Handled

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Zlata Praha, by Roman Boed

Module Binder Pattern proposal

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Whoa! This has been quite an event, the Directions EMEA 2016 in Prague. There has never been this many people (1.700+) and it was quite a pleasure connecting again with old friends, and meeting new friends. Also, it has been quite a pleasure listening to many good sessions, and an even bigger pleasure delivering four of them.

And this is why I am blogging now – to follow up on my promise during my Polymorphic Event Patterns for C/AL. I promised you that I’d post my pattern proposal online, and here I am doing it.

Let’s get started.

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Gentlemen’s agreement pattern, or handling the “Handled” pattern

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I’ve delved deep into design patterns story with my last two blog posts, but I am far from over. The patterns I discussed are the ones we could use up until NAV 2015 (we can still use them, of course!) but some more robust loose coupling (excuse the near-oxymoron) can be achieved with what NAV 2016 brought along: events.

It’s the “Handled” pattern. This pattern comes from Thomas Hejlsberg, a chief architect and CTO of Microsoft Dynamics NAV, and was first described by Mark Brummel on his blog. It’s a powerful loose-coupling pattern that successfully addresses the shortcomings of all design patterns I discussed earlier. I would prefer calling this pattern Event Façade rather than “Handled”, but it’s not my baby to christen.

Let’s take a look.

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