package redis.case2;

import org.redisson.api.RLock;
import org.redisson.api.RMap;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
 
@Component
public class RedissonDistributedLocker implements DistributedLocker {
    @Autowired
    private RedissonClient redissonClient;  //RedissonClient已经由配置类生成，这里自动装配即可
 
    //lock(), 拿不到lock就不罢休，不然线程就一直block
    @Override
    public RLock lock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock();
        return lock;
    }
 
    //leaseTime为加锁时间，单位为秒
    @Override
    public RLock lock(String lockKey, long leaseTime) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(leaseTime, TimeUnit.SECONDS);
        return lock;
    }
    
    //timeout为加锁时间，时间单位由unit确定
    @Override
    public RLock lock(String lockKey, TimeUnit unit ,long timeout) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.lock(timeout, unit);
        return lock;
    }
    //tryLock()，马上返回，拿到lock就返回true，不然返回false。
    //带时间限制的tryLock()，拿不到lock，就等一段时间，超时返回false.
    @Override
    public boolean tryLock(String lockKey, TimeUnit unit, long waitTime, long leaseTime) {
        RLock lock = redissonClient.getLock(lockKey);
        try {
            return lock.tryLock(waitTime, leaseTime, unit);
        } catch (InterruptedException e) {
            return false;
        }
    }
    
    @Override
    public void unlock(String lockKey) {
        RLock lock = redissonClient.getLock(lockKey);
        lock.unlock();
    }
    
    @Override
    public void unlock(RLock lock) {
        lock.unlock();
    }

    @Override
    public Future tryLockAsync(String lockKey,long waitTime, long leaseTime){
        RLock lock = redissonClient.getLock(lockKey);
        lock.lockAsync();
        lock.lockAsync(leaseTime, TimeUnit.SECONDS);
        Future<Boolean> future = lock.tryLockAsync(waitTime, leaseTime, TimeUnit.SECONDS);
        return future;
    }
}