策略模式--应用

抽象策略父类
public abstract class AbstractOrderProofreadHandler {

    public AbstractOrderProofreadHandler() {
        OrderProofreadHandlerManager.putInstance(getChannelCode(), this);
    }


  
    public abstract ImportOrderBusinessResp proofreadOrder(String billCycle, Long hotelVid, List<TitcBussinessOrderBill> list);
    
    //策略名称
  
    public abstract int getChannelCode();

    /**
     * 拼接字符串
     *
     * @param strs
     * @return
     */
    protected String concat(Object... strs) {

        StringBuilder sb = new StringBuilder();
        for (Object str : strs) {
            sb.append(str);
        }
        return sb.toString();
    }
}    

　策略子类，实现父类方法：

　　

@Slf4j
@Component
public class YilonghuiOrderHandler extends AbstractOrderProofreadHandler {


    /**
     * 校验--PMS订单编码、活动优惠金额（艺龙会承担成本）、活动优惠金额（门店承担成本）、实付房费
     *
     * @param file
     * @return
     */
    @Override
    public CheckImportOrderResultDto checkImportFileData(MultipartFile file) {
        
        return resp;
    }

    @Override
    public ImportOrderBusinessResp proofreadOrder(String billCycle, Long hotelVid, List<TitcBussinessOrderBill> list) {
       
        return resp;
    }

    /**
     * 艺龙会-12  、住哲-14   、同程艺龙-9
     *
     * @return
     */
    @Override
    public int getChannelCode() {
        return 12;
    }
}

　加载策略：

public class OrderProofreadHandlerManager {

    private static Map<Integer, AbstractOrderProofreadHandler> instance = new HashMap<>();

    /**
     * put
     *
     * @param channelCode 渠道名称
     * @param handler     处理类
     */
    public static void putInstance(Integer channelCode, AbstractOrderProofreadHandler handler) {

        instance.put(channelCode, handler);
    }

    /**
     * get
     *
     * @param channelCode 表名
     * @return
     */
    public static AbstractOrderProofreadHandler getInstance(Integer channelCode) {

        if (Objects.isNull(channelCode)) {
            return null;
        }
        return instance.get(channelCode);
    }

    public static Map<Integer, AbstractOrderProofreadHandler> getAllInstance() {
        return instance;
    }
}

　　使用场景：

//根据billchannel选择策略

AbstractOrderProofreadHandler orderProofreadHandler = OrderProofreadHandlerManager.getInstance(billChannel);