Global registry "sync" map proxy

global-registry.js

// global-registry.js
// "private" registry of map proxies
const _mapRegistry = [];
window.RV._mapRegistry = _mapRegistry;

const mapProxy = {
    _appInstance: null,

    _proxy(action, ...args) {
        this._appInstance.then(appInstance => 
            appInstance[action](...args)
        );
    }

    addRcsLayer(keys) {
        this._proxy('addRcsLayer', keys);
    },

    switchLanguage(lang) {
        this._proxy('switchLanguage', lang);
    },

    _init(id) {
        this._appInstance = new Promise((resolve, reject) {
            // store a callback function in the proxy object itself for map instances to call upon readiness
            this._registerMap = appInstance => {
                // store actual instance of the map; after this point, all queued calls to `addRcsLayer`, `switchLanguage`, etc. will trigger
                this._appInstance = appInstance;
                resolve();
            });
    }
};


// external "sync" function to retrieve a map instance
// in reality it returns a map proxy queueing calls to the map until it's ready 
window.RV.getMap = getMap;

function getMap(id) {
    return _mapRegistry[id];
}


// app-seed.js
// move some app-seed code into the injector (can read configs here as well)
nodes.forEach(node => {

    const id = ???; // id of a map instance
    
    _mapRegistry[id] = Object.create(mapProxy)._init(id);

});


// core.run.js
// somewhere in core.run.js
$rootScope.$on(events.rvReady, () => {
    globalRegistry._mapRegistry[$rootElement.attr('id')]._registerMap(service);
});

const mapProxy = {
        _appInstance: null,

        _proxy(action, ...args) {
            this._appInstance.then(appInstance =>
                appInstance[action](...args)
            );
        },

        addRcsLayer(keys) {
            this._proxy('addRcsLayer', keys);
        },

        switchLanguage(lang) {
            this._proxy('switchLanguage', lang);
        },

        _init(id) {
            this._appInstance = new Promise((resolve, reject) => {
                // store a callback function in the proxy object itself for map instances to call upon readiness
                this._registerMap = appInstance => {
                    // store actual instance of the map; after this point, all queued calls to `addRcsLayer`, `switchLanguage`, etc. will trigger
                    this._appInstance = appInstance;
                    resolve();
                }
            });
        }
    };