Spring Boot Integration: Inversion of Control

Spring Boot Integration: Inversion of Control

Beyond dependency injection. Most of the time, dependency injection is the first thing that comes to mind whenever the concept of inversion of control is brought up. For this article, I’d like to shed some light on method invocation as well, which is the concept being heavily utilized by Spring Integration.

Most of the time, dependency injection is the first thing that comes to mind whenever the concept of inversion of control is brought up. For this article, I’d like to shed some light on method invocation as well, which is the concept being heavily utilized by Spring Integration.


Type-Level Coupling and System-Level Coupling

Before diving into the code, let’s first talk about the types of coupling inversion of control solves: type-level coupling and system-level coupling.

Type-level coupling is probably the most understood — it’s coupling between types, and it’s solved by using dependency injection. I bet most of you know this already, but let me include an example below demonstrating the concept for clarity.

Suppose we have an OrderService class, and it’s being instantiated in other classes.

java spring-boot programming spring-integration spring

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