问题
I'm teasing out MacWire for dependency injection.
One thing that i found useful with Guice is the assisted inject, to autowire a factory that would help you to create some service that needs run parameters.
Is there something similar with Macwire ?
回答1:
Injectable factories are supported, but are not really a feature of MacWire, rather in MacWire's spirit, you can "just use Scala".
In this case, you can use function types. Following the Guice examples, let's say you want to create a Payment parametrized by a startDate: Date and amount: Money. You could define a dependency:
val paymentFactory = (startDate: Date, amount: Money) => wire[Payment]
// or create the payment in any other way
and then use it as a normal dependency:
class ServiceUsingPayment(paymentFactory: (Date, Money) => Payment)
val serviceUsingPayment = wire[ServiceUsingPayment]
You could also use a type alias to avoid repeating the function signature, and use that alias when declaring another service's dependencies (as in ServiceUsingPayment above):
type PaymentFactory = (Date, Money) => Payment
来源：https://stackoverflow.com/questions/25457400/injectable-factory-with-macwire