HttpLoggingInterceptor不记录

Question

我遇到了HttpLoggingInterceptor奇怪的行为。 我注意到，如果我使用newBuilder（），则日志记录将无法正常工作。

// instantiate object (in app)
val okHttpRequestManager: HttpRequestManager = OkHttpRequestManager(OkHttpClient(), null)

// execute request (in app)
okHttpRequestManager.execute(request, callback)


// another class (in request module)
open class OkHttpRequestManager(private val client: OkHttpClient,
                                 private val httpLoggingInterceptor: HttpLoggingInterceptor?) : HttpRequestExecutor {


    override fun execute(httpRequest: HttpRequest, callback: HttpResponseCallback?) {

        if (httpLoggingInterceptor != null) {
            client.newBuilder().addInterceptor(httpLoggingInterceptor).build()
        }

        // perform request below
        ...
    }
}

上面的代码段不起作用。 但是，如果我将参数设为构建器，则一切正常。 使用newBuilder（）是执行此操作的错误方法吗？

// the below works
// another class (in request module)
open class OkHttpRequestManager(private val client: OkHttpClient.Builder,
                                 private val httpLoggingInterceptor: HttpLoggingInterceptor?) : HttpRequestExecutor {


    override fun execute(httpRequest: HttpRequest, callback: HttpResponseCallback?) {

        if (httpLoggingInterceptor != null) {
            // no newBuilder() or build() and works like a charm
            client.addInterceptor(httpLoggingInterceptor) 
        }

        // perform request below
        ...
    }
}

任何人都知道为什么会这样吗？

Answer 1

这是因为名称中暗示的方法newBuilder()返回了新的构建器对象，并且当您对其调用build()时，将返回从新的构建器创建的OkHttpClient新实例。

这是源代码：

/** Prepares the [request] to be executed at some point in the future. */
  override fun newCall(request: Request): Call {
    return RealCall.newRealCall(this, request, forWebSocket = false)
  }

build()方法

fun build(): OkHttpClient = OkHttpClient(this)

newBuilder将添加到现有客户端的属性中，因此您将拥有一个具有旧属性和新属性的新客户端。

如果要使用newBuilder()方法，则需要使用新创建的OkHttpClient 。

// another class (in request module)
open class OkHttpRequestManager(private val client: OkHttpClient,
                                 private val httpLoggingInterceptor: HttpLoggingInterceptor?) : HttpRequestExecutor {


    override fun execute(httpRequest: HttpRequest, callback: HttpResponseCallback?) {

        if (httpLoggingInterceptor != null) {
            val newClient = client.newBuilder().addInterceptor(httpLoggingInterceptor).build()
        }

        // perform request below using newClient
        ...
    }
}