September 2016
Intermediate to advanced
775 pages
18h 22m
English
Content preview from Python: Master the Art of Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Frequently asked questions
Q1. Can there be no Receiver and ConcreteCommand implement execute method?
A: Yes, it is definitely possible to do so. Many software applications use the Command pattern in this way too. The only thing to note here is the interaction between the invoker and receiver. If the receiver is not defined, the level of decoupling goes down; moreover, the facility to parameterize commands is lost.
Q2. What data structure do I use to implement the queue mechanism in the invoker object?
A: In the stock exchange example that we studied earlier in the chapter, we used a list to implement the queue. However, the Command pattern talks about a stack implementation that is really helpful in the case of redo or rollback development.
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