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<?php

* This file is part of php-cache organization.

* This source file is subject to the MIT license that is bundled

* with this source code in the file LICENSE.

namespace Cache\Adapter\PHPArray;

use Cache\Adapter\Common\AbstractCachePool;

use Cache\Adapter\Common\PhpCacheItem;

use Cache\Hierarchy\HierarchicalCachePoolTrait;

use Cache\Hierarchy\HierarchicalPoolInterface;

/**

* Array cache pool. You could set a limit of how many items you want to be stored to avoid memory leaks.

* @author Tobias Nyholm <tobias.nyholm@gmail.com>

class ArrayCachePool extends AbstractCachePool implements HierarchicalPoolInterface

{

use HierarchicalCachePoolTrait;

/** @var array<array-key, mixed> */

private array $cache;

/** @var array<int, list<string>> */

private array $keyMap = [];

private ?int $limit;

private int $currentPosition = 0;

/**

* @param array<array-key, mixed> $cache

public function __construct(?int $limit = null, array &$cache = [])

{

$this->cache = &$cache;

$this->limit = $limit;

}

/** @return PhpCacheItem|array{bool, mixed, list<array{0: string, 1: string}>, int|null} */

protected function getItemWithoutGenerateCacheKey(string $key): PhpCacheItem|array

{

if (isset($this->deferred[$key])) {

$item = clone $this->deferred[$key];

$item->moveTagsToPrevious();

return $item;

}

return $this->fetchObjectFromCache($key);

}

/** @return array{bool, mixed, list<array{0: string, 1: string}>, int|null} */

protected function fetchObjectFromCache(string $key): array

{

$keys = $this->getHierarchyKey($key);

if (!$this->cacheIsset($keys)) {

return [false, null, [], null];

}

$element = $this->decodeCacheElement($this->cacheToolkit($keys));

if (null === $element) {

return [false, null, [], null];

}

[$data, $tags, $timestamp] = $element;

if (\is_object($data)) {

$data = clone $data;

}

return [true, $data, $tags, $timestamp];

}

protected function clearAllObjectsFromCache(): bool

{

$this->cache = [];

$this->keyMap = [];

$this->currentPosition = 0;

$this->clearHierarchyKeyCache();

return true;

}

protected function clearOneObjectFromCache(string $key): bool

{

$this->commit();

$keys = $this->getHierarchyKey($key);

$this->clearHierarchyKeyCache();

$this->cacheToolkit($keys, null, true);

foreach ($this->keyMap as $position => $trackedKeys) {

if ($trackedKeys === $keys) {

unset($this->keyMap[$position]);

}

return true;

}

protected function storeItemInCache(PhpCacheItem $item, ?int $ttl): bool

{

$keys = $this->getHierarchyKey($item->getKey());

$value = $item->get();

if (\is_object($value)) {

$value = clone $value;

}

if (null !== $this->limit) {

$tracked = false;

foreach ($this->keyMap as $trackedKeys) {

if ($trackedKeys === $keys) {

$tracked = true;

break;

}

if (!$tracked) {

if (isset($this->keyMap[$this->currentPosition])) {

$this->cacheToolkit($this->keyMap[$this->currentPosition], null, true);

}

$this->keyMap[$this->currentPosition] = $keys;

$this->currentPosition = ($this->currentPosition + 1) % $this->limit;

}

$this->cacheToolkit($keys, [$value, $item->getTagVersions(), $item->getExpirationTimestamp()]);

return true;

}

public function getDirectValue(string $key): mixed

{

return $this->cache[$key] ?? null;

}

/** @return list<string> */

protected function getList(string $name): array

{

$data = $this->cache[$name] ?? [];

if (!\is_array($data)) {

return [];

}

$list = [];

foreach ($data as $value) {

if (!\is_string($value)) {

return [];

}

$list[] = $value;

}

return $list;

}

protected function removeList(string $name): bool

{

unset($this->cache[$name]);

return true;

}

protected function appendListItem(string $name, string $key): bool

{

$list = $this->getList($name);

$list[] = $key;

$this->cache[$name] = $list;

return true;

}

protected function removeListItem(string $name, string $key): bool

{

$list = $this->getList($name);

foreach ($list as $i => $item) {

if ($item === $key) {

unset($list[$i]);

}

$this->cache[$name] = array_values($list);

return true;

}

/**

* Used to manipulate cached data by extracting, inserting or deleting value.

* @param list<string> $keys

private function cacheToolkit(array $keys, mixed $value = null, bool $unset = false): mixed

{

$element = &$this->cache;

while ([] !== $keys) {

$key = array_shift($keys);

if (!\is_array($element)) {

$element = [];

}

if (!$keys && null === $value && $unset) {

unset($element[$key]);

unset($element);

$element = null;

} else {

$element = &$element[$key];

}

if (!$unset && null !== $value) {

$element = $value;

}

return $element;

}

/**

* Checking if given keys exists and is valid.

* @param list<string> $keys

private function cacheIsset(array $keys): bool

{

$data = $this->cache;

foreach ($keys as $key) {

if (!\is_array($data) || !\array_key_exists($key, $data)) {

return false;

}

$data = $data[$key];

}

return \is_array($data) && \array_key_exists(0, $data);

}

/**

* Get a key to use with the hierarchy. If the key does not start with HierarchicalPoolInterface::SEPARATOR

* this will return an unalterered key. This function supports a tagged key. Ie "foo:bar".

* With this overwrite we'll return array as keys.

* @param string $key The original key

* @return list<string>

protected function getHierarchyKey(string $key, ?string &$pathKey = null): array

{

if (!$this->isHierarchyKey($key)) {

return [$key];

}

return $this->explodeKey($key);

}

/** @return array{mixed, list<array{0: string, 1: string}>, int|null}|null */

private function decodeCacheElement(mixed $element): ?array

{

if (!\is_array($element)

|| !\array_key_exists(0, $element)

|| !\array_key_exists(1, $element)

|| !\array_key_exists(2, $element)

|| !\is_array($element[1])

|| (!\is_int($element[2]) && null !== $element[2])

) {

return null;

}

$tags = [];

foreach ($element[1] as $tagVersion) {

if (!\is_array($tagVersion) || !array_is_list($tagVersion) || 2 !== \count($tagVersion)) {

return null;

}

[$tag, $version] = $tagVersion;

if (!\is_string($tag) || !\is_string($version)) {

return null;

}

$tags[] = [$tag, $version];

}

return [$element[0], $tags, $element[2]];

}

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