/*
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* Copyright 1999-2019 Seata.io Group.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.seata.server.storage.redis.lock;
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import io.seata.common.loader.LoadLevel;
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import io.seata.common.loader.Scope;
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import io.seata.core.store.DistributedLockDO;
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import io.seata.core.store.DistributedLocker;
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import io.seata.server.storage.redis.JedisPooledFactory;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import redis.clients.jedis.Jedis;
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import redis.clients.jedis.Transaction;
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import redis.clients.jedis.params.SetParams;
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/**
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* Redis distributed lock
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* @author zhongxiang.wang
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*/
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@LoadLevel(name = "redis", scope = Scope.SINGLETON)
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public class RedisDistributedLocker implements DistributedLocker {
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protected static final Logger LOGGER = LoggerFactory.getLogger(RedisDistributedLocker.class);
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private static final String SUCCESS = "OK";
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/**
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* Acquire the distributed lock
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*
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* @param distributedLockDO the distributed lock info
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* @return the distributed lock info
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*/
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@Override
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public boolean acquireLock(DistributedLockDO distributedLockDO) {
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try (Jedis jedis = JedisPooledFactory.getJedisInstance()) {
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//Don't need retry,if can't acquire the lock,let the other get the lock
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String result = jedis.set(distributedLockDO.getLockKey(), distributedLockDO.getLockValue(), SetParams.setParams().nx().px(distributedLockDO.getExpireTime()));
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return SUCCESS.equalsIgnoreCase(result);
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} catch (Exception ex) {
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LOGGER.error("The {} acquired the {} distributed lock failed.", distributedLockDO.getLockValue(), distributedLockDO.getLockKey(), ex);
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return false;
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}
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}
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/**
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* Release the distributed lock
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*
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* @param distributedLockDO the distributed lock info
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* @return the boolean
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*/
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@Override
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public boolean releaseLock(DistributedLockDO distributedLockDO) {
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String lockKey = distributedLockDO.getLockKey();
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String lockValue = distributedLockDO.getLockValue();
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try (Jedis jedis = JedisPooledFactory.getJedisInstance()) {
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jedis.watch(lockKey);
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//Check the value to prevent release the other's lock
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if (lockValue.equals(jedis.get(lockKey))) {
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Transaction multi = jedis.multi();
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multi.del(lockKey);
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multi.exec();
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return true;
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}
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//The lock hold by others,If other one get the lock,we release lock success too as for current lockKey
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jedis.unwatch();
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return true;
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} catch (Exception ex) {
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LOGGER.error("The {} release the {} distributed lock failed.", lockValue, lockKey, ex);
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return false;
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}
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}
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}
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