Inversion of Control vs Dependency Injection
According to the paper written by Martin Fowler, inversion of control is the principle where the control flow of a program is inverted: instead of the programmer controlling the flow of a program, the external sources (framework, services, other components) take control of it. It's like we plug something into something else. He mentioned an example about EJB 2.0: For example the Session Bean inter
What are MVP and MVC and what is the difference?
When looking beyond the RAD (drag-drop and configure) way of building user interfaces that many tools encourage you are likely to come across three design patterns called Model-View-Controller, Model-View-Presenter and Model-View-ViewModel. My question has three parts to it: What issues do these patterns address? How are they similar? How are they different?
Thread per connection vs Reactor pattern (with a thread pool)?
I want to write a simple multiplayer game as part of my C++ learning project. So I thought, since I am at it, I would like to do it properly, as opposed to just getting-it-done. If I understood correctly: Apache uses a Thread-per-connection architecture, while nginx uses an event-loop and then dedicates a worker [x] for the incoming connection. I guess nginx is wiser, since it supports a higher co
What is the difference between event driven model and reactor pattern?
The reactor pattern is more specific than "event driven programming". It is a specific implementation technique used when doing event driven programming. However, the term is not used with much accuracy in typical conversation, so you should be careful about using it and expecting your audience to understand you, and you should be careful in how you interpret the term when you encounter its use. O
How does LMAX's disruptor pattern work?
The Google Code project does reference a technical paper on the implementation of the ring buffer, however it is a bit dry, academic and tough going for someone wanting to learn how it works. However there are some blog posts that have started to explain the internals in a more readable way. There is an explanation of ring buffer that is the core of the disruptor pattern, a description of the cons
What is the difference between a mixin and the decorator pattern?
A mixin is apt when you're adding some behavior to your class. e.g. the ability to enumerate in case of a collection type. You can mixin as many sets of behavior into your class as you want. Its a nice way to reuse common code ; you basically get a bunch of methods for free. A decorator on the other hand is more of a sneaky interceptor. It exposes the same public interface as the target object, co
What is an efficient way to implement a singleton pattern in Java?
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Can Scala's Cake Pattern be implemented in Haskell?
Using a number of newer language features in Scala it's possible to implement a composable component system and create components using the so called Cake Pattern, described by Martin Odersky in the paper Scalable Component Abstractions and also in a recent talk. Several of the Scala features used in the Cake Pattern have corresponding Haskell features. For example, Scala implicits correspond to H
JavaScript pattern for constructing proxy objects, using classical inheritance
Although not finalized, I am experimenting with ES6 Proxies. My goal is to have a constructor function (one that utilizes classical inheritance like the one shown below) for creating proxy objects with inheritance chains. function inherit(child, parent){ //a classical inheritance pattern var F = function(){}; F.prototype = parent.prototype; child.prototype = new F(); child.parent = parent.prototyp
_Best Practices for JSDoc'ing Javascript files written in the "revealing module pattern" Style?
Most of my Javascript functions are relatively simple, and called for their sideeffects: I use jQuery to manipulate the DOM or make Ajax-calls. I prefer to write my functions in the "revealing module pattern" style. I just discovered that JSDoc- annotating Javascript files has a benefit: with the help of the annotations, Eclipse's JS Development Tools can parse my JS file and fill the Eclipse Outl
Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
What's the exact reason for using dispatch_once in the shared instance accessor of a singleton under ARC? + (MyClass *)sharedInstance { // Static local predicate must be initialized to 0 static MyClass *sharedInstance = nil; static dispatch_once_t onceToken = 0; dispatch_once(&onceToken, ^{ sharedInstance = [[MyClass alloc] init]; // Do any other initialisation stuff here }); return sharedInstance
some confusions to singleton pattern in PHP
In my team I've been told to write resource class like this style: class MemcacheService { private static $instance = null; private function __construct() { } public static function getInstance($fortest = false) { if (self::$instance == null) { self::$instance = new Memcached(); if ($fortest) { self::$instance->addServer(MEMTEST_HOST, MEMTEST_PORT); } else { self::$instance->addServer(MEM_HOST, ME
Javascript: best Singleton pattern
Possible Duplicate: Simplest/Cleanest way to implement singleton in JavaScript? I'm using this pattern for singletons, in the example the singleton is PlanetEarth: var NAMESPACE = function () { var privateFunction1 = function () { privateFunction2(); }; var privateFunction2 = function () { alert('I\'m private!'); }; var Constructors = {}; Constructors.PlanetEarth = function () { privateFunction1()
PHP singleton database connection pattern
I've been working on a small project using PHP and MySQL. I've read a lot around about best practices on managing a connection and so on. I've also implemented (following some posts found around) a singleton class to manage MySQL connections. require_once 'config.inc.php'; class DbConn { private static $instance; private $dbConn; private function __construct() {} /** * * @return DbConn */ private
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What's an Aggregate Root?
What are the differences between Deferred, Promise and Future in JavaScript?
Are there any good resources for the Actor Model in Common Lisp, and good documents on the Actor Model in general?
JavaScript module pattern with example
Difference between static class and singleton pattern?