Merge pull request #6 from php-cache/callable

Callable

composer.json

@@ -31,14 +31,14 @@
         "php":                  "^5.5|^7.0",
         "ext-redis":            "*",
         "psr/cache":            "1.0.0",
-        "cache/adapter-common": "^0.1.2",
+        "cache/adapter-common": "^0.2",
         "cache/taggable-cache": "^0.3",
-        "cache/hierarchical-cache": "^0.1"
+        "cache/hierarchical-cache": "^0.2"
     },
     "require-dev":
     {
         "phpunit/phpunit":         "^5.1|^4.0",
-        "cache/integration-tests": "dev-master"
+        "cache/integration-tests": "^0.7"
     },
     "provide":
     {

src/RedisCachePool.php

@@ -38,7 +38,11 @@ public function __construct(\Redis $cache)
 
     protected function fetchObjectFromCache($key)
     {
-        return unserialize($this->cache->get($this->getHierarchyKey($key)));
+        if (false === $result = unserialize($this->cache->get($this->getHierarchyKey($key)))) {
+            return [false, null];
+        }
+
+        return $result;
     }
 
     protected function clearAllObjectsFromCache()
@@ -58,12 +62,13 @@ protected function clearOneObjectFromCache($key)
 
     protected function storeItemInCache($key, CacheItemInterface $item, $ttl)
     {
-        $key = $this->getHierarchyKey($key);
+        $key  = $this->getHierarchyKey($key);
+        $data = serialize([true, $item->get()]);
         if ($ttl === null) {
-            return $this->cache->set($key, serialize($item));
+            return $this->cache->set($key, $data);
         }
 
-        return $this->cache->setex($key, $ttl, serialize($item));
+        return $this->cache->setex($key, $ttl, $data);
     }
 
     protected function getValueFormStore($key)