MongoDbEventSequenceStore.cs

// The MIT License (MIT)
// 
// Copyright (c) 2015-2025 Rasmus Mikkelsen
// https://github.com/eventflow/EventFlow
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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using EventFlow.MongoDB.ValueObjects;
using MongoDB.Driver;

namespace EventFlow.MongoDB.EventStore
{
	public class MongoDbEventSequenceStore : IMongoDbEventSequenceStore
	{
		private const string _collectionName = "eventflow.counter";
		private readonly IMongoDatabase _mongoDatabase;

		public MongoDbEventSequenceStore(IMongoDatabase mongoDatabase)
		{
			_mongoDatabase = mongoDatabase;
		}

		public long GetNextSequence(string name)
		{
			MongoDbCounterDataModel ret = _mongoDatabase.GetCollection<MongoDbCounterDataModel>(_collectionName)
				.FindOneAndUpdate<MongoDbCounterDataModel>(
					x => x._id == name,
					new UpdateDefinitionBuilder<MongoDbCounterDataModel>().Inc(x => x.Seq, value: 1),
					new FindOneAndUpdateOptions<MongoDbCounterDataModel> {IsUpsert = true, ReturnDocument = ReturnDocument.After});

			return ret.Seq;
		}
	}
}