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 In this article, by Einar Ingebrigtsen , author of the book, SignalR Blueprints , we will focus on a different programming model for client development: Model-View-ViewModel ( MVVM ). It will reiterate what you have already learned about SignalR, but you will also start to see a recurring theme in how you should architect decoupled software that adheres to the SOLID principles. It will also show the benefit of thinking in single page application terms (often referred to as Single Page Application ( SPA )), and how SignalR really fits well with this idea.

Applications of WebRTC

 This article is by Andrii Sergiienko , the author of the book WebRTC Cookbook . WebRTC is a relatively new and revolutionary technology that opens new horizons in the area of interactive applications and services. Most of the popular web browsers support it natively (such as Chrome and Firefox) or via extensions (such as Safari). Mobile platforms such as Android and iOS allow you to develop native WebRTC applications. In this article, we will cover the following recipes: Creating a multiuser conference using WebRTCO Taking a screenshot using WebRTC Compiling and running a demo for Android

Putting It All Together – Community Radio

In this article by Andy Matthews , author of the book Creating Mobile Apps with jQuery Mobile, Second Edition , we will see a website where listeners will be greeted with music from local, independent bands across several genres and geographic regions. Building this will take many of the skills, and we'll pepper in some new techniques that can be used in this new service. Let's see what technology and techniques we could bring to bear on this venture. In this article, we will cover: A taste of Balsamiq Organizing your code An introduction to the Web Audio API Prompting the user to install your app New device-level hardware access To app or not to app Three good reasons for compiling an app

YARN and Hadoop

In this article, by the authors, Amol Fasale and Nirmal Kumar , of the book, YARN Essentials , you will learn about what YARN is and how it's implemented with Hadoop. YARN. YARN stands for Yet Another Resource Negotiator . YARN is a generic resource platform to manage resources in a typical cluster. YARN was introduced with Hadoop 2.0, which is an open source distributed processing framework from the Apache Software Foundation. In 2012, YARN became one of the subprojects of the larger Apache Hadoop project. YARN is also coined by the name of MapReduce 2.0. This is since Apache Hadoop MapReduce has been re-architectured from the ground up to Apache Hadoop YARN. Think of YARN as a generic computing fabric to support MapReduce and other application paradigms within the same Hadoop cluster; earlier, this was limited to batch processing using MapReduce. This really changed the game to recast Apache Hadoop as a much more powerful data processing system. With the advent of YARN, Hadoop now looks very different compared to the way it was only a year ago. YARN enables multiple applications to run simultaneously on the same shared cluster and allows applications to negotiate resources based on need. Therefore, resource allocation/management is central to YARN. YARN has been thoroughly tested at Yahoo! since September 2012. It has been in production across 30,000 nodes and 325 PB of data since January 2013. Recently, Apache Hadoop YARN won the Best Paper Award at ACM Symposium on Cloud Computing ( SoCC ) in 2013!

Postgres Add-on

In this article by Patrick Espake , author of the book Learning Heroku Postgres , you will learn how to install and set up PostgreSQL and how to create an app using Postgres.

Controlling DC motors using a shield

 In this article by Richard Grimmett , author of the book Intel Galileo Essentials ,let's graduate from a simple DC motor to a wheeled platform. There are several simple, two-wheeled robotics platforms. In this example, you'll use one that is available on several online electronics stores. It is called the Magician Chassis, sourced by SparkFun. The following image shows this:

Getting Up and Running with Cassandra

As an application developer, you have almost certainly worked with databases extensively. You must have built products using relational databases like MySQL and PostgreSQL, and perhaps experimented with a document store like MongoDB or a key-value database like Redis. While each of these tools has its strengths, you will now consider whether a distributed database like Cassandra might be the best choice for the task at hand. In this article by Mat Brown , author of the book Learning Apache Cassandra , we'll talk about the major reasons to choose Cassandra from among the many database options available to you. Having established that Cassandra is a great choice, we'll go through the nuts and bolts of getting a local Cassandra installation up and running. By the end of this article, you'll know: When and why Cassandra is a good choice for your application How to install Cassandra on your development machine How to interact with Cassandra using cqlsh How to create a keyspace

Booting the System

 In this article by William Confer and William Roberts , author of the book, Exploring SE for Android , we will learn once we have an SE for Android system, we need to see how we can make use of it, and get it into a usable state. In this article, we will: Modify the log level to gain more details while debugging Follow the boot process relative to the policy loader Investigate SELinux APIs and SELinuxFS Correct issues with the maximum policy version number Apply patches to load and verify an NSA policy

RESTful Web Service Mocking and Testing with SoapUI, RAML, and a JSON Slurper Script Assertion

In this article written by Rupert Anderson , the author of SoapUI Cookbook , we will cover the following topics: Installing the SoapUI RAML plugin Generating a SoapUI REST project and mock service using the RAML plugin Testing response values using JSON Slurper As you might already know, despite being called SoapUI, the product actually has an excellent RESTful web service mock and testing functionality. Also, SoapUI is very open and extensible with a great plugin framework. This makes it relatively easy to use and develop plugins to support APIs defined by other technologies, for example RAML ( ) and Swagger ( ). If you haven't seen it before, RESTful API Modeling Language or RAML is a modern way to describe RESTful web services that use YAML and JSON standards. As a brief demonstration, this article uses the excellent SoapUI RAML plugin to: Generate a SoapUI REST service definition automatically from the RAML definition Generate a SoapUI REST mock with an example response automatically from the RAML definition Create a SoapUI TestSuite , TestCase , and TestStep to call the mock Assert that the response contains the values we expect using a Script Assertion and JSON Slurper to parse and inspect the JSON content This article assumes that you have used SoapUI before, but not RAML or the RAML plugin. If you haven't used SoapUI before, then you can still give it a shot, but it might help to first take a look at Chapters 3 and 4 of the SoapUI Cookbook or the Getting Started , REST , and REST Mocking sections at .

Introducing Web Application Development in Rails

In this article by Syed Fazle Rahman , author of the book Bootstrap for Rails ,we will learn how to present your application in the best possible way, which has been the most important factor for every web developer for ages. In this mobile-first generation, we are forced to go with the wind and make our application compatible with mobiles, tablets, PCs, and every possible display on Earth. Bootstrap is the one stop solution for all woes that developers have been facing. It creates beautiful responsive designs without any extra efforts and without any advanced CSS knowledge. It is a true boon for every developer. We will be focusing on how to beautify our Rails applications through the help of Bootstrap. We will create a basic Todo application with Rails. We will explore the folder structure of a Rails application and analyze which folders are important for templating a Rails Application. This will be helpful if you want to quickly revisit Rails concepts. We will also see how to create views, link them, and also style them. The styling in this article will be done traditionally through the application's default CSS files. Finally, we will discuss how we can speed up the designing process using Bootstrap. In short, we will cover the following topics: Why Bootstrap with Rails? Setting up a Todo Application in Rails Analyzing folder structure of a Rails application Creating views Styling views using CSS Challenges in traditionally styling a Rails Application

Christmas Light Sequencer

In this article by Sai Yamanoor and Srihari Yamanoor , authors of the book Raspberry Pi Mechatronics Projects Hotshot , have picked a Christmas-themed project to demonstrate controlling appliances connected to a local network using Raspberry Pi. We will design automation and control of Christmas lights in our homes. We will decorate our homes with lights for any festive occasion and work on a article that enables us to build fantastic projects. We will build a local server to control the devices. We will use the framework to design the web server. We'd like to dedicate this article to the memory of Aaron Swartz who was the founder of the framework.

Agile data modeling with Neo4j

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