Unlocking Restricted Functions Through Angular Factories

I have been working on an Angular factory that utilizes the revealing module pattern to expose a service interface. The factory relies on injected dependencies to support the public service, which are not explicitly included in the public service itself. While I understand why the code below is not functioning as expected, I am struggling to find a standard design pattern to address this issue. I am looking for guidance on how to access private members and functions when invoking the public service. If a controller calls myfactory.initData();, the private functions and variables are currently inaccessible.

(function () {
    'use strict';

    angular.module('app').factory('myFactory', ['common', 'config', myFactory]);

    function myFactory(common, config) {       
        var data = { cogs: [], widgets: [] };
        var dep = config.dependency;

        // Define the factory service 
        var service = {
            data: data,            
            initData: initData,
            reset: reset            
        };   
        return service;  

        function initData(forceRefresh) {
            _private1(); // Currently out of scope, not part of the returned service
            _private2(); // Currently out of scope, not part of the returned service
        }        

        function _private1() {
            // Access non-exposed private method to get cogs
            dep.f1();
        }

        function _private1() {
            // Access non-exposed private method to get widgets
            dep.f2();
        }
    }
})();

Answer №1

The inability to access private functions is due to the absence of references within scope. To resolve this issue, store the private functions in a variable:

(function () {
    'use strict';

    angular.module('app').factory('myFactory', ['common', 'config', myFactory]);

    function myFactory(common, config) {       
        var data = { cogs: [], widgets: [] };
        var dep = config.dependency; 

        var _private1 = function() {
            // get cogs, from non-exposed private
            dep.f1();
        }

        var _private1 = function() {
            // get cogs, from non-exposed private
            dep.f2();
        }

        // Define the factory service
        var service = {
            data: data,            
            initData: initData,
            reset: reset            
        };   
        return service; 

        function initData(forceRefresh) {
            _private1(); // out of scope, not part of returned service
            _private2(); // out of scope, not part of returned service
        }  
    }
})();

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