org.springframework.cloud.sleuth.instrument.web.client.feign.TraceFeignClientAutoConfiguration

/**
 * {@link org.springframework.boot.autoconfigure.EnableAutoConfiguration
 * Auto-configuration} enables span information propagation when using Feign.
 *
 * @author Marcin Grzejszczak
 * @since 1.0.0
 */
@Configuration
@ConditionalOnProperty(value = "spring.sleuth.feign.enabled", matchIfMissing = true)
@ConditionalOnClass(Client.class)
@ConditionalOnBean(Tracer.class)
@AutoConfigureBefore(FeignAutoConfiguration.class)
@AutoConfigureAfter({SleuthHystrixAutoConfiguration.class, TraceWebAutoConfiguration.class})
public class TraceFeignClientAutoConfiguration {

@Bean
    @Scope("prototype")
    @ConditionalOnClass(name = "com.netflix.hystrix.HystrixCommand")
    @ConditionalOnProperty(name = "feign.hystrix.enabled", matchIfMissing = true)
    Feign.Builder feignHystrixBuilder(BeanFactory beanFactory) {
        return SleuthHystrixFeignBuilder.builder(beanFactory);
    }

@Bean
    @ConditionalOnMissingBean
    @Scope("prototype")
    @ConditionalOnProperty(name = "feign.hystrix.enabled", havingValue = "false", matchIfMissing = false)
    Feign.Builder feignBuilder(BeanFactory beanFactory) {
        return SleuthFeignBuilder.builder(beanFactory);
    }

@Configuration
    @ConditionalOnProperty(name = "spring.sleuth.feign.processor.enabled", matchIfMissing = true)
    protected static class FeignBeanPostProcessorConfiguration {

@Bean
        FeignBeanPostProcessor feignBeanPostProcessor(TraceFeignObjectWrapper traceFeignObjectWrapper) {
            return new FeignBeanPostProcessor(traceFeignObjectWrapper);
        }

@Bean
        FeignContextBeanPostProcessor feignContextBeanPostProcessor(BeanFactory beanFactory) {
            return new FeignContextBeanPostProcessor(beanFactory);
        }
    }

@Bean
    TraceFeignObjectWrapper traceFeignObjectWrapper(BeanFactory beanFactory) {
        return new TraceFeignObjectWrapper(beanFactory);
    }
}

org.springframework.cloud.netflix.feign.FeignClientsConfiguration\

@Configuration
public class FeignClientsConfiguration {

org.springframework.cloud.netflix.feign.FeignAutoConfiguration

@Configuration
@ConditionalOnClass(Feign.class)
public class FeignAutoConfiguration {