/*
 * Copyright 2013-2019 the original author or authors.
 *
 * 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
 *
 *      https://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 demo;

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@FeignClient(name = "example", url = "example.com", fallback = FallbackClient.class)
interface UrlRestClient {

	@RequestMapping(value = "/", method = RequestMethod.GET)
	String hello();

}

@SpringBootApplication
@EnableFeignClients
public class FeignClientApplication {

	public static void main(String[] args) {
		SpringApplication.run(FeignClientApplication.class, args);
	}

	@Bean
	public ApplicationRunner runner(final UrlRestClient client) {
		return new ApplicationRunner() {

			@Override
			public void run(ApplicationArguments args) throws Exception {
				System.err.println(client.hello());
			}
		};
	}

}

@Component
class FallbackClient implements UrlRestClient {

	@Override
	public String hello() {
		return "oops";
	}

}
