List/Grid Tag Archives: Design Patterns

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Implementing the State Machine Pattern as a Stream Processor

In my last blog, I said that I really thought that some of the Gang Of Four (GOF) patterns were becoming somewhat obsolete, and if not obsolete then certainly unpopular. In particular ...
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Java EE Revisits Design Patterns: Observer

Aside from being implemented in many languages and many applications, Observer Pattern has been a part of Java since version 1.0. Observer Pattern is also a good implementation of Hollywood ...
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The Strategy Pattern

In a recent blog on I received a comment from Wojciech Soczy?ski about how the “strategy” pattern can be used to enforce the Single Responsibility Principle (SRP) when using Tell ...
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Java EE Revisits Design Patterns: Asynchronous

Although you may not find Asynchronous method calls listed as a design pattern, I find it worth to mention. So here comes the last post of my JavaEE Revisits Design Patterns series. ...
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Concurrency Pattern: Producer and Consumer

In my career spanning 15 years, the problem of Producer and Consumer is one that I have come across only a few times. In most programming cases, what we are doing is performing functions ...
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GWT MVP made simple

GWT Model-View-Presenter is a design pattern for large scale application development. Being derived from MVC, it divides between view and logic and helps to create well-structured, ...
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The Wizard Design Pattern

We all love wizards…. (Software wizards I mean). We are always happy to jump on those ”Next” buttons like we were dancing the funky chicken on our… well you get ...
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Musing on mis-usings: ‘Powerful use, Damaging misuse’

There’s an old phrase attributed to the former British Prime Minister Benjamin Disraeli which states there are three types of lies: “lies, damn lies and statistics”.  ...
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Programming antipatterns

 Did you ever do a code review where you recorded an extremely high amount of WTF/m? And did you ever wonder what the cause of all this bad code is? Most of the time cause number ...
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Java EE6 Decorators: Decorating classes at injection time

A common design pattern in software is the decorator pattern. We take a class and we wrap another class around it. This way, when we call the class, we always pass trough the surrounding ...
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