List/Grid Tag Archives: Design Patterns

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Code Refactoring vs Architecture Refactoring

Introduction Everybody knows the meaning of Refactoring; the base of Agile Programming, and the best way to continuously increase the code quality. But Refactoring is not always the ...
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Building smart Builders

When building an API, you should always think about who is going to use it. When the API is simply and clear to use, then the users are happy. When the users are happy then everyone ...
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Train Wreck Pattern – A much improved implementation in Java 8

Venkat Subramaniam at a talk today mentioned about Cascade Method pattern or Train Wreck pattern which looks something like:                   >someObject.method1().method2().method3().finalResult() Few ...
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Template Method Pattern – Using Lambda Expressions, Default Methods

Template Method pattern is one of the 23 design patterns explained in the famous Design Patterns book by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides. The intent of this ...
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Publish/Subscribe Pattern with Apache Camel

Publish/Subscribe is a simple messaging pattern where a publisher sends messages to a channel without the knowledge of who is going to receive them. Then it is the responsibility of ...
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A Theorical Look into Object/Resource Pool Pattern

Definition: Sometimes our software projects need costly object creations (database connections, socket connections, large graphical objects etc.). This cost may be about time and/or ...
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Gang of Four Patterns With Type-Classes and Implicits in Scala

Type-classes, as they’re known within the Scala language, have a wonderful place in library development. They make code open to extension, less verbose and simplify APIs. I’ve yet ...
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Template method design pattern in Java

Template method pattern is a behavioral design pattern which provide base method for algorithm,called template method which defers some of its steps to subclasses So algorithm structure ...
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Observer design pattern in Java

As the name suggests it is used for observing some objects.Observer watch for any change in state or property of subject.Suppose you are interested in particular object and want to ...
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Singleton Design Pattern – An introspection and best practices

Definition: Singleton is a part of Gang of Four design pattern and it is categorized under creational design patterns. In this article we are going to take a deeper look into the usage ...
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