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Hollywood Principle Jun Hu 18-01-08

Hollywood principle

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Page 1: Hollywood principle

Hollywood Principle

Jun Hu

18-01-08

Page 2: Hollywood principle

Don’t call us, we’ll call you

Page 3: Hollywood principle

What’s the concept?

• Two step process: – registration and callback

Page 4: Hollywood principle

So, what’s the concept?

• Registration

Page 5: Hollywood principle

• Callback

So, what’s the concept?

Page 6: Hollywood principle

• Inversion of CONTROL

What’s the big deal?

Page 7: Hollywood principle

What’s the big deal?

Page 8: Hollywood principle

What’s the big deal?

• Low coupling

Page 9: Hollywood principle

Software engineer’s version

• Hollywood, Bollywood => Observable

• Actors, actresses => Observers

Page 10: Hollywood principle

Observer Pattern

Page 11: Hollywood principle

Mathematician’s version

Page 12: Hollywood principle

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