SimpleCache.php

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<?php
namespace Elgg\Cache;

use Elgg\Config;
use Elgg\Database\Datalist;
use Elgg\ViewsService as Views;


class SimpleCache {

    private $config;

    private $datalist;

    private $views;

    public function __construct(Config $config, Datalist $datalist, Views $views) {
        $this->config = $config;
        $this->datalist = $datalist;
        $this->views = $views;
    }

    function registerView($view_name) {
        $view_name = $this->views->canonicalizeViewName($view_name);
        elgg_register_external_view($view_name, true);
    }

    function getUrl($view, $subview = '') {
        // handle `getUrl('js', 'js/blog/save_draft')`
        if (($view === 'js' || $view === 'css') && 0 === strpos($subview, $view . '/')) {
            $view = $subview;
            $subview = '';
        }

        // handle `getUrl('js', 'blog/save_draft')`
        if (!empty($subview)) {
            $view = "$view/$subview";
        }

        $view = $this->views->canonicalizeViewName($view);

        // should be normalized to canonical form by now: `getUrl('blog/save_draft.js')`
        $this->registerView($view);
        return $this->getRoot() . $view;
    }

    function getRoot() {
        $viewtype = elgg_get_viewtype();
        if ($this->isEnabled()) {
            // stored in datalist as 'simplecache_lastupdate'
            $lastcache = (int)$this->config->get('lastcache');
        } else {
            $lastcache = 0;
        }

        return elgg_normalize_url("/cache/$lastcache/$viewtype/");
    }

    function isEnabled() {
        return (bool) $this->config->get('simplecache_enabled');
    }

    function enable() {
        $this->datalist->set('simplecache_enabled', 1);
        $this->config->set('simplecache_enabled', 1);
        $this->invalidate();
    }

    function disable() {
        if ($this->config->get('simplecache_enabled')) {
            $this->datalist->set('simplecache_enabled', 0);
            $this->config->set('simplecache_enabled', 0);

            $this->invalidate();
        }
    }

    private function getPath() {
        $realpath = realpath($this->config->getCachePath());
        return rtrim($realpath, DIRECTORY_SEPARATOR) . "/views_simplecache";
    }

    function invalidate() {
        _elgg_rmdir($this->getPath(), true);

        $time = time();
        $this->datalist->set("simplecache_lastupdate", $time);
        $this->config->set('lastcache', $time);

        return true;
    }

    function init() {
        $lastcache = $this->config->get('lastcache');
        if (!defined('UPGRADING') && empty($lastcache)) {
            $this->config->set('lastcache', (int)$this->datalist->get('simplecache_lastupdate'));
        }
    }
}