Earlier in the Chatterbox, I asked the following:

<atcroft> Anyone know a good module or tutorial on writing code to have the ability to add functionality using plugins/addons/modules?

There were a few replies mentioning Module::Pluggable, or to look at double dispatch and rolling my own method. So, what are your (insight|opinions|thoughts) on it, or do you have (links|references|specific modules) you can point me to?

(My thanks to LanX, MidLifeXis, and Voronich, for suggesting I post this for response from the larger community.)

Update: 2013-12-30
There have been several comments asking for more detail on what I had in mind. I had wanted to get general feedback, but the (personal) project I have in mind that would use this is a program looking at files dumped into a subdirectory and initially recording a small amount of information, but I wanted a more modular way of adding in additional capabilities for specific file types (for example, have the initial program working, then add in a module for retrieve EXIF information from JPGs in the directory or to process MBOX files at a later date, without having to modify the initial (possibly running) program).

In reply to Recommendations for adding plugin/addon capability to a program by atcroft

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