public function getNewMessagesForConversation($conversationId, $lastMessageTimestamp = null)
{
if (($conversation = $this->getConversation($conversationId)) === null) {
return array();
}
if (empty($lastMessageTimestamp)) {
$lastMessageTimestamp = time();
}
$result = array();
$messageList = $this->messageDao->findConversationMessagesByLastMessageTimestamp($conversation->id, $lastMessageTimestamp);
foreach ($messageList as $message) {
$result[] = $this->getMessageDataForApi($message);
}
return $result;
}