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The Elk Project http://elk.itn.liu.se

The Elk Project http://elk.itn.liu.se. Claes Buckwalter Linköping University Sunday, January 23 2005 Print Media Academy Heidelberg. About the Elk Project. Idea presented at Drupa 2004 Development started in August 2004

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The Elk Project http://elk.itn.liu.se

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  1. The Elk Projecthttp://elk.itn.liu.se Claes BuckwalterLinköping UniversitySunday, January 23 2005 Print Media Academy Heidelberg

  2. About the Elk Project • Idea presented at Drupa 2004 • Development started in August 2004 • Project goal:To design and implement an application framework in Java that provides the basic services needed by JDF-enabled software.

  3. The Elk Project • Consists of two separate parts • The Elk Framework • Mainly specifies interfaces and abstract classes • The Reference Implementation • Concrete implementations of the framework • A web application

  4. The Elk Framework • Package name: org.cip4.elk • Interfaces and abstract classes that specify the services needed by a device: • Incoming/outgoing message dispatchers • JMF processors/handlers • JMF servlet • Queue • Process • Subscription manager • Factory for JDF elements

  5. Overview of Important Classes org.cip4.elk.device <<interface>>IncomingJMFDispatcher <<interface>>OutgoingJMFDispatcher org.cip4.elk dispatches JMF to JDFElementFactory <<interface>>JMFProcessor <<interface>>SubscriptionManager org.cip4.elk.device org.cip4.elk.queue <<interface>>Process <<interface>>Queue

  6. Reference Implementation • Package name: org.cip4.elk.impl • Concrete implementations of the classes defined in the Elk Framework: • Dispatching JMF servlet • Synchronous message dispatchers • 10 JMF processors • Memory-based subscription manager • Memory-based queue • Approval process • MIME package reader • Tool for accessing URLs (http, https, file, ftp, WebDAV)

  7. Approval Device KnownMessagesJMFProcessor QueueStatusJMFProcessor HoldQueueJMFProcessor DispatchingJMFServlet SubscribingIncomingJMFDispatcher ResumeQueueJMFProcessor MemoryQueue CloseQueueJMFProcessor OpenQueueJMFProcessor ElkStartupServlet SubmitQueueEntryJMFProcessor ApprovalProcess DeviceConfig StatusJMFProcessor FileUtil EventsJMFProcessor StopPersChannelJMFProcessor SynchronousHttpOutgoingJMFDispatcher SimpleSubscriptionManager

  8. Test Tools • Command-line client for sending JMF, JDF and MIME • Proxy support • HTTPS support • Servlet for testing MIME package clientshttp://elk.itn.liu.se/elk/mime

  9. To Be Done… • The Elk Framework • Refactor JMFProcessor into 3 interfaces • SignalProcessor • QueryProcessor • CommandProcessor • More inter-device events • Add/refactor as reference implementation evolves • Reference implementation • Full compliance to Base ICS Level 3 • Add support for all (38) JMF message types • Asynchronous messaging • Full subscription/persistent channel support • Receive and submit MIME • Full queue support • A better process implementation Help wanted!

  10. Live Demo • http://elk.itn.liu.se/elk/jmfThe reference implementation web application. Send a KnownMessages Query to it to find out what it can do. • http://elk.itn.liu.se/elk/mimeFor testing clients that send MIME packages. Send a MIME packages to it.

  11. More Information • The project web site: http://elk.itn.liu.se • Binaries • Source code • Documentation • Javadoc • Developer's tutorial • Design, UML

  12. Thank you for listening! Claes Buckwalterclabu@itn.liu.sehttp://www.itn.liu.se/~clabu

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