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JC Olamendy's Thoughts | Using Lean Startup and Software Architecture principles to change the world
Using Lean Startup and Software Architecture principles to change the world (by JC Olamendy)
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    JC Olamendy's Thoughts | Using Lean Startup and Software Architecture principles to change the world
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    Using Lean Startup and Software Architecture principles to change the world (by JC Olamendy)
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    Using Lean Startup and Software Architecture principles to change the world. A tutorial on Node. In this world of high performance (low response time on almost real-time communication) and scalable (involving millions of user requests) Web applications, Node. js is gaining popularity everyday. Some says that Node. js is the hottest technology at Silicon Valley used by tech giants such as VMWare, Microsoft, LinkedIn, eBay, Yahoo, etc. Let’s say what is Node. In simple words, Node. js is an event-driven JavaScript runtime environment on the server-side. js runs using V8 JavaScript engine developed by Google and achieves high throughput via non-blocking (asynchronous) I/O in a single-threaded event loop as well as due to the fact that V8 compiles JavaScript code at high speeds into native machine code. The real magic behind the high performance on Node. js is the event loop. In order to scale to large volumes of user requests, all I/O intensive operations are performed asynchronously. The traditional threaded approach where for processing each user request a new thread is created is cumbersome and consumes large unnecessary resources specifically memory. To avoid this inefficiency and simplify the traditional multi-threaded programming approach, then Node. js maintains an event loop which manages all asynchronous operations for you. js application needs to execute an intensive operations (I/O operations, heavy computation), then an asynchronous task is sent to the event loop along with a callback function, and then keep on executing the rest of the application. Then the event loop keeps track the execution status of the asynchronous task, and when it completes the callback is executed/called by returning results to the application. The event loop efficiently manages a thread pool and optimized the execution of tasks. Leaving this responsibility to the event loop, allows the developers to focus on the application logic for solving the real problem and finally simplifying the asynchronous programming. Now, let’s go to the practical part of this article. We’re going to install Node. js, and create a MVC framework for starting to develop our Web application. In order to install Node. js, we need to follow the simple instruction in the official site at https://github.com/joyent/node/wiki/Installation. Our MVC framework comprises of the following architectural building blocks:. a HTTP server for serving HTTP requests. Unlike other development stack where the application server (ex, Tomcat) and web server (ex, Apache) are distinct modules in the solution architecture, in Node. js not only we implement the application but also we implement the HTTP server. a router in order to map HTTP requests to request handlers. This mapping is based on the URL of the request. a set of request handlers to fulfill/process the HTTP requests arrived to the server. a set of view to present data/forms to the end user. a request data binding mechanism in order to understand correctly the data carried onthe incoming HTTP request payload. It’s remarkable to say that we’re going to implement each building block on its underlying module in order to follow/comply the very architectural principles: separation of responsibilities to achieve loosely coupling and high cohesion. In this section, we’re going to implement the HTTP server building block of our architecture. Let’s create the server. js module in the root directory of the framework with the following code in Listing 01. var http = require(“http”);. log(“HTTP request has arrived”);. log(“Server has started at http://localhost:8888/“);. Let’s analyze the previous code. The first line requires the http module that ships with Node. js and make it accessible through the variable http. This module exposes the createServer function which returns an object, and this object has method listen which receives as input parameter the port is going to listen on. The createServer function receives as input parameter ...
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