MAGETWO-98151: Add support ZooKeeper locks

Author: BaDos

lib/internal/Magento/Framework/Lock/LockBackendFactory.php

@@ -84,6 +84,10 @@ public function create(): LockManagerInterface
             throw new RuntimeException(new Phrase('Unknown locks provider.'));
         }
 
+        if (self::LOCK_ZOOKEEPER === $provider && !extension_loaded(self::LOCK_ZOOKEEPER)) {
+            throw new RuntimeException(new Phrase('php extension Zookeeper is not installed.'));
+        }
+
         return $this->objectManager->create($this->lockers[$provider], $config);
     }
 }

lib/internal/Magento/Framework/Lock/Test/Unit/Backend/ZookeeperTest.php

@@ -38,6 +38,9 @@ class ZookeeperTest extends TestCase
      */
     protected function setUp()
     {
+        if (!extension_loaded('zookeeper')) {
+            $this->markTestSkipped('Test was skipped because php extension Zookeeper is not installed.');
+        }
         $this->zookeeperProvider = new ZookeeperProvider($this->host, '/some/path/');
     }
 
@@ -49,6 +52,4 @@ public function testConstructionWithException()
     {
         $this->zookeeperProvider = new ZookeeperProvider('some host', '');
     }
-
-
 }