如何使用 Retrofit / OkHttp 更快地发出并发请求？

Question

我需要使用 Android 中的 Retrofit 尽快发出 50 个 http GET 请求。 我正在使用带有 OkHttp 的 Retrofit。 Currently Retrofit is doing a poor job vs plain Java ThreadPoolExecutor and HttpUrlConnection : about 50sec for Retrofit and 30sec for plain HttpUrlConnection for all 50 requests, if I set the pool size 20 for ThreadPoolExecutor and for Retrofit / OkHttp I set okHttpClient.dispatcher().setMaxRequests(20); .

如果我查看 logcat，我可以看到 Retrofit 最多执行 5 个并发请求，无论我在setMaxRequests()中设置什么，而使用ThreadPoolExecutor时，并发请求的数量与可用的工作线程一样多。

我能做些什么来让 Retrofit 更快吗？ 我不想切换到HttpUrlConnection因为 Retrofit 是如此优雅且易于使用。

编辑 1

我尝试向 OkHttp 提供自定义ThreadPoolExecutor但没有时间改进：

OkHttpClient.Builder builder = new OkHttpClient.Builder();
ExecutorService exec = new ThreadPoolExecutor(20, 20, 1, TimeUnit.HOURS, new LinkedBlockingQueue<>());
Dispatcher d = new Dispatcher(exec);
builder.dispatcher(d);
OkHttpClient okHttpClient = builder.build();
okHttpClient.dispatcher().setMaxRequests(20);

编辑 2

如果这很重要，我会向同一个端点发出所有请求

Answer 1

既然他们都去了同一个主人，你试过：

okHttpClient.dispatcher().setMaxRequestsPerHost(20);

Dispatcher.setMaxRequestsPerHost

Answer 2

dispatcher.maxRequests = 20和dispatcher.maxRequestsPerHost = 20都为我完成了这项工作

以一些 Kotlin 为例

package com.package



/**
 * Created by touhid on 24/Jan/2022.
 */
object NetworkService {

    private val interceptor = HttpLoggingInterceptor().apply {
        apply { level = HttpLoggingInterceptor.Level.BODY }
    }
    private val okClient = OkHttpClient.Builder()
        .addInterceptor { chain ->

            val token = getToken(chain)
            var newRequest = chain.request().newBuilder()
            token?.let {
                newRequest = newRequest.addHeader("Authorization", "Bearer $it")
                newRequest = newRequest.addHeader("Accept", "application/json")
            }
            chain.proceed(newRequest.build())
        }
        .addInterceptor(interceptor)

        .build().also {
            it.dispatcher.maxRequests = 20
            it.dispatcher.maxRequestsPerHost = 20
        }


    private val retrofit = Retrofit.Builder()
        .client(okClient)
        .baseUrl(Constants.baseUrl)
        .addConverterFactory(GsonConverterFactory.create())
        .build()

    val service: myApiService = retrofit.create(FoodicsApi::class.java)

    

}