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From Layers to Microunits

The evolution of “Code Cohesion” and “Separation of Concerns”

The software industry has recognized the values of “Separation of Concerns” and “Code Cohesion” for more than two decades. Many articles, books and software-thinkers have contributed methodologies to implement these important values.

In this short article I’d like to compare the conservative “Layers” solution with a new approach, which I call “Microunits”, that can open new ways of solving software design challenges.

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GetHashCode Hands-On Session

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The GoF Hot Spots - Factory Method vs Abstract Factory

As part of my "GoF Design Patterns - The Hot Spots" posts series, this post is focused on two Creational Design Patterns: Factory Method and Abstract Factory.

We will dig into the original GoF Design Patterns (aka: DP) description trying to figure out the real Hot Spots (aka: specific particular parts that differentiating them from each other) of these two DPs and the relationship between them.

In order to maximize the clarity of this article, I used two conventions:
Phrases inside [square brackets] are meant to help understanding GoF definitionsItalic sentences are GoF's book citationsFactory Method GoF Definition:" [1] Define an interface for creating an object, [2] but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses."
GoF Description & Hot Pots: "Consider a framework for applications that can present [handle] multiple documents to the user. Two key abstractions in this framework are t…
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Method Breakpoints are Evil

Some IDEs expose an option to set "Method Breakpoints", it turns out that "Method Breakpoints" might tremendously decrease debugger's performance. In this article, I explain what are "Method Breakpoints" and the reasons they impact performance so badly. To better understand this subject I will cover how Debuggers works under the hoods and how Breakpoints and Method Breakpoints are implemented internally. Java Platform Debugger Architecture JDPA is an architecture designed for enabling communication between debuggers and debugees. The architecture consists of three APIs: JVM Tool Interface (JVM TI) - A native interface which defines the services a VM must provide for debugging purposes Java Debug Wire Protocol (JWDP) - A textual API which defines the communication's protocol between debugee and debuggerJava Debug Interface (JDI) - Defines a high-level Java API designed to facilitate the interaction between debugge and debuggers. Internally J…
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