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How to create Thread Pools using Java 5 Executor Framework


Java 5 introduced Thread pool in Java in form of Executor framework, which allows Java programmer to decouple submission of task to execution of task. If you are doing server side programming in Java than Thread pool is an important concept to maintain scalability, robustness and stability of system. For those, who are not familiar with thread pool in Java ...

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Introducing Android Migrations


Have you ever worked with Rails’ migrations? They make database changes a breeze, don’t they? While every software release doesn’t necessarily involve a migration, when one does happen to make use of one, I’m always pleased on how easily things work out. Whether it’s to add new data or alter existing data structures, Rails migrations make evolving a datastore (be ...

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Immutable Servers With Packer and Puppet


Lately I’ve been becoming more and more of a fan of is the concept of Immutable Servers while automating our infrastructure at Zapier. The concept is simple: never do server upgrades or changes on live servers, instead just build out new servers with applied updates and throw away the old ones. You basically get all the benefits of immutability in ...

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The NoSQL moniker that was coined circa 2009 marked a move from the “traditional” relational model. There were quite a few non-relational databases around prior to 2009, but in the last few years we’ve seen an explosion of new offerings (you can see,for example, the “NoSQL landscape” in a previous post I made). Generally speaking, and everything here is a wild ...

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Building a Manufacturing Service Bus (MSB) with WSO2 ESB


Before getting in to the subject, I would like to introduce few terminology commonly used in the manufacturing industry. The term Manufacturing Execution System (MES) was coined by AMR Research in 1990, the MES concept has evolved for almost three decades from the development of advanced, computer information systems for manufacturing. Following is the definition on an MES from the ...

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Converting Grails Applications to Plugins and vice versa


I was in London last week on vacation with my family and was lucky that there was a London GGUG meetup during my visit. David Dawson discussed modularizing Grails applications by refactoring them into multiple plugins (you can see the video of his talk here). One thing that he mentioned was the idea of plugins that can be run like ...

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Advanced scripting in Activiti: Custom Configuration Injection


The scripting task is probably one of the ‘oldest’ classes in the Activiti code base, but I think it is still underused by many. The (perceived?) downsides are of course performance (interpretation vs compilation) and less support from IDE perspective. However, the benefits (imo) outweigh this: Scripts are defined in the process xml itself. No more worries about versioning and ...

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Job Hopping For Geeks


I first wrote about the topic of job hopping back in 2007 and I feel the advice I gave then is still relevant in 2013, although the perceptions and attitudes of most hiring managers have evolved significantly.  The post in 2007 was partly inspired by a past client (financial trading firm) that would only accept résumés of software engineers that were ...

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Why You Can’t Work For Google


Many new entrants to today’s technology job market are obsessed with the handful of high-profile companies that set the trends in the industry, and the next generation of software engineers seem to think that the only companies worth working for are Google, Microsoft, Apple, Facebook, Yahoo, Twitter, and Amazon.  Software development has become both a celebrity culture (where companies and ...

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