OKHttp源码解析(5)----拦截器ConnectInterceptorOpens a connection to

系列文章

1.简介

Opens a connection to the target server and proceeds to the next interceptor.

连接拦截器，负责和服务器建立连接

2.源码解析

  @Override public Response intercept(Chain chain) throws IOException {
    RealInterceptorChain realChain = (RealInterceptorChain) chain;
    Request request = realChain.request();
    StreamAllocation streamAllocation = realChain.streamAllocation();

    // We need the network to satisfy this request. Possibly for validating a conditional GET.
    boolean doExtensiveHealthChecks = !request.method().equals("GET");
     //在连接池中找个可用的链接，并创建HttpCodec
    HttpCodec httpCodec = streamAllocation.newStream(client, doExtensiveHealthChecks);
    RealConnection connection = streamAllocation.connection();

    return realChain.proceed(request, streamAllocation, httpCodec, connection);
  }

连接拦截器的代码比较简单，主要是将网络设置组合起来，给下一个拦截器----CallServerInterceptor，用于向服务器发起真正的网络请求。这些网络设施主要有request(请求)、streamAllocation(网络设施，可以获取HttpCodec和RealConnection)、HttpCodec(htt编解码器)和RealConnection(连接)

实际的网络请求可以在拦截器CallServerInterceptor查看。

小结

未完待续。