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Support for scoped Consumers

See original GitHub issue

In some cases the consumer (IConsumer<T>) needs to inject scoped dependencies (like the EF DbContext) hence needs to be registered as scoped in the DI container. As a result, the SMB should create a scope and resolve such consumers in that scoped container. The scope should be bound to each message which represents a transaction or a unit of work.

Also related to #34 .

Issue Analytics

State:
Created 3 years ago
Reactions:1
Comments:8 (6 by maintainers)

Top GitHub Comments

1reaction

novercommented, Jan 28, 2021

I totally get that this is a complicated matter, also due to the other DI libraries that SMB supports 😃

My setup on a high level is the following:

Aspnet core 5.0 WebApi
Scoped background worker that runs a WebSocket client to consume events from an external system. Each “handler” for different message types are executed as separate threads on the thread-pool
Then I want those handlers to be able to send domain events to the platform (which is a monolith now to de-complicate some matters), thus using the InMemory provider
I experience the lockups in the background service worker when emitting the events.

Right now I have circumvented the problem by registering a whole lot of things as Singleton, but I would prefer them to be Scoped.

When I get a bit of time I can try to make a minimal repro of the setup to give you something to debug from.

Effectively this gives a per-message scope which I guess is the ask of this issue.

Exactly, spot on 😃

Anyway thanks for this awesome library.

0reactions

zaruszcommented, Apr 15, 2021

Hello, the feature has been implemented.

Any feedback on the proposed will be much appreciated!

A preview is available on nuget: https://www.nuget.org/packages/SlimMessageBus.Host/1.12.0-rc1 https://www.nuget.org/packages/SlimMessageBus.Host.Kafka/1.12.0-rc1 https://www.nuget.org/packages/SlimMessageBus.Host.AzureServiceBus/1.12.0-rc1 https://www.nuget.org/packages/SlimMessageBus.Host.Redis/1.12.0-rc1

The docs are here: https://github.com/zarusz/SlimMessageBus/blob/feature/scoped_consumers/docs/intro.md#per-message-di-container-scope https://github.com/zarusz/SlimMessageBus/blob/feature/scoped_consumers/docs/provider_memory.md#per-message-di-scope

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