Factory + Inheritance

factory_plus_inheritance.js

'use strict';

class ImportDaoInterface {

    /**
        This methods contract is x, y, z
    */
    getOrders(dateRange, cb) {
        throw 'Extend Me!'
    }

}



class GrubhubImportDao extends ImportDaoInterface {

    getOrders(dateRange, cb) {
        process.nextTick(function(){
            cb(false, [])
        })
    }

}



function ImportDaoFactory(whichOne){
    //try {
    //    var importDao = new require('../dao/'+whichOne+'Dao')
    //} catch (e) {
    //    throw new Error('Not Implemented')
    //}
    // the above for production, but for this all-in-one test case:
    var importDao = new GrubhubImportDao

    // can do factory things here if want to, like:
    var getOrdersWrapper = importDao.getOrders
    importDao.getOrders = function(dateRange,cb){
        getOrdersWrapper(dateRange,function(err,orders){
            if (err) {
                console.log('report error to sentry, etc')
            }
            cb(err,orders)
        })
    }

    return importDao
}



// test...
ImportDaoFactory('GrubhubImport').getOrders('last 3 hours', function(err,orders){
    console.log('orders=',orders)
})

https://gist.github.com/dbercht/f6dc3f61254f0ce2cc5c27f5ff365a18