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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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|
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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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/** |
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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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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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|
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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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|
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$client->getLogger()->error($error); |
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throw new Google_Cache_Exception($error); |
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} |
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|
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$this->client = $client; |
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} |
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|
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/** |
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* @inheritDoc |
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*/ |
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public function get($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($key); |
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return false; |
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} |
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|
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$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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|
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return $ret['data']; |
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} |
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|
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/** |
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* @inheritDoc |
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*/ |
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public function set($key, $value) |
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{ |
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$var = array('time' => time(), 'data' => $value); |
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$rc = apc_store($key, $var); |
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|
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if ($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' => $var) |
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); |
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throw new Google_Cache_Exception("Couldn't store data"); |
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} |
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|
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$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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/** |
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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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} |
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|
