ics user group dev day_2014 use notes objects in memory and other useful
0 likes585 views
The document provides guidance on using Java notes objects and best practices for XPages development, emphasizing the use of the OpenNTF Domino API and proper memory management. It covers various topics including MVC architecture, managed beans, JSON handling, and unit testing, aimed at promoting cleaner, more maintainable code. Key warnings about the serialization of notes objects and strategies for enhancing Java code efficiency are also discussed.
ics user group dev day_2014 use notes objects in memory and other useful
- 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
- 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 WebContentWEB-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