Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Embrace Your Legacy Code. But Only Once

DZone's Guide to

Embrace Your Legacy Code. But Only Once

· Java Zone ·
Free Resource

Verify, standardize, and correct the Big 4 + more – name, email, phone and global addresses – try our Data Quality APIs now at Melissa Developer Portal!

If you have to deal with legacy code (and we all do) one of the standard techniques to deal with it is to hide it behind a layer of abstraction.

While this is a valid pattern that helps in many cases, it comes with its own anti pattern.

I call it Legacy in an Onion.

It’s what happens when every generation of developer considers whatever they find to be horrible legacy code.
So they create a layer of abstraction. The next generation considers the abstraction to be legacy and adds another layer of abstraction.
After a couple of generations all the different layers start to cause serious problems when trying to understand the code and possibly even when executing it.

So the next time you encounter legacy code and want to add a layer of abstraction, rub the legacy code a little. Maybe you can peel of a layer of abstraction. If you find such a layer, you have multiple options:

  • Improve it so it fits your needs
  • Replace it with your layer
  • Directly work with the stuff below the layer

Just don’t add a layer of abstraction just for the sake of adding a layer of abstraction.

 

From http://blog.schauderhaft.de/2011/09/25/929/

Developers! Quickly and easily gain access to the tools and information you need! Explore, test and combine our data quality APIs at Melissa Developer Portal – home to tools that save time and boost revenue. Our APIs verify, standardize, and correct the Big 4 + more – name, email, phone and global addresses – to ensure accurate delivery, prevent blacklisting and identify risks in real-time.

Topics:

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}