index.js

var rpc = require('../../custom_node_modules/rabbitmq-rpc')();
var Q = require('q');

api = {

    patient: null,
    promiseMap: {},

    call: function(addr, data, token){
        var deferred = Q.defer();
        token = token || 'NURSE';

        rpc.call(
            data,
            addr,
            function(response){
               var nResponse = JSON.parse(response);
               if(200 === nResponse.status)
                   deferred.resolve(nResponse.result);
               else
                   deferred.reject(nResponse);
            },
            token
        );

        return deferred.promise;
    },

    createPatient: function(model){
        var api = this;
        var p = this.call(
            '/test/patient/create/',
            {'patient':model}
        ).then(function(patient){
            api.patient = patient;
            return patient;
        });
        api.promiseMap.patient = p;
        return p;
    },

    getPatient: function(){
        var api = this;
        if(!api.patient && !api.promiseMap.patient){
            return api.createPatient({
                'firstName': 'firstName',
                'lastName': 'lastName'
            });
        }

        if(!api.patient)
            return api.promiseMap.patient;

        return Q.fcall(function(){
            return api.patient;
        });
    },

    getAppointment: function(){
        return Q.fcall(function(){
            return {
                id: 1396,
                duration: 900,
                patient: {
                    id: 659
                }
            };
        });
    }
};


module.exports = api;