Class('DataStore.Async', {

    trait : JooseX.CPS,


    continued : {

        methods : {

            log : function () {
                var resultFromLog = // somehow get the response from logging operation

                this.CONTINUE(resultFromLog)

                return whatever
            },


            save : function (data) {
                this.log().then(function (resultFromLog) {

                    var CONT = this.CONT

                    require('fs').saveFile('filename.txt', data, function (err, written) {
                        if (err) {
                            CONT.THROW(err)

                            return
                        }

                        CONT.CONTINUE(written)
                    })
                }).now()
            }
        }
    }
})


var store = new DataStore.Async


store.save('some data').then(function (written) {

    // do smth

}).CATCH(function (exception) {

    // do smth

}).FINALLY(function () {

    // do smth

}).now()