<?php

interface haloadmin_cache_ICache {
    public function exists($key);
    public function get($key);
    public function set($key, $value = null, $expires = null);
    public function delete($key);
}

$cache1 = new haloadmin_cache_SimpleCache();
$cache2 = new haloadmin_cache_RedisCache();

cache_this($cache1, 'hello', 'world');
cache_this($cache2, 'hello', 'world');

function cache_this(haloadmin_cache_ICache $cache, $key, $value = null) {
    $cache->set($key, $value);
}

abstract class haloadmin_cache_AbstractClass implements haloadmin_cache_ICache {
    final public function get($key) { return unserialize($this->getRaw($key)); }
    final public function set($key, $value = null, $expires = null) {
        $this->setRaw($key, serialize($value), $expires);
    }
    abstract public function getRaw($key);
    abstract public function setRaw($key, $value = null, $expires = null);
}

class haloadmin_cache_SimpleCache extends haloadmin_cache_AbstractClass {
    public function exists($key) { return isset($this->map[$key]); }
    public function delete($key) { unset($this->map[$key]; }
    public function getRaw($key) { return $this->map[$key]; }
    public function setRaw($key, $value = null, $expires = null) {
        $this->map[$key] = $value;
    }
}


require_once('haloadmin_cache_AbstractCache.php');
require_once('Predis.php');
require_once('dd_logging_LogFactory.php');
class haloadmin_cache_RedisCache extends haloadmin_cache_AbstractClass {
    /**
     * @var dd_logging_ILogger
     */
    static public $LOGGER;
    public function __construct($url = null, $auth = null) {
        $this->redis = Predis\Client::create($url);
    }
    public function exists($key) { return $this->redis->exists($key); }
    public function delete($key) { $this->redis->delete($key); }
    public function getRaw($key) { return $this->redis->get($key); }
    public function setRaw($key, $value = null, $expires = null) {
        $this->redis->set($key, $value);
        if ( $expires ) {
            if ( self::$LOGGER->isInfoEnabled() ) {
                self::$LOGGER->info('Setting "' . $key . '" to expire in ' . $expires . ' seconds');
            }
            $this->redis->expire($key, $expires);
        }
    }
}
haloadmin_cache_RedisCache::$LOGGER = dd_logging_LogFactory::get('haloadmin_cache_RedisCache');