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Build a cloud-ready temperature sensor with the Arduino Uno and the IBM IoT Foundation, Part 1: Build the circuit and set up the environment
This tutorial (the first in a four-part series) introduces you to the Arduino microcontroller, discusses how the author has used it to solve a home-control issue, introduces some hardware add-ons to the Arduino and shows how to connect them up, and then shows how to load programs to test the hardware.
Tutorial 16 Sep 2014
From the developerWorks trenches: The best open technologies content in 2014
As developerWorks celebrates its 15th anniversary, the technical landscape has never been more exciting or complex. Myriad products, projects, technologies, and techniques abound. Let us cut through the noise and provide a quick look at what's hot right now.
Articles 16 Sep 2014
Mastering MEAN: MEAN and UGLI CRUD with responsive web design
Series author Scott Davis introduces the User Group List and Integration (UGLI) application: software to help manage user groups. Explore the basic create, retrieve, update, and delete (CRUD) functionality of the MEAN stack, and get introduced to the responsive web design capabilities of the Bootstrap framework.
Tutorial 16 Sep 2014
Build a cloud-ready temperature sensor with the Arduino Uno and the IBM IoT Foundation, Part 4: Deploy a query GUI
This is the final part of a four-part tutorial on building a temperature sensor with the Arduino Uno and the IBM Internet of Things (IoT) Foundation. In this part, you complete the end-to-end example by deploying a simple web page GUI for charting temperature and humidity data in nginx on IBM Bluemix, and see how to change the configuration of Node-RED to enable CORS.
Tutorial 16 Sep 2014
Build a cloud-ready temperature sensor with the Arduino Uno and the IBM IoT Foundation, Part 3: Build a custom application with Node-RED
This is the third part of a four-part tutorial on building a temperature sensor with the Arduino Uno and the IBM Internet of Things (IoT) Foundation. In this part, you register an organization and your device for the IBM IoT Foundation. You then use Node-RED to build a simple application that takes temperature and humidity data coming in via MQTT from the Arduino circuit and sketch built in Part 2 and stores it in a Mongo database. You also build a Node-RED flow to implement a web service that queries the database.
Tutorial 16 Sep 2014
Build a cloud-ready temperature sensor with the Arduino Uno and the IBM IoT Foundation, Part 2: Write the sketch and connect to the IBM IoT Foundation Quickstart
This tutorial (the second part of a four-part series) introduces MQTT (formerly Message Queueing Telemetry Transport), the protocol for the Internet of Things (IoT), and shows how you can implement MQTT on the Arduino. Learn about tools and techniques for testing and debugging problems with MQTT locally, and write an Arduino sketch that connects to the IBM Internet of Things Foundation Quickstart for graphing custom data.
Tutorial 16 Sep 2014
Mastering MEAN: Tour a MEAN application
In the first Mastering MEAN installment, you used a Yeoman generator to bootstrap a MEAN application. Now take a walking tour of the application, tracing the first incoming HTTP request from the server side (Node.js and Express) through to the client side (AngularJS).
Tutorial 11 Sep 2014
Mastering MEAN: Introducing the MEAN stack
Build a modern web application with MongoDB, Express, AngularJS, and Node.js in this six-part series by web development expert Scott Davis. This first installment includes a demo, sample code, and full instructions for creating a basic MEAN application. You'll also learn about Yeoman generators that you can use to bootstrap a new MEAN application quickly and easily.
Tutorial 09 Sep 2014
JVM concurrency: Asynchronous event handling in Scala
Scala Future and Promise classes give you powerful ways to handle asynchronous processing, including nonblocking ways to organize and sequence events. The async / await constructs, implemented as a macro, make it even easier to write nonblocking event handling in Scala. This tutorial shows you the basic Future and Promise techniques in action, then demonstrates how async / await can convert what looks like simple blocking code to nonblocking execution.
Tutorial 02 Sep 2014
Build an online learning platform with Open edX on SoftLayer
This article shows you how to quickly and easily install and set up an Open edX platform in a SoftLayer environment. It also shows you how to get started configuring the environment and prepare Open edX for use.
Also available in: Chinese   Japanese  
Articles 16 Jul 2014
Build a real-time polls application with Node.js, Express, AngularJS, and MongoDB
Build a polling application that updates in real-time as votes roll in. The app I created has a simple architecture that uses JavaScript for everything. Node.js and Express power the back-end, and MongoDB stores the app's data. At the front-end, AngularJS and Bootstrap power the user interface, with Web Sockets enabling the voting to update clients in real-time.
Also available in: Chinese   Japanese  
Articles 27 Jun 2014
Build a simple notification service with Node.js and MongoDB
Need to corral a large, disparate set of tools across development groups? Try using a notification service to create, signal, and subscribe to events. It's not hard. I'll walk you through it.
Also available in: Japanese  
Articles 27 Jun 2014
Use Software Defined Networking to optimize your IaaS
Explore Software Defined Networking (SDN) network management via software abstraction layers as a method to enhance and optimize your Infrastructure as a Service in the areas of interoperability, user and provider expectation management, developer and administrator requirements, and effective risk mitigation.
Also available in: Japanese  
Articles 24 Jun 2014
Explore the OpenStack REST APIs for PowerVC
IBM Power Virtualization Center Express Edition (PowerVC) is an IaaS cloud solution designed to make it easier to build and manage virtual resources in a Power Systems Software Defined Environment or a cloud infrastructure. It is primarily based on OpenStack and includes OpenStack industry-standard application programming interfaces. Learn about the APIs for each OpenStack component and the tasks they will help you complete.
Also available in: Japanese  
Articles 13 Jun 2014
Leverage Python, SciKit, and text classification for behavioral profiling
Learn how to build a behavioral profile model for customers based on text attributes of previously purchased product descriptions. With SciKit, a powerful Python-based machine learning package for model construction and evaluation, learn how to build and apply a model to simulated customer product purchase histories. In a sample scenario, construct a model that assigns music-listener profiles to individual customers, based on the specific products each customer purchases and the corresponding textual product descriptions.
Also available in: Russian   Japanese  
Articles 17 Apr 2014
Java.next: Concurrency in Clojure
Clojure has the most radical approach to concurrency of all the Java.next languages. This installment delves into some of the many facets of concurrency in Clojure, including the epochal time model and software transactional memory.
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Articles 15 Apr 2014
Improve web application security with Zend Framework 2
Web applications are vulnerable to attacks from different quarters, including SQL injection, XSS, CSRF, spam, and brute-force password hacking. But it's easy to protect your PHP web application from the majority of common attacks with the security-related components available in Zend Framework 2. This article illustrates how to use these components to make your application more secure by validating form input, filtering bot submissions, rejecting comment spam, and logging unusual events.
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Articles 04 Mar 2014
3D development with WebGL, Part 2: Code less, do more with WebGL libraries
The WebGL API gives JavaScript developers the ability to tap directly into the powerful built-in 3D graphics acceleration capabilities of today's PC and mobile-device hardware. Supported transparently in modern browsers, WebGL makes it possible to create high-performance 3D games, applications, and 3D-enhanced UIs for mainstream web users. This article is the second a three-part series for JavaScript developers who are new to WebGL. Series author Sing Li introduces you to two WebGL libraries that make 3D development far more efficient than coding directly to the WebGL API.
Also available in: Japanese  
Articles 21 Jan 2014
IBM Entrepreneur Week
IBM Entrepreneur Week is a one-of-a-kind opportunity for you to meet, interact, and connect with entrepreneurs, venture capitalists, industry leaders, and academics from around the world. If you're a startup or entrepreneur, join us onlne for our inaugural IBM Entrepreneur Week, 3-7 Feb 2014. There will be events taking place online and in locations worldwide, including face-to-face and virtual mentoring sessions, a women entrepreneur-focused event, and a LiveStream broadcast of the SmartCamp Global Finals in San Francisco.
Articles 15 Jan 2014
Create Linux and Windows images for OpenStack private clouds
This article proposes a new way to construct Linux and Windows images for private clouds built with the OpenStack cloud operating system. Current image-creation methods for OpenStack environments are cumbersome and time-consuming. The authors present an online, self-service method that makes image construction faster and easier for operators and end users of private clouds.
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Articles 13 Jan 2014
Extract information from the web with Ruby
Explore the latest methods for extracting structured information from the web. Using Ruby script examples, author M. Tim Jones demonstrates scraping technology and the use of web APIs for targeted data retrieval.
Also available in: Russian   Japanese  
Articles 17 Dec 2013
Create a mobile-friendly to-do list app with PHP, jQuery Mobile, and Google Tasks
Want a build a simple mobile app to create and manage your to-do lists? It's easy with the Slim PHP micro-framework, jQuery Mobile, and the Google Tasks API. I'll show you how I did it.
Also available in: Chinese   Japanese  
Articles 13 Dec 2013
Discover OpenStack: The Storage components Swift and Cinder
This article presents OpenStack Block (Swift) and Object (Glance) storage, explains how they fit into the overall architecture, and shows how they operate. It illustrates the tools with insight into what it takes to install, configure, and use the components.
Also available in: Chinese   Japanese  
Articles 12 Dec 2013
Recommender systems, Part 2: Introducing open source engines
Part 1 of this series introduces the basic approaches and algorithms for the construction of recommendation engines. This concluding installment explores some open source solutions for building recommendation systems and demonstrates the use of two of them. The author also shows how to develop a simple clustering application in Ruby and apply it to sample data.
Also available in: Russian   Japanese  
Articles 12 Dec 2013
Recommender systems, Part 1: Introduction to approaches and algorithms
Most large-scale commercial and social websites recommend options, such as products or people to connect with, to users. Recommendation engines sort through massive amounts of data to identify potential user preferences. This article, the first in a two-part series, explains the ideas behind recommendation systems and introduces you to the algorithms that power them. In Part 2, learn about some open source recommendation engines you can put to work.
Also available in: Russian   Japanese  
Articles 12 Dec 2013
VizJSON: The grammar of graphics in JSON
This article outlines the benefits of an industry-wide notation to express the rules for representing visualizations. It highlights one particular notation called VizJSON, which is based on Leland Wilkinson's The Grammar of Graphics approach for visualization.
Articles 03 Dec 2013
Discover OpenStack: Architectures, functions, and interactions
OpenStack is a popular open source cloud computing project promoted by IBM and other industry leaders. This overview presents the overall architecture, the function of the individual modules, and their interactions. Other articles in the series will detail various OpenStack components.
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Articles 02 Dec 2013
Oozie workflow scheduler for Hadoop
Big data in its raw form rarely satisfies the Hadoop developer's data requirements for performing data processing tasks. Different extract/transform/load (ETL) and pre-processing operations are usually needed before starting any actual processing jobs. Oozie is a framework that helps automate this process and codify this work into repeatable units or workflows that can be reused over time without the need to write any new code or steps. Learn how Oozie can be used to create different types of workflows.
Also available in: Russian   Japanese  
Articles 19 Nov 2013
Simplifying scalable cloud software development with Apache Thrift
Apache Thrift is a framework that enables scalable cross-language development, resulting in unambiguous communication among components in cloud environments. This article introduces the ideas around Thrift (an interface definition for remote procedure call with multilanguage bindings), and then demonstrates Thrift in a multilanguage client and server application.
Also available in: Russian   Japanese   Portuguese  
Articles 12 Nov 2013
Sentry 2 and PHP, Part 2: Authentication and access control for PHP
Authentication and access control are critical to keep your web application secure. Sentry 2 is a framework-agnostic authentication and authorization system written in PHP. It provides built-in methods for many common authentication and authorization tasks, allowing you to efficiently and securely develop public-facing PHP web applications.
Articles 12 Nov 2013
Meet Eclipse Orion: For the cloud, in the cloud
The Eclipse Orion project's objective is to create a browser-based, open source, tool-integration platform, one entirely focused on developing for the web, in the web. Orion tools are written in JavaScript, they run in the browser, and its components are individually consumable. This article introduces you to Orion, and provides resources and commentary to help familiarize you with the tools.
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Articles 01 Nov 2013
Next-generation search and analytics with Apache Lucene and Solr 4
Apache Lucene and Solr are highly capable open source search technologies that make it easy for organizations to enhance data access dramatically. With the 4.x line of Lucene and Solr, it's easier than ever to add scalable search capabilities to your data-driven applications. Lucene and Solr committer Grant Ingersoll walks you through the latest Lucene and Solr features that relate to relevance, distributed search, and faceting. Learn how to leverage these capabilities to build fast, efficient, and scalable next-generation data-driven applications.
Also available in: Chinese   Japanese  
Articles 28 Oct 2013
Recover from a failed Linux boot
If your Linux computer fails to boot after a kernel upgrade, disk swap, or other system change, you're not helpless. The Grand Unified Bootloader (GRUB) gives you ways to control the boot process and recover. Or, if necessary, emergency boot disks that you create with an external tool can come to the rescue. Learn procedures and GRUB commands that can help you boot in problem situations, and find out about a life-saving external tool for BIOS-based systems.
Also available in: Chinese   Japanese  
Articles 22 Oct 2013
IBM@JavaOne 2013: The IBM sessions
IBM is a regular supporter of the JavaOne conference, both as a sponsor and as a source of technical presenters. If you plan to attend JavaOne 2013, don't miss your opportunity to glean invaluable knowledge from IBM's Java experts and to learn about their vital contributions to the Java ecosystem. This article gives you an overview of the activities that the IBM team is involved in during the week of JavaOne in 2013.
Also available in: Chinese  
Articles 19 Sep 2013
Java.next: Extension without inheritance, Part 3
The Java.next languages Groovy, Scala, and Clojure remedy the Java language's extension limitations in numerous ways. This Java.next installment covers the astounding extension capabilities that are available through Groovy's metaprogramming facilities.
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Articles 03 Sep 2013
Do I need to learn R?
R is a flexible programming language designed to facilitate exploratory data analysis, classical statistical tests, and high-level graphics. With its rich and ever-expanding library of packages, R is on the leading edge of development in statistics, data analytics, and data mining. R has proven itself a useful tool within the growing field of big data and has been integrated into several commercial packages, such as IBM SPSS and InfoSphere, as well as Mathematica. This article offers a statistician's perspective on the value of R.
Also available in: Chinese   Russian  
Articles 03 Sep 2013
Mobile for the masses: Sign, seal, and deliver your Android app
By web logic, content is king; but for mobile users, interaction rules. Static information design is out for mobile apps, and gamification is in. This month Andrew Glover concludes his introduction to Android mobile development by adding a multiple-choice quiz feature to the example app, Overheard Word, introduced in a previous article. Then he shows you how to generate a digital signature and publish and promote your signed app on Google Play or Amazon Appstore for Android.
Also available in: Japanese  
Articles 03 Sep 2013
Build server-cluster-aware Java applications
Server clustering has become commonplace for highly scalable Java enterprise application development, but application-level server-cluster awareness is not currently part of Java EE. In this article, Mukul Gupta and Paresh Paladiya show you how to leverage two open source projects, Apache ZooKeeper and LinkedIn's Project Norbert, for server-group coordination in distributed enterprise Java applications.
Also available in: Chinese   Japanese   Spanish  
Articles 27 Aug 2013
Develop Spring Redis applications
Redis is a key-value NoSQL datastore solution. Spring Data Redis is a Spring portfolio project that helps Java developers build Spring applications with Redis, without needing to work directly with the low-level Redis API. This article introduces Redis and then shows how to build a simple dictionary application by using the Spring Data Redis API.
Also available in: Japanese  
Articles 21 Aug 2013
Create LaTeX documents graphically with LyX
LyX is a graphical tool, with a familiar drop-down and content-driven menu system, for writing and editing LaTeX documents. TeX and its higher-level macro language, LaTeX, are powerful document markup languages that are the de facto standard for Linux users. New users can find them difficult to work with because you must know the available markup tags, the contexts they can be used in, and how to use a text editor and previewing tool. LyX simplifies the entire process of working with LaTeX documents not just on Linux. Learn how to install, use, and customize LyX on Linux, UNIX, Windows, and Mac OS X systems.
Also available in: Chinese   Japanese  
Articles 16 Aug 2013
Deploying and managing scalable web services with Flume
Machine-generated log data is valuable in locating causes of various hardware and software failures. The information derived from it can provide feedback in improving system architecture, reducing system degradation, and improving up-time. Recently, businesses have started using this log data for deriving business insight. Using a fault-tolerant architecture, Flume is a distributed, service for efficiently collecting, aggregating, and moving large amounts of log data. In this article, we will learn how to deploy and use Flume with a Hadoop cluster and a simple distributed web service.
Also available in: Russian  
Articles 13 Aug 2013
Data science and open source
Data science combines mathematics and computer science for the purpose of extracting value from data. This article introduces data science and surveys prominent open source tools in this rapidly growing field.
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Articles 09 Aug 2013
Agile DevOps: Build a DevOps dashboard
What if you could get instant feedback on the health of your software system with every change applied -- not only to the software application, but also to the database, infrastructure, and configuration? In this final Agile DevOps installment, DevOps expert Paul Duvall helps you set up a DevOps dashboard by using the open source CanaryBoard tool. The dashboard reveals the state of the entire software system under development -- from check-in to production -- at a glance.
Also available in: Russian   Portuguese  
Articles 08 Aug 2013
Automated testing with Selenium and Cucumber
Take the pain out of test automation with Selenium and Cucumber, by learning to write tests in simple feature files and drive them through your browser with the flip of a switch. This article is a hands-on introduction to setting up a test automation framework with Selenium and Cucumber, creating a test suite for single-page web applications, and running tests across multiple web and mobile browsers via Selenium Grid.
Also available in: Russian   Japanese  
Articles 06 Aug 2013
Rapid web development with Bootstrap
Learn how to use Bootstrap to kickstart websites and web applications, including mobile-friendly ones. Bootstrap, which is based on the LESS project, was developed by Twitter's internal engineers to provide a consistent framework for web application UIs.
Also available in: Chinese   Russian   Japanese  
Articles 06 Aug 2013
Java.next: Extension without inheritance, Part 2
The Java language suffers from intentional limitations in its extension mechanisms, relying primarily on inheritance and interfaces. Groovy, Scala, and Clojure offer many more extension alternatives. This installment further explores Clojure's use of protocols as an extension mechanism.
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Articles 30 Jul 2013
Do more in CSS with LESS
Learn how to use LESS to write readable and maintainable Cascading Style Sheets (CSS) for modern websites. CSS makes the terrible old days of layout tricks with tables and invisible images a dim memory. But CSS is still unfriendly, and several initiatives tried to tame it for developers. One of the best is LESS, which extends CSS with dynamic behavior such as variables, mixins, operations, and functions. LESS is a CSS-like language that compiles seamlessly into CSS either on the client side or through server-side preprocessing.
Also available in: Chinese   Russian   Japanese  
Articles 18 Jul 2013
Improve CSS development with Sass
Syntactically awesome stylesheets (Sass) is a meta-language and cascading stylesheets (CSS) preprocessor. Understanding Sass principles is your key to faster, more efficient CSS development. Sass provides simple, elegant, and robust syntax for CSS so you can create manageable stylesheets. Learn the basics of using Sass to improve the stylesheets for your website in this introduction.
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Articles 18 Jul 2013
Data visualization, Part 1: Visualize browsing metrics with SVG and D3
In this two-article series, learn how to use Scalable Vector Graphics (SVG) with the open source D3 JavaScript library to create data visualizations. Shapes, colors, and layouts can be of great help in making business sense out of data volumes. An example scenario demonstrates the use of SVG and D3 for creating informative graphics out of browsing metrics for social media.
Also available in: Chinese   Russian   Japanese  
Articles 15 Jul 2013
Data visualization, Part 2: Use D3 component layouts
In this two-article series, learn how to use Scalable Vector Graphics (SVG) with the open source D3 JavaScript library to create data visualizations. Shapes, colors, and layouts can be of great help in making business sense out of data volumes. This article demonstrates various ways to arrange graphical components to represent your data on a canvas, using both D3's and your own calculations.
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Articles 15 Jul 2013
DB2 JSON capabilities, Part 3: Writing applications with the Java API
DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or IBM DB2 for z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of a RDBMS with well-known enterprise features and quality of service. This DB2 NoSQL capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. The DB2 JSON Java API is the backbone of the command-line processor and the wire listener, and supports writing custom applications. The article introduces basic methods with a sample Java program and discusses options to optimize storing and querying JSON documents.
Also available in: Chinese   Japanese  
Articles 03 Jul 2013
DB2 JSON capabilities, Part 4: Using the IBM NoSQL Wire Listener for DB2
DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or IBM DB2 on z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of a RDBMS with well-known enterprise features and quality of service. This DB2 NoSQL capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. In this article, the IBM NoSQL Wire Listener for DB2 is introduced. It parses messages based on the MongoDB wire protocol. It thus enables using MongoDB community drivers, and the skills acquired when working with these drivers, to store, update and query JSON documents with DB2 as JSON store.
Also available in: Chinese   Japanese  
Articles 27 Jun 2013
Use Doctrine with the Zend Framework
Doctrine is an object-relational mapping (ORM) tool for PHP application development. With a modicum of configuration, you can combine it with the Zend Framework so that you can use Doctrine entities to simplify interaction with application data. This article shows you the process for integrating Doctrine 2.3 with a Zend Framework 1.x or 2.x application.
Also available in: Japanese  
Articles 25 Jun 2013
DB2 JSON capabilities, Part 1: Introduction to DB2 JSON
DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or in IBM DB2 for z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of an RDBMS, which provides established enterprise features and quality of service. This DB2 JSON capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. In this article, get an introduction to the DB2 JSON technology.
Also available in: Chinese   Japanese  
Articles 20 Jun 2013
DB2 JSON capabilities, Part 2: Using the command-line processor
Rapidly changing application environments require a flexible mechanism to store and communicate data between different application tiers. JSON (Java Script Object Notation) has proven to be a key technology for mobile, interactive applications by reducing overhead for schema designs and eliminating the need for data transformations. DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or IBM DB2 for z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of a RDBMS, which provides established enterprise features and quality of service. This DB2 NoSQL capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. In this article, you will set up a DB2 database to support NoSQL applications and walk through a scenario that introduces basic features of the DB2 JSON command-line processor to help you get started with your own applications.
Also available in: Chinese   Japanese  
Articles 20 Jun 2013
Instant web applications with Meteor
With Meteor, a new web application-creation platform, JavaScript developers can build highly interactive and responsive rich-client web applications simply and rapidly. Meteor proposes a new way to think about web application design and development, with the aim of simplifying and dramatically shortening the development cycle. Sing Li goes beyond the hype and explores the promise of Meteor with two functional, nontrivial application examples -- one web-based and one mobile -- and coverage of the Meteor architecture. You'll gain hands-on experience building Meteor applications while leveraging popular-industry standard JavaScript libraries.
Also available in: Chinese   Russian   Japanese  
Articles 14 Jun 2013
Java.next: Extension without inheritance, Part 1
Groovy, Scala, and Clojure offer many extension mechanisms, whereas inheritance is virtually the Java language's only option. This installment looks at category classes, the ExpandoMetaClass, implicit casts, and protocols as ways to extend Java classes with the Java.next languages.
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Articles 12 Jun 2013
Processing large-scale graph data: A guide to current technology
With emphasis on Apache Giraph and the GraphLab framework, this article introduces and compares open source solutions for processing large volumes of graph data. The growth of graph-structured data in modern applications such as social networks and knowledge bases creates a crucial need for scalable platforms and parallel architectures that can process it in bulk. Despite its prominent role in big data analytics, MapReduce is not the optimal programming model for graph processing. This article explains why and then explores systems in development to tackle the graph-processing challenge.
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Articles 10 Jun 2013
Automate and manage systems installation with Cobbler
Cobbler simplifies system provisioning by centralizing the tasks that are involved in setting up and administering an installation server. This article discusses some of Cobbler's features, how to install it, and how to create a configuration suitable for automatically installing multiple client machines.
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Articles 07 Jun 2013
Maqetta means mockup, Part 3: Deploy your Maqetta UI prototype with PhoneGap
So far in this series introducing Maqetta, you've learned how to create and enrich an interactive mobile UI prototype using features from the Dojo and Dojo Mobile toolkits. Working in your browser with Maqetta, you were able to build a believable prototype without writing any code, then augment its features and flow with custom JavaScript. Now it's time to combine Maqetta with PhoneGap in order to create and deploy a new mobile UI prototype onto actual devices.
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Articles 06 Jun 2013
Prototype web applications with CouchDB and Bootstrap
Combine Apache CouchDB with Twitter's Bootstrap to kickstart web application development in a way that cleanly separates the presentation and database layers. CouchDB is well-known as a relaxing way to develop databases, especially for websites. On the front end, more open source toolkits are emerging for prototyping sites, and even for full deployment. Among them, the Bootstrap framework is especially useful for working up web UIs. Learn how to build on Bootstrap while you use CouchDB for persistence.
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Articles 04 Jun 2013
Mobile for the masses: Activities and icons in your Android application lifecycle
The Activity class is the workhorse of an Android mobile app, and it's also where you can fine-tune your app's interactions with both the user and the mobile device. Get things working exactly the way you want them in your app's lifecycle, then use icons and action bars to guide users through UI navigation and other app features.
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Articles 28 May 2013
The right way to read files with PHP
Learn how to use the different file functions of PHP. Review basic file functions, such as fopen, fclose, and feof, learn reading functions, such as fgets, fgetss, and fscanf. And discover functions that process entire files in one or two lines of code.
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Articles 17 May 2013
Java.next: Common ground in Groovy, Scala, and Clojure, Part 3
The last of three installments about commonalities among Clojure, Scala, and Groovy investigates how these languages handle exceptions, expressions, and null -- all problem areas for the Java language. Each of the Java.next languages addresses the shortcomings of the Java language through a unique implementation that highlights that language's characteristics.
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Articles 14 May 2013
Java.next: Common ground in Groovy, Scala, and Clojure, Part 1
The Java.next languages (Groovy, Scala, and Clojure) have more commonalities than differences, converging toward common ground in many of their features and conveniences. This installment explores how they each address a longstanding deficiency in the Java language -- the inability to overload operators. It also discusses the related concepts of associativity and precedence.
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Articles 14 May 2013
Java.next: The Java.next languages
This article launches a new developerWorks series by Neal Ford that performs a deep comparison of three next-generation JVM languages: Groovy, Scala, and Clojure. In this initial installment, find out what you'll gain from understanding their similarities and differences -- whether or not you choose to keep using Java as your main programming language for now.
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Articles 14 May 2013
Java.next: Common ground in Groovy, Scala, and Clojure, Part 2
Common complaints about the Java language concern excessive ceremony for simple tasks and defaults that are sometimes confusing. All three of the Java.next languages take more sensible approaches in those areas. This installment of Java.next shows how Groovy, Scala, and Clojure smooth out the Java language's rough edges.
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Articles 14 May 2013
Introducing MicroXML, Part 2: Process MicroXML with microxml-js
MicroXML is a simplification of XML that is compatible with earlier versions. Part 1 of this two-article series covers the basic principles of MicroXML. MicroXML is designed with a straightforward grammar that can be processed with many modern general-purpose parsing tools. James Clark, who led the original push for MicroXML, is among those thinkers who developed a parser for the community specification. Learn how to use Clark's JavaScript MicroXML parser to experiment with the format.
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Articles 07 May 2013
Introducing MicroXML, Part 1: Explore the basic principles of MicroXML
Parts of the XML community always grumble that XML is difficult to understand and process. XML is fundamentally complex for various historical reasons, and people proposed simplified versions for more than a decade. JSON and HTML5 threaten some of the most basic XML tenets. MicroXML -- a simplification of XML that is compatible with earlier versions -- emerged from discussions of these issues. MicroXML is now under the guidance of a W3C community group, and several basic implementations are already available for the draft specification. In this first article of a two-part series, learn from one of the MicroXML Community Group co-chairs about MicroXML and its technical differences from the XML 1.x core standards.
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Articles 07 May 2013
Creating a Drupal multisite installation
One important feature of the Drupal content management system is that it enables you to run multiple websites from a single base installation of the framework -- a feature called multisite installations. Such installations are particularly useful to web administrators who have to manage and maintain several sites on a long-term basis, and the functionality simplifies the administration of multiple Drupal installations located on the same server by making all of them run from a single script. In this article, see how to install, configure, run, and administer multisite Drupal.
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Articles 30 Apr 2013
Get started with GeoServer and its REST API
GeoServer is an open source server for managing geographic information system (GIS) data sources and serving them easily through Web Feature Service (WFS) and Web Map Service (WMS) web services. It includes a comprehensive Representational State Transfer (REST) API for managing data at run time from complex web applications without manual intervention, and it works well in tandem with the OpenLayers mapping tool. This article introduces and explores GeoServer, including the benefits of creating a PHP wrapper class for the API.
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Articles 30 Apr 2013
Weaving data visualizations with the Weave platform
Weave is a new platform for the visualization of trend and geographical data, developed at the University of Massachusetts Lowell. Weave supports a wide range of uses and is intended for both novice and advanced users. Explore the use of Weave for visualizing data from publicly available repositories with the hands-on examples in this article.
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Articles 23 Apr 2013
Accelerating web applications with OpenCL
The Web Computing Language (WebCL) enables web applications to execute functions on the host's graphics processor, dramatically accelerating many types of data-processing routines, such as data sorting, text searching, and solving systems of matrices. Learn how WebCL's JavaScript classes enable high-speed number-crunching by delivering computing tasks to graphics processors.
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Articles 23 Apr 2013
Mobile for the masses: Take a swipe at it! Programming gestures in Android
Mobile users are typically distracted, busy, and ergonomically constrained, so build your mobile application UIs accordingly. Andrew Glover discusses key factors that differentiate mobile apps from web apps, then guides you through the creation of a mobile application UI that uses swipe gestures for navigation rather than button clicks.
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Articles 23 Apr 2013
Open source desktop publishing with Scribus
Scribus is an open source, graphical desktop publishing (DTP) tool that focuses on layout, frames, styles, color management, and intercolumn document flow. Scribus is free software that runs on the Linux, Windows, and Mac OS X platforms, and provides most of the capabilities of traditional DTP tools at no cost.
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Articles 16 Apr 2013
Create your own browser extensions, Part 4: Move toward browser-agnostic extensions
Every browser has its fans, detractors, advantages, and disadvantages. One thing they all have in common is that people increasingly spend more time using them. This series examines how to build the same basic extension for Chrome, Firefox, and Safari. You'll learn what it is like to extend each browser, how hard or easy it is to perform some common tasks, and how to distribute your extension. In this final article of this series, you'll create a common extension that all three browsers can share.
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Articles 05 Apr 2013
Create your own browser extensions, Part 3: Extend your reach into Safari
Every browser has its fans, detractors, advantages, and disadvantages. One thing they all have in common is that people increasingly spend more time using them. This series examines how to build the same basic extension for Chrome, Firefox, and Safari. You'll learn what it is like to extend each browser, how hard or easy it is to perform some common tasks, and how to distribute your extension. In this article, you'll build an extension for Safari.
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Articles 05 Apr 2013
Create your own browser extensions, Part 2: Extend your reach into Firefox
Every browser has its fans, detractors, advantages, and disadvantages. One thing they all have in common is that people increasingly spend more time in them. This series examines how to build the same basic extension for Chrome, Firefox, and Safari. You'll learn what it is like to extend each browser, how hard or easy it is to perform some common tasks, and how to distribute your extension. In this article, you'll build an extension for Firefox.
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Articles 05 Apr 2013
Create your own browser extensions, Part 1: Extend your reach into Chrome
Every browser has its fans, detractors, advantages, and disadvantages. One thing they all have in common is that people increasingly spend more time using them. This series examines how to build the same basic extension for Chrome, Firefox, and Safari. You'll learn what it is like to extend each browser, how hard or easy it is to perform some common tasks, and how to distribute your extension In this article, you build an extension for Chrome.
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Articles 05 Apr 2013
Introduction to linked data and OSLC
Learn the concepts of linked lifecycle data and its application in this introduction to Open Services for Lifecycle Collaboration (OSLC).
Demos 04 Apr 2013
Process real-time big data with Twitter Storm
Storm is an open source, big-data processing system that differs from other systems in that it's intended for distributed real-time processing and is language independent. Learn about Twitter Storm, its architecture, and the spectrum of batch and stream processing solutions.
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Articles 02 Apr 2013
Build a text visualization and analytics application
Text visualization is an effective way to see and analyze what a designated text is saying. Learn to combine Eclipse and open source text visualization and analytics tools to build a word-wave application that visualizes and compares two texts.
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Articles 02 Apr 2013
Supply cloud-level data scalability with NoSQL databases
This article explores NoSQL databases, including an overview of the capabilities and features of NoSQL systems HBase, MongoDB, SimpleDB. It also covers cloud and NoSQL database design basics.
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Articles 25 Mar 2013
Maqetta means mockup, Part 2: Write custom JavaScript for your Maqetta mobile UI
As you learned in Part 1 of this series, Maqetta is a WYSIWYG application that makes it easy to design a sophisticated desktop or mobile UI without writing any code. But what if you need a richer UI that responds to user input in more advanced ways? In this follow-up article, Tony Erwin walks you through the process of enhancing your Maqetta mobile UI with custom JavaScript using Dojo and the Dojo Mobile library.
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Articles 11 Mar 2013
Mobile for the masses: A gentle introduction to Android
The mobile landscape is rich with promise, and Android is a viable and exciting platform for developers who seek a way in. This new series starts with an introduction to Android that is tailored specifically for Java developers just getting started with mobile. Learn about Android's three-layer versioning system (and find out why it matters), then set up your development environment and build your first Android app.
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Articles 05 Mar 2013
IBM i Live Partition Mobility in a multichassis IBM PureFlex System environment
This article explains the main steps to configure Live Partition Mobility (LPM) for IBM i in an IBM® PureFlex™ System multichassis environment. Running LPM is also documented, according to a video caption taken during the IBM Flex System Manager™ GA3 release testing
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Articles 28 Feb 2013
Test automation and continuous integration with STAF/STAX
Regression and incremental tests play an important role during the testing of an application that might comprise hundreds or thousands of requirements. While the execution of incremental tests can sometimes be run manually, regression tests require an automation tool or framework. The support for multiple operating systems, architectures, and middleware software, like application servers and databases, make the necessity of an automation framework even more urgent. This article briefly introduces STAF/STAX test automation framework. It also shows how you can use it to build a framework for the automation of tests and continuous integration in a complex test bed.
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Articles 26 Feb 2013
Data science in the cloud
Data Science is a growing specialization that can touch on many of the following topics: Cloud computing, big data, math, business theory, and computer science theory. A scripting language like Python is often a great choice for the typical cycle of prototyping to make sure the math of the problem works, then "productizing" the result to a distributed farm of cloud servers. This article presents some hands-on examples of investment analysis and statistical analysis using IPython and pandas.
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Articles 21 Feb 2013
Tour the Folsom release of OpenStack
The OpenStack Folsom release debuted in September 2012 and includes exciting new features, such as the introduction of a "core" version of Quantum (networking as a service) and Cinder (block storage), making a block storage as a service offering. Folsom also provides better Open vSwitch integration, which is an advanced network manager for Linux. In this article, install and discover the Folsom release's new features in a fully virtualized approach using KVM.
Articles 20 Feb 2013
Linear optimization in Python, Part 2: Build a scalable architecture in the cloud
Creating scalable and parallelizable code in a scripting language like Python requires careful thought. This series explores ways to model optimization applications in Python using Pyomo, an open source tool that can be used to define symbolic problems, create concrete problem instances, and solve these instances with standard solvers. Part 1 covers the basics of modeling optimization applications using Pyomo and Python. This article shows how to scale a Python linear optimization horizontally by combining Pyomo with the Tornado web server, and using RabbitHQ as the message bus between the layers.
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Articles 20 Feb 2013
Agile DevOps: Breaking down silos
Effective use of tools is vital for teams that embrace DevOps, but breaking down the traditional organizational silos of old-world software development is the critical driver for maximum efficiency and innovation. In this installment of Agile DevOps, Paul Duvall covers how to move an organization toward using cross-functional teams that collaborate, instead of silos that stifle communication.
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Articles 12 Feb 2013
Data mining in a document world
Predictive analytics, business intelligence, and data mining in general all require the storage and processing of complex and often wildly different data structures as the information is processed, resolved, and summarized. It is highly likely, particularly for business and financial information, that a significant amount of that data comes from relational databases. These follow a strict structure and require a significant amount of preparation in terms of designing your schema and data model beforehand. The new breed of NoSQL and document-based databases make much of this processing simpler because you can create and dump information in a flexible format. Additionally, you can work on methods to extract that data in the fixed format you require. In this article, I look at how to use document-based databases for data processing and analytics as part of your overall database solution.
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Articles 12 Feb 2013
Linear optimization in Python, Part 1: Solve complex problems in the cloud with Pyomo
Explore ways to model optimization applications in Python using Python Optimization Modeling Objects (Pyomo), an open source tool. You can use Pyomo to define symbolic problems, create concrete problem instances, and solve these instances with standard solvers. This article series shows how to leverage Pyomo's ability to integrate with Python to model optimization applications. This first article covers the basics. Part 2 shows how to add more tools and build a scalable architecture.
Also available in: Chinese  
Articles 05 Feb 2013
Build rapid and lightweight static websites with Hyde
Web publishing frameworks are great, but sometimes they're just too much and you want a simple, static site that you can rely on for good and consistent performance. Static site generators are a useful hybrid for those occasions when you want the convenience of a web publishing framework without the overhead. Hyde is a popular site generator that provides powerful templating, based on Django, and metadata management. It's implemented in Python but does not strictly require Python knowledge. In this article, learn to use Hyde to accelerate development of static websites.
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Articles 05 Feb 2013
Working with XML on Android
Android is a modern, open source operating system and SDK for mobile devices. With it you can create powerful mobile applications. This becomes even more attractive when your applications can access Web services, which means you need to speak the language of the Web: XML. In this article, you will see different options for working with XML on Android and how to use them to build your own Android applications.
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Articles 01 Feb 2013
Integrating PHP applications with Instagram, Part 1
Instagram is a popular photo-sharing service that enables users to take photos with their smartphone and share them with others through the Web. Application developers can search and retrieve these photos, together with their associated comments and likes, through the Instagram REST API. This two-part article introduces the Instagram API and illustrates how it can be used with PHP to leverage Instagram's rich repository of user-generated content and create innovative web applications.
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Articles 01 Feb 2013
Integrating PHP applications with Instagram, Part 2
Instagram is a popular photo-sharing service that enables users to take photos with their smartphone and share them with others through the Web. Application developers can search for and retrieve these photos, together with their associated comments and likes, through the Instagram REST API. This two-part article introduces the Instagram API and illustrates how it can be used with PHP to leverage Instagram's rich repository of user-generated content and to create innovative web applications.
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Articles 01 Feb 2013
Agile DevOps: Continuous software delivery in the cloud
When developers and operations work together in a collaborative manner, they often need one place to manage the software delivery process and pipeline of changes. A Continuous Delivery (CD) platform addresses this need. In this Agile DevOps installment, DevOps expert Paul Duvall lays out how you can use OpenDelivery, an open CD platform.
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Articles 08 Jan 2013
Develop easy real-time websites with Meteor
Because of the ubiquity of the web, even small delays in the delivery of data can be an irritant to users. They want data to update immediately. Unfortunately, web technology has not quite caught up to this demand for real-time access. While data access is being rapidly standardized into several classes of Object-Relational Mapping (ORM), real-time communication has no such solution. This article discusses Meteor, an exciting new JavaScript framework that aims to solve this problem.
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Articles 08 Jan 2013
Maqetta means mockup, Part 1: Design an HTML5 mobile UI
Need to prototype an HTML5 app? Forget coding. Hand-eye coordination is just about all you need to prototype with Maqetta, a browser-based WYSIWYG tool for desktop and mobile applications. This first article in a three-part series introduces this free, open source project that runs in a browser and lets designers drag and drop a rich set of widgets to build live UI mockups. In Part 1, get to know Maqetta's major functions and features while prototyping a realistic mobile application.
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Articles 04 Jan 2013

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