springCloud Feign 异步调用远程服务DEMO
springCloud Feign 异步调用远程服务1. Feign APIpackage com.sande.configserver.api;import java.util.concurrent.CompletableFuture;import org.springframework.cloud.openfeign.FeignClient;import org.springframework
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springCloud Feign 异步调用远程服务
1. Feign API
package com.sande.configserver.api;
import java.util.concurrent.CompletableFuture;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import com.netflix.hystrix.HystrixCommand;
import feign.hystrix.HystrixFeign;
import io.netty.util.concurrent.Future;
@FeignClient(value = "user-server", fallback = UserApiFeignHystrix.class)
public interface UserApi {
@PostMapping(value="/user/getByTokenUser")
//CompletableFuture<User> getByTokenUser(@RequestParam("token") String token);
HystrixCommand<User> getByTokenUser(@RequestParam("token") String token);
}
2. 实现服务降级的类
package com.sande.configserver.api;
import static org.hamcrest.CoreMatchers.nullValue;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.springframework.stereotype.Component;
import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;
import com.netflix.hystrix.HystrixCommand.Setter;
import com.netflix.hystrix.contrib.javanica.utils.FutureDecorator;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import net.bytebuddy.asm.Advice.Return;
@Component
public class UserApiFeignHystrix implements UserApi {
private static final Setter hystrixCommandGroupKey =
Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey("UserApi"));
@Override
public HystrixCommand<User> getByTokenUser(final String token) {
return new HystrixCommand<User>(hystrixCommandGroupKey) {
@Override
protected User run() throws Exception {
// TODO Auto-generated method stub
System.out.println("Feign 服务异步调用服务降级");
User user = new User();
user.setPhone("13811111111");
user.setUserName("lixia");
return user;
}
};
}
}
3. 服务调用方(消费端)的 Controller
package com.sande.configserver.api;
import static org.assertj.core.api.Assertions.setLenientDateParsing;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import feign.hystrix.HystrixFeign;
@RestController
public class UserController {
@Resource UserApi userApi;
@RequestMapping(value="/getByTokenUser")
public User getByTokenUser(HttpServletRequest request,HttpServletResponse response) throws InterruptedException, ExecutionException {
String token ="token_cef257c4db1d456fbea00f1e8a50b3b0";
Future<User> future = userApi.getByTokenUser(token).queue();
return future.get();
}
}
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