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