/**
  * Send customer-buys-item events to PredictionIO for all existing orders
  *
  * @param $customerId
  * @param $products
  * @return bool
  */
 protected function _sendPurchaseEvent($customerId, $products)
 {
     foreach ($products as $productId) {
         if (!$this->_eventClient->saveCustomerBuyProduct($customerId, $productId)) {
             return false;
         }
     }
     return true;
 }