题目内容

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

Adapter
B. Decorator
C. Strategy Observer
D. Observer

查看答案

搜索结果不匹配？点我反馈

更多问题

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

查看答案

You have just implemented several levels of caching in your web application. A user calls to tell you that when they visit the site, they see another user's name as the currently logged in user. Assuming that nobody else has used the user's computer, This problem could stem from a stale (select all that apply):

A. Browser cache
B. Page cache
C. Action cache
D. Query cache

查看答案

Suppose Order belongs to Customer, and a view has @order.customer.name. Is this a Demeter violation?

A. Yes...but probably reasonable to just expose object graph in the view in this case
B. Yes...replace with Order#customer_name which delegates to Customer#name
C. Yes...you can make a case for either of the above
D. No...by using belongs_to we're already exposing info about the Customer anyway

查看答案

The use of FakeWeb to stub external SOA requests in testing is an example of which design pattern?- 未答复

A. Null object
B. Proxy
C. Adapter
D. Facade

查看答案

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

Adapter B. Decorator C. Strategy Observer D. Observer

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

Suppose Order belongs to Customer, and a view has @order.customer.name. Is this a Demeter violation?

The use of FakeWeb to stub external SOA requests in testing is an example of which design pattern?- 未答复

Adapter
B. Decorator
C. Strategy Observer
D. Observer