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When git ignores your… .gitignore?

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I feel like I should start this post saying that I absolutely love git. If you’ve never heard of it, is a source control system like CVS or Subversion but, unlike those two, is a distributed version control system. I’m not going to get into much details about the history and capabilities of git but if you’re curious about it ...

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Java Memory Model and optimisation

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Overview Many developers of multi-threaded code are familiar with the idea that different threads can have a different view of a value they are holding, this not the only reason a thread might not see a change if it is not made thread safe. The JIT itself can play a part. Why do different threads see different values? When you ...

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Scala: Collections 1

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This post contains some info on Scala’s collections. Problem? We want a function that will take an List of Rugby players as input and return those players names that play for Leinster and can run the 100 meters from the fastest to the slowest. Step 1: Have a representation for a Rugby player. Ok so it’s obvious we want something ...

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Structural (or) Type Safe Duck Typing in Scala

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Structural typing as defined by Wikipedia “A structural type system (or property-based type system) is a major classof type system, in which type compatibility and equivalence are determined by the type’s structure, and not by other characteristics such as its name or place of declaration “ Strutural types in scala allows code modularity for some specific situations.For instance, if a ...

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Loan pattern in Java (a.k.a lender lendee pattern)

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This post is about implementing loan pattern in Java. Use Case Implement separation between the code that holds resource from that of accessing it such that the accessing code doesn’t need to manage the resources. The use case mentioned holds true when we write code to read/write to a file or querying SQL / NOSQL dbs. There are certainly API’s ...

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SpiderMonkey to V8 for MongoDB and mongometer

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With 10gen switching the default JavaScript engine for MongoDB 2.3/2.4 from SpiderMonkey to V8 I thought I’d take the opportunity to compare the relative performances of the releases using mongometer. Being a Security bod, I really should have looked at the Additional Authentication Features first… Hey ho. I’ll document the steps taken during the comparison, including the set up, so ...

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Spring MVC 3: Upload multiple files

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It was just another long day at office with the database not available and one of the team members lagging by a week now. So, we had to work as a team to get it delivered. In Spring 3, it looked straight forward to upload a file. However, there was little help on offer, to upload multiple files from a ...

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Spring Data JDBC generic DAO implementation – most lightweight ORM ever

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I am thrilled to announce first version of my Spring Data JDBC repository project. The purpose of this open source library is to provide generic, lightweight and easy to use DAO implementation for relational databases based on JdbcTemplate from Spring framework, compatible with Spring Data umbrella of projects.               Design objectives Lightweight, fast and ...

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Effective Logging in Java/JEE – Mapped Diagnostic Context

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It all started when i was sitting with a colleague to resolve some application issue, when i noticed something interesting. He was merging the code and my eyes caught the attention of this class “org.apache.log4j.MDC”. This led to few discoveries on the way which  follow here: What is MDC? MDC stands for Mapped Diagnostic Context. It helps you to distinguish ...

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Android TextView with custom fonts

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While developing an android app I found that everytime I was trying to use a custom font on a TextView I copied the same lines:                   TextView textview = (TextView) findViewById(R.id.text); textview.setTypeface(...) Obviously, that’s unnecessary and repetitive. Why not just create a custom view? And more, why not adding the font through ...

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