从类调用内联函数

Question

简而言之：我想创建一个类型为T的泛型类，它应该调用一个类型为T的具体化内联函数，以便能够更通用地使用Gson

class GenericNetworkService<RESPONSE_TYPE> {

    fun getDataFromServer(url: String): RESPONSE_TYPE {
        val request = Request.Builder().url(url).build()

        val response = OkHttpClient().newCall(request).execute()

        val convertor = Gson()

        val result: RESPONSE_TYPE = convertor.fromJson(response.body!!.string(), RESPONSE_TYPE)

        return result

    }
}

//calling
//fun main() {

//    val listOfPersons = GenericNetworkService<List<Person>>().getDataFromServer(url1)
//    println(listOfPersons)

//    val listOFTeacher = GenericNetworkService<List<Teacher>>().getDataFromServer(url2)
//    println(listOFTeacher)
// }

inline fun <reified T> fromJson(json: String): T {
   return Gson().fromJson(json, object: TypeToken<T>(){}.type)
}

//calling : 
// val data : List<Teacher> = fromJson(response)

private inline fun <reified RESPONSE_TYPE> getGenericRespSync(url: String): RESPONSE_TYPE {
    val okHttpClient = generateNetworkClient()
    val request = Request.Builder().url(url).build()
    val response: Response = okHttpClient.newCall(request).execute()

    val body: Reader = response.body!!.charStream()
    val finalResponse: RESPONSE_TYPE =  getConvertedListForResponse(body) //this is the same reified inline function as above with some non signinficant additions
    return finalResponse
}

但是我希望我的其他类通过某个类实例调用这个函数。例如，类似于genericNetworkService >().getGenericrespSync(url1) 应该返回列表，而不是直接调用getGenericrespSync(url1)。我如何实现这样的功能？

Answer 1

你可以定义

inline fun <reified RESPONSE_TYPE> GenericNetworkService<RESPONSE_TYPE>.getGenericRespSync1(url: String): RESPONSE_TYPE = getGenericRespSync<RESPONSE_TYPE>(url)

（我以不同的方式命名了这个函数，这样它就可以调用以前定义的getGenericrespSync)。当然，它只使用它调用的实例来获取它的类型参数，否则将忽略它。