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Bccon use notes objects in memory and other useful
This document summarizes Frank van der Linden's presentation on using Notes objects in memory and other Java tips for XPages development. It discusses putting Notes documents in memory using DominoDocument wrappers, building JSON with built-in classes, using the MVC pattern with managed beans, Java date checks and utility classes, unit testing, and finally blocks. It also provides an overview of the presenter and includes links to his social media and website.
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Bccon use notes objects in memory and other useful
- 1. Use Notes objectsin memory and other useful Java tips for XPages development Frank van der Linden
- 2. Me • Java/XPages/Web/Dominodeveloper • Self employed at elstar IT • OpenNTF director • Speak at several national and international events • IBM Champion 2013 and 2014 • Live in the Netherlands • Work everywhere @flinden68 http://nl.linkedin.com/in/flinden68 flinden68@elstarit.nl http://www.elstarit.nl
- 3. Disclaimer All thecode 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 • Notesobjects 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 inmemory
- 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
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- 8. XPages Java docto the rescue
- 9. Put Notes documentin 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
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- 13. What about attachments • Get easy access to your attachments
- 14. What about attachments • No calculation of paths • Works both in XPinc and Web • Call the attachment URL
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- 16. Use build-in JSONclasses
- 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
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- 21. MVC for XPages • Separation of responsibility • Cleaner code • Easier to maintain • Model = documents • View = XPage • Controller = Java managed bean
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- 23. The requirements •Needs to be Serializable • At least one constructor without parameters • Needs to be registrated in 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 managedbeans • Do the calculation in the class • Use Expression Language to access properties • Minimize use of SSJS • Some examples
- 26. Java tips forXPages
- 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 TimeDifference horror • 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 EasyMock or Mockito, to simulate objects
- 32. Unit test forXPages • More and more Java code in XPages development • Write Unit test for better code • On OpenNTF Junit test for Xpages project (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://nl.linkedin.com/in/flinden68 http://www.elstarit.nl flinden68@elstarit.nl https://bitbucket.org/flinden68/bccon-java-demo/src
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