326 lines
8.3 KiB
PHP
326 lines
8.3 KiB
PHP
<?php
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namespace Doctrine\Common\Cache;
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use function array_combine;
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use function array_key_exists;
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use function array_map;
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use function sprintf;
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/**
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* Base class for cache provider implementations.
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*/
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abstract class CacheProvider implements Cache, FlushableCache, ClearableCache, MultiOperationCache
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{
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public const DOCTRINE_NAMESPACE_CACHEKEY = 'DoctrineNamespaceCacheKey[%s]';
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/**
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* The namespace to prefix all cache ids with.
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*
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* @var string
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*/
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private $namespace = '';
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/**
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* The namespace version.
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*
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* @var int|null
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*/
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private $namespaceVersion;
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/**
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* Sets the namespace to prefix all cache ids with.
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*
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* @param string $namespace
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*
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* @return void
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*/
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public function setNamespace($namespace)
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{
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$this->namespace = (string) $namespace;
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$this->namespaceVersion = null;
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}
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/**
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* Retrieves the namespace that prefixes all cache ids.
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*
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* @return string
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*/
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public function getNamespace()
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{
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return $this->namespace;
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}
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/**
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* {@inheritdoc}
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*/
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public function fetch($id)
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{
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return $this->doFetch($this->getNamespacedId($id));
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}
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/**
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* {@inheritdoc}
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*/
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public function fetchMultiple(array $keys)
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{
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if (empty($keys)) {
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return [];
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}
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// note: the array_combine() is in place to keep an association between our $keys and the $namespacedKeys
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$namespacedKeys = array_combine($keys, array_map([$this, 'getNamespacedId'], $keys));
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$items = $this->doFetchMultiple($namespacedKeys);
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$foundItems = [];
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// no internal array function supports this sort of mapping: needs to be iterative
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// this filters and combines keys in one pass
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foreach ($namespacedKeys as $requestedKey => $namespacedKey) {
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if (! isset($items[$namespacedKey]) && ! array_key_exists($namespacedKey, $items)) {
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continue;
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}
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$foundItems[$requestedKey] = $items[$namespacedKey];
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}
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return $foundItems;
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}
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/**
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* {@inheritdoc}
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*/
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public function saveMultiple(array $keysAndValues, $lifetime = 0)
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{
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$namespacedKeysAndValues = [];
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foreach ($keysAndValues as $key => $value) {
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$namespacedKeysAndValues[$this->getNamespacedId($key)] = $value;
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}
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return $this->doSaveMultiple($namespacedKeysAndValues, $lifetime);
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}
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/**
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* {@inheritdoc}
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*/
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public function contains($id)
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{
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return $this->doContains($this->getNamespacedId($id));
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}
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/**
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* {@inheritdoc}
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*/
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public function save($id, $data, $lifeTime = 0)
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{
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return $this->doSave($this->getNamespacedId($id), $data, $lifeTime);
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteMultiple(array $keys)
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{
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return $this->doDeleteMultiple(array_map([$this, 'getNamespacedId'], $keys));
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}
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/**
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* {@inheritdoc}
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*/
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public function delete($id)
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{
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return $this->doDelete($this->getNamespacedId($id));
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}
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/**
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* {@inheritdoc}
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*/
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public function getStats()
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{
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return $this->doGetStats();
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}
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/**
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* {@inheritDoc}
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*/
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public function flushAll()
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{
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return $this->doFlush();
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}
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/**
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* {@inheritDoc}
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*/
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public function deleteAll()
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{
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$namespaceCacheKey = $this->getNamespaceCacheKey();
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$namespaceVersion = $this->getNamespaceVersion() + 1;
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if ($this->doSave($namespaceCacheKey, $namespaceVersion)) {
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$this->namespaceVersion = $namespaceVersion;
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return true;
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}
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return false;
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}
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/**
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* Prefixes the passed id with the configured namespace value.
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*
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* @param string $id The id to namespace.
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*
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* @return string The namespaced id.
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*/
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private function getNamespacedId(string $id) : string
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{
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$namespaceVersion = $this->getNamespaceVersion();
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return sprintf('%s[%s][%s]', $this->namespace, $id, $namespaceVersion);
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}
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/**
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* Returns the namespace cache key.
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*/
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private function getNamespaceCacheKey() : string
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{
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return sprintf(self::DOCTRINE_NAMESPACE_CACHEKEY, $this->namespace);
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}
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/**
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* Returns the namespace version.
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*/
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private function getNamespaceVersion() : int
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{
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if ($this->namespaceVersion !== null) {
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return $this->namespaceVersion;
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}
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$namespaceCacheKey = $this->getNamespaceCacheKey();
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$this->namespaceVersion = (int) $this->doFetch($namespaceCacheKey) ?: 1;
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return $this->namespaceVersion;
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}
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/**
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* Default implementation of doFetchMultiple. Each driver that supports multi-get should owerwrite it.
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*
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* @param array $keys Array of keys to retrieve from cache
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*
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* @return array Array of values retrieved for the given keys.
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*/
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protected function doFetchMultiple(array $keys)
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{
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$returnValues = [];
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foreach ($keys as $key) {
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$item = $this->doFetch($key);
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if ($item === false && ! $this->doContains($key)) {
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continue;
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}
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$returnValues[$key] = $item;
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}
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return $returnValues;
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}
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/**
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* Fetches an entry from the cache.
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*
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* @param string $id The id of the cache entry to fetch.
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*
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* @return mixed|false The cached data or FALSE, if no cache entry exists for the given id.
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*/
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abstract protected function doFetch($id);
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/**
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* Tests if an entry exists in the cache.
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*
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* @param string $id The cache id of the entry to check for.
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*
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* @return bool TRUE if a cache entry exists for the given cache id, FALSE otherwise.
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*/
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abstract protected function doContains($id);
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/**
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* Default implementation of doSaveMultiple. Each driver that supports multi-put should override it.
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*
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* @param array $keysAndValues Array of keys and values to save in cache
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* @param int $lifetime The lifetime. If != 0, sets a specific lifetime for these
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* cache entries (0 => infinite lifeTime).
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*
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* @return bool TRUE if the operation was successful, FALSE if it wasn't.
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*/
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protected function doSaveMultiple(array $keysAndValues, $lifetime = 0)
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{
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$success = true;
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foreach ($keysAndValues as $key => $value) {
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if ($this->doSave($key, $value, $lifetime)) {
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continue;
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}
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$success = false;
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}
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return $success;
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}
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/**
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* Puts data into the cache.
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*
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* @param string $id The cache id.
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* @param string $data The cache entry/data.
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* @param int $lifeTime The lifetime. If != 0, sets a specific lifetime for this
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* cache entry (0 => infinite lifeTime).
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*
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* @return bool TRUE if the entry was successfully stored in the cache, FALSE otherwise.
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*/
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abstract protected function doSave($id, $data, $lifeTime = 0);
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/**
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* Default implementation of doDeleteMultiple. Each driver that supports multi-delete should override it.
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*
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* @param array $keys Array of keys to delete from cache
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*
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* @return bool TRUE if the operation was successful, FALSE if it wasn't
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*/
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protected function doDeleteMultiple(array $keys)
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{
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$success = true;
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foreach ($keys as $key) {
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if ($this->doDelete($key)) {
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continue;
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}
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$success = false;
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}
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return $success;
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}
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/**
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* Deletes a cache entry.
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*
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* @param string $id The cache id.
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*
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* @return bool TRUE if the cache entry was successfully deleted, FALSE otherwise.
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*/
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abstract protected function doDelete($id);
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/**
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* Flushes all cache entries.
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*
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* @return bool TRUE if the cache entries were successfully flushed, FALSE otherwise.
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*/
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abstract protected function doFlush();
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/**
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* Retrieves cached information from the data store.
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*
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* @return array|null An associative array with server's statistics if available, NULL otherwise.
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*/
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abstract protected function doGetStats();
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}
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