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<?php
/**
* Generic cache trait for search module
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
*/
trait GlobalSearchCacheTrait
{
protected static $cache = [];
/**
* Convenience method for getting and setting value at once.
* @param string $index Index to look up/set
* @param Closure $generator Generator for the value
* @return mixed value
*/
protected static function fromCache($index, Closure $generator)
{
if (static::hasCachedItem($index)) {
return static::getCachedItem($index);
}
return static::setCachedItem($index, $generator());
}
/**
* Returns whether the cache has the item
* @param string $index Index to look up
* @return boolean
*/
protected static function hasCachedItem($index)
{
return array_key_exists($index, static::$cache);
}
/**
* Returns the cached item
* @param string $index Index to look up
* @return mixed value of item or null if not found
*/
protected static function getCachedItem($index)
{
return static::hasCachedItem($index) ? static::$cache[$index] : null;
}
/**
* Stored an item in cache
* @param string $index Index to store
* @param string $value Value to store
* @return mixed value
*/
protected static function setCachedItem($index, $value)
{
return static::$cache[$index] = $value;
}
/**
* Clears the cache.
*/
public static function clearCache()
{
static::$cache = [];
}
}
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