java 回调写法

有许多是共有的逻辑，但中间穿插着不同逻辑，怎么相对简洁的实现呢？

1.定义模板类

public class DemandRelationTemplate {/*** 模版方法* REQUIRED：支持当前事务，如果当前没有事务，就新建一个事务。这是最常见的选择。*/@Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)public BusinessReleaseBatch template(final DemandRelationDto demandRelationDto, CallBack<BusinessReleaseBatch> callBack) {//检查参数(共同逻辑)checkArgument(demandRelationDto);//回调方法（不一样的逻辑）BusinessReleaseBatch releaseBatch = callBack.doCallBack();//数据更新（共同逻辑）this.updateExtend(demandRelationDto, releaseBatch);//更新数据this.updateDemand(demandRelationDto);return releaseBatch;}/*** 检查参数*/private void checkArgument(DemandRelationDto demandRelationDto) {Preconditions.checkArgument(demandRelationDto != null, "请求不能为空");}private void updateDemand(){DemandRelationDto demandRelationDto}}

调用模板方法：

demandRelationTemplate.template(demandRelationDto, () ->this.submitReleaseApplication(businessIdentityChild, versionManageEntity, erp, martrixSiteEnum));

执行过程：1.调用template方法，执行逻辑 checkArgument(demandRelationDto)

                  2.回调执行submitReleaseApplication(businessIdentityChild, versionManageEntity, erp, martrixSiteEnum)

                  3.执行template中后续逻辑：
this.updateExtend(demandRelationDto, releaseBatch);
this.updateDemand(demandRelationDto);