JavaWeb开发经验谈:业务行为相似DAO接口的统一封装与使用

// 由于历史原因,我们的项目为每一个监控项都创建了对应的VO，// 这样很繁琐,但是对于分类维护监控项或在domain层次针对性地扩展某个监控项则是有利的// 如果你偏好贫血模型,那么可以尝试用一个CommonMonitorConfig描述所有publicabstractclassCommonMonitorConfig {
// 超阈值状态超过此时间,则进行报警StringkeepTime;
// 自上一次发送报警后的沉默周期StringsilenceTime;
// 此监控项是否启用报警BooleanisOpen;
// 监控项对应的字段名称StringmonitorName;
//  配置阈值Doublevalue;
//  产品类型,贫血模型需要此字段StringproductType;
//  充血模型可以定义此方法,让处于产品及的监控类例如EcsMonitorConfig实现此方法    abstractTypeEnumgetTypeEnum();
publicCommonMonitorConfig(){
// 如果使用充血模型,你可以分门别类的在构造方法中按类型初始化一些默认配置    }
}

publicclassCommonInsAlarmRule {
@TableIdpublicLongid;
/*** 规则编码*/publicStringruleUUID;
/*** 实例ID*/publicStringinstanceId;
publicStringmoduleCode;
}

/*** k: 产品类别* v: 报警规则实体类*/publicstaticfinalMap<TypeEnum, Class<?extendsCommonInsAlarmRule>>insClassMap=newImmutableMap.Builder<CloudProductTypeEnum, Class<?extendsCommonInsAlarmRule>>()
            .put(ECS, EcsAlarmRule.class)
            .put(EIP, EipAlarmRule.class)
            .put(RDS, RdsAlarmRule.class)
// ....            .build();
// 比方说,从上面的字典中获取insType,然后将其实例化为被标记为CommonInsAlarmRule的具体子类对象publicstatic<P, SextendsP>PnewInstance(Class<S>insType) {
try {
returninsType.newInstance();
        } catch (InstantiationException|IllegalAccessExceptione) {
        }
    }
// 这个方法直接定义在TypeEnum这个枚举类里publicstaticTypeEnumfindEnumByNameIgnoreCase(StringdisplayName){
returnArrays.stream(TypeEnum .values()).filter(e->e.displayName.equalsIgnoreCase(displayName)).findFirst().orElse(null);
    }

privatestaticMap<String, BaseMapper<?extendsCommonInsAlarmRule>>instanceAlarmRuleMapperMap;
privatefinalEcsAlarmRuleMapperecsAlarmRuleMapper;
privatefinalRdsAlarmRuleMapperrdsAlarmRuleMapper;
privatefinalEipAlarmRuleMappereipAlarmRuleMapper;
//.... @PostConstructvoidinit(){
instanceAlarmRuleMapperMap=newImmutableMap.Builder<TypeEnum, BaseMapper<?extendsCommonInsAlarmRule>>()
                .put(EcsAlarmRule.class.getName(), ecsAlarmRuleMapper)
                .put(EipAlarmRule.class.getName(), eipAlarmRuleMapper)
                .put(RdsAlarmRule.class.getName(), rdsAlarmRuleMapper)
// .....                .build();
}

importcom.baomidou.mybatisplus.core.mapper.BaseMapper;
importorg.springframework.stereotype.Repository;
@RepositorypublicinterfaceAbstractInsMapperextendsBaseMapper<CommonInsAlarmRule> {
}

publicstatic<TextendsCommonInsAlarmRule>BaseMapper<T>getInsAlarmRuleMapperByInsType(TypeEnumproductType) {
Class<T>clazz= (Class<T>) insClassMap.get(productType);
return (BaseMapper<T>) instanceAlarmRuleMapperMap.get(clazz.getName());
    }
publicstaticList<CommonInsAlarmRule>selectList(CloudProductTypeEnumproductType, LambdaQueryWrapper<CommonInsAlarmRule>wrapper) {
returngetInsAlarmRuleMapperByInsType(productType).selectList(wrapper);
    }
publicstaticCommonInsAlarmRuleselectOne(CloudProductTypeEnumproductType, LambdaQueryWrapper<CommonInsAlarmRule>wrapper) {
returngetInsAlarmRuleMapperByInsType(productType).selectOne(wrapper);
    }
publicintinsertOne(CloudProductTypeEnumproductType, CommonInsAlarmRulerule){
returngetInsAlarmRuleMapperByInsType(productType).insert(rule);
    }