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<?php
namespace Illuminate\Cache;
use Illuminate\Contracts\Cache\Lock as LockContract;
use Illuminate\Contracts\Cache\LockTimeoutException;
use Illuminate\Support\InteractsWithTime;
use Illuminate\Support\Str;
abstract class Lock implements LockContract
{
use InteractsWithTime;
/**
* The name of the lock.
*
* @var string
*/
protected $name;
/**
* The number of seconds the lock should be maintained.
*
* @var int
*/
protected $seconds;
/**
* The scope identifier of this lock.
*
* @var string
*/
protected $owner;
/**
* The number of milliseconds to wait before re-attempting to acquire a lock while blocking.
*
* @var int
*/
protected $sleepMilliseconds = 250;
/**
* Create a new lock instance.
*
* @param string $name
* @param int $seconds
* @param string|null $owner
* @return void
*/
public function __construct($name, $seconds, $owner = null)
{
if (is_null($owner)) {
$owner = Str::random();
}
$this->name = $name;
$this->owner = $owner;
$this->seconds = $seconds;
}
/**
* Attempt to acquire the lock.
*
* @return bool
*/
abstract public function acquire();
/**
* Release the lock.
*
* @return bool
*/
abstract public function release();
/**
* Returns the owner value written into the driver for this lock.
*
* @return string
*/
abstract protected function getCurrentOwner();
/**
* Attempt to acquire the lock.
*
* @param callable|null $callback
* @return mixed
*/
public function get($callback = null)
{
$result = $this->acquire();
if ($result && is_callable($callback)) {
try {
return $callback();
} finally {
$this->release();
}
}
return $result;
}
/**
* Attempt to acquire the lock for the given number of seconds.
*
* @param int $seconds
* @param callable|null $callback
* @return mixed
*
* @throws \Illuminate\Contracts\Cache\LockTimeoutException
*/
public function block($seconds, $callback = null)
{
$starting = $this->currentTime();
while (! $this->acquire()) {
usleep($this->sleepMilliseconds * 1000);
if ($this->currentTime() - $seconds >= $starting) {
throw new LockTimeoutException;
}
}
if (is_callable($callback)) {
try {
return $callback();
} finally {
$this->release();
}
}
return true;
}
/**
* Returns the current owner of the lock.
*
* @return string
*/
public function owner()
{
return $this->owner;
}
/**
* Determines whether this lock is allowed to release the lock in the driver.
*
* @return bool
*/
protected function isOwnedByCurrentProcess()
{
return $this->getCurrentOwner() === $this->owner;
}
/**
* Specify the number of milliseconds to sleep in between blocked lock acquisition attempts.
*
* @param int $milliseconds
* @return $this
*/
public function betweenBlockedAttemptsSleepFor($milliseconds)
{
$this->sleepMilliseconds = $milliseconds;
return $this;
}
}
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