Day 3 of Software Architect 2012 from London has passed. Today
was a great day for science also. I went at 3 sessions sustained by Allen Holub. This man is not only a great speaker, but also knows the programing art
extremely good.
Like in the other post about conferences where I participate,
I will present in some words the things that I consider important.
Now we are living in a world that where OOP is everywhere.
We are trying to create a model for each object from this world, but there are
times when we forget base things. An object should expose a set of
functionalities and not information. Sounds odd in our days, where everything
is a POCO or a service, but this is how we should write our classes.
A world that is formed from POCO and services is not more
than a procedural programing. In this case let’s change the name from OO to
Procedural Programing. An object should be defined by what can do, what actions
contain – public methods; and not by data that he contains. The content is not important;
the functions that are exposed are the most important.
This is easy to say, but trust me, it is very hard to
implement. For example when we have a class that want to calculate the price
with VAD and deduction of a product we create a separate class for this. This calculator
class will access the price property of our product. But we don’t need something
like this. It is not wrong to have a method that returns the final price of the
product in our product class. Yes, of course, as input parameter or in
constructor we can specify an instance of an object that knows how to calculate
(the final formula).
There are lot more thing to talk about this subject. I
promise that every week I will have a dedicated post related to OOP and design.
Until than I will buy this book and start reading.
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