Proxy Design Pattern (Software Design Patterns Tutorial)

******************** Proxy Design Pattern:
Proxy - “in place of” or “representing” or “on behalf of”
Placeholder for another object to control the access.
Proxy is the object that is being called by the client to access the real object behind the scene.
The proxy pattern represents the functionality of another class.
Virtual proxy is a placeholder for “expensive to create” objects. The real object is only created when a client requests/access the object.
The remote proxy provides a local representative for an object that resides in a different address space.
Protective proxy controls access to a sensitive master object. It checks whether the caller has permission and etc.

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