BP203 limitless languages


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BP203 limitless languages

  1. 1. BP203 Limitless Languages In The IBM Social Stack Mark Myers | London Developer Coop© 2013 IBM Corporation
  2. 2. AgendaOverviewThe JVMProgramming paradigmsJVM Alternative LanguagesScalaExisting CodeWorking With Domino © 2013 IBM Corporation
  3. 3. This presentation skims over the hard work and dedication of thousands of developers passions, any generalizations or sweeping statements are not intended to give offense, corrections are gratefully received. But most of all please interrupt! Dont wait till the end of the session © 2013 IBM Corporation
  4. 4. Who Am I? Mark Member of the London Developer Co-op (londc.com) Developer from a support background 12+ years on Domino, 15+ years in IT Speaker at 2x Lotuspheres, 3x UKLUGs, 1x ILUG Twitter: @stickfight, Skype: Stickfight, Blog: stickfight.co.uk © 2013 IBM Corporation
  5. 5. Tools We Used IBM® Lotus® Notes® version 8.5.3 IBM Lotus Domino® version 8.5.3 Eclipse 3.7 (indigo) Scala plug-in 29 Various other software tools mentioned throughout this presentation Most code and techniques we talk about should be applicable to other versions of Notes/Domino/Windows too © 2013 IBM Corporation
  6. 6. Limitless Languages? Limitless Languages = Alternative JVM Languages Alternative JVM Languages = Any Language that Compiles to Java ByteCode © 2013 IBM Corporation
  7. 7. Why this Session? Existing and Traditional IT cant keep up with the speed of green field and start-up development You need little or no Investment to get started and you don’t have to throw your existing Java stuff away Its not all up to IBM to keep us up to date. Nearly all of you are already using an Never get left behind again IBM alternative JVM Its simple and helps your CV Language (sort of) Its Cool © 2013 IBM Corporation
  8. 8. The JVMThe JVM (Java Virtual Machine) runs Java ByteCodeIt’s Increased in reliability and performance since 1996All variations of the JVM guarantees binary compatibilityJava ByteCode does NOT have to have been generated from Java, any Languagethat compiles down to ByteCode can run on the JVM We will take a look at the Pack Leaders After some boring stuff © 2013 IBM Corporation
  9. 9. Dynamic Vs Static typed: Dynamic In a dynamically typed language, every variable name is (unless it is null) bound only to an object. Names are bound to objects at execution time by means of assignment statements, and it is possible to bind a name to objects of different types during the execution of the program. This does not cause an error, unless you for get which type LotusNotes = 8.5.4 the variable currently is LotusNotes = “Awesome” © 2013 IBM Corporation
  10. 10. Dynamic Vs Static typed: Static In a statically typed language, every variable name is bound both to a type (at compile time) and to an object. Once a variable name has been bound to a type (that is, declared) it can be bound (via an assignment statement) only to objects of that type; it cannot ever be bound to an object of a different type. An attempt to bind the name to an object of the wrong type will raise a type exception. © 2013 IBM Corporation
  11. 11. Functional Programming A method of coding like Object Oriented Programming“functional programming is a programming paradigm that treats computations as theevaluation of mathematical functions and avoids state and mutable data.” -Wikipedia Think of the states An object which a document goes can be modified through after it is created © 2013 IBM Corporation
  12. 12. Functional ProgrammingWhy? Grants us greater modularity Means code reuse and maintenance is easier Immutable objects allows data to be accessed concurrently from multiple threads without locking © 2013 IBM Corporation
  13. 13. JVM Alternative Languages An agile and dynamic language A Core of Java with lots of features inspired by languages like Python, Ruby and Smalltalk Very small-zero learning curve provides the ability to statically type check and statically compile your code ( good for speed) Seamlessly integrates with all existing Java classes and libraries i.e. unlike a lot of other Alternative JVM languages you can include Java code in the same file as Groovy One of Groovys top companions is Grails, a high-productivity web development environment inspired by Ruby on Rails. not much use for domino designers but fab if you are having to build your own UI (used by sky) © 2013 IBM Corporation
  14. 14. JVM Alternative Languages A general-purpose dynamic programming language Is a dialect of Lisp Also runs on Microsofts Common Language Runtime and JavaScript engines. Used by Citigroup, Typewire, Tianya (largest forum in china), AltLaw.org (one of the first production websites to use it) © 2013 IBM Corporation
  15. 15. JVM Alternative Languages JRuby is an implementation of the Ruby programming language JRuby is held to be faster than Ruby for most implementations (once loading the JVM is taken into consideration) Jruby is called from Java using either the JSR 223 Scripting for Java 6 or the Apache Bean Scripting framework LinkedIn uses JRuby for its front end © 2013 IBM Corporation
  16. 16. JVM Alternative Languages Jython the successor of JPython is an implementation of Python Supports nearly all of the Core Python standard library modules and all Java Libs Jython programs cannot currently use CPython extension modules written in C (although this is supposedly coming) Wsadmin (webSphere Server command shell) and Bea WebLogic use Jython as their scripting language © 2013 IBM Corporation
  17. 17. JVM Alternative Languages Kotlin Rhino This is the Actual Logo © 2013 IBM Corporation
  18. 18. Scala Stands for “scalable language.” named for its ability to grow with user needs Designed by Martin Odersky, creator of Pizza (the forerunner of Java generics), author of GJ compiler"... if someone had shown me the Programming in Scala book ... back in 2003, Idprobably have never created Groovy." - James Strachan, July 2009 © 2013 IBM Corporation
  19. 19. ScalaUnder active development at Ecole Polytechnique Fédéralede Lausanne (EPFL) and in the open source community,also nicely funded by none corporations. Programming in Scala second edition by Martin Odersky, Lex Spoon and Bill Venners http://www.artima.com/shop/programming_in_scala_2ed © 2013 IBM Corporation
  20. 20. Who Uses Scala? LinkedIn Siemens Twitter Électricité de France (EDF) FourSquare The Guardian Sony Xerox IBM knows about it too, see Adrian Spender excellent presentation at http://www.slideshare.net/aspender/scala-introduction-6963846 And from IBM them selves http://www.ibm.com/developerworks/training/kp/j-kp-altlang/index.html © 2013 IBM Corporation
  21. 21. Why?: Shorter / Less Boiler // this is Java class MyClass { private int index; private String name; public MyClass(int index, String name) { this.index = index; this.name = name; } } // this is Scala class MyClass(index: Int, name: String) http://stackoverflow.com/questions/2952732/samples-of-scala-and-java-code- where-scala-code-looks-simpler-has-fewer-lines for an extreme example © 2013 IBM Corporation
  22. 22. Why?: Type Inference Java – Static Type Good – Catch type errors BEFORE you run BAD – Verbose, bulky Scripting Languages Good – Short , easy to code BAD – You get to catch your errors in test/production Scala (with Type Inference) Good – Catch Type Errors BEFORE you run Good – Short , easy to code © 2013 IBM Corporation
  23. 23. Why?: Type Inference You don’t have to assign a type here, it infers this from type of data you try and put in the variable val cost = new BigInteger("99999999") var stringcost = List("nine", "nine") Stringcost += cost But Compiler still says no, when you assign the wrong type © 2013 IBM Corporation
  24. 24. Why?: Unified types All types are objects. (Int, Boolean,Double etc etc) No more primitives ( no more double and Double) All Mapped Automatically for integration with Java All functions get the nice add-ons like toInt and toFloat for String © 2013 IBM Corporation
  25. 25. Why?: Pattern matching Not Limited to primitives You can even call Class and Functions :-) © 2013 IBM Corporation
  26. 26. Why?: Actors Concurrency Made simple Designed to get over the fundamental problems with Javas shared data and locks model It is a share-nothing model all communication is doing by messaging An actor is a bit like a thread with a mailbox for receiving messages © 2013 IBM Corporation
  27. 27. Why?: Actor example © 2013 IBM Corporation
  28. 28. Why?: Parallel Processing How do you make this run in parallel? © 2013 IBM Corporation
  29. 29. Why?: Parallel Processing Now running in parallel Calling thread WAITS for completion of computation 2 CPU Machine = 2 items running in parallel © 2013 IBM Corporation
  30. 30. Sanity Warning! : Scalaz Danger Will Robinson A Plug in Library for Scala An implementation of pure functional programming with very high-level abstractions represented by symbols Awesomely powerful and concise but a steep learning curve unless you are familiar with the complexity and are dealing with things like Trading platforms http://code.google.com/p/scalaz/ © 2013 IBM Corporation
  31. 31. Sanity Warning! : Scalaz :-( © 2013 IBM Corporation
  32. 32. Cross Language Dependency Existing Code © 2013 IBM Corporation
  33. 33. Cross Language Dependency After Inclusion of a new Scala Class © 2013 IBM Corporation
  34. 34. Installing Scala has plug-ins for Eclipse, IntelliJIDEA and NetBeans ( http://www.scala- lang.org/node/91 ) I use http://scala-ide.org/ for the eclipse plug-in Install Eclipse 3.6 (Helios) or Eclipse 3.7 (Indigo) and install as a standard plug-in site (http://download.scala-ide.org/releases-29/stable/site ) Restart and you’re done © 2013 IBM Corporation
  35. 35. Nice and Simple in Eclipse © 2013 IBM Corporation
  36. 36. Nice and Simple in Eclipse © 2013 IBM Corporation
  37. 37. Working in DominoCopy these 3 files to your ..jvmlibext directory (they are about 9meg in total andcause a noticeable pause if in the agent)Restart and you’re done © 2013 IBM Corporation
  38. 38. Working in Domino Normal Java Class doing Stuff in Domino © 2013 IBM Corporation
  39. 39. Working in Domino Scala Class, containing an Scala Object, calling that Java Class © 2013 IBM Corporation
  40. 40. Working in Domino Export Class files to a Jar © 2013 IBM Corporation
  41. 41. Working in DominoImport Jar file into normal Agent © 2013 IBM Corporation
  42. 42. Working in DominoCalling the ScalaObject from Within a Java Agent © 2013 IBM Corporation
  43. 43. Working in DominoBe Still my beating heart!!! © 2013 IBM Corporation
  44. 44. Questions? Mark Myers London Developer Coop mark@energywins.co.uk Twitter: @stickfight© 2013 IBM Corporation
  45. 45. Legal disclaimer • © IBM Corporation 2013. All Rights Reserved. • The information contained in this publication is provided for informational purposes only. While efforts were made to verify the completeness and accuracy of the information contained in this publication, it is provided AS IS without warranty of any kind, express or implied. In addition, this information is based on IBM’s current product plans and strategy, which are subject to change by IBM without notice. IBM shall not be responsible for any damages arising out of the use of, or otherwise related to, this publication or any other materials. Nothing contained in this publication is intended to, nor shall have the effect of, creating any warranties or representations from IBM or its suppliers or licensors, or altering the terms and conditions of the applicable license agreement governing the use of IBM software. • References in this presentation to IBM products, programs, or services do not imply that they will be available in all countries in which IBM operates. Product release dates and/or capabilities referenced in this presentation may change at any time at IBM’s sole discretion based on market opportunities or other factors, and are not intended to be a commitment to future product or feature availability in any way. Nothing contained in these materials is intended to, nor shall have the effect of, stating or implying that any activities undertaken by you will result in any specific sales, revenue growth or other results. • Performance is based on measurements and projections using standard IBM benchmarks in a controlled environment. The actual throughput or performance that any user will experience will vary depending upon many factors, including considerations such as the amount of multiprogramming in the users job stream, the I/O configuration, the storage configuration, and the workload processed. Therefore, no assurance can be given that an individual user will achieve results similar to those stated here. • Adobe, the Adobe logo, PostScript, and the PostScript logo are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States, and/or other countries. • Java and all Java-based trademarks are trademarks of Sun Microsystems, Inc. in the United States, other countries, or both. • Microsoft and Windows are trademarks of Microsoft Corporation in the United States, other countries, or both. • Intel, Intel Centrino, Celeron, Intel Xeon, Intel SpeedStep, Itanium, and Pentium are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. • UNIX is a registered trademark of The Open Group in the United States and other countries. • Linux is a registered trademark of Linus Torvalds in the United States, other countries, or both. Other company, product, or service names may be trademarks or service marks of others. • All references to [insert fictitious company name] refer to a fictitious company and are used for illustration purposes only. 45 © 2013 IBM Corporation
  46. 46. THANK YOU! Mark Myers London Developer Coop mark@energywins.co.uk Twitter: @stickfight© 2013 IBM Corporation