public async Task Save(IEventStorePosition position)
{
try
{
var collection = database.GetCollection <LastEventPosition>(typeof(LastEventPosition).Name);
var filter = Builders <LastEventPosition> .Filter.Eq("_id", Constants.LastEventPositionKey);
var entity = await collection.Find(filter).FirstOrDefaultAsync();
if (entity == null)
{
entity = new LastEventPosition {
Id = Constants.LastEventPositionKey, CommitPosition = position.CommitPosition, PreparePosition = position.PreparePosition
};
await collection.InsertOneAsync(entity);
}
else
{
if (position.CommitPosition > entity.CommitPosition && position.PreparePosition > entity.PreparePosition)
{
entity.CommitPosition = position.CommitPosition;
entity.PreparePosition = position.PreparePosition;
await collection.FindOneAndReplaceAsync(filter, entity);
}
}
}
catch (Exception e)
{
logger.LogError($"EventStorePositionRepository: Error while updating commit position: {e.Message}, StackTrace: {e.StackTrace}");
throw;
}
}
public async Task <IEventStorePosition> GetLastPosition()
{
try
{
var collection = database.GetCollection <LastEventPosition>(typeof(LastEventPosition).Name);
var filter = Builders <LastEventPosition> .Filter.Eq("_id", Constants.LastEventPositionKey);
var result = await collection.CountDocumentsAsync(filter) > 0 ? (await collection.FindAsync(filter)).First() : null;
if (result == null)
{
result = new LastEventPosition
{
Id = Constants.LastEventPositionKey,
CommitPosition = -1,
PreparePosition = -1
};
await collection.InsertOneAsync(result);
}
return(new EventStorePosition(result.CommitPosition, result.PreparePosition));
}
catch (Exception e)
{
logger.LogError($"EventStorePositionRepository: Error getting LastSavedPostion, Message: {e.Message}, StackTrace: {e.StackTrace}");
throw;
}
}