ActiveXML peer Anca Ghitescu R

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ActiveXML peerAnca GhitescuRD Engineer -
GEMO
19/05/2008
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Agenda

• ActiveXML peer
• ActiveXML documents
• Architecture
• Activation chain of execution
• ActiveXML materializers
• ActiveXML services
• Continuous service calls
• AXML syntax
• Software components

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ActiveXML documents
- When activated, these documents are
enriched with data coming as results of service
calls

• - XML documents with
• embedded calls to web services
• sc service call

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ActiveXML example

• Before activation
• ltexample xmlnsaxml"http//futurs.inria.fr/gemo/a
  xml/"gt
• ltaxmlsc axmlid"temperature"gt
• ltaxmlws-soap endpoint"http//webservices.daeh
  osting.com/services/TemperatureConversions.wso"gt
• ltCelciusToFahrenheitgtltnCelciusgt10lt/nCelciusgtlt
  /CelciusToFahrenheitgt
• lt/axmlws-soapgt
• lt/axmlscgt
• lt/examplegt
• After activation
• ltexample xmlnsaxml"http//futurs.inria.fr/gemo/a
  xml/"gt
• ltaxmlsc axmlid"temperature"gt
• ...
• lt/axmlscgt
• ltmCelciusToFahrenheitResult gt50lt/mCelciusToFahr
  enheitResultgt
• lt/examplegt

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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

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Activation Chain of execution

• Activate the document version.xml_at_peer1 and get
  the data from peer2

example
Web Interface
3. use InOut Materializer
sc id"version" http//peer2/services/Version
Materializers
5. get response
2. call activate?
getVersion
4. call service
Client
Client
version.xml_at_peer1 before activation
Materialization Service
Server
Server
example
Version
1. load document
version.xml
6. append data
sc
result
peer2
peer1
get Version
version 1.3
version.xml_at_peer1 after activation
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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

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ActiveXML Materializers

• Calling different services and processing the
  results
• They might need to be specified into axml
  documents depending on called services
• DefaultOutOnlyMaterializer / DefaultOutInMateriali
  zer
• 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

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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

example
sc GenericQueryService MaterializerForContinuous
Query
result1
result2
continuousQuery
param id"stream"
declaration
sc StreamService
data1
data2
let a ltparam id"stream"gt for r in a/
return r
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AXML example continuous query

• ltexample xmlnsaxml"http//futurs.inria.fr/gemo/a
  xml/"gt
• ltaxmlsc axmlid"continuousFILTER"gt
• ltaxmlreturn materializer
• "fr.inria.gemo.axml.model.sc.materialization.M
  aterializerForContinuousQUERY"gt
• ltaxmlappend/gt
• lt/axmlreturngt
• ltaxmlws-soap endpoint"http//localhost6
  969/MyPeer/services/GenericQueryService"gt
• ltqcontinuousQuery xmlnsq"http//fut
  urs.inria.fr/gemo/axml/service/Query"gt
• ltqdeclarationgt
• let book ltqparam name"book"/gt
• for b in book/ return
  if(xsinteger(b/year) gt 2003) then b else ()?
• lt/qdeclarationgt
• ltqparam name"book"gt
  
• ltaxmlsc axmlid"bookStreamer
  "gt
• ...
• lt/axmlscgt
• ltSTREAM_DATA/gt
• lt/qparamgt
• lt/qcontinuousQuerygt

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Generic Query Service

• Execute a query
• Execute a continuous query (stream parameters)?
• Apply a public query defined in another document
  (as a function)?

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Optimax Service

• Optimizer for AXML documents
• Rewrites the documents with the help of Algebra
  operators (Send, Receive, NewNode)?
• Rewriting based on strategy and statistics

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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

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Software Components

• Web server Tomcat 5.5
• Axis2 Web service engine
• Repository eXist XML database
• ActiveXML engine
• Web interface
• GWT (Google Web Toolkit)?
• XForms
• SOAP Alerter

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Miscellaneous

• www.activexml.net
• Documentation
• Regression Tests
• SVN repository http//forge.objectweb.org/project
  s/activexml/

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Merci!