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Why Your Boring Data Will Outlast Your Sexy New Technology

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So you’re playing around with all those sexy new technologies, enjoying yourself, getting inspiration from state-of-the-art closure / lambda / monads and other concepts-du-jour… Now that I have your attention provoking a little anger / smirk / indifference, let’s think about the following. I’ve recently revisited a great article by Ken Downs written in 2010. There’s an excellent observation in ...

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Zabbix – Low Level Discovery of cores, CPUs and Hard Disk

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Zabbix SSD Status, configured with Low Level Discovery At home, I’m using Zabbix to monitor my servers, it has plenty of interesting features and can be extended a lot by using User Parameter. In this post, I’m gonna talk about Low Level Discovery (LLD). If you are only interested in the final result, go the Conclusion section, you can download ...

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Mirror Mirror – Using Reflection To Look Inside The JVM at Run-time

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Developers: Takipi tells you when new code breaks in production –  Learn more We’re all used to employing reflection in our everyday work, either directly, or through frameworks that leverage it. Its a main aspect of Java and Scala programming that enables the libraries we use to interact with our code without hard-coded knowledge of it. But our use of reflection ...

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AppFuse 3.0

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AppFuse 3.0 is here, as announced by AppFuse. AppFuse is a full-stack framework for building web applications on the JVM. It uses the Maven Archetype plugin to generate a starter Java project, so that one can get easily start creating a full Java EE application. As explained in AppFuse 3.0 – Java 7, Spring 4, PrimeFaces, Mockito, Bootstrap 3, Wicket, ...

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Publish and Subscribe with Hazelcast

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A few weeks ago I wrote a blog on getting started with Hazelcast describing how ludicrously simple it is to create distributed maps, lists and queues. At the time I mentioned that Hazelcast does quite a few other things besides. This blog takes a quick look at another of Hazelcast’s features: its broadcast messaging system based on the Publish/Subscribe pattern. ...

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Want to get faster with AtomicLong? Make it wait.

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I often hear that Java atomic types (java.util.concurrent.atomic) are super-fast and play nicely with highly concurrent code. Most of the time, atomics do their job in a robust and efficient manner. However, there are scenarios in which the hidden cost of unmanaged contention on atomic types becomes a serious performance issue. Let’s take a look at how  java.util.concurrent.atomic.Atomic* types are ...

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How to serialize an array of doubles with a byte (binary delta encoding for low-varianced monotonic sets of floating point data)

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Low latency systems require high performance message processing and passing. As in most cases data has to be transfered over the wire or serialised for persistence, encoding and decoding messages become a crucial part of the processing pipeline. The best results in high performance data encoding usually involve applying knowledge of application data specifics. The technique presented in this article ...

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A Beginner’s guide to ACID and database transactions

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Transactions are omnipresent in today’s enterprise systems, providing data integrity even in highly concurrent environments. So let’s get started by first defining the term and the context where you might usually employ it. A transaction is a collection of read/write operations succeeding only if all contained operations succeed. Inherently a transaction is characterized by four properties (commonly referred as ACID) ...

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Using Google GSON : Extra Goodies : Part II

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We continue with Using GSON from last article, also in case you missed the first article in series here is link. So, here we go with another installment in series. Versioning Support If you want to maintain multiple versions of an object for JSON conversion, Google GSON library has nice @Since annotation for it. This annotation can be applied to ...

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Grails: Using Hibernate Filters

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The Grails Hibernate Filters plugin makes it possible to use Hibernate Filters with GORM. Hibernate Filters provide additional restriction rules that can be applied to classes and collections. The Hibernate Filters plugin makes it possible to use this functionality with GORM inside Grails applications. Let’s look at an example to see how filters can help us. Assume we have the ...

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