负载均衡深度改造，增加分布式锁，表唯一约束等

easyflow-commons/easyflow-common-cache/src/main/java/tech/easyflow/common/cache/RedisLockExecutor.java

@@ -0,0 +1,80 @@
+package tech.easyflow.common.cache;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.core.script.DefaultRedisScript;
+import org.springframework.stereotype.Component;
+
+import java.time.Duration;
+import java.util.Collections;
+import java.util.UUID;
+import java.util.function.Supplier;
+
+@Component
+public class RedisLockExecutor {
+
+    private static final Logger log = LoggerFactory.getLogger(RedisLockExecutor.class);
+
+    private static final long RETRY_INTERVAL_MILLIS = 50L;
+
+    private static final DefaultRedisScript<Long> RELEASE_LOCK_SCRIPT;
+
+    static {
+        RELEASE_LOCK_SCRIPT = new DefaultRedisScript<>();
+        RELEASE_LOCK_SCRIPT.setScriptText(
+                "if redis.call('get', KEYS[1]) == ARGV[1] then " +
+                        "return redis.call('del', KEYS[1]) " +
+                        "else return 0 end"
+        );
+        RELEASE_LOCK_SCRIPT.setResultType(Long.class);
+    }
+
+    @Autowired
+    private StringRedisTemplate stringRedisTemplate;
+
+    public void executeWithLock(String lockKey, Duration waitTimeout, Duration leaseTimeout, Runnable task) {
+        executeWithLock(lockKey, waitTimeout, leaseTimeout, () -> {
+            task.run();
+            return null;
+        });
+    }
+
+    public <T> T executeWithLock(String lockKey, Duration waitTimeout, Duration leaseTimeout, Supplier<T> task) {
+        String lockValue = UUID.randomUUID().toString();
+        boolean acquired = false;
+        long deadline = System.nanoTime() + waitTimeout.toNanos();
+        try {
+            while (System.nanoTime() <= deadline) {
+                Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(lockKey, lockValue, leaseTimeout);
+                if (Boolean.TRUE.equals(success)) {
+                    acquired = true;
+                    break;
+                }
+                Thread.sleep(RETRY_INTERVAL_MILLIS);
+            }
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IllegalStateException("等待分布式锁被中断，lockKey=" + lockKey, e);
+        }
+
+        if (!acquired) {
+            throw new IllegalStateException("获取分布式锁失败，请稍后重试，lockKey=" + lockKey);
+        }
+
+        try {
+            return task.get();
+        } finally {
+            releaseLock(lockKey, lockValue);
+        }
+    }
+
+    private void releaseLock(String lockKey, String lockValue) {
+        try {
+            stringRedisTemplate.execute(RELEASE_LOCK_SCRIPT, Collections.singletonList(lockKey), lockValue);
+        } catch (Exception e) {
+            log.warn("释放分布式锁失败，lockKey={}", lockKey, e);
+        }
+    }
+}