Redisson是架设在Redis基础上的一个Java驻内存数据网格(In-Memory Data Grid)。【Redis官方推荐】
适用场景
主要适用于以下几种场景:
分布式应用,缓存,分布式会话,分布式任务/服务/延迟执行服务,Redis客户端
redisson初始化:
@Component
@Slf4j
public class RedissonManager {
private Config config = new Config();
private Redisson redisson = null;
public Redisson getRedisson() {
return redisson;
}
private static String redis1Ip = PropertiesUtil.getProperty("redis1.ip");
private static Integer redis1Port = Integer.parseInt(PropertiesUtil.getProperty("redis1.port"));
private static String redis2Ip = PropertiesUtil.getProperty("redis2.ip");
private static Integer redis2Port = Integer.parseInt(PropertiesUtil.getProperty("redis2.port"));
@PostConstruct
private void init(){
try {
config.useSingleServer().setAddress(new StringBuilder().append(redis1Ip).append(":").append(redis1Port).toString());
redisson = (Redisson) Redisson.create(config);
log.info("初始化Redisson结束");
} catch (Exception e) {
log.error("redisson init error",e);
}
}
}
redisson分布式锁实战
@Scheduled(cron="0 */1 * * * ?")
public void closeOrderTaskV4(){
RLock lock = redissonManager.getRedisson().getLock(Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK);
boolean getLock = false;
try {
if(getLock = lock.tryLock(0,50, TimeUnit.SECONDS)){
log.info("Redisson获取到分布式锁:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
int hour = Integer.parseInt(PropertiesUtil.getProperty("close.order.task.time.hour","2"));
// iOrderService.closeOrder(hour);
}else{
log.info("Redisson没有获取到分布式锁:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
}
} catch (InterruptedException e) {
log.error("Redisson分布式锁获取异常",e);
} finally {
if(!getLock){
return;
}
lock.unlock();
log.info("Redisson分布式锁释放锁");
}
}
这里面wait_time有个小坑,通常lock.tryLock后面的第一个参数我们会设置为 0,(0秒)这样可以避免 集群环境下两个线程同时拿到锁。