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GWTcon 2015 - Beyond GWT 3.0 Panic
This document discusses experimenting with architecting web applications without using GWT-User. It recommends removing GWT-User from dependencies, avoiding JSNI and widgets in favor of JsInterop and Polymer, not using IDE plugins, and avoiding GWT RPC. It demonstrates this approach by developing WUnit, a unit testing framework for the game Warhammer. WUnit is implemented with a Java engine and model, and a frontend using GWT, Polymer, and JsInterop. This allows the code to be reused across platforms like web, Android, and iOS. The document discusses challenges encountered and open issues, and calls on the GWT steering committee to create more modular libraries to support this approach.
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GWTcon 2015 - Beyond GWT 3.0 Panic
- 1. (ARCHITECTING WEB APPLICATIONSWITHOUT GWT-USER) Beyond GWT 3.0 Panic
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- 3. GWT and ServiceMixproject: 270K LoC, 5500 classes, more than 200 Maven modules
- 4. GWT MEET-UP 2015 “GWT2.8 and Beyond”, by Ray Cromwell, Goktug Gokdogan
- 7. OK… WHAT DOWE DO NOW?
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- 10. No, I wantto reuse Java in Web Applications, mobile platforms and off- course in the Java Backend STOP USING GWT?
- 11. 1st. remove GWT-Userfrom dependencies 2nd. don’t use JSNI, use JsInterop 3rd. don’t use Widgets, use Polymer 4th. don’t use IDE plugins* 5th. don’t use GWT RPC Experiments Checklist:
- 12. 1st. remove GWT-Userfrom dependencies 2nd. don’t use JSNI, use JsInterop 3rd. don’t use Widgets, use Polymer 4th. don’t use IDE plugins* 5th. don’t use GWT RPC LET’S PUT IT INTO PRACTICE Experiments Checklist:
- 13. INTRODUCING WUnit an exampleapplication to test our survival strategy
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- 15. WUNIT IS AUNIT TEST FRAMEWORK FOR… INTRODUCING WUNIT
- 16. WUNIT IS AUNIT TEST FRAMEWORK FOR… INTRODUCING WUNIT …WARHAMMER, THE GAME
- 17. Testing which “Unit”is the best is really slow
- 18. Testing needs throwinga lot of dice
- 19. Using the “Assault Dice”app… …solves only part of the problem
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- 22. MANUAL DICE APP WUNIT 0 12,525 37,5 50 BENCHMARK (Minutes to test two units)
- 23. AT FIRST WUNITIS BORN WITH THIS ARCHITECTURE CONSOLE ENGINE MODEL POJOJavaSystem.out
- 24. THE VALUE OFUSING JAVA TO IMPLEMENT THE GAME LOGIC ENGINE Java This code is so much complex (Warhammer rules are so) that I wouldn’t attempt to write it without a full OOP language with solid development tools
- 25. THE VALUE OFUSING JAVA TO IMPLEMENT THE GAME LOGIC ENGINE Java This code is so much complex (Warhammer rules are so) that I wouldn’t attempt to write it without a full OOP language with solid development tools
- 26. THE VALUE OFUSING JAVA TO IMPLEMENT THE GAME LOGIC ENGINE Java This code is so much complex (Warhammer rules are so) that I wouldn’t attempt to write it without a full OOP language with solid development tools
- 27. THE VALUE OFUSING JAVA TO IMPLEMENT THE GAME LOGIC ENGINE Java This code is so much complex (Warhammer rules are so) that I wouldn’t attempt to write it without a full OOP language with solid development tools
- 28. WUnit’s Engine isimplemented in Java Developed with strong TDD (coverage is about 93.6%) REUSE - REUSE - REUSE
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- 30. …AND THEN IWANTED TO TO BUILD AN USER INTERFACE FOR WUNIT: HOW DID I DID IT? (Singular not available)
- 31. HOW TO USEGWT AND NOT GWT-USER (Experiments made with WUnit prototype)
- 32. ARCHITECTING WEB APPLICATIONSFOR REUSE VIEW INPUT PRESENTER ENGINE MODEL VIEW OUTPUT written with POJO written in (pure) Java written in GWT/JS written in Polymer Note: Engine and Model are compiled to Javascript and run on the browser thanks to javaemul !
- 33. REMOVE GWT-USER FROMDEPENDENCIES 1st
- 34. …but it comesthe first failure! JsInterop annotations and EntryPoint interface are inside GWT-user. REMOVE GWT-USER FROM DEPENDENCIES 1st
- 35. …but it comesthe first failure! JsInterop annotations and EntryPoint interface are inside GWT-user. Then, just avoid using anything else from GWT-user… REMOVE GWT-USER FROM DEPENDENCIES 1st
- 36. …and avoid inheriting“User” module in your .gwt.xml
- 37. -- TO GWTSTEERING COMMITTEE -- please create an independent library with EntryPoint and JsInterop interfaces so we can remove GWT-User from dependencies
- 38. Polymer is cool! Writethe widgets in javascript DON'T USE WIDGETS, USE POLYMER 2nd
- 42. …displays as atable’s row on the browser The custom HTML element…
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- 48. @JsType USE JsInterop 3rd * Note:this WUnit prototype has used the OLD JsInterop annotations
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- 50. LINK FROM GWTTO HOST PAGE
- 51. LINK FROM GWTTO HOST PAGE Fail! I had to use JSNI (but it is limited to invoking query selector from Java, and it can be rewritten with the new JsInterop)
- 52. OUTPUT FROM JAVA TOPOLYMER ELEMENTS VIEW OUTPUT Polymer
- 53. OUTPUT FROM JAVA TOPOLYMER ELEMENTS VIEW OUTPUT Polymer
- 54. INPUT FROM POLYMER ELEMENTS TOJAVA Polymer VIEW INPUT
- 55. INPUT FROM POLYMER ELEMENTS TOJAVA Polymer VIEW INPUT
- 56. DON'T USE IDEPLUGINS 4th
- 57. Unfortunately this solutiondoes not works standalone… I've hacked extensively the CodeServer *
- 58. Unfortunately this solutiondoes not works standalone… I've hacked extensively the CodeServer HACKS-HACKS-HACKS *
- 59. <add-linker name="sso" /> FOCUS:SSO LINKER
- 60. <add-linker name="sso" /> FOCUS:SSO LINKER
- 61. -- TO GWTSTEERING COMMITTEE -- please make Code Server more modular and reusable so we can use it this approach without hacks
- 62. This problem isnot solved yet (WUnit don't uses client-server communication) Work in progress It would be possible to implement a clean approach if GWT was supporting GSON or if the javaemul was supporting (a more rich subset of) Java Reflection DON'T USE GWT RPC 5th
- 63. -- TO GWTSTEERING COMMITTEE -- please create an independent and modular library with the javaemul, so it can be extended in a clean way
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- 65. How much GWT-Userhave we used in WUnit?
- 66. How much GWT-Userhave we used in WUnit? Instrument for coverage
- 67. How much GWT-Userhave we used in WUnit? Compile, including gwt:compile
- 68. How much GWT-Userhave we used in WUnit? Execute JettyEmbeddedServer (including Code Server)
- 69. How much GWT-Userhave we used in WUnit? * Open and run the app (to trigger Code Server compilation)
- 70. How much GWT-Userhave we used in WUnit? Generate coverage report
- 71. COVERAGE REPORT WUNIT (GWTCompilation and Code Server execution)
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- 75. Maven archetype orTemplate for this approach https://github.com/codejuicer/gwt-slimmize (release after some clean up and official gwt 2.8.0)
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