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<?php
/*
 * Copyright 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

if (!class_exists('UDP_Google_Client')) {
  require_once dirname(__FILE__) . '/../autoload.php';
}

/**
 * A persistent storage class based on the memcache, which is not
 * really very persistent, as soon as you restart your memcache daemon
 * the storage will be wiped.
 *
 * Will use either the memcache or memcached extensions, preferring
 * memcached.
 *
 * @author Chris Chabot <chabotc@google.com>
 */
class Google_Cache_Memcache extends Google_Cache_Abstract
{
  private $connection = false;
  private $mc = false;
  private $host;
  private $port;

/**
   * @var Google_Client the current client
   */
  private $client;

public function __construct(UDP_Google_Client $client)
  {
    if (!function_exists('memcache_connect') && !class_exists("Memcached")) {
      $error = "Memcache functions not available";

$client->getLogger()->error($error);
      throw new Google_Cache_Exception($error); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
    }

$this->client = $client;

if ($client->isAppEngine()) {
      // No credentials needed for GAE.
      $this->mc = new Memcached();
      $this->connection = true;
    } else {
      $this->host = $client->getClassConfig($this, 'host');
      $this->port = $client->getClassConfig($this, 'port');
      if (empty($this->host) || (empty($this->port) && (string) $this->port != "0")) {
        $error = "You need to supply a valid memcache host and port";

$client->getLogger()->error($error);
        throw new Google_Cache_Exception($error); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
      }
    }
  }

/**
   * @inheritDoc
   */
  public function get($key, $expiration = false)
  {
    $this->connect();
    $ret = false;
    if ($this->mc) {
      $ret = $this->mc->get($key);
    } else {
      $ret = memcache_get($this->connection, $key);
    }
    if ($ret === false) {
      $this->client->getLogger()->debug(
          'Memcache cache miss',
          array('key' => $key)
      );
      return false;
    }
    if (is_numeric($expiration) && (time() - $ret['time'] > $expiration)) {
      $this->client->getLogger()->debug(
          'Memcache cache miss (expired)',
          array('key' => $key, 'var' => $ret)
      );
      $this->delete($key);
      return false;
    }

$this->client->getLogger()->debug(
        'Memcache cache hit',
        array('key' => $key, 'var' => $ret)
    );

return $ret['data'];
  }

/**
   * @inheritDoc
   * @param string $key
   * @param string $value
   * @throws Google_Cache_Exception
   */
  public function set($key, $value)
  {
    $this->connect();
    // we store it with the cache_time default expiration so objects will at
    // least get cleaned eventually.
    $data = array('time' => time(), 'data' => $value);
    $rc = false;
    if ($this->mc) {
      $rc = $this->mc->set($key, $data);
    } else {
      $rc = memcache_set($this->connection, $key, $data, false);
    }
    if ($rc == false) {
      $this->client->getLogger()->error(
          'Memcache cache set failed',
          array('key' => $key, 'var' => $data)
      );

throw new Google_Cache_Exception("Couldn't store data in cache");
    }

$this->client->getLogger()->debug(
        'Memcache cache set',
        array('key' => $key, 'var' => $data)
    );
  }

/**
   * @inheritDoc
   * @param String $key
   */
  public function delete($key)
  {
    $this->connect();
    if ($this->mc) {
      $this->mc->delete($key, 0);
    } else {
      memcache_delete($this->connection, $key, 0);
    }

$this->client->getLogger()->debug(
        'Memcache cache delete',
        array('key' => $key)
    );
  }

/**
   * Lazy initialiser for memcache connection. Uses pconnect for to take
   * advantage of the persistence pool where possible.
   */
  private function connect()
  {
    if ($this->connection) {
      return;
    }

if (class_exists("Memcached")) {
      $this->mc = new Memcached();
      $this->mc->addServer($this->host, $this->port);
       $this->connection = true;
    } else {
      $this->connection = memcache_pconnect($this->host, $this->port);
    }

if (! $this->connection) {
      $error = "Couldn't connect to memcache server";

$this->client->getLogger()->error($error);
      throw new Google_Cache_Exception($error); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Error message to be escaped when caught and printed.
    }
  }
}

Nama File / Folder	Size	Action
Apc.php	2.886KB	Edit File Delete File Rename
File.php	5.716KB	Edit File Delete File Rename
Memcache.php	5.076KB	Edit File Delete File Rename
Null.php	1.173KB	Edit File Delete File Rename