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OGSA-DAI Architecture + Extensibility

OGSA-DAI Architecture + Extensibility. OGSA-DAI Tutorial GGF17, Tokyo. Outline. “Let us out” Exposing data to clients – the server’s perspective “Let us in” Getting to the data – the client’s perspective “More, more more…” Extending OGSA-DAI. Files. Data resources. Relational MySQL

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OGSA-DAI Architecture + Extensibility

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  1. OGSA-DAI Architecture + Extensibility OGSA-DAI Tutorial GGF17, Tokyo

  2. Outline • “Let us out” • Exposing data to clients – the server’s perspective • “Let us in” • Getting to the data – the client’s perspective • “More, more more…” • Extending OGSA-DAI http://www.ogsadai.org.uk/

  3. Files Data resources • Relational • MySQL • Microsoft SQL Server • Oracle • IBM DB2 • PostGres • HSQL • XML • eXist • Xindice • File system • SwissPROT • OMIM • Text • Binary Relational XMLDB http://www.ogsadai.org.uk/

  4. Files Data resource accessors • Interfaces between data resources and OGSA-DAI • Relational • JDBC drivers • java.sql.* • XML • XMLDB API and compliant drivers • org.xmldb.api.* • File system • Java file and directory utilities • java.io.* • OGSA-DAI extensibility point Data Resource Accessor Relational Data Resource Accessor XMLDB Data Resource Accessor http://www.ogsadai.org.uk/

  5. Files Data service resources SQLOne Data Service Resource Data Resource Accessor Relational XMLOne Data Resource Accessor Data Service Resource XMLDB FilesOne Data Service Resource Data Resource Accessor http://www.ogsadai.org.uk/

  6. Data service resources • OGSA-DAI’s core functionality • Manages • Access to a data resource via a data resource accessor • Execution of data-related activities • Data caching and streaming of data to and from clients • Creation, access and termination of sessions • Exposes data service resource properties • Information about a data resource • Information about supported activities • Information about current requests http://www.ogsadai.org.uk/

  7. Perform Document SQLOne SQL Query SQL Query Data Service Resource Response Document ResultSet Results Requests and responses Data Resource Accessor Relational http://www.ogsadai.org.uk/

  8. Requests and responses • Request • A connected collection of activities that the data resource should execute • XML perform document submitted by a client • Activity • An individual data-related operation • 0 or more inputs and 0 or more outputs • Response • Status of execution of a request possibly with result data • XML response document returned to a client • OGSA-DAI engine • Parses requests, executes activities, builds responses http://www.ogsadai.org.uk/

  9. Activities • Relational • SQL query, update, stored procedure, bulk load, extract logical and physical schema • Convert ResultSet to WebRowSet, ResultSet to CSV, ResultSet to bytes, relational database schema to XML • Project ResultSet or WebRowSet onto a column • Extract bytes from ResultSet • XMLDB • Resource and collection management, XPath, XQuery, XUpdate, bulk load • Files • List directory, create, read, write and update files • Index files, search indexed files http://www.ogsadai.org.uk/

  10. Activities • Transformation and Compression • GZIP compression, ZIP archive • XSLT • Project CSV data onto a column • Distribute numerical data onto spaces • Create random sample of data • Delivery • From and to URLs, files, GridFTP, remote data service resources, SOAP attachments • To servlets, SMTP, resource properties • Factory • Create and destroy persistent and transient data service resources • Relational multi-resources • Bag and resilient queries • OGSA-DAI extensibility point http://www.ogsadai.org.uk/

  11. Files Data services SQLOne Data Service Resource Data Resource Accessor Relational XMLOne Data Resource Accessor Data Service Resource Data Service XMLDB FilesOne Data Service Resource Data Resource Accessor http://www.ogsadai.org.uk/

  12. Data services • Web services • Expose 0..N data service resources to the outside world • Two flavours • OGSA-DAI WSRF services • Compliant with the Web Services Resource Framework • Implemented using Globus Toolkit (4.0+) • OGSA-DAI WSI services • Compliant with vanilla WSDL • Implemented using Apache Axis (1.2.1 or 1.2RC3) • Service-level operations • GetVersion – which version of OGSA-DAI is running • ListResources – which data service resources does a service expose • Deploy / Undeploy • Expose / withdraw data service resources to / from the outside world http://www.ogsadai.org.uk/

  13. Data services • Data service resource-specific operations • Perform • Receive requests for a data service resource and return responses • GetFully / GetNBlocks / GetBlock • Stream data from a data service resource • PutFully / PutBlock • Stream data to a data service resource • GetResourceProperty / GetMultipleResourceProperties / QueryResourceProperties • Expose information about the data service resource state http://www.ogsadai.org.uk/

  14. Clients Perform Document Perform Document SQLOne SQL Query SQL Query Data Service Resource Data Resource Accessor Data Service Relational Client ResultSet Results Response Document Response Document Authorization points http://www.ogsadai.org.uk/

  15. Identifying a data service resource http://host:port/services/wsrf/DataService SQLOne Request SQLOne Data Service Resource Data Service Client Request http://host:port/services/axis/DataService/DAISQLOne http://www.ogsadai.org.uk/

  16. Clients and the client toolkit • Clients interact with data services via SOAP over HTTP • Deduce service interface from service WSDL description • Construct SOAP request to invoke operation • Parse SOAP response from service • Resource identification scheme must be assumed from WSDL namespace • OGSA-DAI client toolkit: • Construct and submit requests in Java not XML • Toolkit handles SOAP request construction and response parsing • Renders OGSA-DAI service types transparent • Java abstractions of • Data services • Data service resource IDs and session IDs • Requests and responses • Activities http://www.ogsadai.org.uk/

  17. SQL Query SQL Query Multi Results Results x M SQL Query Results SQL Query Results SQL Query Results SQL Query Results SQL Query Results SQL Query Results Relational multi-resources MultiOne Data Service Multiple Data Resource Accessor Multi Resource Data Service Data Service Data Service Resource Data Service Resource Relational Relational http://www.ogsadai.org.uk/

  18. Create Resource InstanceOne InstanceOne Instance Data Resource Accessor Instance Resource InstanceOne Factory resources FactoryOne Data Service Factory Data Resource Accessor Factory Resource Resource http://www.ogsadai.org.uk/

  19. Extending OGSA-DAI • Data resource accessors • Use your own data resources within OGSA-DAI • Expose local or remote data resources • Expose virtual resources created by aggregation or integration • Resource management • Creation and destruction of persistent and transient data service resources • Another type of data resource accessor • Activities • Use your own activities that can be executed by a data service resource • Can be resource specific e.g query or update • Or generic e.g. transformation, compression, delivery, resource management, monitoring • Authorization • Resource access • Activity execution • In application-specific ways http://www.ogsadai.org.uk/

  20. Summary • The OGSA-DAI layer cake • Data • Data resource accessors • Data service resources • Data services • Clients • Extending OGSA-DAI • Data resource accessors • Activities • Authorization http://www.ogsadai.org.uk/

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