ics user group dev day 2014 - IBM Champion Frank van der Linden demonstrate how to use notes objects in memory

1. Use Notes objects in memory and other useful Java tips for XPages development
Frank van der Linden

2. Me
•Java/XPages/Web/Domino developer
•Self employed at elstarIT
•OpenNTF director
•Speak at several national and international events
•IBM Champion 2013 and 2014
•Live in the Netherlands
•Work everywhere
@flinden68
http://www.elstarit.nl
http://nl.linkedin.com/in/flinden68
flinden68@elstarit.nl

3. Disclaimer
All the code and the demos in this session will use the Java Notes Objects which are part of the IBM/Lotus Notes product.
For a modern way of Java coding with Notes Objects please use the OpenNTF Domino API.
Or even better use OpenNTF essentials

4. Roadmap
•Notes objects in memory
•Use of JSON
•MVC/Managed beans
•Java tip for XPages
•Date checks
•Utility class
•Extending classes
•Unit test
•Finally
•Some bonus code

5. Notes objects in memory

6. Bad practice
•Notes objects are not serializable
•Will not recycled the Java way, it will keep a pointer to the C object
•Can cause out of memory

7. What is serialization

8. XPagesJava doc to the rescue

9. Put Notes document in memory
•Get Notesdocument
•Wrap Notesdocument into a DominoDocument

10. Get field values
•First check if document isRecycled
•Access field

11. On a XPageand more
•In a computed field
•In an edit box
•Update the backend document

12. Demo

13. What about attachments
•Get easy access to your attachments

14. What about attachments
•No calculation of paths
•Works both in XPincand Web
•Call the attachment URL

15. Demo

16. Use build-in JSON classes

17. JSON building classes
•Part of the Extensibility API, since 8.5.2
•Easy way to build JSON

18. JSON building classes
•No concatenation of Strings
•Faster
•Readable code

19. MVC

20. MVC

21. MVC for XPages
•Separation of responsibility
•Cleaner code
•Easier to maintain
•Model = documents
•View = XPage
•Controller = Java managed bean

22. Managed beans

23. The requirements
•Needs to be Serializable
•At least one constructor without parameters
•Needs to be registratedin the Faces-config.xml
•Properties are private
•And have Getters and Setters

24. Faces-config.xml syntax
•In package-explorer, under WebContentWEB-INF
•Name of the bean
•Full qualified class name
•Scope of the bean
•Optional, initialize properties

25. Use the managed beans
•Do the calculation in the class
•Use Expression Language to access properties
•Minimize use of SSJS
•Some examples

26. Java tips for XPages

27. Utility class
•All kind of methods
•Always available as static class
•I added some methods who were translated from SSJS

28. Date checks
•Remember the TimeDifferencehorror
•Java provide nice Date checks
•Like… Date.before(Date) or Date.after(Date)

29. Extending a class
•Extend a base class
•Use the methods of the base class

30. Extending a class
•Using the class
•In a XPage

31. Unit test
•Write code to test small portions of code, like methods
•Test if the code is doing what was intended
•Write better Java code
•Use Mock Framework, like EasyMockor Mockito, to simulate objects

32. Unit test for XPages
•More and more Java code in XPagesdevelopment
•Write Unit test for better code
•On OpenNTF Junit test for Xpagesproject (thanks Christian Guedemann)

33. And Finally
•Finally will always called, even after a catch
•Use it to recycle objects and close stream readers

34. Thank you
@flinden68
http://www.elstarit.nl
http://nl.linkedin.com/in/flinden68
flinden68@elstarit.nl
https://bitbucket.org/flinden68/bccon-java-demo/src

35. Bonus

36. Eventsource

37. Customizable Toolbar