如何使用MacWire(播放框架)向服务注入依赖项 [英] how to inject dependencies to a service with MacWire (play framework)

问题描述

我有一个服务类，并且该服务具有一个方法getSomethingFromApi，现在，我想拥有一个播放Configuration实例，以便可以从application.conf中提取内容，一个播放WSClient，以便可以执行http调用.

I have a service class, and the service have one method getSomethingFromApi , now , I want to have play Configuration instance so I can pull stuff from the application.conf, and a play WSClient so I can perform http calls.

这就是我希望服务显示的样子:

this is how I want my service to look:

class MyApiService {

  def getSomethingFromApi(whichApi: String): Future[ApiRes] = {
    wsClient.url(configuration.getString(whichApi)).withHttpHeaders(("Content-Type", "application/json")).get.map { res =>
      response.status match {
        case Status.OK => // do something
        case _ => throw new Exception
      }
    }
  }

}

这是用来连接我的服务的ServicesModule:

and this is the ServicesModule that is wiring my services:

import com.softwaremill.macwire._

trait ServicesModule {

  lazy val myService: MyApiService = wire[MyApiService]

}

我现在的问题是使用连线配置和WSClient实例的正确方法是什么?因为当前我需要在我的服务中使用那些实例，但是我没有它们，我该怎么做才正确? 谢谢

my question now is what is the right way of using wiring play Configuration and WSClient instances..? cause currently i need those instances in my service but i dont have them, how should i do this the right way? thanks

推荐答案

对于配置，我建议使用 PureConfig之类的东西. 并按如下所示加载配置

For the configuration I suggest using something like PureConfig and load the configuration as follows

import pureconfig._
import pureconfig.error.ConfigReaderFailures

case class YourConfClass(name: String, quantity: Int)

val config: Either[pureconfig.error.ConfigReaderFailures,YourConfClass] = loadConfig[YourConfClass]

然后可以使用macwire将其传递到应用程序的任何组件上.

This then can be passed on to any component of your app using macwire.

从2.6.X版开始，应使用ws依赖项提供的AhcWSComponents，如下所示:

As of Play 2.6.X one should use AhcWSComponents that are provided by the ws dependency as follows:

在build.sbt文件中，将ws依赖项添加到项目中

In your build.sbt file add the ws dependency to your project

libraryDependencies += ws

在模块特征中混入AhcWSComponents特征并连接WSClient

In your module trait mix-in the AhcWSComponents trait and wire the WSClient

trait ServicesModule with AhcWSComponents {
    lazy val wsClient = wire[WSClient]
    lazy val apiService = wire[MyApiService]
}

在您的MyApiServic e中，添加WSClient作为参数.到构造函数

In your MyApiService add the WSClient as a param. to the constructor

class MyApiService(wsClient: WSClient) { ... }

现在您完成了.该一般规则适用于所有提供的依赖项.

And now you're done. This general rule applies to all provided dependencies.

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