Example, how to cache a request with loopback

lbdecorators.js

'use strict';

angular.module('lbServices')
.config(function($provide) {

    // store if a request is being processed
    var pending = false;

    $provide.decorator('Access_credential', function($delegate, $q, $cacheFactory){

        // store the original method
        let getCurrent = $delegate.getCurrent;

        // create a cache Object
        let userCache = $cacheFactory('userCache');

        // override the getCurrent method
        $delegate.getCurrent = function(){

            // create a promise
            let deferred = $q.defer();

            // if the user is cached
            var currentUser = userCache.get('currentUser');
            if(currentUser !== undefined){
                deferred.resolve(currentUser);
            }
            // if the user is not cached
            else if(!pending){

                pending = true;

                getCurrent().$promise
                .then(function(user){
                    userCache.put('currentUser', user);
                    pending = false;
                    deferred.resolve(user);
                })
                .catch(deferred.reject);
            }

            return deferred.promise;
        };

        // provide a method to clear the cache
        $delegate.prototype.bustCache = function() {
            userCache.remove('currentUser');
        };

        return $delegate;
    });
});