JSON Rules Language

JSON Rules Language Adrian Giurca

Goals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Main Requirements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Short Roadmap (1) Adrian Giurca and Emilian Pascalau. JSON Rules . In G. J. Nalepa and J. Baumeister (Eds.) Proceedings of 4th Knowledge Engineering and Software Engineering , KESE 2008 , collocated with KI 2008 , September 23, 2008, Kaiserlautern, Germany, CEUR vol 425 . (2) JSON Rules on Web Technologies Wiki (3) Emilian Pascalau, Adrian Giurca. Towards enabling SaaS for Business Rules . In Proceedings of The International Workshop on Intelligent Service Management ( ISM2009 ) , Lecture Notes in Informatics (LNI) Vol. P-147, pp. 207-222, collocated with Sabre 2009 , March 23-24, 2009, Leipzig, Germany. (4) See http://code.google.com/p/jsonrules (5) Emilian Pascalau, Adrian Giurca. A Lightweight Architecture of an ECA Rule Engine for Web Browsers. In Proceedings of 5th Knowledge Engineering and Software Engineering, KESE 2009 , collocated with KI 2009 . September 15, 2009, Paderborn, Germany. (6) Emilian Pascalau, Adrian Giurca. JSON Rules - The JavaScript Rule Engine . Software demo at Knowledge Engineering and Software Engineering, KESE 2009 , September 15, 2009, Paderborn, Germany. (7) Emilian Pascalau, Adrian Giurca. A Rule-Based Approach of Creating and Executing Mashups . 9th IFIP Conference on e-Business, e-Services, and e-Society, (I3E 2009). September 23-25, 2009, Nancy, France. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Event-Condition-Action (ECA) Rules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],{ "id":"rule101", "appliesTo": ["http://www.yahoo.com", "http://www.google.com/"], "eventExpression": { "eventType": "click", "eventTarget": "$X" }, "conditions": [ "$X:HTMLElement( class == 'note', $Y:firstChild)", "$Y.tagName == 'ul'" ], "actions": ["changeBackground($Y, 'blue')"] }

Event Expressions (1) ,[object Object],[object Object],[object Object]

Event Expressions (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Supported Event Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Logic of JSON Rule Event Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JSONTerm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JavaScript Boolean Conditions document.getElementById($id).nodeValue == 10 cart.totalAmount() > 150

XPath conditions { "variable":{"name":"$X"}, "xPath":"html//table//tr" } { "node":{"nodeValue":"JSON Rules"}, "xPath": /store/book[23]/title" } {"node":{ "nodeName":"tr", "firstChild":{ "nodeName":"td", "textContent":"T2:row1, cell 1" } }, "xPath": "html//table//tr" }

Descriptions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

More on Descriptions $N:Input( id=="postalCode", nodeValue==RegExp("/^{5}$/") ) (The pattern will bound the variable $N to the <input> element with id="postalCode" if the value of this element is a 5 digit number) ,[object Object]

Built-ins ,[object Object],[object Object],[object Object]

Rule Actions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

More on Rule Actions ,[object Object],PRR Standard Actions JSON Rules Example AssignExp change properties of an element document.getElementById('Item25').setAttribute('class', 'note') InvokeExp JavaScript function call alert(message) AssertExp insert a DOM node document.insertBefore(child, newChild) RetractExp remove a DOM node removeChild(child) UpdateExp update a DOM node replaceChild(newChild, oldChild)

Intelligent and adaptive Web user interfaces ,[object Object],[object Object],[object Object],Whenever the user clicks more than 3 times the same menu item add this item to the fast access menu items. { "id":"fast101", "appliesTo":["http://www.example.com""], "eventExpression":{ "eventType":"click", "eventTarget":"$X"}, "conditions": [ "$X:A( $Id:id, class = = 'menuItem')", "count("click",$Id) >= 3" ], "actions": ["fastMenu('add',$X)"] }

Implement Web Business Processes If the user loads financial news, offers him a three months subscription to Financial Times { "id":"fast101", "appliesTo":['http://www.example.com'"], "eventExpression":{"eventType":"DOMNodeInserted", "eventTarget":"$X"}, "conditions": [ "$Y:Div(id == 'currentFeedContent')", "$X:Div(?Y:relatedNode, $Z:childNodes)", "$C:Div(class='itemcontent')", "org.jsonrules.builtin.pred.member($C, $Z)", "$C.firstChild.nodeValue=='businessNews'" ], "actions": ["showAdd({"s":"ft","d":"3","p":"30"})"] }

JSON Rules in JSON Notation ,[object Object],[object Object],$X:HTMLElement( class == 'note', $Y:firstChild ) {"description":{ "type":"HTMLElement", "binding":{ "variable":{"name":"$X"}}, "constraints":[{ "propertyRestriction":{ "property":"class", "operator":"EQ", "value":"note" } }, {"propertyBinding":{ "property":"firstChild", "variable":{"name":"$Y"} } }] } }

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]

JSON Rules Language

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JSON Rules Language