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Creating External DSLs using ANTLR and Java

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In my previous post quite sometime back I had written about Internal DSLs using Java. In the book Domain Specific Languages by Martin Fowler, he discusses about another type of DSL called external DSLs in which the DSL is written in another language which is then parsed by the host language to populate the semantic model. In the previous example ...

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How to implement Document Versioning with Couchbase

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Introduction Developers are often asking me how to “version” documents with Couchbase 2.0. The short answer is: the clients and server do not expose such feature, but it is quite easy to implement. In this article I will use a basic approach, and you will be able to extend it depending of your business requirements. Design The first thing to ...

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Agile Development leads to Alzheimer’s

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Iterative development and design helps you to reach your way towards understanding what the customer really needs, to try out new ideas, evaluate designs, experiment, respond to feedback and react to changing circumstances. Everything gets better as you learn more about the domain and about the customer and about the language and technologies that you are using. This is important ...

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We Should Not Make (or Enforce) Decisions We Cannot Justify

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Software development is a strange industry. New technologies emerge in a fast pace and old technologies become obsolete. The ability to learn new technologies is considered as a sign of a great software developer. It is expected from all of us. And yet, all of us don’t welcome these new technologies and ideas with open arms. Let’s consider the following ...

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Why Write Requirements

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There is a lot of advice out there for how to write requirements. There is not as much discussion about why to write requirements. Spend some time thinking about why you write requirements before you make decisions about how to write your requirements. Why Write Requirements? Whether you communicate requirements through conversation, user stories with acceptance criteria, or traditional structured ...

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Android Actionbar Drop Down navigation

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ActionBar supports different navigation types within activities. We saw in an older post that we can use Tabs to navigate or we can use Drop Down Navigation. In this post we will see how we can implement the drop down navigation using fragments. What is exactly the drop down navigation? It is essentially a list of items in the actionbar. This items represent action ...

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Getting Started With Spring’s MVC Test Framework – Part 2

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The first blog in this mini-series introduced the Spring MVC Test Framework and demonstrated its use in unit testing Spring MVC Controller classes as controllers rather then as POJOs. It’s now time to talk about using the framework for integration testing. By ‘integration testing’ I mean loading the Spring context into the test environment so that the controller can work with ...

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JPA 2 | Fetch Joins and whether we should use them

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Introduction Recently I have been working with FETCH JOINS in JPA 2 to fetch the data eagerly from the Database and I learned quite a lot on why we should avoid using Fetch Joins in our day to day operations. Today’s blog post talks about my experience with Fetch and my learning (based mostly on the review comments I got ...

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Java Garbage Collection Distilled

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Serial, Parallel, Concurrent, CMS, G1, Young Gen, New Gen, Old Gen, Perm Gen, Eden, Tenured, Survivor Spaces, Safepoints, and the hundreds of JVM startup flags. Does this all baffle you when trying to tune the garbage collector while trying to get the required throughput and latency from your Java application? If it does then do not worry, you are not ...

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Enhanced Groovy-based JAR/Manifest Diff Tool

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This brief blog post provides another Groovy script that provides simple differencing of two JAR (or WAR or EAR) files and their MANIFEST.MF files. It represents a combination of the JAR comparison script I blogged on earlier, Rick‘s addition of Groovy‘s CliBuilder to allow some output data to be turned off, my MANIFEST.MF comparison script, and an ability to use ...

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