interface_based

Interface-Based Example

This example demonstrates how to bind a concrete type to an interface using ProvideAs.

What it demonstrates

• Registering a concrete implementation against an interface with gioc.ProvideAs[Logger](c, NewConsoleLogger)
• A service that depends on the Logger interface, not a concrete type
• The container automatically injects the concrete implementation

Code explanation

1. Logger – an interface with a Log(message string) method
2. ConsoleLogger – implements Logger
3. Service – constructor takes Logger (the interface)

ProvideAs[Logger] tells the container: "when someone needs a Logger, use NewConsoleLogger". When Service is resolved, its Logger parameter is matched by type to the interface binding.

This pattern enables:

• Decoupling – the service doesn't know which logger implementation it uses
• Testability – swap ConsoleLogger for a mock in tests
• Flexibility – change implementations without touching service code

Output

Log: Service initialized successfully