SpringCloud @FeignClient参数的用法解析

@FeignClient (name = "service-name" , url = "${feign.urls.service-name:}" , fallback =ApiFallBack. class ,configuration = Interceptor. class )

@FeignClient (name = "service-name" , fallbackFactory = HystrixClientFallbackFactory. class )

protected interface HystrixClient {

@RequestMapping (method = RequestMethod.GET, value = "/test" )

            Hello iFailSometimes();

  }

@Component

static class HystrixClientFallbackFactory implements FallbackFactory<HystrixClient> {

@Override

public HystrixClient create(Throwable cause) {

return new HystrixClientWithFallBackFactory() {

@Override

public Hello iFailSometimes() {

return new Hello( "fallback; reason was: " + cause.getMessage());

}

};

}

}

/**

  * Annotation for interfaces declaring that a REST client with that interface should be

  * created (e.g. for autowiring into another component). If ribbon is available it will be

  * used to load balance the backend requests, and the load balancer can be configured

  * using a <code>@RibbonClient</code> with the same name (i.e. value) as the feign client.

  *

  * @author Spencer Gibb

  * @author Venil Noronha

  */

@Target (ElementType.TYPE)

@Retention (RetentionPolicy.RUNTIME)

@Documented

public @interface FeignClient {

    /**

     * The name of the service with optional protocol prefix. Synonym for {@link #name()

     * name}. A name must be specified for all clients, whether or not a url is provided.

     * Can be specified as property key, eg: ${propertyKey}.

     */

    @AliasFor ( "name" )

    String value() default "" ;

    /**

     * The service id with optional protocol prefix. Synonym for {@link #value() value}.

     *

     * @deprecated use {@link #name() name} instead

     */

    @Deprecated

    String serviceId() default "" ;

    /**

     * The service id with optional protocol prefix. Synonym for {@link #value() value}.

     */

    @AliasFor ( "value" )

    String name() default "" ;

    /**

     * Sets the <code>@Qualifier</code> value for the feign client.

     */

    String qualifier() default "" ;

    /**

     * An absolute URL or resolvable hostname (the protocol is optional).

     */

    String url() default "" ;

    /**

     * Whether 404s should be decoded instead of throwing FeignExceptions

     */

    boolean decode404() default false ;

    /**

     * A custom <code>@Configuration</code> for the feign client. Can contain override

     * <code>@Bean</code> definition for the pieces that make up the client, for instance

     * {@link feign.codec.Decoder}, {@link feign.codec.Encoder}, {@link feign.Contract}.

     *

     * @see FeignClientsConfiguration for the defaults

     */

    Class<?>[] configuration() default {};

    /**

     * Fallback class for the specified Feign client interface. The fallback class must

     * implement the interface annotated by this annotation and be a valid spring bean.

     */

    Class<?> fallback() default void . class ;

    /**

     * Define a fallback factory for the specified Feign client interface. The fallback

     * factory must produce instances of fallback classes that implement the interface

     * annotated by {@link FeignClient}. The fallback factory must be a valid spring

     * bean.

     *

     * @see feign.hystrix.FallbackFactory for details.

     */

    Class<?> fallbackFactory() default void . class ;

    /**

     * Path prefix to be used by all method-level mappings. Can be used with or without

     * <code>@RibbonClient</code>.

     */

    String path() default "" ;

    /**

     * Whether to mark the feign proxy as a primary bean. Defaults to true.

     */

    boolean primary() default true ;

}

@FeignClient (value = "annoroad-alpha" ,  url = "${annoroad.ms.annoroad-alpha.url}" )

public interface UserFacade {

     @PostMapping (value = "/user/detail" )

     UserDto detail( @RequestParam ( "id" ) long id);

}