1. 4d.1 Grid Computing, B. Wilkinson, 2005 Web Service Resource Framework Notes on “sticky note” assignment

2. 4d.2 Environment Uses the Java GT4 core, which can be installed directly on a PC. Needs: –jdk, Java software development kit –ant, open source tool for building java code

3. 4d.3 Sticky Note Service Represents a “sticky note as one might stick on the wall to give reminders. Resource property: a string containing the sticky note text Assignment due tomorrow

4. 4d.4 Sticky Note Operations Operations: –Write text into a note – “write-note” –Display the text of a note – “show-note” –Create a note (introduced in Exercise 2)

5. 4d.5 Exercise 1 Build sticky note service Deploy sticky note service. (Uses ant, not GT4 deploy command) Start GT4 container Execute a “show-note” client to use the show- note operation

6. 4d.6 Building/Deploying service Uses command: ant deploy where deploy is an xml build file.

7. 4d.7 Starting container $ bin/globus-start-container -nosec No Security -- Do not use GT 4 security mechanisms

8. 4d.8 Starting SOAP server at: http://192.168.123.100:8080/wsrf/services/ With the following services: [1]: http://192.168.123.100:8080/wsrf/services/InMemoryServiceGroupEntry [2]: http://192.168.123.100:8080/wsrf/services/TriggerFactoryService [3]: http://192.168.123.100:8080/wsrf/services/IndexFactoryService [4]: http://192.168.123.100:8080/wsrf/services/Version [5]: http://192.168.123.100:8080/wsrf/services/IndexService [6]: http://192.168.123.100:8080/wsrf/services/NotificationConsumerService [7]: http://192.168.123.100:8080/wsrf/services/DefaultTriggerServiceEntry [8]: http://192.168.123.100:8080/wsrf/services/TriggerServiceEntry [9]: http://192.168.123.100:8080/wsrf/services/IndexServiceEntry [10]: http://192.168.123.100:8080/wsrf/services/StickyNoteService [11]: http://192.168.123.100:8080/wsrf/services/AdminService [12]: http://192.168.123.100:8080/wsrf/services/DefaultIndexService [13]: http://192.168.123.100:8080/wsrf/services/DefaultIndexServiceEntry [14]: http://192.168.123.100:8080/wsrf/services/DefaultTriggerService [15]: http://192.168.123.100:8080/wsrf/services/ShutdownService [16]: http://192.168.123.100:8080/wsrf/services/ContainerRegistryService [17]: http://192.168.123.100:8080/wsrf/services/TriggerService [18]: http://192.168.123.100:8080/wsrf/services/gsi/AuthenticationService [19]: http://192.168.123.100:8080/wsrf/services/InMemoryServiceGroupFactory [20]: http://192.168.123.100:8080/wsrf/services/InMemoryServiceGroup [21]: http://192.168.123.100:8080/wsrf/services/ContainerRegistryEntryService [22]: http://192.168.123.100:8080/wsrf/services/SubscriptionManagerService All https if security used The deployed StickyNote Servicce

9. 4d.9 Executing show-note client Command: $GLOBUS_LOCATION/bin/show-note -s http://localhost:8080/wsrf/services/StickyNoteService Get: <ns1:message xmlns:ns1=http://tutorial.globus.org/stickynote >hello. This is the message on the sticky note

10. 4d.10 Executing write-note client $GLOBUS_LOCATION/bin/write-note -s http://localhost:8080/wsrf/services/StickyNoteService cheese Message written. This is the text to be written in sticky note

11. 4d.11 Exercise 2 Creating a Resource In this exercise, you are asked to modify files to introduce the “create note” operation. Files to modify: –sticky note service wsdl file, to include the create note operation –Sticky note service code, to include the create note operation –jndi deployment configuration file Also create a “create-note” client

12. 4d.12 Resource Home For managing resources. Must modify Resource Home from Exercise 1 so as to handle multiple resources. Done in deploy-jndi-conf.xml, by changing type of resource from “SingleNoteHome” to “ManyNoteHome” and associated details changed also.

13. 4d.13 Creating a new note $GLOBUS_LOCATION/bin/create-note -s http://localhost:8080/wsrf/services/StickyNoteService new note created... EPR written to file: note--1947556620.epr To see note: $GLOBUS_LOCATION/bin/show-note -e note--1947556620.epr <ns1:message xmlns:ns1=http://tutorial.globus.org/stickynote >hello. Endpoint Reference

14. 4d.14 Sample file containing Endpoint Reference <StickyNoteEndpoint xsi:type="ns1:EndpointReferenceType" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns1="http://schemas.xmlsoap.org/ws/2004/03/addressing"> <ns1:Address xsi:type="ns1:AttributedURI">http://192.168.1.100:8080/wsrf/ services/ StickyNoteService 25781085 Resource “key”

15. 4d.15 Sticky Note EPR StickyNote service EPR1 (service URI) Resource property Endpoint reference = EPR1 + resource “key” KeyResource “cheese” With multiple resources, each resource assigned a unique key identifying it

16. 4d.16 Exercise 3 Destroying Resources Add an operation “destroy” in service wsdl file Add “DestroyProvider operation provider” in wsdd file Test by creating Sticky note and using GT4 “wsrf-destroy” command.

17. 4d.17 Exercise 4 Adding a resource property A “lastModified” resource property is added which records the time that the sticky note message was last altered. Requires 4 files to be modified: –wsdl file –Service code –A file containing constants –Client code to test it

18. 4d.18 Exercise 5 Register with a Local Index Service GT 4 provided with an index service that can maintain a list of available services. Index service acts as local service registry. In Exercise 5, the service is registered with the local GT 4 index service.

19. 4d.19 Container Index service Multiple Sticky notes (resources with resource properties) Note, the exercises asks each person to start their own container

20. 4d.20 Details to use index service When resource created, “add” method of ResourceHome called. Need to override this method to include registering Resource with local index service. Need to modify ManyNoteHome.java

21. 4d.21 Querying Index Service wsrf-query Browse index service with the GT4 wsrf-query command: $GLOBUS_LOCATION/bin/wsrf-query -s http://localhost:8080/wsrf/services/DefaultIndexService '/*' which will list the services in an XML format.

22. 4d.22 Exercise 6 Register with a “Community” Index Service A remote index service is used, which holds all the services of the “virtual organization.” For our purposes, the community index service is at: http://beowulf.bear.uncw.edu:8080/wsrf/ services/DefaultIndexService

23. 4d.23 Local Index service Sticky note resources Community index service beowulf.bear.uncw.edu:8080 /wsrf/services/ DefaultIndexService StickyNote service client

24. 4d.24 Implementation Configure local index to register with community index service. All local information, including service resource properties, copied to community index service.

25. 4d.25 Implementation Modify the file: $GLOBUS_LOCATION/etc/globus_wsrf_mds_ index/hierarchy.xml to include the URL of the community index service ( parameter)

26. 4d.26 Querying Community Index Service Have Community Index Service running. Use wsrf-query command: $GLOBUS_LOCATION/bin/wsrf-query -s http://beowulf.bear.uncw.edu:8080/wsrf/ services/DefaultIndexService '/*' Should see contents of all local index services.

27. 4d.27 Local Index service Resources Service client Local Index service Resources Service client Student 1 Index entry Student 2 Index entry Student 1 container Only container and GT 4 core needed at each site to handle services. Student 2 container Community index service

28. 4d.28 Exercise 7 Lease-based Lifetime In lease-based model, resources must be kept alive by interested parties, otherwise resource dies. Set a lifetime for a service after which the service is destroyed. Clean up without having to use a destroy operation explicitly.

29. 4d.29 Termination Time Termination time exposed as a resource property. Can be set with GT4 wsrf-set-termination-time command. Example $GLOBUS_LOCATION/bin/wsrf-set-termination- time -e note--1234.epr 100 File containing EPR of resource (StickyNote) Termination time in seconds

30. 4d.30 Implementation Add subscribe operation to wsdl file. Add SubscribeProvider to wsdd file. Modify StickyNote.java Modify post-deploy.xml file See exercise write-up for more details

31. 4d.31 Exercise 8 Notifications Notifications, generally, are a means by which a client can be informed of changes that have occurred such as: –Changes to resource property values. –Methods added –Methods removed –Resources destroyed

32. 4d.32 In exercise 8, a second service, called watch- note, is used to display changes to the value of the StickyNote. Client StickyNote Service watch-note Different container StickyNote resource property Write note Notification that note changed

33. 4d.33 In Exercise 8, a second service, called watch- note, is used to inform the client of changes to the value of the StickyNote. Need the client to “subscribe” to receive notifications. Subscriptions are for a particular topic.

34. 4d.34 Exercise 9 Resource Discovery In this exercise, the local and community index services are searched for a particular StickyNote message. Since Resources properties are XML, can use “XPath” queries for searching and retrieval. Uses a “XPath” query (apparently embedded in a script called search-note in this exercise)

35. 4d.35 XML Path Language (XPath) W3C recommendation, 1999 A query language for search XML documents. Queries formed by identifying a route to the desired data. For details: http://www.w3.org/TR/xpath