Download as PDF, PPTX
![Closures
dit
Func/ons)
Click
to
e(or
Master
/tle
style
(defn adder [a b] (+ a b))](https://image.slidesharecdn.com/confesspolyglotprogramming-110412100400-phpapp02/75/Polyglot-Programming-CONFESS-25-2048.jpg)
![Enhanced
Switch
Click
to
edit
Master
/tle
style
def letterGrade(grade) {
switch(grade) {
case 90..100: return ‘A‘
case 80..<90: return ‘B‘
case 70..<80: return ‘C‘
case 60..<70: return ‘D‘
case 0..<60: return ‘F‘
case ~"[ABCDFabcdf]":
return grade.toUpperCase()
}
throw new IllegalArgumentException('invalid
grade ‘+grade)
}](https://image.slidesharecdn.com/confesspolyglotprogramming-110412100400-phpapp02/75/Polyglot-Programming-CONFESS-27-2048.jpg)
![Enhanced
Switch
Click
to
edit
Master
/tle
style
(defn letter-grade [grade]
(cond
(in grade 90 100) "A"
(in grade 80 90) "B"
(in grade 70 80) "C"
(in grade 60 70) "D"
(in grade 0 60) "F"
(re-find #"[ABCDFabcdf]" grade)
(.toUpperCase grade)))](https://image.slidesharecdn.com/confesspolyglotprogramming-110412100400-phpapp02/75/Polyglot-Programming-CONFESS-29-2048.jpg)
![Closures
dit
Func/ons)
Click
to
e(or
Master
/tle
style
(defn adder [a b] (+ a b))](https://crownmelresort.com/image.slidesharecdn.com/confesspolyglotprogramming-110412100400-phpapp02/75/Polyglot-Programming-CONFESS-25-2048.jpg)
![Enhanced
Switch
Click
to
edit
Master
/tle
style
def letterGrade(grade) {
switch(grade) {
case 90..100: return ‘A‘
case 80..<90: return ‘B‘
case 70..<80: return ‘C‘
case 60..<70: return ‘D‘
case 0..<60: return ‘F‘
case ~"[ABCDFabcdf]":
return grade.toUpperCase()
}
throw new IllegalArgumentException('invalid
grade ‘+grade)
}](https://crownmelresort.com/image.slidesharecdn.com/confesspolyglotprogramming-110412100400-phpapp02/75/Polyglot-Programming-CONFESS-27-2048.jpg)
![Enhanced
Switch
Click
to
edit
Master
/tle
style
(defn letter-grade [grade]
(cond
(in grade 90 100) "A"
(in grade 80 90) "B"
(in grade 70 80) "C"
(in grade 60 70) "D"
(in grade 0 60) "F"
(re-find #"[ABCDFabcdf]" grade)
(.toUpperCase grade)))](https://crownmelresort.com/image.slidesharecdn.com/confesspolyglotprogramming-110412100400-phpapp02/75/Polyglot-Programming-CONFESS-29-2048.jpg)
Uploaded byAndres Almiray
Polyglot Programming @ CONFESS
The document discusses various ways that Java code can be made less verbose through the use of polyglot programming on the JVM. It provides examples of how features like standard beans, closures/functions, and enhanced switch statements can be implemented more concisely in languages like Groovy and Scala that run on the JVM compared to Java code. It also mentions that Java interoperates well with these other JVM languages.
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Polyglot Programming @ CONFESS
- 1. Click to edit Master /tle style Polyglot Programming he JVM he JVM Or how I learned to stop worrying and love t in t
- 2. About t edit Master Click to he Speaker /tle style • Java developer since the beginning • True believer in Open Source • Groovy commiBer since 2007 • Project lead of the Griffon framework • Currently working for
- 3. I confess… Click to edit Master /tle style <j:jelly xmlns:j="jelly:core" xmlns:define="jelly:define" xmlns:my="myTagLib"> <define:taglib uri="myTagLib"> <define:jellybean name="foo" className="MyTask"/> </define:taglib> Now lets use the new tag <my:foo x="2" y="cheese"/> </j:jelly>
- 4. Some o edit Master /tle style Click t facts about Java Previous name was Oak – Bonus points for knowing its real name before that Made its public appearance in 1995 C/C++ were king at the /me Networking, mul/threading were baked right into the language Developers came for the applets and stayed for the components (JEE and all that jazz)
- 5. However... Master /tle style Click to edit It‘s already in its teens It has not seen a major feature upgrade since JDK5 was released back in 2004 -‐> generics (and we do know how that turned out to be, don’t we?) JDK7 was been delayed again (scheduled for Q3 2011) Some features will not make the cut (closures are in apparently)
- 6. More o edit Master /tle style Click tso... It is rather verbose when compared to how other languages do the same task Its threading features are no longer enough. Concurrent programs desperately cry for immutability these days
- 7. Truth o edit Master /tle style Click tor myth? Is Java ofenly referred as overengineered?
- 8. Truth o edit Master /tle style Click tor myth? Can you build a Java based web applica/on (for argument sake a basic TwiBer clone) in less than a day‘s work WITHOUT an IDE?
- 9. Truth o edit Master /tle style Click tor myth? Did James Gosling ever say he was threatened with bodily harm should operator overloading find its way into Java?
- 10. Click to edit Master /tle style The JVM is a great place to work however Java makes it painful some/mes...
- 11. Click to edit Master /tle style What can we do about it?!
- 12. Click to edit Master /tle style
- 13. Click to edit Master /tle style Disclaimer (this is not a bash-‐the-‐other-‐languages talk)
- 14. Click to edit Master /tle style Reduced Verbosity
- 15. Standard Beans Click to edit Master /tle style public class Bean { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
- 16. Standard Beans Click to edit Master /tle style public class Bean { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
- 17. Standard Beans Click to edit Master /tle style public class Bean { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
- 18. Standard Beans Click to edit Master /tle style class Bean { String name }
- 19. Standard Beans Click to edit Master /tle style class Bean(var name:String) class Bean { @scala.reflect.BeanProperty var name: String }
- 20. Standard Beans Click to edit Master /tle style (defstruct Bean :name)
- 21. Closures dit Func/ons) Click to e(or Master /tle style public interface Adder { int add(int a, int b); } public class MyAdder implements Adder { public int add(int a, int b) { return a + b; } }
- 22. Closures dit Func/ons) Click to e(or Master /tle style // JDK7 Lambdas proposal #(int a, int b)(a + b) #(int a, int b) { return a + b; }
- 23. Closures dit Func/ons) Click to e(or Master /tle style def adder = { a , b -> a + b }
- 24. Closures dit Func/ons) Click to e(or Master /tle style val adder = (a:Int, b:Int) => a + b
- 25. Closures dit Func/ons) Click to e(or Master /tle style (defn adder [a b] (+ a b))
- 26. Enhanced switch Click to edit Master /tle style char letterGrade(int grade) { if(grade >= 0 && grade <= 60) return ‘F‘; if(grade > 60 && grade <= 70) return ‘D‘; if(grade > 70 && grade <= 80) return ‘C‘; if(grade > 80 && grade <= 90) return ‘B‘; if(grade > 90 && grade <= 100) return ‘A‘; throw new IllegalArgumentException("invalid grade "+grade); }
- 27. Enhanced Switch Click to edit Master /tle style def letterGrade(grade) { switch(grade) { case 90..100: return ‘A‘ case 80..<90: return ‘B‘ case 70..<80: return ‘C‘ case 60..<70: return ‘D‘ case 0..<60: return ‘F‘ case ~"[ABCDFabcdf]": return grade.toUpperCase() } throw new IllegalArgumentException('invalid grade ‘+grade) }
- 28. Enhanced Switch Click to edit Master /tle style val VALID_GRADES = Set("A", "B", "C", "D", "F") def letterGrade(value: Any):String = value match { case x:Int if (90 to 100).contains(x) => "A" case x:Int if (80 to 90).contains(x) => "B" case x:Int if (70 to 80).contains(x) => "C" case x:Int if (60 to 70).contains(x) => "D" case x:Int if (0 to 60).contains(x) => "F" case x:String if VALID_GRADES(x.toUpperCase) => x.toUpperCase() }
- 29. Enhanced Switch Click to edit Master /tle style (defn letter-grade [grade] (cond (in grade 90 100) "A" (in grade 80 90) "B" (in grade 70 80) "C" (in grade 60 70) "D" (in grade 0 60) "F" (re-find #"[ABCDFabcdf]" grade) (.toUpperCase grade)))
- 30. Click to edit Master /tle style Java Interoperability
- 31. All of these are true /tle style Click to edit Master Java can call Groovy, Scala and Clojure classes as if they were Java classes Groovy, Scala and Clojure can call Java code without breaking a sweat! In other words, interoperability with Java is a given. No need for complicated bridges between languages (i.e. JSR 223)
- 32. Click to edit Master /tle style OK, so... What else can these languages do?
- 33. All of them Master /tle style Click to edit Na/ve syntax for collec/on classes Everything is an object Closures! Regular expressions as first class ci/zens Operator overloading
- 34. Groovy edit Master /tle style Click to Metaprogramming (HOT!) both at build/me and run/me Builders Healthy ecosystem: Grails, Griffon, Gant, Gradle, Spock, Gaelyk, Gpars, CodeNarc, etc... Not an exhaus/ve list of features!
- 35. Scala to edit Master /tle style Click Richer type system Type inference PaBern matching (case classes) Actor model Traits Not an exhaus/ve list of features!
- 36. Clojure edit Master /tle style Click to Data as code and viceversa Immutable structures STM Not an exhaus/ve list of features!
- 37. Click to edit Master /tle style Demo
- 38. Click to edit Master /tle style Other places where you‘ll find Polyglot Programming
- 39. Web to edit Master /tle style Click app development XML SQL JavaScript JSON CSS Flash/Flex/Ac/onScript
- 40. Next-‐Gen datastores (tle style Click to edit Master / NoSQL) FleetDB -‐> Clojure FlockDB -‐> Scala CouchDB, Riak -‐> Erlang By the way, watch out for Polyglot Persistence ;-‐)
- 41. Build tsystems aster /tle style Click o edit M Gradle, Gant -‐> Groovy Rake -‐> Ruby/JRuby Maven3 -‐> XML, Groovy, Ruby
- 42. Par/ng thoughts /tle style Click to edit Master Java (the language) may have reached its maturity feature wise (it’s not dead though!) Other JVM languages have evolved faster Polyglot Programming is not a new concept Download and play with each of the demoed languages, maybe one of them strikes your fancy
- 43. Resources Master /tle style Click to edit
- 44. Click to edit Master /tle style Q & A
- 45. Click to edit Master /tle style hBp://people.canoo.com/share
- 46. Click to edit Master /tle style Thank you!