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The <i>Proxy</i> pattern is used in software development to create a placeholder for an object. The Proxies provide an interface to another object is not actually created until the information that the such as a network connection, a large object holds is required. This extra layer of abstraction saves time when in memory, a program must access a database file, or a disk for the information.<br /><br />If the information some other resource that is never required, the database/disk will never be queried and the system will run more efficiently with less slowdowns for unnecessary materializationsexpensive or impossible to duplicate.

When a request is made "<i>Any operations performed on the proxies are forwarded to a Proxy, the real original object is then instantiated. From then onOnce all instances of the proxy are out of scope, any further requests are made to the real complex object's memory may be deallocated.</i>" - <b>Proxy Pattern, Wikipedia. org</b><br />There are four common situations where a Proxy pattern is required:

This Sample code is from a Python Remote Method Invocation program. It is copyrighted by <b>Irmen de Jong</b> and licensed by <b>[http://www.google.com/codesearch?hl=en&q=show:dgvZt53GNuE:9VmFCU8eSwo:nSqKvMM2F_M&sa=N&cd=13&ct=rl&cs_p=http://gentoo.osuosl.org/distfiles/Pyro-3.4.tar.gz&cs_f=Pyro-3.4/Pyro/EventService/Clients.py MIT]</b>. The code in this example is located in the <i>Clients.py</i> file of the <b>Pyro</b> system. It allows a user to write a module containing a class to be accessed remotely. The class the user created is registered by the Pyro Name Server. The client creates proxies for the remote objects to be invoked when a call is made to the object. The Virtual Proxy pattern can be seen throughout this code file as highlighted:

This sample code is from the Apache Geronimo server runtime framework written in J2EE. It is copyrighted by <b>IBM</b> and licensed by <b>[http://www.google.com/codesearch?hl=en&q=show:x-Vlj2phf84:hfeVps_3TKA:KxOJN1EfkwE&sa=N&ct=rd&cs_p=http://archive.apache.org/dist/geronimo/1.0-M5/geronimo-1.0-M5-src.tar.gz&cs_f=geronimo-1.0-M5/LICENSE.txt Apache]</b>. The code in this example is located in the <i>GBeanCollectionReference.java</i> of the <b>Geronimo</b> framework. It allows a user to create their own J2EE 1.4 certified application server. It can deploy servlets, XML, and other web applications. The Virtual Proxy pattern can be seen throughout this code file as highlighted: