protected function createStorageInstance()
 {
     $storageClient = null;
     if (TESTS_ZEND_SERVICE_WINDOWSAZURE_BLOB_RUNONPROD) {
         $storageClient = new Blob(TESTS_ZEND_SERVICE_WINDOWSAZURE_BLOB_HOST_PROD, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_ACCOUNT_PROD, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_KEY_PROD, false, AbstractRetryPolicy::retryN(10, 250));
         $storageClient->setCredentials(new SharedAccessSignature(TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_ACCOUNT_PROD, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_KEY_PROD, false));
     } else {
         $storageClient = new Blob(TESTS_ZEND_SERVICE_WINDOWSAZURE_BLOB_HOST_DEV, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_ACCOUNT_DEV, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_KEY_DEV, true, AbstractRetryPolicy::retryN(10, 250));
         $storageClient->setCredentials(new SharedAccessSignature(TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_ACCOUNT_DEV, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_KEY_DEV, true));
     }
     if (TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_USEPROXY) {
         $storageClient->setProxy(TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_USEPROXY, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_PROXY, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_PROXY_PORT, TESTS_ZEND_SERVICE_WINDOWSAZURE_STORAGE_PROXY_CREDENTIALS);
     }
     return $storageClient;
 }