android - 改造 2.6.0 : Custom Coroutines CallAdapterFactory

Question

我需要在我的 api 中进行自定义错误处理，并且我想在新版本的 Retrofit 中使用协程。由于我们不必再使用 Deferred，我们自己的 Jake Wharton 一个月前在 reddit 上写了这篇文章

https://github.com/square/retrofit/blob/master/samples/src/main/java/com/example/retrofit/RxJavaObserveOnMainThread.java

但是我在正确创建 CallAdapterFactory 时遇到了问题。

具体来说，我不明白:“委托(delegate)给内置工厂，然后将值包装在密封类中”

是否有人已经在使用此设置可以提供帮助？

这是当前代码

sealed class Results<out T: Any> {
    class Success<out T: Any>(val response: T): Results<T>()
    class Failure(val message: String, val serverError: ServerError?): Results<Nothing>()
    object NetworkError: Results<Nothing>()
}


class ResultsCallAdapterFactory private constructor() : CallAdapter.Factory() {

    companion object {
        @JvmStatic
        fun create() = ResultsCallAdapterFactory()
    }

    override fun get(returnType: Type, annotations: Array<Annotation>, retrofit: Retrofit): CallAdapter<*, *>? {
        return try {
            val enclosedType = returnType as ParameterizedType
            val responseType = getParameterUpperBound(0, enclosedType)
            val rawResultType = getRawType(responseType)
            val delegate: CallAdapter<Any,Any> = retrofit.nextCallAdapter(this,returnType,annotations) as CallAdapter<Any,Any>
            if(rawResultType != Results::class.java)
                null
            else {
                object: CallAdapter<Any,Any>{
                    override fun adapt(call: Call<Any>): Any {
                         val response = delegate.adapt(call)
                        //What should happen here?
                        return response
                    }

                    override fun responseType(): Type {
                        return delegate.responseType()
                    }

                }
            }
        } catch (e: ClassCastException) {
            null
        }

    }
}

Answer 1

我已经创建了这样一个工厂的例子，你可以找到它here on GitHub .另请查看类似的问题:How to create a call adapter for suspending functions in Retrofit? .