friendica-github/src/Factory/LockDriverFactory.php

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<?php
namespace Friendica\Factory;
use Friendica\Core\Cache\ICacheDriver;
use Friendica\Core\Cache\IMemoryCacheDriver;
use Friendica\Core\Config\Configuration;
use Friendica\Core\Lock;
use Friendica\Database\Database;
use Friendica\Util\Profiler;
use Psr\Log\LoggerInterface;
/**
* Class LockDriverFactory
*
* @package Friendica\Core\Cache
*
* A basic class to generate a LockDriver
*/
class LockDriverFactory
{
/**
* @var string The default driver for caching
*/
const DEFAULT_DRIVER = 'default';
/**
* @var Configuration The configuration to read parameters out of the config
*/
private $config;
/**
* @var Database The database connection in case that the cache is used the dba connection
*/
private $dba;
/**
* @var ICacheDriver The memory cache driver in case we use it
*/
private $cacheDriver;
/**
* @var Profiler The optional profiler if the cached should be profiled
*/
private $profiler;
/**
* @var LoggerInterface The Friendica Logger
*/
private $logger;
public function __construct(ICacheDriver $cacheDriver, Configuration $config, Database $dba, Profiler $profiler, LoggerInterface $logger)
{
$this->cacheDriver = $cacheDriver;
$this->config = $config;
$this->dba = $dba;
$this->logger = $logger;
}
public function create()
{
$lock_driver = $this->config->get('system', 'lock_driver', self::DEFAULT_DRIVER);
try {
switch ($lock_driver) {
case 'memcache':
case 'memcached':
case 'redis':
if ($this->cacheDriver instanceof IMemoryCacheDriver) {
return new Lock\CacheLockDriver($this->cacheDriver);
}
break;
case 'database':
return new Lock\DatabaseLockDriver($this->dba);
break;
case 'semaphore':
return new Lock\SemaphoreLockDriver();
break;
default:
return self::useAutoDriver();
}
} catch (\Exception $exception) {
$this->logger->alert('Driver \'' . $lock_driver . '\' failed - Fallback to \'useAutoDriver()\'', ['exception' => $exception]);
return self::useAutoDriver();
}
}
/**
* @brief This method tries to find the best - local - locking method for Friendica
*
* The following sequence will be tried:
* 1. Semaphore Locking
* 2. Cache Locking
* 3. Database Locking
*
* @return Lock\ILockDriver
*/
private function useAutoDriver()
{
// 1. Try to use Semaphores for - local - locking
if (function_exists('sem_get')) {
try {
return new Lock\SemaphoreLockDriver();
} catch (\Exception $exception) {
$this->logger->debug('Using Semaphore driver for locking failed.', ['exception' => $exception]);
}
}
// 2. Try to use Cache Locking (don't use the DB-Cache Locking because it works different!)
$cache_driver = $this->config->get('system', 'cache_driver', 'database');
if ($cache_driver != 'database') {
try {
if ($this->cacheDriver instanceof IMemoryCacheDriver) {
return new Lock\CacheLockDriver($this->cacheDriver);
}
} catch (\Exception $exception) {
$this->logger->debug('Using Cache driver for locking failed.', ['exception' => $exception]);
}
}
// 3. Use Database Locking as a Fallback
return new Lock\DatabaseLockDriver($this->dba);
}
}