redis-分布式锁

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * redis 实现分布式锁
 *
 * blog
 * Created with IntelliJ IDEA.
 * User: JiaLi on 2017/9/29 15:05
 */
public class RedisLock {

    private static Logger logger = LoggerFactory.getLogger(RedisLock.class);

    private RedisTemplate redisTemplate;

    private static final int DEFAULT_ACQUIRY_RESOLUTION_MILLIS = 100;

    /**
     * Lock key path.
     */
    private String lockKey;

    /**
     * 锁超时时间，防止线程在入锁以后，无限的执行等待
     */
    private int expireMsecs = 60 * 1000;

    /**
     * 锁等待时间，防止线程饥饿
     */
    private int timeoutMsecs = 10 * 1000;

    private volatile boolean locked = false;

    /**
     * Detailed constructor with default acquire timeout 10000 msecs and lock expiration of 60000
     * msecs.
     *
     * @param lockKey lock key (ex. account:1, ...)
     */
    public RedisLock(RedisTemplate redisTemplate, String lockKey) {
        this.redisTemplate = redisTemplate;
        this.lockKey = lockKey + "_lock";
    }

    /**
     * Detailed constructor with default lock expiration of 60000 msecs.
     */
    public RedisLock(RedisTemplate redisTemplate, String lockKey, int timeoutMsecs) {
        this(redisTemplate, lockKey);
        this.timeoutMsecs = timeoutMsecs;
    }

    /**
     * Detailed constructor.
     */
    public RedisLock(RedisTemplate redisTemplate, String lockKey, int timeoutMsecs,
        int expireMsecs) {
        this(redisTemplate, lockKey, timeoutMsecs);
        this.expireMsecs = expireMsecs;
    }

    /**
     * @return lock key
     */
    public String getLockKey() {
        return lockKey;
    }

    private String get(final String key) {
        Object obj = null;
        try {
            obj = redisTemplate.execute(new RedisCallback