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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Use cases
The Decorator pattern shines when used for implementing cross-cutting concerns [Lott14, page 223], [j.mp/wikicrosscut]. Examples of cross-cutting concerns are:
- Data validation
- Transaction processing (A transaction in this case is similar to a database transaction, in the sense that either all steps should be completed successfully, or the transaction should fail.)
- Caching
- Logging
- Monitoring
- Debugging
- Business rules
- Compression
- Encryption
In general, all parts of an application that are generic and can be applied to many other parts of it, are considered cross-cutting concerns.
Another popular example of using the Decorator pattern is Graphical User Interface (GUI) toolkits. In a GUI toolkit, we want to be able to add features such as borders, ...
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