Go-MediatR
MediatR
Go-MediatR | MediatR | |
---|---|---|
4 | 53 | |
188 | 10,685 | |
- | - | |
6.3 | 5.9 | |
6 months ago | 24 days ago | |
Go | C# | |
MIT License | Apache License 2.0 |
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Go-MediatR
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go-ecommerce-microservices: A practical e-commerce microservices, built with cqrs, event sourcing, vertical slice architecture, event-driven architecture.
Some of the features: - ✅ Using Vertical Slice Architecture as a high level architecture - ✅ Using Event Driven Architecture on top of RabbitMQ Message Broker with a custom [Event Bus](pkg/messaging/bus/) - ✅ Using Event Sourcing in Audit Based services like [Orders Service](services/orders/) - ✅ Using CQRS Pattern and Mediator Patternon top of Go-MediatR library - ✅ Using Dependency Injection and Inversion of Controlon top of uber-go/fx library - ✅ Using RESTFul api with Echo framework and using swagger with swaggo/swag library - ✅ Using Postgres and EventStoreDB to write databases with fully supports transactions(ACID) - ✅ Using MongoDB and Elastic Search for read databases (NOSQL) - ✅ Using OpenTelemetry for collection Distributed Tracing with using Jaeger and Zipkin - ✅ Using OpenTelemetry for collection Metrics with using Prometheus and Grafana - ✅ Using Unit Test for testing small units with mocking dependent classes and using Mockery for mocking dependencies - ✅ Using End2End Test and Integration Test for testing features with all of their real dependeinces using docker containers (cleanup tests) and testcontainers-go library
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Mediator pattern in Go - is the juice worth to squeeze?
There are some mediator-like libraries like https://github.com/mehdihadeli/Go-MediatR or https://github.com/erni27/mob but they are not used widely like for example their C# sibling https://github.com/jbogard/MediatR. Also, neither I see custom implementations of mediator in many projects.
- Go-MediatR: A Golang package inspired by the`.Net MediatR` library, for easier implementation of a CQRS style application.
- `Go-MediatR`, implements the mediator pattern in Golang and helpful in creating CQRS-based applications. Inspired by `MediatR` library in the .NET
MediatR
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The Monad Invasion - Part 2: Monads in Action!
You probably noticed that .SetName() returns a Either. You may have come across Unit in libraries like MediatR or Language-Ext. It's a simple construct representing a type with only one possible value. We use it as a placeholder for operations that do not return a value but may return another state. In our example, .SetName() is a Command that does not return a value but may fail. Therefore, the monad Either carries two possible states: Right (without value) or Left (with an Error).
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How small is the smallest .NET Hello World binary?
The widely used MediatR library[0] could be used to do that as well, just FYI.
[0]: https://github.com/jbogard/MediatR
- Cannot use disposed service
- Exception handling between controller and service
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CQRS: How to handle duplicate queries inside a CommandHandler
Hope this GH issue shed some light on why injecting handler inside another handler is not good https://github.com/jbogard/MediatR/issues/400
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Is MediatR the only real CQRS solution for .Net?
From: https://github.com/jbogard/MediatR
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Easiest way to build the fastest REST API in C# and .NET 7 using CQRS
I gave it a go and I was impressed how easy and fast it was to set it all up. Since I'm not a big fan of REPR pattern almost all my projects are using CQRS pattern with a help of MediatR ](https://github.com/jbogard/MediatR) I immediately started going over something similar that Fast Endpoints offer which is a command bus.
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MVVM Question: How do you manage the interaction between Model and ViewModel?
I'd use a dedicated event bus based on Reactive Extensions or MediatR to publish domain events from your domain services. This probably doesn't solve all your ViewModel update problems as is, maybe you need to revise the granularity (maybe you can have smaller ViewModels that refresh single property that exposes the Model) and lifespan (sometimes you can create a ViewModel, make it perform it's task and then discard it completely) of your ViewModels.
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Async Methods after setting a property.
If you're finding yourself in a situation where you need to turn this behavior into a pattern because there are a lot of View Models that need to execute async business logic in response to some changes, I'd go with something like MediatR or Reactive Extensions. The idea is, again, that some other, probably business-level, component listens to changes in a decoupled way (that means it doesn't subscribe directly to your View Model, but to an event bus instead). View Model publishes change events to the event bus, and business-component reacts to these events by executing the business logic.
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I don't get why I should use Redux
What people really want is to design the logic of an app independently from the component hierarchy. That means you need to store state somewhere other than the components and you need to dispatch events that are not attached to the component hierarchy. Also, a one way data flow has well known benefits as described by things like CQRS, RabbitMQ, and MediatR.
What are some alternatives?
go-food-delivery-microservices - 🍕 A practical and imaginary food delivery microservices, built with golang, domain-driven design, cqrs, event sourcing, vertical slice architecture, event-driven architecture, and the latest technologies.
Mediator.Net - A simple mediator for .Net for sending command, publishing event and request response with pipelines supported
swag - Automatically generate RESTful API documentation with Swagger 2.0 for Go.
RabbitMQ - Open source RabbitMQ: core server and tier 1 (built-in) plugins
mob - mob is a generic-based, simple mediator / event aggregator Golang library. It supports in-process requests / events processing.
Polly - Polly is a .NET resilience and transient-fault-handling library that allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner. From version 6.0.1, Polly targets .NET Standard 1.1 and 2.0+.
copier - Copier for golang, copy value from struct to struct and more
Brighter - A framework for building messaging apps with .NET and C#.
mockery - A mock code autogenerator for Go
ApiEndpoints - A project for supporting API Endpoints in ASP.NET Core web applications.
fx - A dependency injection based application framework for Go.
FluentValidation - A popular .NET validation library for building strongly-typed validation rules.