December 2017
Intermediate to advanced
468 pages
13h 12m
English
book
Architectural Patterns
by Anupama Murali, Pethuru Raj, Harihara Subramanian J, Pethuru Raj Chelliah
Content preview from Architectural Patterns
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Observer (dependents/publish/subscribe)
The Observer pattern suggests that when one object changes the state, it notifies its dependents and updates automatically. When implementation is in need of one-to-many dependencies, you would want to use this pattern.
The preceding diagram depicts Observer pattern structure and a sample implementation of the same for a publications app; whenever an event occurs, subscribers need to be informed. The subscribers have a different mode of publishing (SMS, print, and emailing) and may need to support new modes as well in the future, so the best fit is Observer, as we just saw.
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