创建订单扣除库存

src/main/java/com/chaozhanggui/system/cashierservice/util/LockUtils.java

@@ -0,0 +1,35 @@
+package com.chaozhanggui.system.cashierservice.util;
+
+import cn.hutool.core.lang.UUID;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.RedisTemplate;
+
+import java.util.concurrent.TimeUnit;
+import java.util.function.Supplier;
+
+@Slf4j
+public class LockUtils {
+
+    public static<T> T runFunAndCheckKey(Supplier<T> supplier, RedisTemplate<String, Object> redisTemplate, String lockKey)  {
+        try{
+            // 创建线程id, 用作判断
+            String clientId = UUID.randomUUID().toString();
+            // 设置分布式锁
+            boolean lock = Boolean.TRUE.equals(redisTemplate.opsForValue().setIfAbsent(lockKey, clientId, 30, TimeUnit.SECONDS));
+            int count = 0;
+            while (!lock) {
+                if (count++ > 100) {
+                    throw new RuntimeException("系统繁忙, 稍后再试");
+                }
+                Thread.sleep(20);
+                lock = Boolean.TRUE.equals(redisTemplate.opsForValue().setIfAbsent(lockKey, clientId, 30, TimeUnit.SECONDS));
+            }
+            return supplier.get();
+        } catch (Exception e){
+            log.info("执行出错：{}", e.getMessage());
+            throw new RuntimeException(e.getMessage());
+        }finally{
+            redisTemplate.delete(lockKey);
+        }
+    }
+}