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<?php
/**
* SuperCache.php
*
* @copyright MIT
* @author Shabeer Ali M https://github.com/shabeer-ali-m
* @since 0.0.1
*
*/
namespace SuperCache;
/**
* SuperCache Class
*/
class SuperCache
{
/**
* @var string
*/
const EXT = '.tmp';
/**
* @var string
*/
const OPTIONS = '.attr';
/**
* @var SuperCache
*/
private static $instance;
/**
* @var SuperCache
*/
private $attr_instance;
/**
* @var string
*/
static $static_path = DIR_CACHE;
/**
* @var string
*/
private $path;
/**
* @var Cache Key
*/
private $key;
/**
* @var array
*/
private $options;
/**
* __construct
* @param [string] $key cache key
*/
private function __construct($key, $is_super = true)
{
if (defined('SuperCache_PATH')) {
self::$static_path = SuperCache_PATH;
}
$this->path = self::$static_path;
$this->key = $key;
$this->options = [
'expiry' => -1,
'lock' => false,
];
if ($is_super) {
$this->attr_instance = new self($this->key . SuperCache::OPTIONS, false);
if ($this->attr_instance->isExists()) {
$this->options = $this->attr_instance->get();
}
}
}
/**
* attrSave Save Atributes
*/
private function attrSave()
{
$this->attr_instance->set($this->options);
}
/**
* cache
* @param [sting] $key cache key
* @return SuperCache
*/
public static function cache($key)
{
if (!isset(self::$instance[$key])) {
self::$instance[$key] = new self($key);
}
return self::$instance[$key];
}
/**
* Saving cache
* @param [mixed] $val Cache Value
* @return SuperCache
*/
public function set($val)
{
$key = $this->key;
if ($this->options['lock']) {
return $this;
}
$val = var_export($val, true);
// HHVM fails at __set_state, so just use object cast for now
$val = str_replace('stdClass::__set_state', '(object)', $val);
// Write to temp file first to ensure atomicity
$tmp = $this->path . "$key." . uniqid('', true) . SuperCache::EXT;
file_put_contents($tmp, '<?php $val = ' . $val . ';', LOCK_EX);
@rename($tmp, $this->path . $key);
return $this;
}
/**
* Retrieving cache value
* @return [mixed]
*/
public function get()
{
if (!$this->isValid()) {
return;
}
@include $this->path . "$this->key";
return isset($val) ? $val : false;
}
/**
* getOptions Get Super Cache Options
* @return array
*/
public function getOptions()
{
return $this->options;
}
/**
* isExists
* @return boolean
*/
private function isExists()
{
if (file_exists($this->path . "$this->key")) {
return true;
} else {
return false;
}
}
/**
* isValid To check for valid key
* @return boolean
*/
public function isValid()
{
if ($this->options['expiry'] != -1 && $this->options['expiry'] < time()) {
return false;
}
if (!$this->isExists()) {
return false;
}
return true;
}
/**
* clearAll Removing all cache keys and values
*/
public static function clearAll()
{
$files = glob(self::$static_path . 'journal3.*');
if ($files) {
foreach ($files as $file) {
if (is_file($file)) {
@unlink($file);
}
}
}
}
/**
* lock specific cache
* @return SuperCache
*/
public function lock()
{
$this->options['lock'] = true;
$this->attrSave();
return $this;
}
/**
* unlock specific cache
* @return SuperCache
*/
public function unlock()
{
$this->options['lock'] = false;
$this->attrSave();
return $this;
}
/**
* options
* @param array $options
* @return SuperCache
*/
public function options($options)
{
$this->options = array_merge($this->options, $options);
$this->attrSave();
return $this;
}
/**
* destroy Destory a specific key
*/
public function destroy()
{
@unlink($this->path . "$this->key");
@unlink($this->path . "$this->key" . SuperCache::OPTIONS);
}
}