Debug("Loaded {aggregate} changes from stream {stream}", aggregate, stream);
return(aggregate);
}
/// <summary>
/// Loads and returns an aggregate by id, from the store.
/// </summary>
public async Task <T> Load <T>(string aggregateId, CancellationToken cancellationToken = default)
where T : Aggregate, new()
{
var stream = _getStreamName(typeof(T), aggregateId);
var aggregate = new T();
var nextPageStart = 0L;
do
{
var page = await _connection.ReadStreamEventsForwardAsync(
stream, nextPageStart, MaxReadSize, false, _userCredentials);
aggregate.Load(page.Events.Select(resolvedEvent =>
{
var dataType = _typeMapper.GetType(resolvedEvent.Event.EventType);
var data = _serializer.Deserialize(resolvedEvent.Event.Data, dataType);
return(data);
}).ToArray());
nextPageStart = !page.IsEndOfStream ? page.NextEventNumber : -1;
} while (nextPageStart != -1);
return(aggregate);
}
private Action <EventStoreCatchUpSubscription, ResolvedEvent> EventAppeared(Projection projection) =>
async(_, e) =>
{
// always double check if it is a system event ;)
if (e.OriginalEvent.EventType.StartsWith("$"))
{
return;
}
// get the configured clr type name for deserializing the event
var eventType = _typeMapper.GetType(e.Event.EventType);
// try to execute the projection
await projection.Handle(_serializer.Deserialize(e.Event.Data, eventType));
// store the current checkpoint
await _checkpointStore.SetCheckpoint(e.OriginalPosition, projection);
};
/// <summary>
/// Loads and returns an aggregate by id, from the store.
/// </summary>
public async Task <T> Load <T>(string aggregateId) where T : Aggregate, new()
{
var stream = _getStreamName(typeof(T), aggregateId);
var aggregate = new T();
var page = await _connection.ReadStreamEventsForwardAsync(
stream, 0, 1000, false, _userCredentials);
aggregate.Load(page.Events.Select(resolvedEvent =>
{
var dataType = _typeMapper.GetType(resolvedEvent.Event.EventType);
var data = JsonConvert.DeserializeObject(
Encoding.UTF8.GetString(resolvedEvent.Event.Data), dataType, DefaultSettings);
return(data);
}).ToArray());
return(aggregate);
}
