策略模式--应用

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抽象策略父类<br>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：

　　

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@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：

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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);