public async Task FollowStream(Guid streamId, IStreamManager streamManager, IAggregateSettings aggregateSettings)
{
_streamId = streamId;
_streamManager = streamManager;
_aggregateSettings = aggregateSettings;
var commitMinimumRevision = 0;
_stream = await _streamManager.GetStream(_streamId).ConfigureAwait(false);
if (_stream.SnapshotRevision > 0)
{
var snapshot = await _streamManager.GetSnapshot(_stream.StreamId, _stream.SnapshotRevision);
AggregateDataStructure = (T)snapshot.SnapshotData;
commitMinimumRevision = snapshot.SnapshotHeadCommit + 1;
}
var commits = await _streamManager.GetCommits(_streamId, commitMinimumRevision).ConfigureAwait(false);
var events = commits
.OrderBy(x => x.CommitNumber)
.Select(x => x.Event);
foreach (var @event in events)
{
ApplyEvent(@event);
}
}
public static IServiceCollection RegisterEventSourcing(this IServiceCollection services, IAggregateSettings aggregateSettings)
{
services.AddSingleton(aggregateSettings);
services.AddSingleton<IEventStreamReader, EventStreamReader>();
return services;
}
public EventStreamReader(IStreamManager streamManager, IAggregateSettings aggregateSettings)
{
_streamManager = streamManager;
_aggregateSettings = aggregateSettings;
}