Proxy pattern: Difference between revisions

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Latest revision as of 02:52, 11 August 2025

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that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.

===What problems can the Proxy design pattern solve? ===
Source:<ref>{{cite web|title=The Proxy design pattern - Problem, Solution, and Applicability|url=http://w3sdesign.com/?gr=s07&ugr=proble|website=w3sDesign.com|access-date=2017-08-12}}</ref>===

* The access to an object should be controlled.

* Additional functionality should be provided when accessing an object.

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Define a separate <code>Proxy</code> object that

* can be used as a substitute for another object (<code>Subject</code>), and

* implements additional functionality to control the access to this subject.

This makes it possible to work through a <code>Proxy</code> object to perform additional functionality when accessing a subject. For example, tolike checkchecking the access rights of clients accessing a sensitive object.

To act as a substitute for a subject, a proxy must implement the <code>Subject</code> interface. Clients can't tell whether they work with a subject or its proxy.

Clients can't tell whether they work with a subject or its proxy.

See also the UML class and sequence diagram below.

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{{Commons category}}

* {{cite web |last1=Geary |first1=David |date=2002-02-22 |df=mdy |url=https://www.infoworld.com/article/2074068/take-control-with-the-proxy-design-pattern.html |title=Take control with the Proxy design pattern |work=[[JavaWorld]] |access-date=2020-07-20}}

* [httphttps://perfectjpattern.sourceforge.net/dp-proxy.html PerfectJPattern Open Source Project], Provides componentized implementation of the Proxy Pattern in Java

* {{webarchive |url=https://web.archive.org/web/20120311202925/http://www.netobjectives.com/PatternRepository/index.php?title=AdapterVersusProxyVersusFacadePatternComparison |title=Adapter vs. Proxy vs. Facade Pattern Comparison}}

* [https://sourcemaking.com/design_patterns/proxy Proxy Design Pattern]