/**
* 上锁
*
* @param string $key
* @return boolean
*/
public function acquire($name)
{
$key = $this->getKey($name);
$time = time();
while (time() - $time < $this->max_timeout) {
$lockValue = time() + $this->timeout;
if ($this->redis->set($key, $lockValue, "EX", $this->timeout, "NX")) {
// 加锁成功。
return true;
}
// 未能加锁成功。
// 检查当前锁是否已过期，并重新锁定。
if ($this->redis->get($key) < time() && $this->redis->getset($key, $lockValue) < time()) {
$this->redis->expire($key, $this->timeout);
return true;
}
usleep($this->retry_wait_usec);
}
return false;
}
/**
* @param $key
* @return null|string
*/
protected function getCache($key)
{
$cachedValue = $this->redis->get($key);
return is_null($cachedValue) ? null : unserialize($cachedValue);
}
/**
* Retrieve an item from the cache by key.
*
* @param string $key
* @return mixed
*/
protected function retrieveItem($key)
{
if (!is_null($value = $this->redis->get($this->prefix . $key))) {
return unserialize($value);
}
}
/**
* Retrieve an item from the cache by key.
*
* @param string $key
* @return mixed
*/
public function get($key)
{
if (!is_null($value = $this->redis->get($this->prefix . $key))) {
return is_numeric($value) ? $value : unserialize($value);
}
}
