@Bean
	@ConditionalOnMissingBean
	@ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
	@ConditionalOnProperty(name = "resttemplate.sentinel.enabled", havingValue = "true",
			matchIfMissing = true)
	public static SentinelBeanPostProcessor sentinelBeanPostProcessor(
			ApplicationContext applicationContext) {
		return new SentinelBeanPostProcessor(applicationContext);
	}
@author xiaojing
@author jiashuai.xie
@author <a href="mailto:fangjian0423@gmail.com">Jim</a>
@author freeman
spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-sentinel/src/main/java/com/alibaba/cloud/sentinel/custom/SentinelAutoConfiguration.java