使用org.redisson.api制作分布式锁

redis可以使用分布式锁的场景，redisson封装了该部分内容，下面看看怎么使用

复制代码

import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

@Component
@Slf4j
public class RedisUtils {

    private static RedissonClient REDISSON_CLIENT;

    public RedisUtils(@Autowired RedissonClient redissonClient) {
        REDISSON_CLIENT = redissonClient;
    }

    /**
     * 尝试获取锁
     *
     * @param key 锁key
     * @param waitTime  最多等待时间，0：表示不等待，只尝试加锁一次
     * @param leaseTime 上锁后自动释放锁时间，-1：表示不自动释放锁
     * @return 获取锁成功返回true 失败返回false
     */
    public static boolean tryLock(String key, long waitTime, long leaseTime) {
        RLock lock = REDISSON_CLIENT.getLock(key);
        try {
            return lock.tryLock(waitTime, leaseTime, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            return false;
        }
    }

    public static void unlock(String key) {
        RLock lock = REDISSON_CLIENT.getLock(key);
        if (lock.isLocked() && lock.isHeldByCurrentThread()) {
            lock.unlock();
        } else {
            log.warn("redis锁已超时释放");
        }
    }

}

java 复制代码

import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

@Component
@Slf4j
public class RedisUtils {

    private static RedissonClient REDISSON_CLIENT;

    public RedisUtils(@Autowired RedissonClient redissonClient) {
        REDISSON_CLIENT = redissonClient;
    }

    /**
     * 尝试获取锁
     *
     * @param key 锁key
     * @param waitTime  最多等待时间，0：表示不等待，只尝试加锁一次
     * @param leaseTime 上锁后自动释放锁时间，-1：表示不自动释放锁
     * @return 获取锁成功返回true 失败返回false
     */
    public static boolean tryLock(String key, long waitTime, long leaseTime) {
        RLock lock = REDISSON_CLIENT.getLock(key);
        try {
            return lock.tryLock(waitTime, leaseTime, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            return false;
        }
    }

    public static void unlock(String key) {
        RLock lock = REDISSON_CLIENT.getLock(key);
        if (lock.isLocked() && lock.isHeldByCurrentThread()) {
            lock.unlock();
        } else {
            log.warn("redis锁已超时释放");
        }
    }

}