<?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('UDP_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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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(UDP_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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}

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