comparison core/lib/Drupal/Core/Cache/CacheBackendInterface.php @ 0:4c8ae668cc8c

Initial import (non-working)

+<?php
+
+namespace Drupal\Core\Cache;
+
+/**
+ * Defines an interface for cache implementations.
+ *
+ * All cache implementations have to implement this interface.
+ * Drupal\Core\Cache\DatabaseBackend provides the default implementation, which
+ * can be consulted as an example.
+ *
+ * The cache indentifiers are case sensitive.
+ *
+ * @ingroup cache
+ */
+interface CacheBackendInterface {
+
+  /**
+   * Indicates that the item should never be removed unless explicitly deleted.
+   */
+  const CACHE_PERMANENT = -1;
+
+  /**
+   * Returns data from the persistent cache.
+   *
+   * @param string $cid
+   *   The cache ID of the data to retrieve.
+   * @param bool $allow_invalid
+   *   (optional) If TRUE, a cache item may be returned even if it is expired or
+   *   has been invalidated. Such items may sometimes be preferred, if the
+   *   alternative is recalculating the value stored in the cache, especially
+   *   if another concurrent request is already recalculating the same value.
+   *   The "valid" property of the returned object indicates whether the item is
+   *   valid or not. Defaults to FALSE.
+   *
+   * @return object|false
+   *   The cache item or FALSE on failure.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::getMultiple()
+   */
+  public function get($cid, $allow_invalid = FALSE);
+
+  /**
+   * Returns data from the persistent cache when given an array of cache IDs.
+   *
+   * @param array $cids
+   *   An array of cache IDs for the data to retrieve. This is passed by
+   *   reference, and will have the IDs successfully returned from cache
+   *   removed.
+   * @param bool $allow_invalid
+   *   (optional) If TRUE, cache items may be returned even if they have expired
+   *   or been invalidated. Such items may sometimes be preferred, if the
+   *   alternative is recalculating the value stored in the cache, especially
+   *   if another concurrent thread is already recalculating the same value. The
+   *   "valid" property of the returned objects indicates whether the items are
+   *   valid or not. Defaults to FALSE.
+   *
+   * @return array
+   *   An array of cache item objects indexed by cache ID.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::get()
+   */
+  public function getMultiple(&$cids, $allow_invalid = FALSE);
+
+  /**
+   * Stores data in the persistent cache.
+   *
+   * Core cache implementations set the created time on cache item with
+   * microtime(TRUE) rather than REQUEST_TIME_FLOAT, because the created time
+   * of cache items should match when they are created, not when the request
+   * started. Apart from being more accurate, this increases the chance an
+   * item will legitimately be considered valid.
+   *
+   * @param string $cid
+   *   The cache ID of the data to store.
+   * @param mixed $data
+   *   The data to store in the cache.
+   *   Some storage engines only allow objects up to a maximum of 1MB in size to
+   *   be stored by default. When caching large arrays or similar, take care to
+   *   ensure $data does not exceed this size.
+   * @param int $expire
+   *   One of the following values:
+   *   - CacheBackendInterface::CACHE_PERMANENT: Indicates that the item should
+   *     not be removed unless it is deleted explicitly.
+   *   - A Unix timestamp: Indicates that the item will be considered invalid
+   *     after this time, i.e. it will not be returned by get() unless
+   *     $allow_invalid has been set to TRUE. When the item has expired, it may
+   *     be permanently deleted by the garbage collector at any time.
+   * @param array $tags
+   *   An array of tags to be stored with the cache item. These should normally
+   *   identify objects used to build the cache item, which should trigger
+   *   cache invalidation when updated. For example if a cached item represents
+   *   a node, both the node ID and the author's user ID might be passed in as
+   *   tags. For example ['node:123', 'node:456', 'user:789'].
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::get()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::getMultiple()
+   */
+  public function set($cid, $data, $expire = Cache::PERMANENT, array $tags = []);
+
+  /**
+   * Store multiple items in the persistent cache.
+   *
+   * @param array $items
+   *   An array of cache items, keyed by cid. In the form:
+   *   @code
+   *   $items = array(
+   *     $cid => array(
+   *       // Required, will be automatically serialized if not a string.
+   *       'data' => $data,
+   *       // Optional, defaults to CacheBackendInterface::CACHE_PERMANENT.
+   *       'expire' => CacheBackendInterface::CACHE_PERMANENT,
+   *       // (optional) The cache tags for this item, see CacheBackendInterface::set().
+   *       'tags' => array(),
+   *     ),
+   *   );
+   *   @endcode
+   */
+  public function setMultiple(array $items);
+
+  /**
+   * Deletes an item from the cache.
+   *
+   * If the cache item is being deleted because it is no longer "fresh", you may
+   * consider using invalidate() instead. This allows callers to retrieve the
+   * invalid item by calling get() with $allow_invalid set to TRUE. In some cases
+   * an invalid item may be acceptable rather than having to rebuild the cache.
+   *
+   * @param string $cid
+   *   The cache ID to delete.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidate()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::deleteMultiple()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::deleteAll()
+   */
+  public function delete($cid);
+
+  /**
+   * Deletes multiple items from the cache.
+   *
+   * If the cache items are being deleted because they are no longer "fresh",
+   * you may consider using invalidateMultiple() instead. This allows callers to
+   * retrieve the invalid items by calling get() with $allow_invalid set to TRUE.
+   * In some cases an invalid item may be acceptable rather than having to
+   * rebuild the cache.
+   *
+   * @param array $cids
+   *   An array of cache IDs to delete.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidateMultiple()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::delete()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::deleteAll()
+   */
+  public function deleteMultiple(array $cids);
+
+  /**
+   * Deletes all cache items in a bin.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidateAll()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::delete()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::deleteMultiple()
+   */
+  public function deleteAll();
+
+  /**
+   * Marks a cache item as invalid.
+   *
+   * Invalid items may be returned in later calls to get(), if the $allow_invalid
+   * argument is TRUE.
+   *
+   * @param string $cid
+   *   The cache ID to invalidate.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::delete()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidateMultiple()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidateAll()
+   */
+  public function invalidate($cid);
+
+  /**
+   * Marks cache items as invalid.
+   *
+   * Invalid items may be returned in later calls to get(), if the $allow_invalid
+   * argument is TRUE.
+   *
+   * @param string[] $cids
+   *   An array of cache IDs to invalidate.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::deleteMultiple()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidate()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidateAll()
+   */
+  public function invalidateMultiple(array $cids);
+
+  /**
+   * Marks all cache items as invalid.
+   *
+   * Invalid items may be returned in later calls to get(), if the $allow_invalid
+   * argument is TRUE.
+   *
+   * @see \Drupal\Core\Cache\CacheBackendInterface::deleteAll()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidate()
+   * @see \Drupal\Core\Cache\CacheBackendInterface::invalidateMultiple()
+   */
+  public function invalidateAll();
+
+  /**
+   * Performs garbage collection on a cache bin.
+   *
+   * The backend may choose to delete expired or invalidated items.
+   */
+  public function garbageCollection();
+
+  /**
+   * Remove a cache bin.
+   */
+  public function removeBin();
+
+}