Fix support for php-fig/cache

src/ServiceAccountCacheItemPool.php

@@ -51,7 +51,7 @@ function __construct(array $config=null)
      * @return CacheItemInterface
      *   The corresponding Cache Item.
      */
-    public function getItem($key)
+    public function getItem(string $key): CacheItemInterface
     {
         return $this->cache->get(self::CACHE_PREFIX.$key)?:new Item($key);
     }
@@ -72,7 +72,7 @@ public function getItem($key)
      *   key is not found. However, if no keys are specified then an empty
      *   traversable MUST be returned instead.
      */
-    public function getItems(array $keys = array())
+    public function getItems(array $keys = array()): iterable
     {
         $items = [];
         foreach($keys AS $k){
@@ -98,7 +98,7 @@ public function getItems(array $keys = array())
      * @return bool
      *   True if item exists in the cache, false otherwise.
      */
-    public function hasItem($key)
+    public function hasItem($key): bool
     {
         return $this->cache->has(self::CACHE_PREFIX.$key);
     }
@@ -109,7 +109,7 @@ public function hasItem($key)
      * @return bool
      *   True if the pool was successfully cleared. False if there was an error.
      */
-    public function clear()
+    public function clear(): bool
     {
         $this->cache->flush();
         return true;
@@ -128,7 +128,7 @@ public function clear()
      * @return bool
      *   True if the item was successfully removed. False if there was an error.
      */
-    public function deleteItem($key)
+    public function deleteItem($key): bool
     {
         return $this->cache->delete(self::CACHE_PREFIX.$key);
     }
@@ -144,7 +144,7 @@ public function deleteItem($key)
      * @return bool
      *   True if the items were successfully removed. False if there was an error.
      */
-    public function deleteItems(array $keys)
+    public function deleteItems(array $keys): bool
     {
         foreach($keys AS $key){
             $this->deleteItem($key);
@@ -161,7 +161,7 @@ public function deleteItems(array $keys)
      * @return bool
      *   True if the item was successfully persisted. False if there was an error.
      */
-    public function save(CacheItemInterface $item)
+    public function save(CacheItemInterface $item): bool
     {
         try {
             $this->cache->set(self::CACHE_PREFIX.$item->getKey(), $item,$this->ttl);
@@ -180,7 +180,7 @@ public function save(CacheItemInterface $item)
      * @return bool
      *   False if the item could not be queued or if a commit was attempted and failed. True otherwise.
      */
-    public function saveDeferred(CacheItemInterface $item)
+    public function saveDeferred(CacheItemInterface $item): bool
     {
         $this->deferred[] = $item;
         return true;
@@ -192,12 +192,12 @@ public function saveDeferred(CacheItemInterface $item)
      * @return bool
      *   True if all not-yet-saved items were successfully saved or there were none. False otherwise.
      */
-    public function commit()
+    public function commit(): bool
     {
         foreach($this->deferred AS $item){
             if(!$this->save($item))
                 return false;
         }
         return true;
     }
-}
+}