题目内容

Rails' ActiveRecord module defines an AbstractAdapter for connecting to databases. Subclasses of AbstractAdapterexist for each database type and can be added for new databases; when the app starts, the correct one is instantiated based on config/database.yml. Which SOLID principles is NOT illustrated by this example?

A. Open/Closed principle
B. Dependency Injection
C. Demeter principle
D. Liskov substitution

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Which statement regarding design patterns is FALSE?

A. P-D processes have an explicit design phase that is a natural fit to the use of design patterns and thus will have a good SW architecture
B. P&D drawback: initial architecture & design patterns may change as code written and system evolves
C. Agile developers may plan for SW architectures and design patterns they expect to need based on previous, similar projects
D. None are false; All are true

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Which of the following would be reasonable uses of the Composite pattern in RottenPotatoes?a. Movies can be organized into Playlistsb. Moviegoers can be organized into groups

A. a. only
B. b. only
C. Both a. and b.
D. Neither a. nor b.

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Which design pattern is used to invalidate a cached page after the underlying data has changed?

Adapter
B. Decorator
C. Strategy Observer
D. Observer

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What technique allows fragment caching to prevent ActiveRecord from ever contacting the database even after an ActiveRecord query is made (such as Movie.all)?

A. Cache invalidation
B. Lazy evaluation
C. A content delivery network
D. Lambda calculus

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A. Open/Closed principle B. Dependency Injection C. Demeter principle D. Liskov substitution

Which statement regarding design patterns is FALSE?

Which of the following would be reasonable uses of the Composite pattern in RottenPotatoes?a. Movies can be organized into Playlistsb. Moviegoers can be organized into groups

Which design pattern is used to invalidate a cached page after the underlying data has changed?

What technique allows fragment caching to prevent ActiveRecord from ever contacting the database even after an ActiveRecord query is made (such as Movie.all)?

A. Open/Closed principle
B. Dependency Injection
C. Demeter principle
D. Liskov substitution