The company where I am currently employed is struggling with an architectural decision for our range of applications. At the moment we have a couple applications that have common parts (think like a calendar module). Until now we kept on copying code from other existing application, but in the future we want to evolve our applications to a more modular design:
As you can see in the picture above it is possible to have different versions of modules per application.
We are considering to possible solutions:
Any suggestions on this? We can't be the first company who struggles with this problem?All our applications are ASP.NET MVC 4/5 web applications, built with Razor Templates or JavaScript templates (knockout.js). All of our applications are deployed on Microsoft Azure and we have extensive inhouse knowledge of buildscripts (MSBuild), CI Servers...
Having separate project/assembly for each module and delivering it as Nuget package is definitely a good strategy.
Advantage:
Challenges:
During development debugging assembly code that's installed using Nuget. Nuget supports it inbuilt. We achieved it in our case (Framework being used by multiple platform).
Code changes required in module code (a bug or a new feature required). Well this is tricky:
Option 1: Same developer just go ahead and make that change, create new package and install new version in his app. Got to authorize the change as it is critical code.
Option 2: A designated team responsible to fix issue or change request in framework code.
You can also try using the plugin architecture, just build the different modules that makes up the application as a plugin, then build the module that is required for every application as a single code base. In this case, installing a component for any particular user, will be a matter of adding or pulling out plugins. Many large projects makes you of this particular architecture as it reduces copy and paste, increases and reuse and speed of development. You can check nopcommerce an open source project for an idea of how it is done.
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