On Wednesday, 16 March 2016 at 15:14:57 UTC, Kagamin wrote:
On Thursday, 10 March 2016 at 18:08:15 UTC, Eugene Wissner
wrote:
Why not just extend the HelloWorld class and override the
hello()? Imagine you write an apllication that should support
plugins. And two independent plugins extend the HelloWorld.
One plugin would conflict with the another. EventDispatcher
make it possible to register the events that can be used by
application plugins.
How about something like MEF?
I didn't know about MEF before, I've just read an article about
it, so correct me if I'm wrong. I think that MEF and such event
dispatcher aren't comparable. Event dispatching is one of the
principles how to extend the application. MEF as Wikipeda states
"aims to solve the runtime extensibility problem". The important
word is "runtime". So it is a higher level, it is about binding
different parts of application at runtime. (As I understand it).
Now Symfony, I'm inspired by, has a thing called Bundles. Bundles
are just application plugins. And event dispatching can be used
inside this bundles aswell. And it is the level where something
like MEF would be really great. I think it should be really done,
because it would make it possible for example to write closed
source plugins for open source applications (it is very common in
ecommerce, for example online shops, even for PHP, where you can
decode your plugins with something like ioncube).
Another area, where it could be used, is routing (already because
plugins should be able to add routes to the application at
runtime).
So concepts like MEF are anyway something very useful for
compiled applications/languages and I'll have to find a way to
implement it on some stage. Thanks for mentioning it.
