/**
* Tries to acquire a key lock, otherwise waits until it's released and repeats.
*
* @param string $key
* @throws LockException
* @return bool
*/
public function acquireLock($key)
{
if (isset($this->keys[$key])) {
return $this->increaseLockTimeout($key);
}
$start = microtime(TRUE);
$lockKey = $this->formatLock($key);
$maxAttempts = 10;
do {
$sleepTime = 5000;
do {
if ($this->client->setNX($lockKey, $timeout = $this->calculateTimeout())) {
$this->keys[$key] = $timeout;
return TRUE;
}
if ($this->acquireTimeout !== FALSE && microtime(TRUE) - $start >= $this->acquireTimeout) {
throw LockException::acquireTimeout();
}
$lockExpiration = $this->client->get($lockKey);
$sleepTime += 2500;
} while (empty($lockExpiration) || $lockExpiration >= time() && !usleep($sleepTime));
$oldExpiration = $this->client->getSet($lockKey, $timeout = $this->calculateTimeout());
if ($oldExpiration === $lockExpiration) {
$this->keys[$key] = $timeout;
return TRUE;
}
} while (--$maxAttempts > 0);
throw LockException::highConcurrency();
}
/**
* Tries to acquire a key lock, otherwise waits until it's released and repeats.
*
* @param string $key
* @throws LockException
* @return bool
*/
public function acquireLock($key)
{
if (isset($this->keys[$key])) {
return $this->increaseLockTimeout($key);
}
$lockKey = $this->formatLock($key);
$maxAttempts = 10;
do {
do {
if ($this->client->setNX($lockKey, $timeout = $this->calculateTimeout())) {
$this->keys[$key] = $timeout;
return TRUE;
}
$lockExpiration = $this->client->get($lockKey);
} while (empty($lockExpiration) || $lockExpiration >= time() && !usleep(10000));
$oldExpiration = $this->client->getSet($lockKey, $timeout = $this->calculateTimeout());
if ($oldExpiration === $lockExpiration) {
$this->keys[$key] = $timeout;
return TRUE;
}
} while (--$maxAttempts > 0);
throw new LockException("Lock couldn't be acquired. Concurrency is too high.");
}