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<?php
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/*
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 * Copyright 2010 Google Inc.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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if (!class_exists('Google_Client')) {
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  require_once dirname(__FILE__) . '/../autoload.php';
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}
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/**
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 * A persistent storage class based on the APC cache, which is not
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 * really very persistent, as soon as you restart your web server
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 * the storage will be wiped, however for debugging and/or speed
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 * it can be useful, and cache is a lot cheaper then storage.
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 *
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 * @author Chris Chabot <chabotc@google.com>
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 */
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#[AllowDynamicProperties]
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class Google_Cache_Apc extends Google_Cache_Abstract
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{
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  /**
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   * @var Google_Client the current client
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   */
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  private $client;
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  public function __construct(Google_Client $client)
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  {
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    if (! function_exists('apc_add') ) {
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      $error = "Apc functions not available";
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      $client->getLogger()->error($error);
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      throw new Google_Cache_Exception($error);
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    }
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    $this->client = $client;
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  }
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   /**
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   * @inheritDoc
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   */
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  public function get($key, $expiration = false)
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  {
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    $ret = apc_fetch($key);
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    if ($ret === false) {
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      $this->client->getLogger()->debug(
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          'APC cache miss',
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          array('key' => $key)
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      );
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      return false;
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    }
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    if (is_numeric($expiration) && (time() - $ret['time'] > $expiration)) {
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      $this->client->getLogger()->debug(
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          'APC cache miss (expired)',
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          array('key' => $key, 'var' => $ret)
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      );
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      $this->delete($key);
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      return false;
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    }
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    $this->client->getLogger()->debug(
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        'APC cache hit',
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        array('key' => $key, 'var' => $ret)
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    );
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    return $ret['data'];
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  }
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  /**
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   * @inheritDoc
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   */
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  public function set($key, $value)
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  {
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    $var = array('time' => time(), 'data' => $value);
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    $rc = apc_store($key, $var);
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    if ($rc == false) {
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      $this->client->getLogger()->error(
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          'APC cache set failed',
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          array('key' => $key, 'var' => $var)
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      );
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      throw new Google_Cache_Exception("Couldn't store data");
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    }
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    $this->client->getLogger()->debug(
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        'APC cache set',
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        array('key' => $key, 'var' => $var)
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    );
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  }
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  /**
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   * @inheritDoc
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   * @param String $key
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   */
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  public function delete($key)
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  {
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    $this->client->getLogger()->debug(
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        'APC cache delete',
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        array('key' => $key)
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    );
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    apc_delete($key);
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  }
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}