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Functional Reactive Programming and JavaScript

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Functional reactive programming (FRP) is an emerging programming paradigm that has recently gained popularity in the web world. That popularity isn’t just tied to fact that the video streaming giant Netflix blogged about how it applies FRP to optimize its API, but because it actually provides an elegant way to reduce the complexity of dealing with time-varying events and asynchronous ...

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Test Attribute #9 – Deterministic

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I keep hammering on trust and how it’s crucial that we trust our tests. If a test is deterministic, it raises the level of our trust.  If it isn’t, we may question its result, which will be followed by questioning other tests as well. Let’s start with a simple example. What’s wrong with this picture?           ...

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How to use the new Apache Http Client to make a HEAD request

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If you’ve updated your Apache HTTP Client code to use the newest library (at the time of this writing it is version 4.3.5 for the httpclient and version 4.3.2 for httpcore) from the version 4.2.x you’ll notice that some classes, like org.apache.http.impl.client.DefaultHttpClient or org.apache.http.params.HttpParams have become deprecated. Well, I’ve been there, so in this post I’ll present how to get ...

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Command Design Pattern Applied

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Hi there! Today i’m gonna share with you a really great programming design pattern. It has a lot of usages and it is one of my favorites. The programming degin pattern command has a huge variety of use cases. In this post we will see how to implement something from the real world. We will implement an electronic car key ...

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Try optimising the memory consumption first

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Overview You would think that if you wanted your application to go faster you would start with the CPU profiling.  However, when looking for quick wins, it’s the memory profiler I target first. Allocating memory is cheap Allocating memory has never been cheaper.  Memory is cheaper, you can get machines will thousands of GBs of memory. You can buy 16 ...

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EJB 3.x : Lifecycle and Concurrency models (part 1)

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Java EE component life cycle and concurrency related details might not be new for seasoned professionals, but it is something which can take time to sink in for beginners.                 As far as EJBs are concerned, understanding their life cycle (and related concurrency scenarios) is extremely critical in order to ensure appropriate usage and solution ...

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OSGi: the gateway into micro-services architecture

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The terms “modularity” and “microservices architecture” pop up quite often these days in context of building scalable, reliable distributed systems. Java platform itself is known to be weak with regards to modularity (Java 9 is going to address that by delivering project Jigsaw), giving a chance to frameworks like OSGi and JBoss Modules to emerge. When I first heard about ...

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IDE: 5 most favorite NetBeans features

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Development with pleasure…. NetBeans has many interesting features that make development very easy, with few steps, and makes for a very productive environment, in terms of getting your product to market very quickly. It is very hard to limit my talking to only five features, while this IDE has tons of interesting features. But here I am going to mention ...

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Applying decorator pattern to decorate views on Android

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Hi there! Today i’m gonna show how to apply the design pattern decorator to android’s views making use of its dependency injection’s concept. I thought it was a nice, clear and simple way to decorate views and that’s my motivator to share it with you. I’m assuming you know the decorator pattern already and are looking for real examples involving ...

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