Redisson是架設在Redis基礎上的一個Java駐內存數據網格(In-Memory Data Grid)。【Redis官方推薦】
適用場景
主要適用於以下幾種場景:
分佈式應用,緩存,分佈式會話,分佈式任務/服務/延遲執行服務,Redis客戶端
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結束");
} catch (Exception e) {
log.error("redisson init error",e);
}
}
}
redisson分佈式鎖實戰
@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獲取到分佈式鎖:{},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沒有獲取到分佈式鎖:{},ThreadName:{}",Const.REDIS_LOCK.CLOSE_ORDER_TASK_LOCK,Thread.currentThread().getName());
}
} catch (InterruptedException e) {
log.error("Redisson分佈式鎖獲取異常",e);
} finally {
if(!getLock){
return;
}
lock.unlock();
log.info("Redisson分佈式鎖釋放鎖");
}
}
這裏面wait_time有個小坑,通常lock.tryLock後面的第一個參數我們會設置爲 0,(0秒)這樣可以避免 集羣環境下兩個線程同時拿到鎖。