/*
* Copyright (C) 2016 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.retrofit;
import java.io.IOException;
import okhttp3.HttpUrl;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.http.GET;
/**
* This example uses an OkHttp interceptor to change the target hostname dynamically at runtime.
* Typically this would be used to implement client-side load balancing or to use the webserver
* that's nearest geographically.
*/
public final class DynamicBaseUrl {
public interface Pop {
@GET("robots.txt")
Call<ResponseBody> robots();
}
static final class HostSelectionInterceptor implements Interceptor {
private volatile String host;
public void setHost(String host) {
this.host = host;
}
@Override public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
String host = this.host;
if (host != null) {
HttpUrl newUrl = request.url().newBuilder()
.host(host)
.build();
request = request.newBuilder()
.url(newUrl)
.build();
}
return chain.proceed(request);
}
}
public static void main(String... args) throws IOException {
HostSelectionInterceptor hostSelectionInterceptor = new HostSelectionInterceptor();
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.addInterceptor(hostSelectionInterceptor)
.build();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://www.coca-cola.com/")
.callFactory(okHttpClient)
.build();
Pop pop = retrofit.create(Pop.class);
Response<ResponseBody> response1 = pop.robots().execute();
System.out.println("Response from: " + response1.raw().request().url());
System.out.println(response1.body().string());
hostSelectionInterceptor.setHost("www.pepsi.com");
Response<ResponseBody> response2 = pop.robots().execute();
System.out.println("Response from: " + response2.raw().request().url());
System.out.println(response2.body().string());
}
}