* Switched to using psr/simple-cache from psr/cache

README.md

@@ -77,8 +77,8 @@ with dev requirements for them to work.
 # External Documentation
 Links to documentation for external dependencies:
 * [PHP Docs](http://php.net/)
-* [Logging PSR-3](http://www.php-fig.org/psr/psr-3/)
-* [Cache PSR-6](http://www.php-fig.org/psr/psr-6/)
+* [Logging PSR-3](http://www.php-fig.org/psr/psr-3/) ([GitHub page](https://github.com/php-fig/log))
+* [Simple Cache PSR-16](http://www.php-fig.org/psr/psr-16/) ([GitHub page](https://github.com/php-fig/simple-cache))
 
 Links to documentation for development only external dependencies:
 * [cache/cache](http://www.php-cache.com/en/latest/)

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": ">=7.0",
-        "psr/cache": "~1.0",
+        "psr/simple-cache": "~1.0.0",
         "psr/log": "~1.0"
     },
     "autoload": {

src/Cache/NullCache.php

@@ -0,0 +1,148 @@
+<?php
+
+namespace MadeSimple\TaskWorker\Cache;
+
+use DateInterval;
+use Psr\SimpleCache\CacheInterface;
+
+/**
+ * Class NullCache
+ *
+ * @package MadeSimple\TaskWorker\Cache
+ * @author  Peter Scopes
+ */
+class NullCache implements CacheInterface
+{
+
+    /**
+     * Fetches a value from the cache.
+     *
+     * @param string $key     The unique key of this item in the cache.
+     * @param mixed  $default Default value to return if the key does not exist.
+     *
+     * @return mixed The value of the item from the cache, or $default in case of cache miss.
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if the $key string is not a legal value.
+     */
+    public function get($key, $default = null)
+    {
+        return null;
+    }
+
+    /**
+     * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
+     *
+     * @param string                $key   The key of the item to store.
+     * @param mixed                 $value The value of the item to store, must be serializable.
+     * @param null|int|DateInterval $ttl   Optional. The TTL value of this item. If no value is sent and
+     *                                     the driver supports TTL then the library may set a default value
+     *                                     for it or let the driver take care of that.
+     *
+     * @return bool True on success and false on failure.
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if the $key string is not a legal value.
+     */
+    public function set($key, $value, $ttl = null)
+    {
+        return true;
+    }
+
+    /**
+     * Delete an item from the cache by its unique key.
+     *
+     * @param string $key The unique cache key of the item to delete.
+     *
+     * @return bool True if the item was successfully removed. False if there was an error.
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if the $key string is not a legal value.
+     */
+    public function delete($key)
+    {
+        return true;
+    }
+
+    /**
+     * Wipes clean the entire cache's keys.
+     *
+     * @return bool True on success and false on failure.
+     */
+    public function clear()
+    {
+        return true;
+    }
+
+    /**
+     * Obtains multiple cache items by their unique keys.
+     *
+     * @param iterable $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 iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if $keys is neither an array nor a Traversable,
+     *   or if any of the $keys are not a legal value.
+     */
+    public function getMultiple($keys, $default = null)
+    {
+        return array_fill_keys($keys, null);
+    }
+
+    /**
+     * Persists a set of key => value pairs in the cache, with an optional TTL.
+     *
+     * @param iterable              $values A list of key => value pairs for a multiple-set operation.
+     * @param null|int|DateInterval $ttl    Optional. The TTL value of this item. If no value is sent and
+     *                                      the driver supports TTL then the library may set a default value
+     *                                      for it or let the driver take care of that.
+     *
+     * @return bool True on success and false on failure.
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if $values is neither an array nor a Traversable,
+     *   or if any of the $values are not a legal value.
+     */
+    public function setMultiple($values, $ttl = null)
+    {
+        return true;
+    }
+
+    /**
+     * Deletes multiple cache items in a single operation.
+     *
+     * @param iterable $keys A list of string-based keys to be deleted.
+     *
+     * @return bool True if the items were successfully removed. False if there was an error.
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if $keys is neither an array nor a Traversable,
+     *   or if any of the $keys are not a legal value.
+     */
+    public function deleteMultiple($keys)
+    {
+        return true;
+    }
+
+    /**
+     * Determines whether an item is present in the cache.
+     *
+     * 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 bool
+     *
+     * @throws \Psr\SimpleCache\InvalidArgumentException
+     *   MUST be thrown if the $key string is not a legal value.
+     */
+    public function has($key)
+    {
+        return true;
+    }
+}