Proxy Pattern

Provide a surrogate or placeholder for another object to control access to it.

maintains a reference that lets the proxy access the real subject. Proxy may refer to a Subject if the RealSubject and Subject interfaces are the same.
provides an interface identical to Subject's so that a proxy can be substituted for the real subject.
controls access to the real subject and may be responsible for creating and deleting it.
other responsibilities depend on the kind of proxy:
- remote proxies are responsible for encoding a request and its arguments and for sending the encoded request to the real subject in a different address space.
- virtual proxies may cache additional information about the real subject so they can postpone accessing it.
- protection proxies check that the caller has the access permission required to perform a request.
this participant can not be read-only.
this participant can not be an interface.

defines the common interface for RealSubject and Proxy so that a Proxy can be used anywhere a RealSubject is expected.
this participant can not be read-only.

here you can specify the name of an attribute where the Proxy will keep a reference to the Real Subject object it represents.

the "Initialization variant" option defines the kind of initialization of that attribute.

when selected, will create special JavaDoc links in the code between pattern participants, describing their relationships.

Proxy is applicable whenever there is a need for a more versatile or sophisticated reference to an object than a simple pointer.