中奖记录设计(策略+模板)

背景

最近需求要做一个活动需求,用户只要参与活动就可以获得奖励,奖励分为以下几种:

创角奖励: 用户在活动内的游戏创建角色即可中奖

等级奖励: 角色在游戏内级别达到某一个级别即可中奖

VIP级别奖励: 角色在游戏内VIP级别达到某一个级别即可中奖

排行榜奖励: 角色某一天充值榜一即可中奖

如果按照传统的做法,就是每种中奖内部去进行判断逻辑,比如角色是没有啥条件的,等级是需要达到指定的等级,VIP需要达到指定的VIP级别等

可能代码中就会存在大量的判断逻辑,而且前置逻辑都差不多,所以才会考虑用设计模式来进行处理

具体实现

设计图

代码逻辑实现

接口

public interface RebateActivityRecordHandler {RebateActivityRecordHandlerVo handler(Long userRoleId);RebateActivityPrizeSendTypeEnum getRebatePrizeSendType();
}

抽象类(核心)

@Slf4j
public abstract class AbstractRebateActivityRecordHandler implements RebateActivityRecordHandler{@Resourceprivate IRebateActivityAttendUserService rebateActivityAttendUserService;@Resource@Lazyprivate IRebateActivityRoleRecordService rebateActivityRoleRecordService;@Resourceprivate UserRoleService userRoleService;@Overridepublic RebateActivityRecordHandlerVo handler(Long userRoleId) {RebateActivityRecordHandlerVo handlerVo = new RebateActivityRecordHandlerVo();UserRole userRole = userRoleService.getUserRole(userRoleId);if(userRole == null) {log.info("id为{}的角色不存在", userRoleId);return handlerVo;}//获取角色参与了哪个活动RebateActivityAttendUser rebateActivityAttendUser = rebateActivityAttendUserService.queryByRoleId(userRoleId);if(rebateActivityAttendUser == null) {log.info("roleId为 {} 没有参与任何一个活动,直接返回", userRoleId);return handlerVo;}//角色在某个活动内关联的数据List<RebateActivityRoleRecord> rebateActivityRoleRecordList = rebateActivityRoleRecordService.queryList(rebateActivityAttendUser.getRebateActivityId(), doGetRebatePrizeSendType(), userRoleId, userRole.getAppNumber());//调用模板方法进行真正的校验处理等return doHandler(userRole, rebateActivityAttendUser, rebateActivityRoleRecordList);}@Overridepublic RebatePrizeSendTypeEnum getRebatePrizeSendType() {return doGetRebatePrizeSendType();}protected abstract RebatePrizeSendTypeEnum doGetRebatePrizeSendType();protected abstract RebateActivityRecordHandlerVo doHandler(UserRole userRole, RebateActivityAttendUser rebateActivityAttendUser, List<RebateActivityRoleRecord> rebateActivityRoleRecordList);
}

主要就是doHandler方法,下面看下其中一个实现类

创角奖励

@Service
@Slf4j
public class RebateActivityCreateRoleRecordHandler extends AbstractRebateActivityRecordHandler {@Overrideprotected RebatePrizeSendTypeEnum doGetRebatePrizeSendType() {return RebatePrizeSendTypeEnum.CREATE_ROLE;}@Overrideprotected RebateActivityRecordHandlerVo doHandler(UserRole userRole, RebateActivityAttendUser rebateActivityAttendUser, List<RebateActivityRoleRecord> rebateActivityRoleRecordList) {RebateActivityRecordHandlerVo recordHandlerVo = new RebateActivityRecordHandlerVo();if(rebateActivityRoleRecordList.size() >= RebateActivityGameConst.RECORD_COUNT) {log.info("活动创角奖励只能有 {} 个, 角色id为{}, 活动id为{}, 超出了直接返回", RebateActivityGameConst.RECORD_COUNT, userRole.getId(),null);return recordHandlerVo;}//创角奖励目前只有这个校验,如有其他的再加入RebateActivityRoleRecord rebateActivityRoleRecord = buildBaseRecord(userRole, rebateActivityAttendUser);recordHandlerVo.setSuccess(true);recordHandlerVo.setNeedSaveList(Collections.singletonList(rebateActivityRoleRecord));return recordHandlerVo;}
}

实现自己所需要的逻辑即可,其他的几种也是类似的,最后还有个上下文,如下

上下文

@Slf4j
@Component
public class RebateActivityRecordHandlerContext implements InitializingBean {@Resourceprivate List<RebateActivityRecordHandler> recordHandlerList;private Map<RebatePrizeSendTypeEnum, RebateActivityRecordHandler> recordHandlerMap;@Overridepublic void afterPropertiesSet() throws Exception {recordHandlerMap = new ConcurrentHashMap<>();RebatePrizeSendTypeEnum[] sendTypeEnums = RebatePrizeSendTypeEnum.values();for (RebatePrizeSendTypeEnum sendTypeEnum : sendTypeEnums) {recordHandlerMap.put(sendTypeEnum, query(sendTypeEnum));}}private RebateActivityRecordHandler query(RebatePrizeSendTypeEnum prizeSendType) {for (RebateActivityRecordHandler rebateActivityRecordHandler : recordHandlerList) {if(Objects.equals(rebateActivityRecordHandler.getRebatePrizeSendType(), prizeSendType)) {return rebateActivityRecordHandler;}}throw new IllegalArgumentException("类型为 " + prizeSendType.getDesc() + " 没有处理类,请参考RebatePrizeSendTypeEnum");}private RebateActivityRecordHandler assertHandler(RebatePrizeSendTypeEnum prizeSendType) {RebateActivityRecordHandler recordHandler = recordHandlerMap.get(prizeSendType);if(recordHandler == null) {throw new AppException(ErrorCode.SYS_ERROR.code(), "找不到活动中奖类型的处理类,类型为" + prizeSendType.getDesc());}return recordHandler;}public RebateActivityRecordHandlerVo handleRebateActivityRecord(Long userRoleId, RebatePrizeSendTypeEnum prizeSendType) {return assertHandler(prizeSendType).handler(userRoleId);}
}

注:这个类其实也可以不要,只是习惯性会用这么个东西,而且利用了spring的初始化方法来判断是否所有奖励类型都有对应的处理类,还是有意义的

备注:这个设计跟我另一篇文章很类似,如下,状态模式的

活动功能-＞状态模式的使用_活动状态模式代码-CSDN博客