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The Proxy Pattern
The Proxy pattern is used when you need to represent an object that is complex or time consuming to create by a simpler one. If creating an object is expensive in time or computer resources, a proxy enables you to postpone this creation until you need the actual object. A proxy usually has the same methods as the object it represents; when the object is loaded, it passes on the method calls from the proxy to the actual object.
There are several cases where a Proxy can be useful:
If an object, such as a large image, takes a long time to load.
If the object is on a remote machine and loading it over the network might be slow, especially during peak network load periods.
If the object has limited access rights. The proxy then ...
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