Abstract
Think about a trivial variable assignment, such as meaningOfLife = 42. The variable got assigned, but there’s no record anywhere that the assignment took place. Nobody can give us the previous value. We cannot take the fact of assignment and serialize it somewhere. This is problematic, because without a record of the change, we are unable to roll back to previous values, perform audits, or do history-based debugging.
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Notes
- 1.
We do have dedicated historical debugging tools such as Microsoft Visual Studio’s IntelliTrace or UndoDB.
- 2.
You can design your code in a Command-first fashion; that is, ensure that commands are the only publicly accessible API that your objects provide.
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© 2019 Dmitri Nesteruk
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Nesteruk, D. (2019). Command. In: Design Patterns in .NET. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-4366-4_15
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DOI: https://doi.org/10.1007/978-1-4842-4366-4_15
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Publisher Name: Apress, Berkeley, CA
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