Go-DDD-OrderServiceFactory.go

// Package services holds all the services that connects repositories into a business flow
package services

import (
	"github.com/percybolmer/ddd-go/domain/customer"
)

// OrderConfiguration is an alias for a function that will take in a pointer to an OrderService and modify it
type OrderConfiguration func(os *OrderService) error

// OrderService is a implementation of the OrderService
type OrderService struct {
	customers customer.CustomerRepository
}

// NewOrderService takes a variable amount of OrderConfiguration functions and returns a new OrderService
// Each OrderConfiguration will be called in the order they are passed in
func NewOrderService(cfgs ...OrderConfiguration) (*OrderService, error) {
	// Create the orderservice
	os := &OrderService{}
	// Apply all Configurations passed in
	for _, cfg := range cfgs {
		// Pass the service into the configuration function
		err := cfg(os)
		if err != nil {
			return nil, err
		}
	}
	return os, nil
}