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MEAN Stack

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MEAN Stack is a full-stack JavaScript solution that helps you build fast, robust and maintainable production web applications using MongoDB, Express, AngularJS, and Node.js.

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MEAN Stack

  1. 1. MEAN STACK KRISHNAPRASAD K 13MCA11020
  2. 2. Agenda • Introduction • What is LAMP? • Requirements for a modern web • What is MEAN? • What is MongoDB? • What is Express? • What is Angular JS? • What is Node.JS? • Disadvantages of MEAN STACK • Conclusion • Any Questions?
  3. 3. Introduction • MEAN is an opinionated full stack JavaScript framework which simplifies and accelerates web application development. • MEAN represents a major shift in architecture and mental models — from relational databases to NoSQL and from server-side Model-View-Controller to client-side, single-page applications. • MEAN is an acronym for Mongo DB, Express JS, Angular JS and Node. Js.
  4. 4. What is LAMP ? • Linux • Apache • MySQL • PHP • LAMP stack is a popular open source web platform commonly used to run dynamic web sites and servers. • It includes Linux, Apache, MySQL, and PHP/Python/Perl and is considered by many the platform of choice for development and deployment of high performance web applications which require a solid and reliable foundation.
  5. 5. Problems with LAMP? • Apache is not the fastest web server around • It’s hard to write good-to-read, reusable and fast PHP code • Frontend works with other languages than the backend • Too many conversions (XML to PHP to HTML, model to SQL) • There is no separated server-side and client-side development
  6. 6. Requirements for a modern web? • Customers want fast web sites/fast response times • No page reloads • Enterprises want to go virtual o One box + Several virtual images => Shared Hardware o System with minimal memory footprint/overhead needed • As many concurrent requests as possible • Only load resources when needed (conditional loading) • Mobile/Responsive UIs
  7. 7. What is MEAN Stack? MEAN Stack is a full-stack JavaScript solution that helps you build fast, robust and maintainable production web applications using MongoDB, Express, AngularJS, and Node.js.
  8. 8. • 100% free , 100% Open Source • 100% Java Script (+JSON and HTML) • 100% Web Standards • Consistent Models from the backend to the frontend and back • Use a uniform language throughout your stack o JavaScript (the language of the web) o JSON (the data format of the web) o No conversion needed for the database • Use JavaScript with a great framework (compared to jQuery) • Allows to start with the complete frontend development first • Very low memory footprint/overhead
  9. 9. Processing model
  10. 10. MongoDB MongoDB is a cross-platform document-oriented database - classified as a NoSQL database which eschews the traditional table-based relational database structure in favour of JSON-like documents with dynamic schemas.
  11. 11. What is MongoDB • Developed by software company 10gen (now MongoDB Inc.) • Fast NoSQL schemaless database written in C++ • Document-Oriented Storage o JSON-style documents with dynamic schemas • Full Index Support o Index on any attribute o Replication & High Availability • Auto-Sharding o Scale horizontally without compromising functionality
  12. 12. MongoDB RDBMS Collection Table Document Row Index Index Embedded Document Join Reference Foreign Key
  13. 13. Example >db.mycol.insert({ _id: ObjectId(7df78ad8902c), title: 'MongoDB Overview', description: 'MongoDB is no sql database', by: 'tutorials point', url: 'http://www.tutorialspoint. com', tags: ['mongodb', 'database', 'NoSQL'], likes: 100 })
  14. 14. MongoDB - Document
  15. 15. MongoDB - Collection
  16. 16. MongoDB – Query a database
  17. 17. Advantages And Disadvantages Advantages • Lightening fast. • Auto sharding. • Replication is very easy. • You can perform rich queries, can create on the fly indexes with a single command. Disadvantages • Very unreliable • Indexes take up a lot of RAM. o B-tree indexes
  18. 18. Express JS Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.
  19. 19. What is Express ? • Node JS based web framework • Based on connect middleware • Makes usage of Node JS even easier • Easy to implement REST API • Easy to implement session management • Supports several template rendering engines (Jade, EJS) o Supports partials -> so you can split your HTML in fragments • Asynchronous • Implements MVC pattern
  20. 20. Express – What is it? • Allows to set up middlewares to respond to HTTP Requests. • Defines a routing table which is used to perform different action based on HTTP Method and URL. • Allows to dynamically render HTML Pages based on passing arguments to templates.
  21. 21. Example var express = require('express'); var app = express(); app.get('/', function (req, res) { res.send('Hello World!'); }); app.listen(3000, function () { console.log('Example app listening on port 3000!'); });
  22. 22. Advantages And Disadvantages Advantages • Regardless of complexity, there should be very few roadblocks if you know JavaScript well. • Supports concurrency well. • Fast and the performance is comparable with Golang micro frameworks and Elixir's Phoenix. Disadvantages • There is no built in error handling methods.
  23. 23. What is Angular? AngularJS is an open-source JavaScript framework, maintained by Google, that assists with running single-page applications. • Its goal is to augment browser-based applications with model–view–controller (MVC) capability, in an effort to make both development and testing easier.
  24. 24. AngularJS • JavaScript framework developed by Google • Based on Model-View-* Pattern (client-side) o MVC/MVVM o Bi-Directional Data Binding • Declarative Programming (focus on what – not the how!) o Directives are integrated in HTML directly o DOM Manipulations completely hidden • Great for Frontend development o Great for SPA (Single Page Applications) o Great for mobile apps • Very modular and extensible o Makes testing an ease • Great Browser support (> IE8) • Well documented
  25. 25. Two Way Data-binding
  26. 26. AngularJs directives • ng-app o Declares an element as a root element of the application allowing behaviour to be modified through custom HTML tags. • ng-bind o Automatically changes the text of a HTML element to the value of a given expression. • ng-model o Similar to ng-bind, but allows two-way data binding between the view and the scope. • ng-controller o Specifies a JavaScript controller class that evaluates HTML expressions.
  27. 27. AngularJs directives • ng-repeat o Instantiate an element once per item from a collection. • ng-show & ng-hide o Conditionally show or hide an element, depending on the value of a boolean expression. • ng-switch o Conditionally instantiate one template from a set of choices, depending on the value of a selection expression. • ng-view o The base directive responsible for handling routes that resolve JSON before rendering templates driven by specified controllers.
  28. 28. Advantages and Disadvantages Advantages • Fast development • Makes developing SPA easy • Awesome performance • Make apps scalable Disadvantages • Good for IO driven apps only (not games)
  29. 29. Node JS Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. • Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
  30. 30. What is Node JS ? • Written in C/C++ o Can also use C libraries • Built on top of Chrome’s V8 engine – so pure JavaScript! o Therefore based on latest ECMAScript 5 • Framework to build asynchronous I/O applications • Single Threaded – no concurrency bugs – no deadlocks! o Not internally though – but we’ll get to that • One node process = one CPU Core
  31. 31. What is Node JS continue • Can easily handle 10k concurrent connections o Doesn’t have any problems with concurrency o Doesn’t create much overhead (CPU/Memory) • Easily scalable (just create a cluster) • Very fast (well, it’s mostly C code) • Installation and first server start within less than 5 minutes o REST-API that replies to GET requests can be implemented in less than 5 minutes as well! • It’s not a web framework!
  32. 32. Blocking I/O vs. Non-Blocking I/O
  33. 33. Example var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('HelloWorldn'); }).listen(80); console.log('Server listening on port 80');
  34. 34. Advantage and Disadvantage Advantages • Node.js is fast • The ever-growing NPM • Real-time web apps • Productivity Disadvantages • JavaScript's semantics and culture
  35. 35. Disadvantages of mean Stack • There are still no general JS coding guidelines • MongoDB is not as robust as an SQL server o This security is what they sacrifice to gain speed • Once you’ve created the first site with this technology, it’s hard to go back to the old approach
  36. 36. Conclusion In the end, Mean is a full stack, Javascript, web application framework. If you require a fast, easy, simple way to create a modern, responsive, dynamic web site then MEAN would be a great solution.
  37. 37. References • http://www.mean.io • https://angularjs.org • http://mongodb.org • https://nodejs.org • http://expressjs.com • http://slideshare.net
  38. 38. Any Questions ? ?
  39. 39. THANK YOU

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