Kuidas erinevad Proxy ja Bridge mustrid nende eesmärgi ja rakendamise poolest?

The Proxy and Bridge patterns have different goals and implementation methods:

• Proxy

  • Purpose: control access to another object by adding additional logic (e.g., lazy initialization, caching, access control).
  • Implementation: create a proxy object that has the same interface as the real object and delegates calls, adding the necessary behavior.

• Bridge

  • Purpose: separate abstraction and implementation so they can be changed independently.
  • Implementation: the abstraction contains a reference to the implementation interface; concrete implementations can change without modifying the abstraction.

Example:

• Proxy is used when access to a resource-intensive object needs to be controlled.
• Bridge is used when supporting multiple implementation and abstraction variants, such as different platforms or output formats.

Thus, Proxy focuses on access control and additional logic around the object, while Bridge focuses on separation and independent development of abstraction and implementation.