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By your Command – Command design pattern

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Command design pattern is one of the widely known design pattern and it falls under the Behavioral Design Pattern (part of Gang of Four). As the name suggests it is related to actions and events in an application.   Problem statement: Imagine a scenario where we have a web page will multiple menus in it. One way of writing this ...

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Coherence Event Processing by using Map Trigger Feature

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This article shows how to process Coherence events by using Map Triggers. Basically, Distributed Data Management in Oracle Coherence is suggested to look over basic configuration and implementation of Oracle Coherence API Map Triggers are one of the most important features of Oracle Coherence to provide a highly customized cache management system. MapTrigger represents a functional agent that allows to ...

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Modeling Mongo Documents With Mongoose

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Without a doubt, one of the quickest ways to build an application that leverages MongoDB is with Node. It’s as if the two platforms were made for each other; the sheer number of Node libraries available for dealing with Mongo is testimony to a vibrant, innovative community. Indeed, one of my favorite Mongo focused libraries these days is Mongoose. Briefly, ...

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Don’t Use JSON And XML As Internal Transfer Formats http

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You have a system that has multiple components and they have to communicate. They do that either via internal web services or using a message queue. Normally, you would want to send (data transfer) objects from one component to another. Three typical examples: a user has registered and you send a message to a message queue and whenever the message ...

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Do you really get your IDE?

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This is bit like a philosophical post. Just some thoughts regarding our perception of developer tooling. First – a question. Which IDE do you use? Eclipse? NetBeans? IntelliJ IDEA? Visual Studio? Vim? Emacs? Yeah, really – Vim counts as an IDE as long as you can configure it to behave like one. Or maybe Sublime Text, a really awesome text ...

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Performance Analysis of REST/HTTP Services with JMeter and Yourkit

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My last post described how to accomplish stress- or load-testing of asynchronous REST/HTTP services with JMeter. However, running such tests often reveals that the system under test does not deal well with increasing load. The question is now how to find the bottleneck? Having an in-depth look at the code to detect suspicious parts could be one alternative. But considering ...

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MongoDB From the Trenches: Prudent Production Planning

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While starting out with MongoDB is super easy, there are few things you should keep in mind as you move from a development environment into a production one. No one wants to get paged at 3am because a customer can’t complete an order on your awesome e-commerce site because your database isn’t responding fast enough or worse, is down. Planning ...

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Investigating Deadlocks – Part 3

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In my previous two blogs in this series, part 1 and part 2, I’ve demonstrated how to create a piece of bad code that deadlocks and then used this code to show three ways of taking a thread dump. In this blog I’m going to analyze the thread dump to figure out what when wrong. The discussion below refers to ...

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JUnit Rules

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The first time I stumbled over a JUnit @Rule annotation I was a bit irritated of the concept. Having a public field in a test case seemed somewhat odd and so I was reluctant to use it regularly. But after a while I got used to that and it turned out that rules can ease writing tests in many ways. ...

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Android Reverse Engineering and Decompilation

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Reverse engineering of android java app using apktool, dex2jar, jd-gui to convert .apk file to .java. By reverse engineering of android app (.apk file) we can get following : understand how a particular UI in an App is constructed reading AndroidManifest.xml – permissions, activities, intents etc in the App native libraries and images used in that App obsfucated code ( ...

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