Go Composition

Skill: go-composition

Composición, embedding y extensibilidad en Go.

Cuándo usar este skill

• Al extender tipos existentes
• Al combinar comportamientos
• Al implementar herencia de comportamiento

Struct Embedding

type BaseValidator struct {
    name string
}

func (b *BaseValidator) Name() string { return b.name }

type TerminologyValidator struct {
    BaseValidator  // Embedding
    service TerminologyService
}

// TerminologyValidator hereda Name() automáticamente

Interface Embedding

type Reader interface { Read(...) }
type Writer interface { Write(...) }

type ReadWriter interface {
    Reader
    Writer
}

Composición de Servicios

type CompositeTerminologyService struct {
    services []TerminologyService
}

func (c *CompositeTerminologyService) ValidateCode(...) (bool, error) {
    for _, svc := range c.services {
        valid, err := svc.ValidateCode(...)
        if err == nil {
            return valid, nil
        }
    }
    return false, errors.New("no service could validate")
}

Decorator Pattern

type LoggingHandler struct {
    wrapped Handler
    logger  Logger
}

func (l *LoggingHandler) Handle(ctx context.Context, req Request) (Response, error) {
    l.logger.Info("handling request")
    return l.wrapped.Handle(ctx, req)
}

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