esoTalk APC caching plugin

plugin.php

<?php
/**
 * An APC caching plugin for esoTalk. This does not do much on its own, due to limited esoTalk support for caching.
 *
 * 2014 Tux
 */

if (!defined("IN_ESOTALK")) exit;

ET::$pluginInfo["APCCache"] = array(
    "name" => "APCCache",
    "description" => "Allows the use of APC caching to speed up your forums.",
    "version" => "0.1",
    "author" => "The Chunk",
    "authorEmail" => "support@thechunk.net",
    "authorURL" => "http://thechunk,net",
    "license" => "WTFPL"
);

/**
 * The plugin.
 */
class ETPlugin_APCCache extends ETPlugin {
    public function boot() {
        ETFactory::register('cache', 'ETCache_APC');
    }
}

/**
 * The cache itself proper.
 */
class ETCache_APC {
    function __construct() {
        // Verify we can exist
        if (!function_exists("apc_add")) {
            throw new Exception("You must install APC.");
        }
    }

    public function exists($key)
    {
        return apc_exists(C("esoTalk.cookie.name") . $key);
    }

    public function get($key)
    {
        return apc_fetch(C("esoTalk.cookie.name") . $key);
    }

    public function store($key, $value, $ttl = 0)
    {
        return apc_store(C("esoTalk.cookie.name") . $key, $value, $ttl);
    }

    public function remove($key)
    {
        return apc_delete(C("esoTalk.cookie.name") . $key);
    }
}