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Modernization or the process of modernizing old legacy application code to new models of design involves updating the existing codebase to take advantage of new technologies and design patterns. This process can be time-consuming and complex, but it is often necessary to improve the performance, scalability, and maintainability of the application.
For example, let’s consider a retail company that has an old legacy application that was built using monolithic architecture. The application has grown over time, and it’s becoming increasingly difficult to maintain, scale, and add new features. To modernize the application, the company might decide to move to a microservices architecture. This would involve breaking the monolithic application into smaller, independent services that can be developed, deployed, and scaled independently. This approach would make it easier to maintain and scale the application, as well as adding new features.
Another example, let’s say an old legacy application was built using older version of a programming language, that’s no longer supported and difficult to find developers with the expertise to maintain it. The company can decide to rewrite the application using a more modern language that is widely used, has a large developer community, and is supported by more development tools. This can also improve the performance, scalability and maintainability of the application.
Overall, modernizing old legacy application code to new models of design can be a complex process, but it can lead to significant improvements in the performance, scalability, and maintainability of the application.
A final option if an old legacy application is impossible to rewrite or refactor is to wrap it in a process that allows the old application to run on newer OS while still maintaining the legacy components that it expects in order to run. An example would be an old Windows server 2008 application that requires DLLs and Registry entries that no longer exist on new server versions, this would make upgrading the server impossible without breaking the application. Until now in order to preserve security and limit the risk an old OS poses as far as hacks and viruses we would resort to airgapping or isolating the server form internet resources. Now however there is technology that can wrap the legacy app in a protected and isolated process that runs on a new version of server OS while maintaining the legacy requirements and greatly minimizing the security risk of running an out of support OS.