Managing Modular Dependencies and Registration Order

[minhhungit]

Hi @cbcrouse , I wonder in case your application is modularized, and you have many modules, for example

• Module B and module C are depended on module A
• and module C is also depended on module B
  ( A <= B <= C )

Does StartupOrchestration support registry and manage order of services and how does it work (whether this library applied or acting like topological algorithm)

Thank you

[cbcrouse]

Hi @minhhungit, StartupOrchestration.NET does not currently provide any specific support for managing service registration order in modularized applications with complex dependencies between modules. However, since the registration of services is performed through expressions, you can control the order of registration of services within a module. For cross-module dependencies, it may be necessary to manually manage the registration order by explicitly registering services in the correct order.

Dependencies in the application will be registered before any dependencies in the presentation layers. If you look at the log output sample on the readme, you will be able to see the order in which dependencies are registered. However, I'll break that example down below:

// Here, application dependencies are registering in the order specified.

[2020:06:03 11:05:03.723 PM] [Verbose] [] '"value(Infrastructure.Startup.AppStartupOrchestrator).RegisterAutoMapper()"' was started...
[2020:06:03 11:05:03.724 PM] [Verbose] [] '"value(Infrastructure.Startup.AppStartupOrchestrator).RegisterAutoMapper()"' completed successfully!
[2020:06:03 11:05:03.724 PM] [Verbose] [] '"value(Infrastructure.Startup.AppStartupOrchestrator).ServiceCollection.AddSingleton()"' was started...
[2020:06:03 11:05:03.724 PM] [Verbose] [] '"value(Infrastructure.Startup.AppStartupOrchestrator).ServiceCollection.AddSingleton()"' completed successfully!

// Now, you can see that Presentation.API.Startup has begun registering its dependencies in the order specified.

[2020:06:03 11:05:04.776 PM] [Verbose] [] '"value(Presentation.API.Startup).ServiceCollection.AddAuthorization()"' was started...
[2020:06:03 11:05:04.883 PM] [Verbose] [] '"value(Presentation.API.Startup).ServiceCollection.AddAuthorization()"' completed successfully!
[2020:06:03 11:05:04.883 PM] [Verbose] [] '"value(Presentation.API.Startup).ServiceCollection.AddHealthChecks()"' was started...
[2020:06:03 11:05:04.884 PM] [Verbose] [] '"value(Presentation.API.Startup).ServiceCollection.AddHealthChecks()"' completed successfully!
[2020:06:03 11:05:04.884 PM] [Verbose] [] '"value(Presentation.API.Startup).AddMvcCore()"' was started...
[2020:06:03 11:05:05.342 PM] [Verbose] [] '"value(Presentation.API.Startup).AddMvcCore()"' completed successfully!
[2020:06:03 11:05:05.343 PM] [Verbose] [] '"value(Presentation.API.Startup).AddSwagger()"' was started...
[2020:06:03 11:05:05.363 PM] [Verbose] [] '"value(Presentation.API.Startup).AddSwagger()"' completed successfully!

Let me know if this answer helps.

[minhhungit]

thank you FYI