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11 lines
538 B
Markdown
11 lines
538 B
Markdown
## Observer
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Observer defines a one-to-many dependency between objects so that when one object
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changes state, all its dependents are notified and updated automatically. The pattern
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has behavioral purpose and applies to the objects.
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### When to use
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* when an abstraction has two aspects, one dependent on the other
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* when a change to one object requires changing others, and you don't know how many objects need to be changed
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* when an object should be able to notify other objects without making assumptions about who these objects are |