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Advanced Playbooks

In this article by the author, Daniel Hall , of the book, Ansible Configuration Management - Second Edition , we learn to start digging a bit deeper into playbooks. We will be covering the following topics: External data lookups Storing results Processing data Debugging playboks

Profiling an app

This article is written by Cecil Costa , the author of the book,  Swift Cookbook . We'll delve into what profiling is and how we can profile an app by following some simple steps. It's very common to hear about issues, but if an app doesn't have any important issue, it doesn't mean that it is working fine. Imagine that you have a program that has a memory leak, presumably you won't find any problem using it for 10 minutes. However, a user may find it after using it for a few days. Don't think that this sort of thing is impossible; remember that iOS apps don't terminate, so if you do have memory leaks, it will be kept until your app blows up. Performance is another important, common topic. What if your app looks okay, but it gets slower with the passing of time? We, therefore, have to be aware of this problem. This kind of test is called profiling and Xcode comes with a very good tool for realizing this operation, which is called Instruments . In this instance, we will profile our app to visualize the amount of energy wasted by our app and, of course, let's try to reduce it.

Recording Your First Test

JMeter comes with a built-in test script recorder, also referred to as a proxy server ( ), to aid you in recording test plans. The test script recorder, once configured, watches your actions as you perform operations on a website, creates test sample objects for them, and eventually stores them in your test plan, which is a JMX file. In addition, JMeter gives you the option to create test plans manually, but this is mostly impractical for recording nontrivial testing scenarios. You will save a whole lot of time using the proxy recorder, as you will be seeing in a bit. So without further ado, in this article by Bayo Erinle , author of Performance Testing with JMeter - Second Edition , let's record our first test! For this, we will record the browsing of JMeter's own official website as a user will normally do. For the proxy server to be able to watch your actions, it will need to be configured. This entails two steps: Setting up the HTTP(S) Test Script Recorder within JMeter. Setting the browser to use the proxy.

Project Management

In this article by Patrick Li , author of the book JIRA Essentials - Third Edition , we will start with a high-level view of the overall hierarchy on how data is structured in JIRA. We will then take a look at the various user interfaces that JIRA has for working with projects, both as an administrator and an everyday user. We will also introduce permissions for the first time in the context of projects and will expand on this. In this article, you will learn the following: How JIRA structures content Different user interfaces for project management in JIRA How to create new projects in JIRA How to import data from other systems into JIRA How to manage and configure a project How to manage components and versions

Solr Indexing Internals

In this article by Jayant Kumar , author of the book  Apache Solr Search Patterns , we will discuss use cases for Solr in e-commerce and job sites. We will look at the problems faced while providing search in an e-commerce or job site: The e-commerce problem statement The job site problem statement Challenges of large-scale indexing

Light Speed Unit Testing

In this article by Paulo Ragonha , author of the book Jasmine JavaScript Testing - Second Edition , we will learn Jasmine stubs and Jasmine Ajax plugin.

Using Mock Objects to Test Interactions

In this article by Siddharta Govindaraj , author of the book Test-Driven Python Development , we will look at the Event class. The Event class is very simple: receivers can register with the event to be notified when the event occurs. When the event fires, all the receivers are notified of the event. A more detailed description is as follows: Event classes have a connect method, which takes a method or function to be called when the event fires When the fire method is called, all the registered callbacks are called with the same parameters that are passed to the fire method Writing tests for the connect method is fairly straightforward—we just need to check that the receivers are being stored properly. But, how do we write the tests for the fire method? This method does not change any state or store any value that we can assert on. The main responsibility of this method is to call other methods. How do we test that this is being done correctly? This is where mock objects come into the picture. Unlike ordinary unit tests that assert on object state , mock objects are used to test that the interactions between multiple objects occurs as it should.

Managing Files, Folders, and Registry Items Using PowerShell

This article is written by Brenton J.W. Blawat , the author of  Mastering Windows PowerShell Scripting . When you are automating tasks on servers and workstations, you will frequently run into situations where you need to manage files, folders, and registry items. PowerShell provides a wide variety of cmdlets that enable you to create, view, modify, and delete items on a system. In this article, you will learn many techniques to interact with files, folders, and registry items. These techniques and items include: Registry provider Creating files, folders, registry keys, and registry named values Adding named values to registry keys Verifying the existence of item files, folders, and registry keys Renaming files, folders, registry keys, and named values Copying and moving files and folders Deleting files, folders, registry keys, and named values To properly follow the examples in this article, you will need to sequentially execute the examples. Each example builds on the previous examples, and some of these examples may not function properly if you do not execute the previous steps.

Hyper-V Basics

This article by Vinith Menon , the author of Microsoft Hyper-V PowerShell Automation , delves into the basics of Hyper-V, right from installing Hyper-V to resizing virtual hard disks. The Hyper-V PowerShell module includes several significant features that extend its use, improve its usability, and allow you to control and manage your Hyper-V environment with more granular control. Various organizations have moved on from Hyper-V (V2) to Hyper-V (V3). In Hyper-V (V2), the Hyper-V management shell was not built-in and the PowerShell module had to be manually installed. In Hyper-V (V3), Microsoft has provided an exhaustive set of cmdlets that can be used to manage and automate all configuration activities of the Hyper-V environment. The cmdlets are executed across the network using Windows Remote Management. In this article, we will cover: The basics of setting up a Hyper-V environment using PowerShell The fundamental concepts of Hyper-V management with the Hyper-V management shell The updated features in Hyper-V

Azure Storage

In this article by John Chapman and Aman Dhally , authors of the book, Automating Microsoft Azure with PowerShell , you will see that Microsoft Azure offers a variety of different services to store and retrieve data in the cloud. This includes File and Blob storage. Within Azure, each of these types of data is contained within an Azure storage account. While Azure SQL databases are also storage mechanisms, they are not part of an Azure storage account.

Creating Cool Content

In this article by Alex Ogorek , author of the book  Mastering Cocos2d Game Development you'll be learning how to implement the really complex, subtle game mechanics that not many developers do. This is what separates the good games from the great games. There will be many examples, tutorials, and code snippets in this article intended for adaption in your own projects, so feel free to come back at any time to look at something you may have either missed the first time, or are just curious to know about in general. In this article, we will cover the following topics: Adding a table for scores Adding subtle sliding to the units Creating movements on a Bézier curve instead of straight paths

Develop a Digital Clock

In this article by Samarth Shah , author of the book  Learning Raspberry Pi ,we will take your Raspberry Pi to the real world. Make sure you have all the components listed for you to go ahead: Raspberry Pi with Raspbian OS. A keyboard/mouse. A monitor to display the content of Raspberry Pi. If you don't have Raspberry Pi, you can install the VNC server on Raspberry Pi, and on your laptop using the VNC viewer, you will be able to display the content. Hook up wires of different colors (keep around 30 wires of around 10 cm long). To do: Read instructions on how to cut the wires. An HD44780-based LCD. Note; I have used JHD162A. A breadboard. 10K potentiometer (optional). You will be using potentiometer to control the contrast of the LCD, so if you don't have potentiometer, contrast would be fixed and that would be okay for this project. Potentiometer is just a fancy word used for variable resistor. Basically, it is just a three-terminal resistor with sliding or rotating contact, which is used for changing the value of the resistor.

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