1. 1 ActiveXML peer Anca Ghitescu R&D Engineer - GEMO 19/05/2008

2. 2 Agenda ActiveXML peer –ActiveXML documents –Architecture –Activation: chain of execution –ActiveXML materializers –ActiveXML services –Continuous service calls –AXML syntax –Software components

3. 3 ActiveXML documents - XML documents with embedded calls to web services *sc = service call - When activated, these documents are enriched with data coming as results of service calls

4. 4 ActiveXML example Before activation http://webservices.daehosting.com/services/TemperatureConversions.wso 10 After activation... 50

5. 5 Architecture of ActiveXML system Peer-to-peer network: a collection of ActiveXML peers A peer: client/server functionality As client: –Materializes service calls inside the document –Processes the results As server: axml specific web services –Materialization Service –Algebra Operators: Send, Receive, NewNode –Continuous Query Service Repository for AXML documents

6. 6 Activation: Chain of execution Activate the document version.xml@peer1 and get the data from peer2version.xml@peer1 example sc [id="version"; http://peer2/services/Version] getVersion version.xml@peer1version.xml@peer1 before activation example version 1.3 sc result get Version version.xml@peer1version.xml@peer1 after activation Client Server Materialization Service version.xml peer1 Client Server Version peer2 1. load document Web Interface 2. call activate‏ 3. use InOut Materializer Materializers 5. get response 4. call service 6. append data

7. 7 ActiveXML services Generic Query Service: applies a query over (continuous) data Streaming Service: streams data from a file stored in the database Continuous Service: calls a service continuously Optimax Service: rewrites axml documents based on rules Materialization Service: activates service calls inside axml documents Algebra Services: enable distributed data management –NewNodeOperator: installs axml data on remote peers –SendOperator: sends data (continuously)‏ –ReceiveOperator: receives data

8. 8 ActiveXML Materializers Calling different services and processing the results They might need to be specified into axml documents depending on called services –DefaultOutOnlyMaterializer / DefaultOutInMaterializer –MaterializerForContinuousQuery: calls GenericQueryService with parameters coming as results of other service calls (streams)‏ –MaterializerForContinuousSC: calls continuously a web service, each time a new parameter value arrives. –MaterializerForSC: eliminates the sc declaration from active parameters of a service call and calls the parent web service –MaterializerForRECEIVE / MaterializerForSEND

9. 9 Continuous service calls A service is called with parameters coming from a stream A stream might represent the results of another service call ReceiveOperator is called to stream back the results continuousQuery declaration sc [GenericQueryService; MaterializerForContinuousQuery] let $a:= for $r in $a/* return $r param [ id="stream" ] example sc [StreamService]data1data2 result1result2

10. 10 AXML example: continuous query <axml:return materializer= "fr.inria.gemo.axml.model.sc.materialization.MaterializerForContinuousQUERY"> let $book := for $b in $book/* return if(xs:integer($b/year) gt 2003) then $b else ()‏...

11. 11 Generic Query Service Execute a query Execute a continuous query (stream parameters)‏ Apply a public query defined in another document (as a function)‏

12. 12 Optimax Service Optimizer for AXML documents Rewrites the documents with the help of Algebra operators (Send, Receive, NewNode)‏ Rewriting based on strategy and statistics

13. 13 AXML syntax XML schemas –the syntax of axml documents –the definition of axml services –the communication headers for SOAP messages A sc is uniquely identified by (peerID, docID, nodeID)‏ Activation order –default: depth first –afterActivated, afterTerminated

14. 14 Web server: Tomcat 5.5 Axis2 Web service engine Repository: eXist XML database ActiveXML engine Web interface: –GWT (Google Web Toolkit)‏ –XForms SOAP Alerter Software Components

15. 15 Miscellaneous www.activexml.net Documentation Regression Tests SVN repository: http://forge.objectweb.org/projects/activexml/

16. 16 Merci!