1: <?php
  2: 
  3: namespace Alpha\Util\Cache;
  4: 
  5: use Alpha\Util\Logging\Logger;
  6: use Alpha\Util\Config\ConfigProvider;
  7: use Memcache;
  8: 
  9: /**
 10:  * An implementation of the CacheProviderInterface interface that uses Memcache as the
 11:  * target store.
 12:  *
 13:  * @since 1.1
 14:  *
 15:  * @author John Collins <dev@alphaframework.org>
 16:  * @license http://www.opensource.org/licenses/bsd-license.php The BSD License
 17:  * @copyright Copyright (c) 2015, John Collins (founder of Alpha Framework).
 18:  * All rights reserved.
 19:  *
 20:  * <pre>
 21:  * Redistribution and use in source and binary forms, with or
 22:  * without modification, are permitted provided that the
 23:  * following conditions are met:
 24:  *
 25:  * * Redistributions of source code must retain the above
 26:  *   copyright notice, this list of conditions and the
 27:  *   following disclaimer.
 28:  * * Redistributions in binary form must reproduce the above
 29:  *   copyright notice, this list of conditions and the
 30:  *   following disclaimer in the documentation and/or other
 31:  *   materials provided with the distribution.
 32:  * * Neither the name of the Alpha Framework nor the names
 33:  *   of its contributors may be used to endorse or promote
 34:  *   products derived from this software without specific
 35:  *   prior written permission.
 36:  *
 37:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 38:  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 39:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 40:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 41:  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 42:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 43:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 44:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 45:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 46:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 47:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 48:  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 49:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 50:  * </pre>
 51:  */
 52: class CacheProviderMemcache implements CacheProviderInterface
 53: {
 54:     /**
 55:      * Trace logger.
 56:      *
 57:      * @var Alpha\Util\Logging\Logger
 58:      *
 59:      * @since 1.1
 60:      */
 61:     private static $logger = null;
 62: 
 63:     /**
 64:      * Connection to the cache server.
 65:      *
 66:      * @var Memcache
 67:      *
 68:      * @since 1.2.4
 69:      */
 70:     private $connection;
 71: 
 72:     /**
 73:      * Constructor.
 74:      *
 75:      * @since 1.1
 76:      */
 77:     public function __construct()
 78:     {
 79:         self::$logger = new Logger('CacheProviderMemcache');
 80: 
 81:         $config = ConfigProvider::getInstance();
 82: 
 83:         try {
 84:             $this->connection = new Memcache();
 85:             $this->connection->connect($config->get('cache.memcached.host'), $config->get('cache.memcached.port'));
 86:         } catch (\Exception $e) {
 87:             self::$logger->error('Error while attempting to load connect to Memcache cache: ['.$e->getMessage().']');
 88:         }
 89:     }
 90: 
 91:     /**
 92:      * {@inheritdoc}
 93:      */
 94:     public function get($key)
 95:     {
 96:         self::$logger->debug('>>get(key=['.$key.'])');
 97: 
 98:         try {
 99:             $value = $this->connection->get($key);
100: 
101:             self::$logger->debug('<<get: ['.print_r($value, true).'])');
102: 
103:             return $value;
104:         } catch (\Exception $e) {
105:             self::$logger->error('Error while attempting to load a business object from Memcache instance: ['.$e->getMessage().']');
106:             self::$logger->debug('<<get: [false])');
107: 
108:             return false;
109:         }
110:     }
111: 
112:     /**
113:      * {@inheritdoc}
114:      */
115:     public function set($key, $value, $expiry = 0)
116:     {
117:         try {
118:             if ($expiry > 0) {
119:                 $this->connection->set($key, $value, MEMCACHE_COMPRESSED, $expiry);
120:             } else {
121:                 $this->connection->set($key, $value, MEMCACHE_COMPRESSED);
122:             }
123:         } catch (\Exception $e) {
124:             self::$logger->error('Error while attempting to store a value to Memcached instance: ['.$e->getMessage().']');
125:         }
126:     }
127: 
128:     /**
129:      * {@inheritdoc}
130:      */
131:     public function delete($key)
132:     {
133:         try {
134:             $this->connection->delete($key);
135:         } catch (\Exception $e) {
136:             self::$logger->error('Error while attempting to remove a value from Memcached instance: ['.$e->getMessage().']');
137:         }
138:     }
139: }
140: