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<?php
namespace Alpha\Util\Cache;
use Alpha\Util\Logging\Logger;
use Alpha\Util\Config\ConfigProvider;
use Memcached;
/**
* An implementation of the CacheProviderInterface interface that uses Memcache as the
* target store.
*
* @since 1.1
*
* @author John Collins <dev@alphaframework.org>
* @license http://www.opensource.org/licenses/bsd-license.php The BSD License
* @copyright Copyright (c) 2018, John Collins (founder of Alpha Framework).
* All rights reserved.
*
* <pre>
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
* * Neither the name of the Alpha Framework nor the names
* of its contributors may be used to endorse or promote
* products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* </pre>
*/
class CacheProviderMemcache implements CacheProviderInterface
{
/**
* Trace logger.
*
* @var \Alpha\Util\Logging\Logger
*
* @since 1.1
*/
private static $logger = null;
/**
* Connection to the cache server.
*
* @var Memcache
*
* @since 1.2.4
*/
private $connection;
/**
* Cache key prefix to use, based on the application title, to prevent key clashes between different apps
* using the same cache provider.
*
* @var string
*
* @since 3.0.0
*/
private $appPrefix;
/**
* Constructor.
*
* @since 1.1
*/
public function __construct()
{
self::$logger = new Logger('CacheProviderMemcache');
$config = ConfigProvider::getInstance();
$this->appPrefix = preg_replace("/[^a-zA-Z0-9]+/", "", $config->get('app.title'));
try {
$this->connection = new Memcached();
$this->connection->addServer($config->get('cache.memcached.host'), $config->get('cache.memcached.port'));
$this->connection->setOption(Memcached::OPT_COMPRESSION, true);
} catch (\Exception $e) {
self::$logger->error('Error while attempting to load connect to Memcache cache: ['.$e->getMessage().']');
}
}
/**
* {@inheritdoc}
*/
public function get($key)
{
self::$logger->debug('>>get(key=['.$key.'])');
try {
$value = $this->connection->get($this->appPrefix.'-'.$key);
self::$logger->debug('<<get: ['.print_r($value, true).'])');
return $value;
} catch (\Exception $e) {
self::$logger->error('Error while attempting to load a business object from Memcache instance: ['.$e->getMessage().']');
self::$logger->debug('<<get: [false])');
return false;
}
}
/**
* {@inheritdoc}
*/
public function set($key, $value, $expiry = 0)
{
try {
if ($expiry > 0) {
$this->connection->set($this->appPrefix.'-'.$key, $value, $expiry);
} else {
$this->connection->set($this->appPrefix.'-'.$key, $value);
}
} catch (\Exception $e) {
self::$logger->error('Error while attempting to store a value to Memcached instance: ['.$e->getMessage().']');
}
}
/**
* {@inheritdoc}
*/
public function delete($key)
{
try {
$this->connection->delete($this->appPrefix.'-'.$key);
} catch (\Exception $e) {
self::$logger->error('Error while attempting to remove a value from Memcached instance: ['.$e->getMessage().']');
}
}
}