Exercise

Post-task

Question 1

Dependencies may be reduced by

the principles of dependency inversion

design patterns such as mediator, proxy, broker and facade

removing interface dependencies by using e.g. Null objects

exploiting messages and events

Question 2

Caller gets temporary control by exploiting

proxies

facades

callbacks

interfaces

Question 3

Event notification is a synonym of

internal state switch

callback

message-based communication

information push

Question 4

Select true statements:

Messages are more restricted than interfaces

Interface comprises information about e.g. parameters

Message constitutes such information as who is a caller and what is an input. (The caller is an original sender of a message)

When using interfaces, ServiceProvider must call a right interface with appropriate data

When using messages, ServiceProvider gets requester's messages through a broker

Question 5

Adapters:

disconnect a requester of provider’s interface

are units between broker and provider

enable interface modifications

implement mediator interface

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