public async Task <ProjectionReadModel> RetrieveProjectionInfo()
{
var collection = _db.GetCollection <ProjectionReadModel>("readmodel");
ProjectionReadModel info = null;
var filter = new BsonDocument();
using (var cursor = await collection.FindAsync(filter))
{
info = await cursor.FirstOrDefaultAsync();
}
if (info == null)
{
info = new ProjectionReadModel()
{
Id = Guid.NewGuid(),
Version = -1
};
}
_logger.DebugWithContext("Retrieved projection info from DB", info);
return(info);
}
public async Task UpdateProjectionInfo(ProjectionReadModel model)
{
_logger.DebugWithContext("Updating projection info", model);
var collection = _db.GetCollection <ProjectionReadModel>("readmodel");
var filter = new BsonDocument();
var options = new UpdateOptions {
IsUpsert = true
};
await collection.ReplaceOneAsync(filter, model, options);
}
protected async override Task <long> GetStartEventPosition()
{
_info = await _infoRepo.RetrieveProjectionInfo();
return(_info.Version + 1);
}
