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Enhancing Your Blog with Advanced Features

In this article by Antonio Melé , the author of the Django by Example book shows how to use the Django forms, and ModelForms. You will let your users share posts by e-mail, and you will be able to extend your blog application with a comment system. You will also learn how to integrate third-party applications into your project, and build complex QuerySets to get useful information from your models. In this article, you will learn how to add tagging functionality using a third-party application.

Apache Camel: Transformation

This article by Scott Cranton and Jakub Korab , the authors of Apache Camel Developer's Cookbook , introduces various ways in which Camel allows us to transform or convert between and manipulate common message formats such as Java objects, XML, and JSON. The following ways are discussed in this article: Transforming using a Simple Expression Transforming inline with XQuery Transforming with XSLT Transforming from Java to XML with JAXB Transforming from Java to JSON Transforming from XML to JSON

Expert Python Programming: Interfaces

This article by, Michał Jaworski and Tarek Ziadé , the authors of the book, Expert Python Programming - Second Edition , will mainly focus on interfaces.

Learning JavaScript Data Structures: Arrays

In this article by Loiane Groner , author of the book Learning JavaScript Data Structures and Algorithms, Second Edition , we will learn about arrays. An array is the simplest memory data structure. For this reason, all programming languages have a built-in array datatype. JavaScript also supports arrays natively, even though its first version was released without array support. In this article, we will dive into the array data structure and its capabilities. An array stores values sequentially that are all of the same datatype. Although JavaScript allows us to create arrays with values from different datatypes, we will follow best practices and assume that we cannot do this(most languages do not have this capability). (For more resources related to this topic, see here .)

Cassandra High Availability: Replication

This article by Robbie Strickland , the author of Cassandra High Availability , describes the data replication architecture used in Cassandra. Replication is perhaps the most critical feature of a distributed data store, as it would otherwise be impossible to make any sort of availability guarantee in the face of a node failure. As you already know, Cassandra employs a sophisticated replication system that allows fine-grained control over replica placement and consistency guarantees. In this article, we'll explore Cassandra's replication mechanism in depth. Let's start with the basics: how Cassandra determines the number of replicas to be created and where to locate them in the cluster. We'll begin the discussion with a feature that you'll encounter the very first time you create a keyspace: the replication factor. (For more resources related to this topic, see here .)

Learning Embedded Linux Using Yocto: Virtualization

In this article by Alexandru Vaduva , author of the book Learning Embedded Linux Using the Yocto Project , you will be presented with information about various concepts that appeared in the Linux virtualization article. As some of you might know, this subject is quite vast and selecting only a few components to be explained is also a challenge. I hope my decision would please most of you interested in this area. The information available in this article might not fit everyone's need. For this purpose, I have attached multiple links for more detailed descriptions and documentation. As always, I encourage you to start reading and finding out more, if necessary. I am aware that I cannot put all the necessary information in only a few words. In any Linux environment today, Linux virtualization is not a new thing. It has been available for more than ten years and has advanced in a really quick and interesting manner. The question now does not revolve around virtualization as a solution for me, but more about what virtualization solutions to deploy and what to virtualize.

PrimeFaces Theme Development: Icons

In this article by Andy Bailey and Sudheer Jonna , the authors of the book, PrimeFaces Theme Development , we'll cover icons, which add a lot of value to an application based on the principle that a picture is worth a thousand words. Equally important is the fact that they can, when well designed, please the eye and serve as memory joggers for your user. We humans strongly associate symbols with actions. For example, a save button with a disc icon is more evocative. The association becomes even stronger when we use the same icon for the same action in menus and button bars. It is also possible to use icons in place of text labels. It is an important thing to keep in mind when designing the user interface of your application that the navigational and action elements (such as buttons) should not be so intrusive that the application becomes too cluttered with the things that can be done. The user wants to be able to see the information that they want to see and use input dialogs to add more. What they don't want is to be distracted with links, lots of link and button text, and glaring visuals. In this article, we will cover the following topics: The standard theme icon set Creating a set of icons of our own Adding new icons to a theme Using custom icons in a commandButton component Using custom icons in a menu component The FontAwesome icons as an alternative to the ThemeRoller icons

Mastering Splunk: Lookups

In this article, by James Miller , author of the book Mastering Splunk , we will discuss Splunk lookups and workflows. The topics that will be covered in this article are as follows: The value of a lookup Design lookups File lookups Script lookups

Supporting hypervisors by OpenNebula

OpenNebula is one of the most advanced and highly scalable open source cloud computing toolkits. If you ever wanted to understand what Cloud Computing is and how to realise it, this is your way. This article, by Giovanni Toraldo author of OpenNebula 3 Cloud Computing , guides you through the various hypervisors which are supported by OpenNebula. We will cover the following topics in this article: Configuring hosts Configuring sudo Configuring network bridges Managing hosts in OpenNebula Networking drivers KVM installation Xen installation Installing on Debian Squeeze through standard repositories Installing Xen through sources Installing VMware ESXi Installing Libvirt with ESX support  

Getting Started with Fortigate: Troubleshooting

In this article by Rosato Fabbri and Fabrizio Volpe , the authors of Getting Started with FortiGate , we will focus on diagnostic tools that are (for the most part) based on the CLI. We will start from a group of tools dedicated to hardware diagnostics, and then we will see a group of commands to identify errors related to layers 2 and 3 of the TCP/IP stack

R vs Pandas

This article focuses on comparing pandas with R, the statistical package on which much of pandas' functionality is modeled. It is intended as a guide for R users who wish to use pandas, and for users who wish to replicate functionality that they have seen in the R code in pandas. It focuses on some key features available to R users and shows how to achieve similar functionality in pandas by using some illustrative examples. This article assumes that you have the R statistical package installed. If not, it can be downloaded and installed from here: By the end of the article, data analysis users should have a good grasp of the data analysis capabilities of R as compared to pandas, enabling them to transition to or use pandas, should they need to. The various topics addressed in this article include the following: R data types and their pandas equivalents Slicing and selection Arithmetic operations on datatype columns Aggregation and GroupBy Matching Split-apply-combine Melting and reshaping Factors and categorical data

Getting Started with AWS and Amazon EC2

Amazon Web Services is an Infrastructure as a Service (IaaS) platform in the Cloud, which businesses can take advantage of as their needs demand. The Amazon Cloud provides the enterprise with the flexibility to choose whichever solution is required to solve specific problems, ultimately reducing costs by only paying for what you use. In this article by Rob Linton , author of Amazon Web Services: Migrate your .NET Enterprise Application to the Amazon Cloud: RAW , we show how to set up an AWS account and start an EC2 instance. We will also take a look at the creation of AMI images that we will use.

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