File "CacheInterface.php"
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<?php
namespace React\Cache;
use React\Promise\PromiseInterface;
interface CacheInterface
{
/**
* Retrieves an item from the cache.
*
* This method will resolve with the cached value on success or with the
* given `$default` value when no item can be found or when an error occurs.
* Similarly, an expired cache item (once the time-to-live is expired) is
* considered a cache miss.
*
* ```php
* $cache
* ->get('foo')
* ->then('var_dump');
* ```
*
* This example fetches the value of the key `foo` and passes it to the
* `var_dump` function. You can use any of the composition provided by
* [promises](https://github.com/reactphp/promise).
*
* @param string $key
* @param mixed $default Default value to return for cache miss or null if not given.
* @return PromiseInterface<mixed>
*/
public function get($key, $default = null);
/**
* Stores an item in the cache.
*
* This method will resolve with `true` on success or `false` when an error
* occurs. If the cache implementation has to go over the network to store
* it, it may take a while.
*
* The optional `$ttl` parameter sets the maximum time-to-live in seconds
* for this cache item. If this parameter is omitted (or `null`), the item
* will stay in the cache for as long as the underlying implementation
* supports. Trying to access an expired cache item results in a cache miss,
* see also [`get()`](#get).
*
* ```php
* $cache->set('foo', 'bar', 60);
* ```
*
* This example eventually sets the value of the key `foo` to `bar`. If it
* already exists, it is overridden.
*
* This interface does not enforce any particular TTL resolution, so special
* care may have to be taken if you rely on very high precision with
* millisecond accuracy or below. Cache implementations SHOULD work on a
* best effort basis and SHOULD provide at least second accuracy unless
* otherwise noted. Many existing cache implementations are known to provide
* microsecond or millisecond accuracy, but it's generally not recommended
* to rely on this high precision.
*
* This interface suggests that cache implementations SHOULD use a monotonic
* time source if available. Given that a monotonic time source is only
* available as of PHP 7.3 by default, cache implementations MAY fall back
* to using wall-clock time.
* While this does not affect many common use cases, this is an important
* distinction for programs that rely on a high time precision or on systems
* that are subject to discontinuous time adjustments (time jumps).
* This means that if you store a cache item with a TTL of 30s and then
* adjust your system time forward by 20s, the cache item SHOULD still
* expire in 30s.
*
* @param string $key
* @param mixed $value
* @param ?float $ttl
* @return PromiseInterface<bool> Returns a promise which resolves to `true` on success or `false` on error
*/
public function set($key, $value, $ttl = null);
/**
* Deletes an item from the cache.
*
* This method will resolve with `true` on success or `false` when an error
* occurs. When no item for `$key` is found in the cache, it also resolves
* to `true`. If the cache implementation has to go over the network to
* delete it, it may take a while.
*
* ```php
* $cache->delete('foo');
* ```
*
* This example eventually deletes the key `foo` from the cache. As with
* `set()`, this may not happen instantly and a promise is returned to
* provide guarantees whether or not the item has been removed from cache.
*
* @param string $key
* @return PromiseInterface<bool> Returns a promise which resolves to `true` on success or `false` on error
*/
public function delete($key);
/**
* Retrieves multiple cache items by their unique keys.
*
* This method will resolve with an array of cached values on success or with the
* given `$default` value when an item can not be found or when an error occurs.
* Similarly, an expired cache item (once the time-to-live is expired) is
* considered a cache miss.
*
* ```php
* $cache->getMultiple(array('name', 'age'))->then(function (array $values) {
* $name = $values['name'] ?? 'User';
* $age = $values['age'] ?? 'n/a';
*
* echo $name . ' is ' . $age . PHP_EOL;
* });
* ```
*
* This example fetches the cache items for the `name` and `age` keys and
* prints some example output. You can use any of the composition provided
* by [promises](https://github.com/reactphp/promise).
*
* @param string[] $keys A list of keys that can obtained in a single operation.
* @param mixed $default Default value to return for keys that do not exist.
* @return PromiseInterface<array> Returns a promise which resolves to an `array` of cached values
*/
public function getMultiple(array $keys, $default = null);
/**
* Persists a set of key => value pairs in the cache, with an optional TTL.
*
* This method will resolve with `true` on success or `false` when an error
* occurs. If the cache implementation has to go over the network to store
* it, it may take a while.
*
* The optional `$ttl` parameter sets the maximum time-to-live in seconds
* for these cache items. If this parameter is omitted (or `null`), these items
* will stay in the cache for as long as the underlying implementation
* supports. Trying to access an expired cache items results in a cache miss,
* see also [`get()`](#get).
*
* ```php
* $cache->setMultiple(array('foo' => 1, 'bar' => 2), 60);
* ```
*
* This example eventually sets the list of values - the key `foo` to 1 value
* and the key `bar` to 2. If some of the keys already exist, they are overridden.
*
* @param array $values A list of key => value pairs for a multiple-set operation.
* @param ?float $ttl Optional. The TTL value of this item.
* @return PromiseInterface<bool> Returns a promise which resolves to `true` on success or `false` on error
*/
public function setMultiple(array $values, $ttl = null);
/**
* Deletes multiple cache items in a single operation.
*
* @param string[] $keys A list of string-based keys to be deleted.
* @return PromiseInterface<bool> Returns a promise which resolves to `true` on success or `false` on error
*/
public function deleteMultiple(array $keys);
/**
* Wipes clean the entire cache.
*
* @return PromiseInterface<bool> Returns a promise which resolves to `true` on success or `false` on error
*/
public function clear();
/**
* Determines whether an item is present in the cache.
*
* This method will resolve with `true` on success or `false` when no item can be found
* or when an error occurs. Similarly, an expired cache item (once the time-to-live
* is expired) is considered a cache miss.
*
* ```php
* $cache
* ->has('foo')
* ->then('var_dump');
* ```
*
* This example checks if the value of the key `foo` is set in the cache and passes
* the result to the `var_dump` function. You can use any of the composition provided by
* [promises](https://github.com/reactphp/promise).
*
* NOTE: It is recommended that has() is only to be used for cache warming type purposes
* and not to be used within your live applications operations for get/set, as this method
* is subject to a race condition where your has() will return true and immediately after,
* another script can remove it making the state of your app out of date.
*
* @param string $key The cache item key.
* @return PromiseInterface<bool> Returns a promise which resolves to `true` on success or `false` on error
*/
public function has($key);
}