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package com.meisoo.clearingplat.config;import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;import javax.annotation.PostConstruct;
import java.util.Collections;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;/*** IdUtil.getSnowflake(SnowflakeConfig.staticWorkerId).nextId()* @author Hj* @date 2025/11/20*/
@Slf4j
@Configuration
public class SnowflakeConfig {public static Integer staticWorkerId;@Value("${spring.application.name}")private String appName;@Autowiredprivate RedisTemplate redisTemplate;private String WORKER_ID_KEY = ":snowflake:workerids";private String WORKER_ID_LOCK_KEY = ":snowflake:workerid:lock";private final long expireTTL = 20 * 60 * 1000; // 20分钟过期@PostConstructpublic void init() {this.staticWorkerId = generateDistributedWorkerId();}public int generateDistributedWorkerId() {Integer workerId = null;String appNameMap = appName + WORKER_ID_KEY;String lockKey = appName + WORKER_ID_LOCK_KEY;// 生成唯一的锁标识，防止误删其他线程的锁String lockValue = UUID.randomUUID().toString();try {// 尝试获取分布式锁boolean locked = tryLock(lockKey, lockValue);if (!locked) {// 如果获取锁失败，重试几次for (int i = 0; i < 1000; i++) {Thread.sleep(100); // 等待100ms后重试locked = tryLock(lockKey, lockValue);if (locked) break;}}if (!locked) {throw new RuntimeException("无法获取分布式锁，workerId分配失败");}// 获取锁成功，分配workerIdworkerId = allocateWorkerId(appNameMap);} catch (InterruptedException e) {Thread.currentThread().interrupt();throw new RuntimeException("workerId分配过程被中断", e);} finally {// 释放锁unlock(lockKey, lockValue);}if (workerId == null || workerId > 1023) {throw new RuntimeException("workerId分配失败，没有可用的workerId");}// 启动心跳更新任务startHeartbeatTask(appNameMap, workerId);return workerId;}/*** 尝试获取分布式锁*/private boolean tryLock(String lockKey, String lockValue) {Boolean success = redisTemplate.opsForValue().setIfAbsent(lockKey, lockValue);return Boolean.TRUE.equals(success);}/*** 释放分布式锁*/private void unlock(String lockKey, String lockValue) {try {// 使用Lua脚本保证原子性，只有锁的值匹配时才删除String luaScript ="if redis.call('get', KEYS[1]) == ARGV[1] then " +"    return redis.call('del', KEYS[1]) " +"else " +"    return 0 " +"end";RedisScript script = new DefaultRedisScript<>(luaScript, Long.class);Long result = redisTemplate.execute(script, Collections.singletonList(lockKey), lockValue);if (result == null || result == 0) {log.warn("释放锁失败，锁可能已被其他线程释放或已过期");}} catch (Exception e) {log.error("释放锁时发生异常", e);}}/*** 分配workerId（在锁的保护下执行）*/private Integer allocateWorkerId(String appNameMap) {for (int workerId = 0; workerId <= 1023; workerId++) {if (!redisTemplate.opsForHash().hasKey(appNameMap, String.valueOf(workerId))) {// 找到可用的workerId，立即占用redisTemplate.opsForHash().put(appNameMap, String.valueOf(workerId), System.currentTimeMillis());log.info("成功分配workerId: {} for application: {}", workerId, appName);return workerId;}}return null;}/*** 启动心跳更新任务*/private void startHeartbeatTask(String appNameMap, Integer workerId) {ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();scheduledExecutorService.scheduleAtFixedRate(() -> {try {log.debug("定期更新workerId: {} 的心跳", workerId);// 更新自己的心跳redisTemplate.opsForHash().put(appNameMap, String.valueOf(workerId), System.currentTimeMillis());// 清理过期节点（这里也需要加锁，避免并发清理）cleanupExpiredWorkers(appNameMap);} catch (Exception e) {log.error("心跳更新任务执行异常", e);}}, 2, 10, TimeUnit.MINUTES); // 每10分钟执行一次，比过期时间短}/*** 清理过期的worker节点（需要加锁）*/private void cleanupExpiredWorkers(String appNameMap) {String lockKey = appName + WORKER_ID_LOCK_KEY + ":cleanup";String lockValue = UUID.randomUUID().toString();try {// 尝试获取清理锁，避免多个实例同时清理boolean locked = tryLock(lockKey, lockValue); // 10秒锁超时if (!locked) {return; // 如果没有获取到锁，跳过本次清理}long currentTime = System.currentTimeMillis();Set