Retrofit2.0源码流程备忘记录

1、Retrofit.create(Class service)会创建一个动态代理的对象。

return (T) Proxy.newProxyInstance(service.getClassLoader(), new Class<?>[] { service },        new InvocationHandler() {          private final Platform platform = Platform.get();          @Override public Object invoke(Object proxy, Method method, Object... args)              throws Throwable {            // If the method is a method from Object then defer to normal invocation.            if (method.getDeclaringClass() == Object.class) {              return method.invoke(this, args);            }            if (platform.isDefaultMethod(method)) {              return platform.invokeDefaultMethod(method, service, proxy, args);            }            ServiceMethod serviceMethod = loadServiceMethod(method);            OkHttpCall okHttpCall = new OkHttpCall<>(serviceMethod, args);            return serviceMethod.callAdapter.adapt(okHttpCall);          }        });

 public interface CategoryService {       @POST("category/{cat}/")       Call<List<Item>> categoryList(@Path("cat") String a, @Query("page") int b);     }

1）默认情况下，会调用serviceMethod.callAdapter.adapt(okHttpCall);通过callAdapter使用代理模式将okHttpCall对象转化为call代理对象callProxy。
2）然后用户调用callProxy对象的enqueue或者execute等方法，callProxy对象会调用它所代理的okHttpCall这个realCall对象。
3）realCall对象会调用serviceMethod的toRequest方法生成一个Okhttp包里面的实际请求，请求返回后再调用Converter将返回结果转化为实际想要的返回结果