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Refactoring Legacy


Software Refactoring is the process of transforming a legacy software application into a new application that is more modular, easier to maintain, and runs on modern hardware and operating system platforms. Software Refactoring is usually done in conjunction with Knowledge Modeling.

Interview Users - What do the users think the system does? Many legacy systems contain extensive sections of "dead" code. If the users no longer use a function or the users are not even aware of the existence of a function, it will make no sense to move that function to the new system.

Reconstruct Requirements - Establish the use cases for the system. What sorts of hardware should the new system support? What are the performance expectations and constraints? Model the Existing System - Using a high-quality modeling tool, establish the UML model for the existing system.

Model the New System - Lay out the logical and physical architecture of the new system.

Plan Re-User - What sections of the legacy code can be reused as is? Which could be reused after some level of automated processing? Which sections of code will need to be designed from scratch?

Project Plan - In most cases you company will not want to execute a flash cut-over from the old system to the new system. Wherever possible, it is better to partition the system into subsystems and migrate one at a time. Systems Integration Testing will also have to be planned together with the migration strategy.

Is your legacy application composed of page scripts placed directly in the document root of the web server? Do your page scripts, along with any other classes and functions, combine the concerns of model, view, and controller into the same scope? Is the majority of the logical flow incorporated as include files and global functions rather than class methods?

If so, you already know that the wide use of global variables means that making a change in one place leads to unexpected consequences somewhere else. These and other factors make it overly difficult and expensive for you to add features and fix bugs. Working with your legacy application feels like dragging your feet through mud. But it doesn't have to be that way! Modernizing Legacy Applications will show you how to modernize your application by extracting and replacing its legacy artifacts. We will use a step-by-step approach, moving slowly and methodically, to improve your application from the ground up.

Moreover, we will keep your application running the whole time. Each completed step in the process will keep your codebase fully operational with higher quality. When we are done, you will be able to breeze through your code like the wind. Your code will be autoloaded, dependency-injected, unit-tested, layer-separated, and front-controlled.

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