February 2016
Beginner to intermediate
164 pages
3h 25m
English
book
Learning Python Design Patterns - Second Edition - Second Edition
by Chetan Giridhar, Gennadiy Zlobin
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The Observer pattern – advantages and disadvantages
The Observer pattern provides you with the following advantages:
- It supports the principle of loose coupling between objects that interact with each other
- It allows sending data to other objects effectively without any change in the
SubjectorObserverclasses Observerscan be added/removed at any point in time
The following are the disadvantages of the Observer pattern:
- The Observer interface has to be implemented by
ConcreteObserver, which involves inheritance. There is no option for composition, as the Observer interface can be instantiated. - If not correctly implemented, the
Observercan add complexity and lead to inadvertent performance issues. - In software application, notifications can, at times, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.