• Intent:
  • middleman between client and actual object
• Components
  • Subject (common inteface) ⇒ shared between proxy and actual object
  • Real subject ⇒ the actual object that is being proxied
  • Proxy ⇒ holds reference to real subject
• Difference with decorator
  • Decorator ⇒ add new responsibilities/features to the object without changing class code (e.g., logger)
  • Proxy ⇒ Controlling access to an object
    • Controlling lifecycle of objects (e.g, lazyloading, caching proxy)
    • Auth proxy ⇒ controlling access to an object (for api endpoints use a wrapper)
• Use cases
  • Protection proxy ⇒ controlling access to objects
  • Virtual proxy ⇒ controlling access for object creation
  • Cache proxy ⇒ controlling access for method invokation