Go! (programming language): Difference between revisions

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Revision as of 00:11, 22 November 2009

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'''Go!''' "is a [[multi-paradigmconcurrent programming language]], thatfirst publicly documented by [[Keith Clark]] and Francis McCabe in 2003<ref>Clark and McCabe, AAMAS'03, 2003</ref> and included as part of the Network Agents project at [[Sourceforge]]<ref>{{cite web|url=http://sourceforge.net/projects/networkagent/ |title=Network Agents |publisher=Sourceforge.net |date= |accessdate=2009-11-14}}</ref>. It is oriented to the needs of programming secure, production quality, agent based applications. It is [[multi-threadedmultithreaded]], [[strong typing|strongly typed]] and [[higherFunctional order functionprogramming|higher order]] (in the functional programming sense). It has relation, function, and action procedure definitions. Threads execute action procedures, calling functions and querying relations as need be. Threads in different agents communicate and coordinate using asynchronous messages. Threads within the same agent can also use shared dynamic relations acting as memory stores.

'''Go!''' is an obscure<ref>http://www.geek.com/articles/news/google-didnt-google-go-before-naming-their-programming-language-20091113/</ref> [[Agent-based model|agent-based]] programming language in the tradition of [[Logic programming|logic-based programming]] languages like [[Prolog]].<ref>{{cite web|last=Claburn |first=Thomas |url=http://www.informationweek.com/news/software/web_services/showArticle.jhtml?articleID=221601351 |title=Google 'Go' Name Brings Accusations Of 'Evil' |publisher=InformationWeek |date=2009-11-11 |accessdate=2009-11-14}}</ref> It was introduced in a 2003 paper by Francis McCabe and [[Keith Clark]].<ref>Clark and McCabe, AAMAS'03, 2003</ref>

Its nature as a multi-paradigm programming language, integrating logic, functional, object-oriented, and imperative programming styles,<ref name=informatica-survey>Bordini et al., Informatica, 2006</ref> is particularly applied to ontology-based modeling, as exploited for the [[Semantic Web]] in allowing a type system where [[Web Ontology Language|OWL]] classes can be represented in the type system.<ref>Clark and McCabe, Applied Intelligence, 2006</ref> The design of Go!, according to Bordini et al.'s survey,<ref name=informatica-survey /> also took into consideration critical issues such as security, transparency, and integrity, in regards to the adoption of logic programming technology. Agents in Go! contain both reactive and deliberative aspects, and coordinate using BDI structures,<ref>Fisher et al., Computational Intelligence, 2007</ref> and their style of expression has influenced the modeling of agent systems in [[Erlang (programming language)|Erlang]].<ref>Varela et al., Erlang Workshop'04</ref>

Upon the November 2009 release of Google's [[Go (programming language)|Go]] programming language (note lack of [[exclamation point]]) McCabe asked Google to change the name and accused the company of "steam-rollering over us".<ref>{{cite web|last=Claburn |first=Thomas |url=http://www.informationweek.com/news/software/web_services/showArticle.jhtml?articleID=221601351 |title=Google 'Go' Name Brings Accusations Of 'Evil' |publisher=InformationWeek |date=2009-11-11 |accessdate=2009-11-14}}</ref><ref>{{cite web|url=http://code.google.com/p/go/issues/detail?id=9 |title=Issue 9 - go - I have already used the name for *MY* programming language |publisher=code.google.com |date=2009-11-10 |accessdate=2009-11-14}}</ref>

Upon the November 2009 release of Google's programming language [[Go (programming language)|Go]] programming language (note lack of [[exclamation point]]) McCabehas, askedsince Googleits to2009 changerelease, been the namesubject andof accusedan theas companyyet ofunresolved "steam-rolleringnaming overcontroversy us"with Go! due to its very similar name.<ref>{{cite web|last=Claburn |first=Thomas |url=http://www.informationweek.com/news/software/web_services/showArticle.jhtml?articleID=221601351 |title=Google 'Go' Name Brings Accusations Of 'Evil' |publisher=InformationWeek |date=2009-11-11 |accessdate=2009-11-14}}</ref><ref>{{cite web|url=http://code.google.com/p/go/issues/detail?id=9 |title=Issue 9 - go - I have already used the name for *MY* programming language |publisher=code.google.com |date=2009-11-10 |accessdate=2009-11-14}}</ref>

== Design ==

== Communication model ==

Go! "is a [[multi-paradigm programming language]] that is oriented to the needs of programming secure, production quality, agent based applications. It is [[multi-threaded]], strongly typed and [[higher order function|higher order]] (in the functional programming sense). It has relation, function and action procedure definitions. Threads execute action procedures, calling functions and querying relations as need be. Threads in different agents

communicate and coordinate using asynchronous messages. Threads within the same agent can also use shared dynamic relations acting as

[[Linda (coordination language)|Linda]]-style [[tuple space|tuple stores]]."<ref>Clark and McCabe, AAMAS'03, 2003</ref>

Threads within a single Go! process, hence in the same agent, can also communicate by manipulating dynamic relation objects, comparable with [[Linda_(coordination_language)|Linda]] tuple stores,<ref name=informatica-survey /> used to coordinate their activities. A related combination of tuple-based shared stores and Semantics has been taken up as the communication mechanism in the approaches of the [http://www.tripcom.org/ TripCom.org]<ref>[http://www.tripcom.org/docs/del/D6.5v2.pdf TripCom]</ref> and [[SOA4All]]<ref>[http://www.soa4all.eu/file-upload.html?func=startdown&id=77 Soa4al.eu]</ref> projects.

The authors also propose that the language is suitable for representing [[ontology|ontologies]] due to its integration of [[logic programming|logic]], [[functional programming|functional]], [[object-oriented programming|object-oriented]] and [[imperative programming|imperative]] styles of programming.<ref>Clark and McCabe, Applied Intelligence, 2006</ref>

== Example ==

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The <code>::=</code> rule defines a new [[algebraic data type]], a [[data type]] with only data constructors.

The <code><˜</code> rule defines an interface type - it indicates what properties are characteristic of a <code>person</code> and also gives type constraints on these properties. It documents that <code>age</code> is a functional property with an integer value, that <code>lives</code> is a unary relation over strings, and that <code>dayOfBirth</code> is a functional property with a value that is an object of type <code>day</code>.

The <code>$=</code> type rule indicates that there is also a theory label, with the functor <code>"person</code>", for a theory that defines the characteristic properties of the <code>person</code> type - implements the <code>person</code> interface - in terms of four given parameters of types string, <code>day</code>, <code>Gender</code>, and string.

== Footnotes ==