复杂代码方法论

金字塔原理

可以使用结构化分解将问题解构成一个有层级的金字塔结:

@Command
public class OnSaleNormalItemCmdExe {

    @Resource
    private OnSaleContextInitPhase onSaleContextInitPhase;
    @Resource
    private OnSaleDataCheckPhase onSaleDataCheckPhase;
    @Resource
    private OnSaleProcessPhase onSaleProcessPhase;

    @Override
    public Response execute(OnSaleNormalItemCmd cmd) {

        OnSaleContext onSaleContext = init(cmd);

        checkData(onSaleContext);

        process(onSaleContext);

        return Response.buildSuccess();
    }

    private OnSaleContext init(OnSaleNormalItemCmd cmd) {
        return onSaleContextInitPhase.init(cmd);
    }

    private void checkData(OnSaleContext onSaleContext) {
        onSaleDataCheckPhase.check(onSaleContext);
    }

    private void process(OnSaleContext onSaleContext) {
        onSaleProcessPhase.process(onSaleContext);
    }
}

@Phase
public class OnSaleProcessPhase {

    @Resource
    private PublishOfferStep publishOfferStep;
    @Resource
    private BackOfferBindStep backOfferBindStep;
    //省略其它step

    public void process(OnSaleContext onSaleContext){
        SupplierItem supplierItem = onSaleContext.getSupplierItem();

        // 生成OfferGroupNo
        generateOfferGroupNo(supplierItem);

       // 发布商品
        publishOffer(supplierItem);

        // 前后端库存绑定 backoffer域
        bindBackOfferStock(supplierItem);

        // 同步库存路由 backoffer域
        syncStockRoute(supplierItem);

        // 设置虚拟商品拓展字段
        setVirtualProductExtension(supplierItem);

        // 发货保障打标 offer域
        markSendProtection(supplierItem);

        // 记录变更内容ChangeDetail
        recordChangeDetail(supplierItem);

        // 同步供货价到BackOffer
        syncSupplyPriceToBackOffer(supplierItem);

        // 如果是组合商品打标，写扩展信息
        setCombineProductExtension(supplierItem);

        // 去售罄标
        removeSellOutTag(offerId);

        // 发送领域事件
        fireDomainEvent(supplierItem);

        // 关闭关联的待办事项
        closeIssues(supplierItem);
    }
}