cqrs

JOliver EventStore - How to access all stored events?

由 ⅰ亾dé卋堺 提交于 2020-01-13 05:07:08
问题 How can I access all stored events in the EventStore to rebuild my read models? A method called GetFrom is mentioned at question J Oliver EventStore V2.0 questions, but I cannot find this method on the interface "IStoreEvents" which is returned from Wireup. 回答1: That method is a part of the IPersistStreams interface and not the IStoreEvents interface. The API needs to be refined slightly to accommodate that. I have just added a method to IStoreEvents called GetFrom(DateTime started) that

examples of testing the domain using joliver commondomain/eventstore

由 北城以北 提交于 2020-01-12 18:51:55
问题 I'm looking for good examples of testing the domain using JOlivers CommonDomain and EventStore I have been watching greg youngs videos and he has a nice simple abstract aggregate root test fixture. is there anything like that which can be used with these libs? 回答1: Edit: due to the immaturity of and forced inheritance in CommonDomain, Documently/develop now rolls its own simpler EventRouter Yes, I have a sample here: https://github.com/haf/Documently that shows how you can use it together and

CQRS pattern - interfaces

由 吃可爱长大的小学妹 提交于 2020-01-11 03:34:12
问题 I'm new at the CQRS pattern, but I'd like to understand why you should use two interfaces: public interface IQuery{} public interface ICommand{} Instead of just one interface (for example IExecutable, or whatever...) Than you also have one handler (for example IExecutionHandler, or whatever...) And if you want, you could still split it up into an ICommandExecutionHandler and a IQueryExecutionHandler Update: an attempt Next code is just an example of how I see it. It's possible that I'm

Is MediatR a good fit for updating multiple MongoDB read models?

由 江枫思渺然 提交于 2020-01-05 05:49:06
问题 On a recent project, I used NServiceBus to update multiple (typically two) MongoDB read models as a result of commands initiated by users. After reading more about MediatR it seems like, as the read models are part of this application (i.e. no other services are consuming the ISomethingHappened events), NServiceBus was probably overkill here. That said, the guaranteed delivery and retries that NServiceBus provides aren't necessary with MediatR, however for most applications, I can't afford to

How are the missing events replayed?

由 99封情书 提交于 2020-01-04 01:58:12
问题 I am trying to learn more about CQRS and Event Sourcing (Event Store). My understanding is that a message queue/bus is not normally used in this scenario - a message bus can be used to facilitate communication between Microservices, however it is not typically used specifically for CQRS. However, the way I see it at the moment - a message bus would be very useful guaranteeing that the read model is eventually in sync hence eventual consistency e.g. when the server hosting the read model

Need help implementing Command Handlers/Bus using Unity DI

由 时间秒杀一切 提交于 2020-01-03 02:04:17
问题 Folks, I am trying to re-factor a legacy brownfield application into a CQRS architecture with commands and a command bus for domain modifications. The application will more than likely be implemented in Asp.Net MVC3. My employer prefers the use of Unity for DI in MVC applications. Any examples I can find showing a dependency container for command/bus resolution are based on Structuremap or Autofac, however I will need to use Unity in this implementation. Has anyone used Unity in this manner

Is there any specific way for Axon migration from 2.4.3 version to 3.1.1

由 邮差的信 提交于 2020-01-02 10:13:28
问题 I am new to axon and doing migration from Axon 2.4.3 to 3.1.1 but I am not able to find any migration guide which is available for other version? Can you please share your experience on how to do the same. I am facing a lot problem, some classes have been removed, some packages have been changed. For some classes I am even not able to find replacements, so please help me with some suggestion. If there is a guide for same please provide me with link of that. Thanks in Advance Acctually I am

领域驱动设计学习

由 本秂侑毒 提交于 2020-01-02 06:45:41
学习网址： EntityFramework之领域驱动设计实践 - 前言 EntityFramework之领域驱动设计实践（一）：从DataTable到EntityObject EntityFramework之领域驱动设计实践（二）：分层架构 EntityFramework之领域驱动设计实践（三）：案例：一个简易的销售系统 EntityFramework之领域驱动设计实践（四）：存储过程，领域驱动的反模式 EntityFramework之领域驱动设计实践（五）：聚合 EntityFramework之领域驱动设计实践（六）：模型对象的生命周期 - 工厂 EntityFramework之领域驱动设计实践（七）：模型对象的生命周期 - 仓储 EntityFramework之领域驱动设计实践（八）：仓储的实现（基本篇） EntityFramework之领域驱动设计实践（九）：仓储的实现（深入篇） EntityFramework之领域驱动设计实践（十）：规约（Specification）模式 EntityFramework之领域驱动设计实践【扩展阅读】：服务（Services） EntityFramework之领域驱动设计实践【扩展阅读】：CQRS体系结构模式 学习心得： respository层(仓储)： 不仅仅是进行数据库CRUD操作，且解耦领域模型与技术架构，如果没有仓储层

CQRS - Eventual Consistency

由 自古美人都是妖i 提交于 2020-01-02 04:00:11
问题 I have the following scenario which I need to implement following the CQRS pattern: a user logs in the user enters some insurance details the user ask for a decision to be applied the user views the result of the decision This seems fairly straightforward, however my problem is between step 3 and 4, on step 3 I send a ApplyForDecision command which will get a decision from a underwriting service, an event with the result of that decision is then sent to the BUS for the read store to later

NEventStore issue with replaying events

由 倖福魔咒の 提交于 2020-01-01 09:43:22
问题 We are using CQRS + ES. The ES is NEventStore (folrmerly JOliver EventStore). We have 2 aggregates in different commands. The projections of the second AR depends on the data written by the first AR projections in the read model. The problem is that when we run the software everything goes so fast that sometimes the two aggregates are persisted in the event store with identical datetime (column CommitStamp). When replaying the events we get them from the beginning ordered by CommitStamp
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