Is There a Way to Programmatically Find All Implementations of an Interface in Golang?

Detecting All Implementations of an Interface in Golang

Question:

In Golang, is it possible to programmatically identify all structs that implement a specified interface? This would allow for automated initialization and termination of these structs at runtime, without hardcoding their names in the code.

Answer:

Unfortunately, the short answer is no.

Explanation:

Golang is a strictly typed language, which means that the linker can eliminate type definitions, methods, and functions that are not used by the application. Therefore, unless a type (such as struct A) is referenced and utilized somewhere in the code, it will not be included in the compiled binary.

Furthermore, even accessing currently existing instances of types implementing a specific interface is not feasible.

Alternative Approach:

In order to achieve the desired functionality, an alternative approach is to create a global map or slice that stores instances of structs implementing the interface. Each struct can then add an instance to this map using an init function that is automatically called at application startup. Then, when necessary, the application can iterate through the map and invoke the desired methods on the instances.

This approach allows for dynamic registration of structs and eliminates the need for hardcoding their names in the code. However, if there are multiple instances of a particular type, additional mechanisms must be implemented to manage their registration and de-registration.

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