解决并发不可重复领取的问题

@@ -12,6 +12,8 @@ public interface UserCouponMapper {
 
     int insert(UserCoupon record);
 
+    int insertWhere(UserCoupon record);
+
     int insertSelective(UserCoupon record);
 
     UserCoupon selectByUidAndToken(@Param("uid") Integer id, @Param("couponToken") String couponToken);

@@ -88,6 +88,20 @@
       #{orderCode,jdbcType=BIGINT}, #{useTime,jdbcType=INTEGER}, #{startTime,jdbcType=INTEGER}, 
       #{endTime,jdbcType=INTEGER}, #{createTime,jdbcType=INTEGER}, #{couponToken,jdbcType=VARCHAR})
   </insert>
+
+
+  <insert id="insertWhere" parameterType="com.yohoufo.dal.promotion.model.UserCoupon" >
+    insert into user_coupon (id, uid, coupon_id,
+    coupon_type, coupon_code, status,
+    order_code, use_time, start_time,
+    end_time, create_time,coupon_token)
+    select #{id,jdbcType=INTEGER}, #{uid,jdbcType=INTEGER}, #{couponId,jdbcType=INTEGER},
+    #{couponType,jdbcType=INTEGER}, #{couponCode,jdbcType=VARCHAR}, #{status,jdbcType=INTEGER},
+    #{orderCode,jdbcType=BIGINT}, #{useTime,jdbcType=INTEGER}, #{startTime,jdbcType=INTEGER},
+    #{endTime,jdbcType=INTEGER}, #{createTime,jdbcType=INTEGER}, #{couponToken,jdbcType=VARCHAR} from user_coupon
+    where not EXISTS (select 1 from user_coupon where uid=#{uid,jdbcType=INTEGER} and coupon_token=#{couponToken,jdbcType=VARCHAR})
+  </insert>
+
   <insert id="insertSelective" parameterType="com.yohoufo.dal.promotion.model.UserCoupon" >
     insert into user_coupon
     <trim prefix="(" suffix=")" suffixOverrides="," >

@@ -134,7 +134,7 @@ public class CouponServiceImpl implements ICouponService {
 
         if(!repeatable){
             // 校验是否可以领取(重复领取，时间是否合法，状态)
-            checkCanAcquire(uid, couponToken, couponAndType);
+//            checkCanAcquire(uid, couponToken, couponAndType);
         }
         // 校验 优惠券发放总数
         checkAndAddCouponSendNum(uid, couponToken);
@@ -150,7 +150,20 @@ public class CouponServiceImpl implements ICouponService {
             userCoupon.setStartTime(validityRange.lowerEndpoint());
             userCoupon.setEndTime(validityRange.upperEndpoint());
         }
-        int count = userCouponMapper.insert(userCoupon);
+
+        int count = 0;
+        // 不可重复
+        if (!repeatable){
+            count = userCouponMapper.insertWhere(userCoupon);
+        }else{
+            count = userCouponMapper.insert(userCoupon);
+        }
+
+        if (count == 0){
+            logger.info("can not repeatable acquire coupon. uid is {}, coupon is {}", uid, couponToken);
+            throw new ServiceException(ServiceError.PROMOTION_COUPON_HAS_RECEIVED);
+        }
+
         logger.info("senCoupon success,{},{},{},{}", uid, couponToken, couponCode, count);
         return couponCode;
     }