friendica-github/src/Core/Cache/AbstractCacheDriver.php

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<?php
namespace Friendica\Core\Cache;
/**
* Abstract class for common used functions
*
* Class AbstractCacheDriver
*
* @package Friendica\Core\Cache
*/
abstract class AbstractCacheDriver implements ICacheDriver
{
/**
* @var string The hostname
*/
private $hostName;
public function __construct(string $hostName)
{
$this->hostName = $hostName;
}
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/**
* Returns the prefix (to avoid namespace conflicts)
*
* @return string
* @throws \Exception
*/
protected function getPrefix()
{
// We fetch with the hostname as key to avoid problems with other applications
return $this->hostName;
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}
/**
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* @param string $key The original key
* @return string The cache key used for the cache
* @throws \Exception
*/
protected function getCacheKey($key)
{
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return $this->getPrefix() . ":" . $key;
}
/**
* @param array $keys A list of cached keys
* @return array A list of original keys
*/
protected function getOriginalKeys($keys)
{
if (empty($keys)) {
return [];
} else {
// Keys are prefixed with the node hostname, let's remove it
array_walk($keys, function (&$value) {
$value = preg_replace('/^' . $this->hostName . ':/', '', $value);
});
sort($keys);
return $keys;
}
}
/**
* Filters the keys of an array with a given prefix
* Returns the filtered keys as an new array
*
* @param array $array The array, which should get filtered
* @param string|null $prefix The prefix (if null, all keys will get returned)
*
* @return array The filtered array with just the keys
*/
protected function filterArrayKeysByPrefix($array, $prefix = null)
{
if (empty($prefix)) {
return array_keys($array);
} else {
$result = [];
foreach (array_keys($array) as $key) {
if (strpos($key, $prefix) === 0) {
array_push($result, $key);
}
}
return $result;
}
}
}