Changes

service/src/main/java/com/hfkj/service/goods/GoodsMsgService.java

@@ -82,6 +82,6 @@ public interface GoodsMsgService {
      * @param num
      * @return
      */
-    void addSaleNum(Long goodsId , Integer num);
+    void addSaleNum(Long goodsId , Integer num) throws Exception;
 
 }

service/src/main/java/com/hfkj/service/goods/impl/GoodsMsgServiceImpl.java

@@ -7,6 +7,8 @@ import com.hfkj.entity.GoodsMsgExample;
 import com.hfkj.service.goods.GoodsMsgService;
 import org.apache.commons.collections4.MapUtils;
 import org.apache.commons.lang3.StringUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
@@ -21,6 +23,9 @@ public class GoodsMsgServiceImpl implements GoodsMsgService {
     @Resource
     private GoodsMsgMapper goodsMsgMapper;
 
+    @Autowired
+    private RedisTemplate redisTemplate;
+
     @Override
     public void create(GoodsMsg goodsMsg) {
         goodsMsgMapper.insert(goodsMsg);
@@ -96,12 +101,27 @@ public class GoodsMsgServiceImpl implements GoodsMsgService {
     }
 
     @Override
-    public void addSaleNum(Long goodsId, Integer num) {
+    public void addSaleNum(Long goodsId, Integer num) throws Exception {
+
+        String key = "GOODS" + goodsId;
+
+        // 分布式锁占坑
+        Boolean lock = redisTemplate.opsForValue().setIfAbsent(key, goodsId);
+
         GoodsMsg goodsMsg = queryDetail(goodsId);
 
         if (goodsMsg != null) {
-            goodsMsg.setSaleNum(goodsMsg.getSaleNum() + num);
+
-            update(goodsMsg);
+            if(Boolean.TRUE.equals(lock)) {
+                goodsMsg.setSaleNum(goodsMsg.getSaleNum() + num);
+                update(goodsMsg);
+            } else {
+                // 加锁失败，重试
+                Thread.sleep(100);
+                addSaleNum(goodsId , num);
+            }
+
+
         }
 
     }