Proxy pattern - Wikipedia. In computer programming, the proxy pattern is a software design pattern. A proxy, in its most general form, is a class functioning as an interface to something else. The proxy could interface to anything: a network connection, a large object in memory, a file, or some other resource that is expensive or impossible to duplicate.
In short, a proxy is a wrapper or agent object that is being called by the client to access the real serving object behind the scenes. Use of the proxy can simply be forwarding to the real object, or can provide additional logic. In the proxy, extra functionality can be provided, for example caching when operations on the real object are resource intensive, or checking preconditions before operations on the real object are invoked. For the client, usage of a proxy object is similar to using the real object, because both implement the same interface. Possible Usage Scenarios. The local object is a proxy for the remote object, and method invocation on the local object results in remote method invocation on the remote object.
An example would be an ATM implementation, where the ATM might hold proxy objects for bank information that exists in the remote server. Virtual Proxy. When an underlying image is huge in size, it may be represented using a virtual proxy object, loading the real object on demand. Protection Proxy.
The Proxy. Image class is used to access a remote method. The example creates first an interface against which the pattern creates the classes. This interface contains only one method to display the image, called display. Image(), that has to be coded by all classes implementing it. The proxy class Proxy. Image is running on another system than the real image class itself and can represent the real image Real. Image over there.
The image information is accessed from the disk. Using the proxy pattern, the code of the Proxy.
Image avoids multiple loading of the image, accessing it from the other system in a memory- saving manner. It should be noted, however, that the lazy loading demonstrated in this example is not part of the proxy pattern, but is merely an advantage made possible by the use of the proxy.
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Instructions on how to enable your browser (Internet Explorer, Fire Fox, Opera, Netscape, or Safari) to use a proxy server to hide your IP address. We offer a free web proxy to easily access blocked websites and surf the web anonymously. If you want to encrypt your whole internet connection and enjoy all. A proxy server is a computer that offers a computer network service to allow clients to make indirect network connections to other network services. Proxy definition, the agency, function, or power of a person authorized to act as the deputy or substitute for another.
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