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