Boldly go where the Java programming language has never gone before
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Geert Bevin will present on technologies that extend the capabilities of the Java programming language. The presentation will cover Terracotta for clustering Java applications, RIFE continuations for pausing and resuming application state, Google Web Toolkit for developing web applications, and Google Android for developing mobile applications. By leveraging these technologies, Java applications can be developed that go beyond the standard Java platform.
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Boldly go where the Java programming language has never gone before
- 1. Boldly go where the Java programming language has never gone before Geert Bevin, Senior Developer, Terracotta Inc. TS-6213
- 2. Learn that you don't have to master new languages, tools and libraries to deliver applications that go much further than what the standard Java™ Platform provides 2008 JavaOneSM Conference | java.sun.com/javaone | 2
- 3. Who is Geert Bevin? senior developer at Terracotta (http://terracotta.org) founder of Uwyn (http://uwyn.com) founder of RIFE (http://rifers.org) contributor to many open-source projects: Terracotta, RIFE, OpenLaszlo, Gentoo Linux, Bla-bla List, Drone, ... Sun Java Champion creator of native Java language continuations biker and gamer 2008 JavaOneSM Conference | java.sun.com/javaone | 3
- 4. Agenda Java programming language != Java Virtual Machine (JVM™) != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 4
- 5. Key differences The Java programming language provides a syntax that allows the expression of application logic The JVM provides a runtime environment that abstracts away the operating system and hardware differences The Java platform bundles the Java programming language and the JVM with tools and libraries to provide a complete development and runtime solution 2008 JavaOneSM Conference | java.sun.com/javaone | 5
- 6. Different purposes The Java programming language is for development The JVM is for the execution of byte code The Java platform provides javac which compiles Java code to byte code 2008 JavaOneSM Conference | java.sun.com/javaone | 6
- 7. This is what you use every day … 2008 JavaOneSM Conference | java.sun.com/javaone | 7
- 8. … but it doesn’t have to be this way 2008 JavaOneSM Conference | java.sun.com/javaone | 8
- 9. You can change the language Another language can be used for development For example: • Groovy • JavaFX™ script • Scala • JRuby • Jython • ... 2008 JavaOneSM Conference | java.sun.com/javaone | 9
- 10. You can change the tooling Another tool can be used to create byte code For example: • ASM • AspectJ • BCEL • groovyc • ... 2008 JavaOneSM Conference | java.sun.com/javaone | 10
- 11. You can change the runtime Another runtime can be used to execute your logic For example: • GCJ • Web browser • Dalvik virtual machine •… 2008 JavaOneSM Conference | java.sun.com/javaone | 11
- 12. Today’s focus Any variation on this theme is possible Any of the layers can be replaced, extended or modified Today we'll focus on the Java programming language as the constant 2008 JavaOneSM Conference | java.sun.com/javaone | 12
- 13. Disclaimer The technologies in this presentation are being covered from a 'boldness' perspective. No judgment is made on whether they're a good solution nor how they compare to alternatives. This presentation is also not intended to be a comprehensive overview of their capabilities 2008 JavaOneSM Conference | java.sun.com/javaone | 13
- 14. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 14
- 15. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 15
- 16. What is Terracotta? Open Source Clustering for the Java Platform Scalability and Availability for the JVM 2008 JavaOneSM Conference | java.sun.com/javaone | 16
- 17. Terracotta Overview 2008 JavaOneSM Conference | java.sun.com/javaone | 17
- 18. Terracotta’s approach 'Regular' Clustering Different approach • Scale out is complex • Cluster the JVM software • Requires custom Java code • Eliminate need for custom code 2008 JavaOneSM Conference | java.sun.com/javaone | 18
- 19. Main features Heap level replication JVM coordination • Declarative • Distributed synchronized • No serialization • Distributed wait()/notify() • Fine grained / field Level • Fine grained locking • Only where resident Management Large virtual heaps • Runtime visibility • As large as available disk • Data introspection • Dynamic paging • Cluster monitoring 2008 JavaOneSM Conference | java.sun.com/javaone | 19
- 20. Terracotta Essential Features Animation 2008 JavaOneSM Conference | java.sun.com/javaone | 20
- 21. Terracotta Examples 2008 JavaOneSM Conference | java.sun.com/javaone | 21
- 22. Example of shared state Hello World 2008 JavaOneSM Conference | java.sun.com/javaone | 22
- 23. Hello World- tutorial/HelloWorld.java 2008 JavaOneSM Conference | java.sun.com/javaone | 23
- 24. Hello World - tc-config.xml 2008 JavaOneSM Conference | java.sun.com/javaone | 24
- 25. Demo Terracotta Shared State Hello World 2008 JavaOneSM Conference | java.sun.com/javaone | 25
- 26. Hello World - trying it out Start the server: $ start-tc-server.sh Start a client: $ dso-java.sh -Dtc.config=tc-config.xml tutorial.HelloWorld Output: Hello Thu Dec 13 17:46:58 CET 2007 After starting the 2nd client: Hello Thu Dec 13 17:46:58 CET 2007 Hello Thu Dec 13 17:47:06 CET 2007 The state is preserved in the server between executions 2008 JavaOneSM Conference | java.sun.com/javaone | 26
- 27. Example of coordination Enhanced Hello World using java.util.concurrent 2008 JavaOneSM Conference | java.sun.com/javaone | 27
- 28. Coordination - HelloWorldConcurrent.java 2008 JavaOneSM Conference | java.sun.com/javaone | 28
- 29. Coordination - tc-config-concurrent.xml 2008 JavaOneSM Conference | java.sun.com/javaone | 29
- 30. Demo Terracotta Coordination Enhanced Hello World 2008 JavaOneSM Conference | java.sun.com/javaone | 30
- 31. Coordination - trying it out Start the server: $ start-tc-server.sh Start a client: $ dso-java.sh -Dtc.config=tc-config-concurrent.xml -Dnodes=2 tutorial.HelloWorldConcurrent It just hangs there After starting the 2nd client: Hello Thu Dec 13 19:12:38 CET 2007 Hello Thu Dec 13 19:13:56 CET 2007 The cyclic barrier is clustered across JVMs 2008 JavaOneSM Conference | java.sun.com/javaone | 31
- 32. Terracotta’s Boldness 2008 JavaOneSM Conference | java.sun.com/javaone | 32
- 33. Terracotta's Boldness Plug into the JVM with a bootjar Translate threads to cluster nodes Modify getfield, putfield, monitorenter, monitorexit byte code instructions to work across the cluster Java Memory Model as a contract for accessing shared state and coordination across the cluster 2008 JavaOneSM Conference | java.sun.com/javaone | 33
- 34. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 34
- 35. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 35
- 36. What is RIFE? Full-stack component framework to quickly and consistently develop and maintain Java web applications 2008 JavaOneSM Conference | java.sun.com/javaone | 36
- 37. What are continuations? 2008 JavaOneSM Conference | java.sun.com/javaone | 37
- 38. … continuations are like Save Game 2008 JavaOneSM Conference | java.sun.com/javaone | 38
- 39. … Save Game can be performed at certain locations in the game (or anywhere, depending on the type of game) captures the progress and your possessions several saved games can exist at once 2008 JavaOneSM Conference | java.sun.com/javaone | 39
- 40. … but they are also like Load Game 2008 JavaOneSM Conference | java.sun.com/javaone | 40
- 41. … Load Game retrieve any saved game load the saved game restore the progress and your possessions resume exactly where you left off 2008 JavaOneSM Conference | java.sun.com/javaone | 41
- 42. … all we have to do is replace Game Application Saved Game Continuation Progress Location Possession State 2008 JavaOneSM Conference | java.sun.com/javaone | 42
- 43. … Pause can be performed at certain locations in the game captures the progress and your possessions the progress your possessions several saved games can exist at once saved games … Resume retrieve any saved games saved games load the saved game saved game restore the progress and your possessions resume the progress you leftpossessions exactly where your off 2008 JavaOneSM Conference | java.sun.com/javaone | 43
- 44. … Pause can be performed at certain locations in the game captures the progress and your possessions several saved games can exist at once … Resume retrieve any saved games load the saved game restore the progress and your possessions resume exactly where you left off 2008 JavaOneSM Conference | java.sun.com/javaone | 44
- 45. … Pause can be performed at certain locations in the application game captures the progress and the state the location your possessions several saved games can exist at once continuations … Resume retrieve any saved games continuation load the saved game continuation restore the progress and your possessions resume the location you left off exactly where the state 2008 JavaOneSM Conference | java.sun.com/javaone | 45
- 46. Concretely 2008 JavaOneSM Conference | java.sun.com/javaone | 46
- 47. Concretely : pseudo code 2008 JavaOneSM Conference | java.sun.com/javaone | 47
- 48. Concretely : pseudo code Program output is Let's call this backwards Context and location are stored in a variable Multiple continuations can be active at once 2008 JavaOneSM Conference | java.sun.com/javaone | 48
- 49. Continuations Example Number guessing game (as a web application) 2008 JavaOneSM Conference | java.sun.com/javaone | 49
- 50. Number Guessing - Game.java 2008 JavaOneSM Conference | java.sun.com/javaone | 50
- 51. Demo Continuations Number Guessing Game Running & Debugging 2008 JavaOneSM Conference | java.sun.com/javaone | 51
- 52. RIFE’s Boldness 2008 JavaOneSM Conference | java.sun.com/javaone | 52
- 53. RIFE’s Boldness Java method calls are trapped at runtime when classes are loaded to rewrite the code sections they're executing in (pause(), call(), answer()) Intuitive state handling, requiring no serialization Regular Java language statements direct application control flow Regular Java development tools like debuggers and IDEs can be used to develop, document and debug application control flow Continuation trees for backward and forward stepping 2008 JavaOneSM Conference | java.sun.com/javaone | 53
- 54. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 54
- 55. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 55
- 56. What is Google Web Toolkit? Create AJAX applications in the Java programming language using regular Java tools and deploy them to browser- compliant HTML and Javascript™ technology 2008 JavaOneSM Conference | java.sun.com/javaone | 56
- 57. Google Web Toolkit Overview 2008 JavaOneSM Conference | java.sun.com/javaone | 57
- 58. Google Web Toolkit approach 'Regular' Ajax Dev Different approach • Write Javascript code and • Write Ajax applications in the DHTML Java platform • Learn all the intricacies • Compile Java code to Javascript code Difficult to test Client-side debuggers Javascript versions Toolkit (GWT) Google Web Browser differences use Java platform, standard APIs and your packaging Smart text editors Resource regular tools Ajax Libraries Design RPC API and format 2008 JavaOneSM Conference | java.sun.com/javaone | 58
- 59. GWT’s main features Two main execution modes • Hosted mode • Executed with the JVM, no generated Javascript source code • Embedded browser hooks into Java libraries • Code-test-debug as regular Java applications • Web mode • Compiles Java source code to Javascript source code • Runs inside browser without plugins Standardized RPC • Implement RemoteService interface • Relies on serialization for arguments and return values • Supports asynchronous method calls 2008 JavaOneSM Conference | java.sun.com/javaone | 59
- 60. GWT Examples (with Eclipse) 2008 JavaOneSM Conference | java.sun.com/javaone | 60
- 61. Hello World 2008 JavaOneSM Conference | java.sun.com/javaone | 61
- 62. GWT Hello World Create a new project and generate the required files Import project into Eclipse 2008 JavaOneSM Conference | java.sun.com/javaone | 62
- 63. Hello World - com/client/HelloWorldApp.java 2008 JavaOneSM Conference | java.sun.com/javaone | 63
- 64. Hello World - com/public/HelloWorldApp.html 2008 JavaOneSM Conference | java.sun.com/javaone | 64
- 65. Demo GWT Hello World 2008 JavaOneSM Conference | java.sun.com/javaone | 65
- 66. RPC 2008 JavaOneSM Conference | java.sun.com/javaone | 66
- 67. RPC Services com/client/GreeterService.java com/services/GreeterServiceImpl.java com/client/GreeterServiceAsync.java 2008 JavaOneSM Conference | java.sun.com/javaone | 67
- 68. RPC GWT Module - com/RpcApp.gwt.xml 2008 JavaOneSM Conference | java.sun.com/javaone | 68
- 69. RPC App - com/client/RpcApp.java 1/2 2008 JavaOneSM Conference | java.sun.com/javaone | 69
- 70. RPC App - com/client/RpcApp.java 2/2 2008 JavaOneSM Conference | java.sun.com/javaone | 70
- 71. Demo GWT RPC 2008 JavaOneSM Conference | java.sun.com/javaone | 71
- 72. GWT’s Boldness 2008 JavaOneSM Conference | java.sun.com/javaone | 72
- 73. GWT’s Boldness Two execution modes simplify both development and deployment Browser is hooked into Java libraries to provide real debugging during hosted mode The Java source code is compiled to the Javascript source code during web mode to hide the difficulties of Ajax/DHTML development 2008 JavaOneSM Conference | java.sun.com/javaone | 73
- 74. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 74
- 75. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 75
- 76. What is Google Android? A platform for mobile devices where software is written in the Java language and run on Dalvik, a custom virtual machine for embedded use 2008 JavaOneSM Conference | java.sun.com/javaone | 76
- 77. Google Android Overview 2008 JavaOneSM Conference | java.sun.com/javaone | 77
- 78. Google Android approach 'Regular' Mobile Dev Different approach • Proprietary platform • Open-source platform • Java™ Platform, Micro Edition • All applications in Java (Java ME) is just another programming language application • Dedicated virtual machine • Java applications run in the per application same virtual machine 2008 JavaOneSM Conference | java.sun.com/javaone | 78
- 79. Google Android Architecture 2008 JavaOneSM Conference | java.sun.com/javaone | 79
- 80. Demo Google Android Too many snippets and resources to show code in slides 2008 JavaOneSM Conference | java.sun.com/javaone | 80
- 81. Google Android’s Boldness 2008 JavaOneSM Conference | java.sun.com/javaone | 81
- 82. Google Android’s Boldness Program everything in the Java programming language Only use Android's Java Platform Runtime Environment (JRE), which includes supported library classes Compile with javac and convert to Android bytecode for the Dalvik VM (.dex files) Debug through the Dalvik Debug Monitor Server (DDMS) which forwards ports from the emulator or device to the IDE 2008 JavaOneSM Conference | java.sun.com/javaone | 82
- 83. Agenda Java programming language != JVM != Java platform Terracotta RIFE Continuations Google Web Toolkit Google Android 2008 JavaOneSM Conference | java.sun.com/javaone | 83
- 84. Conclusion Using just the Java language you're able to do: • Transparent Clustering and Coordination: Terracotta (http://www.terracotta.org) • Intuitive application control flow: RIFE Continuations (http://rifers.org) • Ajax client application development: Google Web Toolkit (http://code.google.com/webtoolkit) • First-class mobile application development: Google Android (http://code.google.com/android) Without learning new languages and tools, all these possibilities open up 2008 JavaOneSM Conference | java.sun.com/javaone | 84
- 85. Boldly go where the Java programming language has never gone before Geert Bevin http://terracotta.org - http://rifers.org