I'm not entirely certain what you mean in the second part of your question: "whether we can bring data from server side and do manipulation on that instead of data being brought from inside tableau?" Depending on your data source, there are ways to either have Tableau update the data (using SQL pass through) or by using a URL action to call a web service or web application that will manipulate the data on the back end. Can you clarify what you are trying to do?
Thank you for your immediate response. I would like to claify the question. I meant like does tabuleau has any API for using payload from existing webservice. I got a response for my earlier question that it has a RESTful like webservice for OData.
Version 8 will have an API set for creating native data connectors to ANY data source. So you could use them to program a connection to your webservices or to a rss feed or a wiki page or any type of data... very exciting.
I also want to know something.
Someone having any idea then do share please.