解决同一个用户可以并发领取纪念版nft的问题

joying-common/src/main/java/com/fzm/common/constant/RedisConstant.java

@@ -29,7 +29,7 @@ public class RedisConstant {
     /**
      * 纪念版nft领取成员列表
      */
-    public static final String COMMEMORATE_NFT_MEMBERS_PREFIX = "commemorateNft:members";
+    public static final String COMMEMORATE_NFT_MEMBERS_PREFIX = "commemorateNft:members:";
 
 
 

joying-common/src/main/java/com/fzm/common/service/impl/CommemorateNftServiceImpl.java

@@ -22,6 +22,7 @@ import com.fzm.common.utils.JsonUtil;
 import com.fzm.common.utils.RedisUtil;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
+import org.redisson.api.RLock;
 import org.redisson.api.RSemaphore;
 import org.redisson.api.RedissonClient;
 import org.springframework.beans.factory.annotation.Value;
@@ -103,11 +104,19 @@ public class CommemorateNftServiceImpl extends ServiceImpl<CommemorateNftMapper,
 
     @Override
     public Boolean receive(Integer id) {
+        User user = userService.getUserByToken();
+        // 加锁,避免一个用户可以并发领取
+        RLock lock = redisson.getLock("receive:nft:" + user.getId());
+        boolean tryLock = lock.tryLock();
+        if (!tryLock){
+            throw GlobalException.newException(ResultCode.RECEIVE_ERROR, "操作频繁");
+        }
+        try {
             CommemorateNft commemorateNft = getById(id);
             if (commemorateNft == null) {
                 throw GlobalException.newException(ResultCode.DATA_ERROR, "没找到此纪念版nft详情,请稍后再试");
             }
-        User user = userService.getUserByToken();
+
             // 先判断当前用户有没有领取过此纪念版nft
             if (redisUtil.sIsMember(RedisConstant.COMMEMORATE_NFT_MEMBERS_PREFIX + id, user.getId().toString())) {
                 throw GlobalException.newException(ResultCode.FAILED, "此纪念版nft每个用户只能领取一次");
@@ -153,6 +162,10 @@ public class CommemorateNftServiceImpl extends ServiceImpl<CommemorateNftMapper,
             // 领取完毕,把当前用户id加入到纪念版nft的领取记录中
             redisUtil.sAdd(RedisConstant.COMMEMORATE_NFT_MEMBERS_PREFIX + id, user.getId().toString());
             return true;
+        }  finally {
+              lock.unlock();
+        }
+
     }
 
     public static void main(String[] args) {