I have found solution for my problem. I have to say it's not that perfect as I was looking for, but so far it works and I think about that more as temporarily work around.

$.post( url1, function( data)

{

     // do some computation on data and then

     setSomeValue( data);

});



var setSomeValue = ( function()

{

    var cache = {};

    return function( data)

    {

        if ( cache[data] == updating)

        {

             setTimeout( function(){ setSomeValue( data);}, 100);

             return;

        }

        if ( !cache[date])

        {

             cache[date] = updating;

             $.post( url2, function( another_data)

             {

                  //make heavy computation on another_data

                  cache[data] = value;

                  // update the UI with value

             });

        }

        else

        {

             //update the UI using cached value

        }

    }

})();