apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/spring/common/bean/AnnotatedBean.java/AnnotatedBean/setBatch
class AnnotatedBean:  @Value("${batch:100}")
  public void setBatch(int batch) {
    logger.info("updating batch, old value: {}, new value: {}", this.batch, batch);
    this.batch = batch;
  }