izzum\statemachine\persistence\MongoDB::insertState PHP Method

    protected function insertState(Identifier $identifier, $state, $message = null)
    {
        try {
            $data = new \stdClass();
            $data->timestamp = time();
            $data->state = $state;
            $data->entity_id = $identifier->getEntityId();
            $data->machine = $identifier->getMachine();
            //insert into the 'states' collection
            //https://php.net/manual/en/mongocollection.insert.php
            $this->getClient()->izzum->states->insert($data);
        } catch (\Exception $e) {
            throw new Exception(sprintf('query for inserting state failed: [%s]', $e->getMessage()), Exception::PERSISTENCE_LAYER_EXCEPTION);
        }
    }