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{{Short description|Programming paradigm based on conceptual understanding of objects}}
{{Use mdy dates|date=January 2019}}
{{Use American English|date=January 2019}}
'''Role-oriented programming''' as a form of [[programming language|computer programming]] aims at expressing things in terms that are analogous to human [[concept]]ual understanding of the [[world]]. This should make programs easier to understand and maintain.{{citation needed|date= August 2016}}
Much research has been carried out in the field of role-oriented programming. In the older literature and in the field of databases, it seems that there has been little consideration for the context in which roles interplay with each other. Such a context is being established in newer role- and aspect-oriented programming languages such as PyMeleon and Object Teams.▼
The main idea of role-oriented programming is that humans think in terms of [[role]]s. This claim is often backed up by examples of [[social relations]]. For example, a student attending a class and the same student at a party are the same person, yet that person plays two different roles. In particular, the interactions of this person with the outside world depend on his current role. The roles typically share features, e.g., the intrinsic properties of being a person. This sharing of properties is often handled by the [[Delegation_(programming)|delegation]] mechanism.
▲
Authors of role literature▼
| last1 = Carpenter
| first1 = Tom
| title = Microsoft Windows Server Administration Essentials
| url = https://books.google.com/books?id=6_mmL45Zw0IC
| series = Sybex Serious Skills
| date = July 18, 2011
| ___location = Indianapolis
| publisher = John Wiley & Sons
| publication-date = 2011
| page = 9
| isbn = 9781118148693
| access-date = 2018-03-07
| quote = [...] a server role is a set of software programs (services) that enable a server to perform specific functions for users or computers on the network.}}</ref>
Many{{quantify|date=March 2018}} researchers have argued the advantages of roles in [[computer model|modeling]] and implementation. Roles allow objects to evolve over time, they enable independent and [[Concurrency (computer science)|concurrently]] existing views (interfaces) of the object, explicating the different contexts of the object, and [[separation of concerns | separating concerns]]. Generally roles are a natural element of human daily concept-forming. Roles in programming languages enable objects to have changing interfaces, as we see in [[real life]] - things change over time, are used differently in different contexts, etc.
▲==Authors of role literature==
* [http://www.informatik.uni-trier.de/~ley/db/indices/a-tree/p/Pernici%3ABarbara.html Barbara Pernici]
* [http://www.mip.sdu.dk/people/Staff/bbk.html Bent Bruun Kristensen]<ref>{{cite web |url=http://www.sigmod.org/dblp/db/indices/a-tree/k/Kristensen%3ABent_Bruun.html |url-status=dead |archive-url=https://web.archive.org/web/20070927210129/http://www.sigmod.org/dblp/db/indices/a-tree/k/Kristensen:Bent_Bruun.html |archive-date=September 27, 2007 |title=DBLP: Bent Bruun Kristensen}}</ref>
* [https://existentialprogramming.blogspot.com/search/label/roles Bruce Wallace]
* [[Charles Bachman]]<ref>{{cite web |url=http://www.computerhistory.org/events/lectures/bachman_04162002/bachman.shtml |title=Computer History Museum - Lectures - Charles W. (Charlie) Bachman |access-date=2013-01-03 |url-status=dead |archive-url=https://web.archive.org/web/20130103023948/http://www.computerhistory.org/events/lectures/bachman_04162002/bachman.shtml |archive-date=2013-01-03 }}</ref>
* [http://www.kbs.uni-hannover.de/~steimann/ Friedrich Steimann]
* [http://www.informatik.uni-trier.de/~ley/db/indices/a-tree/g/Gottlob%3AGeorg.html Georg Gottlob]
* [https://www.itu.dk/people/kbilsted/ Kasper B. Graversen]
* [https://www.itu.dk/people/kasper/ Kasper Østerbye]
* [http://www.informatik.uni-trier.de/~ley/db/indices/a-tree/h/Herrmann%3AStephan.html Stephan Herrmann]
* [[Trygve Reenskaug]]<ref>{{cite web |url=http://www.informatik.uni-trier.de/~ley/db/indices/a-tree/r/Reenskaug%3ATrygve.html |title = dblp: Trygve Reenskaug}}</ref>
* [https://wwwpub.zih.tu-dresden.de/~s4560758/ Thomas Kühn]
==Programming languages with explicit support for roles==
* [[Cameleon_(programming_language)|Cameleon]]
* [https://www.eclipse.org/epsilon/ EpsilonJ]
* [[JavaScript#Delegative|JavaScript Delegation - Functions as Roles (Traits and Mixins)]]
* [https://www.eclipse.org/objectteams Object Teams]
* [[Moose (Perl)#Roles|Perl (Moose)]]
* [[Raku (programming language)#Roles|Raku]]
* [http://portal.acm.org/citation.cfm?id=1141277.1141606 powerJava]
* [https://github.com/max-leuthaeuser/SCROLL SCala ROLes Language]
==See also==
* [[Aspect-oriented programming]]
* [[Data, context and interaction]]
* [[Object Oriented Role Analysis Method]]
* [[Object-role modeling]]
* [[Subject (programming)]]
* [[Subject-oriented programming]]
* [[Traits (computer science)]]
==References==
{{reflist|30em}}
==External links==
* [https://web.archive.org/web/20060910101027/http://ftp.ccs.neu.edu/pub/people/lieber/appcs.pdf Adaptive Plug-and-Play Components for Evolutionary Software Development], by Mira Mezini and Karl Lieberherr
* [http://www.iit.edu/~concur/asc/cassservices.html Context Aspect Sensitive Services]
* [https://www.itu.dk/people/kbilsted/graversen06thesis.pdf Overview and taxonomy of Role languages]
* [https://doi.ieeecomputersociety.org/10.1109/COOPIS.1999.792181 ROPE: Role Oriented Programming Environment for Multiagent Systems]
{{Programming paradigms navbox}}
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[[Category:Object-based programming languages]]
[[Category:Programming paradigms]]
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