How to Dynamically Scan and Manipulate Structures Implementing a Specific Interface in Golang?

Golang: Scanning Structures with Specific Implementations

In Go, manipulating multiple structures with a shared interface can pose challenges. While it's possible to individually handle each structure instance, you may encounter the need to automatically find and manipulate all structures adhering to a specific interface.

The Problem

The scenario involves an implementation of an interface I by multiple structures (A, B, and C). Upon application startup, you need to invoke the start() method for each A, B, and C instance. Similarly, upon termination, you need to call the stop() method on these instances. However, you want to avoid hardcoding these specific structures in your code, allowing for seamless modifications as new structures implementing the I interface are introduced.

The Answer

Unfortunately, in Go, the approach you envision is not feasible. Go is a statically typed language, and the linker eliminates unused type definitions and methods. Therefore, types that are not explicitly referenced in your code will be omitted.

Alternative Solution

An alternative approach is to create a global map (or slice) that stores instances of each structure implementing the I interface. These instances can be registered during initialization using an init function:

<code class="go">var instMap = map[string]StartStopper

type A struct {}

func init() {
    instMap["A"] = new(A)
}</code>

During startup, you can iterate over the map and call the Start() method on each instance.

Handling Multiple Instances

If there can be multiple instances of each structure type, you'll need to modify your registration process to add instances to the map when they are created. You should also remove instances when they are no longer in use to prevent potential memory leaks.

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