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Proxy Design Pattern

We use this Pattern when we require don't want to give a direct access to object under some scenario and rather offer a surrogate object  or proxy object which  provides the functionality in place of the real object.
There could be several scenario where we would want this kind of functionality.

  1. The  real object  has some sensitive operation which would be risky to expose.
  2. The real object creation is memory extensive so we want to control the behavior of its creation.
  3. The real object is remotely located and rather we want to interact through a local copy using proxy which is actually   aware of it location.
So lets look at the UML diagram of the same.


So here we have Subject interface which is implemented by both the Proxy and RealObject  and proxy object has  reference to the real object , now the client will  instantiate Proxy object to perform some action and , proxy object will delegate the call to RealSubject to perform the same.
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Location: Bengaluru, Karnataka, India

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