Adapter.php

<?php
class EventCacheAdapter {
	protected $_config = array(
	);

	protected $_flushSafe = true;

	public function __construct ($options = array()) {
		$this->_config = array_merge($this->_config, $options);
	}
	public function init () {
		return true;
	}
	public function isFlushSafe () {
		return $this->_flushSafe;
	}


	public function get ($key) {
		trigger_error(sprintf('%s::%s needs to be implemented', __CLASS__, __FUNCTION__), E_USER_ERROR);
	}
	public function set ($key, $val, $ttl = 0) {
		trigger_error(sprintf('%s::%s needs to be implemented', __CLASS__, __FUNCTION__), E_USER_ERROR);
	}
	public function delete ($key) {
		trigger_error(sprintf('%s::%s needs to be implemented', __CLASS__, __FUNCTION__), E_USER_ERROR);
	}
	public function flush () {
		trigger_error(sprintf('%s::%s needs to be implemented', __CLASS__, __FUNCTION__), E_USER_ERROR);
	}


	public function increment ($key, $val = 1) {
		if ($this->set($key, ($new = (float)$this->get($key) + $val))) {
			return $new;
		}
		return false;
	}
	public function decrement ($key, $val = 1) {
		if ($this->set($key, ($new = (float)$this->get($key) - $val))) {
			return $new;
		}
		return false;
	}


	/**
	 * Add remove element from an array in cache
	 *
	 * @param <type> $ulistKey
	 * @param <type> $safeKey
	 * @param <type> $ttl
	 *
	 * @return <type>
	 */
	public function ulistDelete ($ulistKey, $safeKey) {
		$ulist = $this->get($ulistKey);
		if (is_array($ulist) && array_key_exists($safeKey, $ulist)) {
			unset($ulist[$safeKey]);
			return $this->set($ulistKey, $ulist);
		}
		// Didn't have to remove non-existing key
		return null;
	}

	/**
	 * Adds item to a unique list (associative array)
	 *
	 * @param <type> $ulistKey
	 * @param <type> $safeKey  leave null to add item at the end of numerically indexed array
	 * @param <type> $val
	 * @param <type> $ttl
	 *
	 * @return mixed boolean or null
	 */
	public function ulistSet ($ulistKey, $safeKey, $val) {
		$ulist = $this->get($ulistKey);
		if (empty($ulist)) {
			$ulist = array();
		}

		$ulist[$safeKey] = $val;

		return $this->set($ulistKey, $ulist);
	}

	public function getUlist ($ulistKey) {
		return $this->get($ulistKey);
	}

	public function listAdd ($listKey, $val = null) {
		$list = $this->get($listKey);
		if (empty($list)) {
			$list = array();
		}
		$list[] = $val;

		return $this->set($listKey, $list);
	}
	public function getList ($listKey) {
		return $this->get($listKey);
	}
}