Macwire可注射工厂 [英] Injectable factory with Macwire

问题描述

我正在淘汰MacWire进行依赖项注入。

I'm teasing out MacWire for dependency injection.

我发现对Guice有用的一件事是辅助注入，它可以自动连线工厂，这将帮助您创建需要运行参数的服务。

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.

Macwire是否有类似的东西？

Is there something similar with Macwire ?

推荐答案

可注入工厂是支持但不是MacWire的真正功能，而是按照MacWire的精神，您可以仅使用Scala。

Injectable factories are supported, but are not really a feature of MacWire, rather in MacWire's spirit, you can "just use Scala".

在这种情况下，可以使用函数类型。在Guice示例之后，假设您要创建由 startDate参数化的付款：日期和金额：金钱。您可以定义一个依赖项：

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

它是正常依赖项：

class ServiceUsingPayment(paymentFactory: (Date, Money) => Payment)
val serviceUsingPayment = wire[ServiceUsingPayment]

您还可以使用类型别名来避免重复功能签名，并且在声明另一个服务的依赖项时使用该别名（如上面的 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

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