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Groovy in 2014 and beyond at GR8Conf Europe 2014

Groovy in 2014 and beyond at GR8Conf Europe 2014

Groovy 2.3 coverage and what the future holds

Guillaume Laforge

June 04, 2014
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  1. Groovy in 2014 & beyond
    Guillaume Laforge
    Groovy Project Manager
    http://glaforge.appspot.com
    @glaforge

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  2. View Slide

  3. Stay up-to-date
    Groovy Weekly newsletter (Every Tuesday)

    http://bit.ly/groovy-weekly-subscribe

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  4. Stay up-to-date
    Groovy Google+ page

    https://google.com/+groovy

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  5. Stay up-to-date
    Groovy Google+ community
    http://bit.ly/g-community

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  6. Agenda

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  7. The Groovy roadmap…
    2015
    2014
    2013
    Groovy 2.3
    Groovy 2.4
    Groovy 2.2
    Groovy 3.0

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  8. Groovy 2.3
    • JDK 8 runtime support

    • Traits

    • New and updates AST transformations

    • NIO2 module

    • JSON improvements & performance gains

    • New Markup template engine

    • Documentation overhaul

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  9. Groovy 3.0
    !
    • New Meta-Object Protocol

    !
    • Invoke-dynamic based runtime

    !
    • Rewritten language grammar with Antlr v4

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  10. @YourTwitterHandle
    #DVXFR14{session
    hashtag}
    Groovy 2.3

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  11. @YourTwitterHandle
    JDK 8 support

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  12. JDK 8 support — closures & lambdas
    IntStream.range(1,  100).forEach(s  -­‐>      
                                             System.out.println(s));  
    !
    Files.lines(Paths.get('README.adoc'))  
             .map(it  -­‐>  it.toUpperCase())  
             .forEach(it  -­‐>  System.out.println(it));

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  13. JDK 8 support — closures & lambdas
    IntStream.range(1,  100).forEach(s  -­‐>      
                                             System.out.println(s));  
    !
    Files.lines(Paths.get('README.adoc'))  
             .map(it  -­‐>  it.toUpperCase())  
             .forEach(it  -­‐>  System.out.println(it));
    IntStream.range(1,  100).forEach  {  println  it  }  
    !
    Files.lines(Paths.get('README.adoc'))  
             .map  {  it.toUpperCase()  }  
             .forEach  {  println  it  }

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  14. JDK 8 support — closures & lambdas
    IntStream.range(1,  100).forEach(s  -­‐>      
                                             System.out.println(s));  
    !
    Files.lines(Paths.get('README.adoc'))  
             .map(it  -­‐>  it.toUpperCase())  
             .forEach(it  -­‐>  System.out.println(it));
    IntStream.range(1,  100).forEach  {  println  it  }  
    !
    Files.lines(Paths.get('README.adoc'))  
             .map  {  it.toUpperCase()  }  
             .forEach  {  println  it  }
    Use Groovy closures
    wherever you pass
    lambdas in Java 8

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  15. @YourTwitterHandle
    Traits

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  16. Traits
    • Like interfaces, but with method bodies

    • similar to Java 8 interface default methods

    • Elegant way to compose behavior

    • multiple inheritance, without the « diamond problem »

    • Traits can also be stateful

    • traits can have properties like normal classes

    • Compatible with static typing & compilation
    • class methods coming from traits are also visible from Java

    • Also possible to implement traits at runtime

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  17. trait  FlyingAbility  {  
           String  fly()  {  "I'm  flying!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird()  
    !
    assert  b.fly()  ==  "I'm  flying!"
    Traits: a simple example

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  18. trait  FlyingAbility  {  
           String  fly()  {  "I'm  flying!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird()  
    !
    assert  b.fly()  ==  "I'm  flying!"
    Traits: a simple example
    « trait », a new keyword
    for a new concept

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  19. trait  FlyingAbility  {  
           String  fly()  {  "I'm  flying!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird()  
    !
    assert  b.fly()  ==  "I'm  flying!"
    Traits: a simple example
    a class 

    « implements »

    a trait

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  20. trait  FlyingAbility  {  
           String  fly()  {  "I'm  flying!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird()  
    !
    assert  b.fly()  ==  "I'm  flying!"
    Traits: a simple example
    the fly() method
    from the trait is
    available

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  21. trait  FlyingAbility  {  
           String  fly()  {  "I'm  flying!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird()  
    !
    assert  b.fly()  ==  "I'm  flying!"
    Traits: a simple example

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  22. trait  Named  {  
           String  name  
    }  
    !
    class  Bird  implements  Named  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'
    Traits: stateful

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  23. trait  Named  {  
           String  name  
    }  
    !
    class  Bird  implements  Named  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'
    Traits: stateful
    a Groovy property

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  24. trait  Named  {  
           String  name  
    }  
    !
    class  Bird  implements  Named  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'
    Traits: stateful
    implement the trait

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  25. trait  Named  {  
           String  name  
    }  
    !
    class  Bird  implements  Named  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'
    Traits: stateful
    Groovy named
    argument constructor

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  26. trait  Named  {  
           String  name  
    }  
    !
    class  Bird  implements  Named  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'
    Traits: stateful
    access the property

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  27. trait  Named  {  
           String  name  
    }  
    !
    class  Bird  implements  Named  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'
    Traits: stateful

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  28. trait  Named  {  String  name  }  
    !
    trait  FlyingAbility  extends  Named  {  
           String  fly()  {  "I'm  a  flying  ${name}!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: inheritance

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  29. trait  Named  {  String  name  }  
    !
    trait  FlyingAbility  extends  Named  {  
           String  fly()  {  "I'm  a  flying  ${name}!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: inheritance
    extend the Named trait

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  30. trait  Named  {  String  name  }  
    !
    trait  FlyingAbility  extends  Named  {  
           String  fly()  {  "I'm  a  flying  ${name}!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: inheritance
    access the name
    property

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  31. trait  Named  {  String  name  }  
    !
    trait  FlyingAbility  extends  Named  {  
           String  fly()  {  "I'm  a  flying  ${name}!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: inheritance
    implement the composite trait

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  32. trait  Named  {  String  name  }  
    !
    trait  FlyingAbility  extends  Named  {  
           String  fly()  {  "I'm  a  flying  ${name}!"  }  
    }  
    !
    class  Bird  implements  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: inheritance

    View Slide

  33. trait  FlyingAbility  {  
           String  fly()  {  "I'm  a  flying  $name!"  }  
    }  
    !
    trait  Named  {  String  name  }  
    !
    class  Bird  implements  Named,  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: multiple inheritance (+dyn.)

    View Slide

  34. trait  FlyingAbility  {  
           String  fly()  {  "I'm  a  flying  $name!"  }  
    }  
    !
    trait  Named  {  String  name  }  
    !
    class  Bird  implements  Named,  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: multiple inheritance (+dyn.)
    access a dynamic property

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  35. trait  FlyingAbility  {  
           String  fly()  {  "I'm  a  flying  $name!"  }  
    }  
    !
    trait  Named  {  String  name  }  
    !
    class  Bird  implements  Named,  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: multiple inheritance (+dyn.)
    implements two traits!

    View Slide

  36. trait  FlyingAbility  {  
           String  fly()  {  "I'm  a  flying  $name!"  }  
    }  
    !
    trait  Named  {  String  name  }  
    !
    class  Bird  implements  Named,  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: multiple inheritance (+dyn.)
    dynamic ‘name’ property
    interpolated

    View Slide

  37. trait  FlyingAbility  {  
           String  fly()  {  "I'm  a  flying  $name!"  }  
    }  
    !
    trait  Named  {  String  name  }  
    !
    class  Bird  implements  Named,  FlyingAbility  {}  
    def  b  =  new  Bird(name:  'Colibri')  
    !
    assert  b.name  ==  'Colibri'  
    assert  b.fly()  ==  "I'm  a  flying  Colibri!"
    Traits: multiple inheritance (+dyn.)

    View Slide

  38. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?

    View Slide

  39. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?
    two surf() methods

    View Slide

  40. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?

    View Slide

  41. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?
    extending a class and
    implementing the two traits

    View Slide

  42. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?

    View Slide

  43. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?
    last declared trait wins!

    View Slide

  44. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  KiteSurfer,  WebSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'web'
    Traits: what about conflicts?

    View Slide

  45. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?

    View Slide

  46. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?
    reverse the order!

    View Slide

  47. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {}  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?

    View Slide

  48. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {  
           String  surf()  {  KiteSurfer.super.surf()  }  
    }  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?

    View Slide

  49. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {  
           String  surf()  {  KiteSurfer.super.surf()  }  
    }  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?
    Be explicit!
    Override surf() 

    & use ‘super’

    View Slide

  50. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {  
           String  surf()  {  KiteSurfer.super.surf()  }  
    }  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?
    Your class method takes
    precedence over the traits

    View Slide

  51. trait  KiteSurfer  {  String  surf()  {  'kite'  }  }  
    !
    trait  WebSurfer    {  String  surf()  {    'web'  }  }  
    !
    class  Person  {  String  name  }  
    !
    class  Hipster  extends  Person  
                         implements  WebSurfer,  KiteSurfer  {  
           String  surf()  {  KiteSurfer.super.surf()  }  
    }  
    !
    def  h  =  new  Hipster()  
    assert  h.surf()  ==  'kite'
    Traits: what about conflicts?

    View Slide

  52. trait  Named  {  
           String  name  
    }  
    !
    class  Animal  {}  
    class  NamedAnimal  implements  Named  {}  
    !
    def  na  =  new  NamedAnimal(name:  'Felix')  
    !
    assert  na.name  ==  'Felix'
    Traits: runtime implementation

    View Slide

  53. trait  Named  {  
           String  name  
    }  
    !
    class  Animal  {}  
    class  NamedAnimal  implements  Named  {}  
    !
    def  na  =  new  NamedAnimal(name:  'Felix')  
    !
    assert  na.name  ==  'Felix'
    Traits: runtime implementation
    Somewhat artificial to have to
    create an intermediary class to
    get named animals

    View Slide

  54. trait  Named  {  
           String  name  
    }  
    !
    class  Animal  {}  
    class  NamedAnimal  implements  Named  {}  
    !
    def  na  =  new  NamedAnimal(name:  'Felix')  
    !
    assert  na.name  ==  'Felix'
    Traits: runtime implementation

    View Slide

  55. trait  Named  {  
           String  name  
    }  
    !
    class  Animal  {}  
    !
    !
    def  na  =  new  Animal()  as  Named  
    na.name  =  'Felix'  
    assert  na.name  ==  'Felix'
    Traits: runtime implementation

    View Slide

  56. trait  Named  {  
           String  name  
    }  
    !
    class  Animal  {}  
    !
    !
    def  na  =  new  Animal()  as  Named  
    na.name  =  'Felix'  
    assert  na.name  ==  'Felix'
    Traits: runtime implementation
    Runtime trait, 

    with Groovy’s usual
    coercion mechanism

    View Slide

  57. trait  Named  {  
           String  name  
    }  
    !
    class  Animal  {}  
    !
    !
    def  na  =  new  Animal()  as  Named  
    na.name  =  'Felix'  
    assert  na.name  ==  'Felix'
    Traits: runtime implementation

    View Slide

  58. trait  Named  {  String  name  }  
    !
    trait  Quacks  {  
           String  quack()  {  'Quack!'  }  
    }  
    !
    class  Animal  {}  
    !
    def  na  =  new  Animal().withTraits  Named,  Quacks  
    na.name  =  'Daffy'  
    assert  na.name  ==  'Daffy'  
    assert  na.quack()  ==  'Quack!'
    Traits: runtime implementation

    View Slide

  59. trait  Named  {  String  name  }  
    !
    trait  Quacks  {  
           String  quack()  {  'Quack!'  }  
    }  
    !
    class  Animal  {}  
    !
    def  na  =  new  Animal().withTraits  Named,  Quacks  
    na.name  =  'Daffy'  
    assert  na.name  ==  'Daffy'  
    assert  na.quack()  ==  'Quack!'
    Traits: runtime implementation
    Implement several traits at
    once, at runtime

    View Slide

  60. trait  Named  {  String  name  }  
    !
    trait  Quacks  {  
           String  quack()  {  'Quack!'  }  
    }  
    !
    class  Animal  {}  
    !
    def  na  =  new  Animal().withTraits  Named,  Quacks  
    na.name  =  'Daffy'  
    assert  na.name  ==  'Daffy'  
    assert  na.quack()  ==  'Quack!'
    Traits: runtime implementation

    View Slide

  61. Traits: miscellaneous
    • Traits can…

    !
    • have private fields and methods

    • have abstract methods

    • implement interfaces

    • extend other traits or implement several traits

    • be statically type checked and compiled

    View Slide

  62. @YourTwitterHandle
    AST
    transforms

    View Slide

  63. New: @TailRecursive
    import  groovy.transform.TailRecursive  
    !
    @TailRecursive  
    def  fact(BigInteger  n,  accu  =  1G)  {  
           if  (n  <  2)  accu  
           else  fact(n  -­‐  1,  n  *  accu)  
    }  
    !
    assert  fact(1000)  >  10e2566

    View Slide

  64. New: @TailRecursive
    import  groovy.transform.TailRecursive  
    !
    @TailRecursive  
    def  fact(BigInteger  n,  accu  =  1G)  {  
           if  (n  <  2)  accu  
           else  fact(n  -­‐  1,  n  *  accu)  
    }  
    !
    assert  fact(1000)  >  10e2566
    Rewrites tail recursive
    friendly function serially

    View Slide

  65. New: @TailRecursive
    import  groovy.transform.TailRecursive  
    !
    @TailRecursive  
    def  fact(BigInteger  n,  accu  =  1G)  {  
           if  (n  <  2)  accu  
           else  fact(n  -­‐  1,  n  *  accu)  
    }  
    !
    assert  fact(1000)  >  10e2566
    Doesn’t blow up with a
    stack overflow error

    View Slide

  66. New: @TailRecursive
    import  groovy.transform.TailRecursive  
    !
    @TailRecursive  
    def  fact(BigInteger  n,  accu  =  1G)  {  
           if  (n  <  2)  accu  
           else  fact(n  -­‐  1,  n  *  accu)  
    }  
    !
    assert  fact(1000)  >  10e2566
    Downside of tail recursion is 

    you might have to rewrite 

    your algo to be tailrec friendly

    View Slide

  67. New: @TailRecursive
    import  groovy.transform.TailRecursive  
    !
    @TailRecursive  
    def  fact(BigInteger  n,  accu  =  1G)  {  
           if  (n  <  2)  accu  
           else  fact(n  -­‐  1,  n  *  accu)  
    }  
    !
    assert  fact(1000)  >  10e2566

    View Slide

  68. New: @Sortable
    import  groovy.transform.*  
    !
    @Sortable  
    class  Person  {  
           String  lastName  
           String  firstName  
           int  age  
    }

    View Slide

  69. New: @Sortable
    import  groovy.transform.*  
    !
    @Sortable  
    class  Person  {  
           String  lastName  
           String  firstName  
           int  age  
    }
    Makes the class Comparable
    by multiple Comparators

    View Slide

  70. New: @Sortable
    import  groovy.transform.*  
    !
    @Sortable  
    class  Person  {  
           String  lastName  
           String  firstName  
           int  age  
    }
    First compare by lastName,
    then by firstName, etc.

    View Slide

  71. New: @Sortable
    import  groovy.transform.*  
    !
    @Sortable  
    class  Person  {  
           String  lastName  
           String  firstName  
           int  age  
    }
    You can also specify
    ‘includes’ / ‘excludes’
    properties

    View Slide

  72. New: @Sortable
    import  groovy.transform.*  
    !
    @Sortable  
    class  Person  {  
           String  lastName  
           String  firstName  
           int  age  
    }

    View Slide

  73. @BaseScript improvements
    abstract  class  CustomBase  extends  Script  {  
           int  meaningOfLife  =  42  
    }
    @BaseScript(CustomBase)  
    import  groovy.transform.BaseScript  
    !
    assert  meaningOfLife  ==  42

    View Slide

  74. @BaseScript improvements
    abstract  class  CustomBase  extends  Script  {  
           int  meaningOfLife  =  42  
    }
    @BaseScript(CustomBase)  
    import  groovy.transform.BaseScript  
    !
    assert  meaningOfLife  ==  42
    You can add your own base methods and
    properties to all compiled scripts

    View Slide

  75. @BaseScript improvements
    abstract  class  CustomBase  extends  Script  {  
           int  meaningOfLife  =  42  
    }
    @BaseScript(CustomBase)  
    import  groovy.transform.BaseScript  
    !
    assert  meaningOfLife  ==  42
    Define the base script
    class for this script

    View Slide

  76. @BaseScript improvements
    abstract  class  CustomBase  extends  Script  {  
           int  meaningOfLife  =  42  
    }
    @BaseScript(CustomBase)  
    import  groovy.transform.BaseScript  
    !
    assert  meaningOfLife  ==  42
    In 2.3, ability to put the
    annotation on imports &
    package

    View Slide

  77. @BaseScript improvements
    abstract  class  CustomBase  extends  Script  {  
           int  meaningOfLife  =  42  
    }
    @BaseScript(CustomBase)  
    import  groovy.transform.BaseScript  
    !
    assert  meaningOfLife  ==  42

    View Slide

  78. @BaseScript custom abstract method
    abstract  class  CustomBase  extends  Script  {  
       def  run()  {  
           before()  
           internalRun()  
           after()  
       }  
    !
       abstract  internalRun()  
    !
       def  before()  {  println  'before'  }  
       def  after()    {  println  'after'    }  
    }

    View Slide

  79. @BaseScript custom abstract method
    abstract  class  CustomBase  extends  Script  {  
       def  run()  {  
           before()  
           internalRun()  
           after()  
       }  
    !
       abstract  internalRun()  
    !
       def  before()  {  println  'before'  }  
       def  after()    {  println  'after'    }  
    }
    import  groovy.transform.BaseScript  
    @BaseScript  CustomBase  script  
    !
    println  'Hello'

    View Slide

  80. @BaseScript custom abstract method
    abstract  class  CustomBase  extends  Script  {  
       def  run()  {  
           before()  
           internalRun()  
           after()  
       }  
    !
       abstract  internalRun()  
    !
       def  before()  {  println  'before'  }  
       def  after()    {  println  'after'    }  
    }
    import  groovy.transform.BaseScript  
    @BaseScript  CustomBase  script  
    !
    println  'Hello'
    You can define your own abstract
    method for script bodies

    View Slide

  81. @BaseScript custom abstract method
    abstract  class  CustomBase  extends  Script  {  
       def  run()  {  
           before()  
           internalRun()  
           after()  
       }  
    !
       abstract  internalRun()  
    !
       def  before()  {  println  'before'  }  
       def  after()    {  println  'after'    }  
    }
    import  groovy.transform.BaseScript  
    @BaseScript  CustomBase  script  
    !
    println  'Hello'

    View Slide

  82. @YourTwitterHandle
    NIO2 module

    View Slide

  83. JDK 7+ NIO2 module
    • All the familiar methods on File 

    retrofitted on Path as well
    path.withReader  {  Reader  r  -­‐>  ...  }  
    path.eachLine  {  String  line  -­‐>  ...  }  
    path.eachFileRecurse  {  Path  p  -­‐>  ...  }  
    path  <<  'some  content'  
    path  <<  bytes  
    path.readLines()  

    View Slide

  84. JDK 7+ NIO2 module
    • All the familiar methods on File 

    retrofitted on Path as well
    path.withReader  {  Reader  r  -­‐>  ...  }  
    path.eachLine  {  String  line  -­‐>  ...  }  
    path.eachFileRecurse  {  Path  p  -­‐>  ...  }  
    path  <<  'some  content'  
    path  <<  bytes  
    path.readLines()  

    Feature request to add all the
    java.nio.file.Files static utility
    methods as GDK

    View Slide

  85. JDK 7+ NIO2 module
    • All the familiar methods on File 

    retrofitted on Path as well
    path.withReader  {  Reader  r  -­‐>  ...  }  
    path.eachLine  {  String  line  -­‐>  ...  }  
    path.eachFileRecurse  {  Path  p  -­‐>  ...  }  
    path  <<  'some  content'  
    path  <<  bytes  
    path.readLines()  

    View Slide

  86. @YourTwitterHandle
    JSON

    View Slide

  87. JSON parser / builder perf. increase
    • Re-implementation of JSON support 

    for speed & efficiency

    • parser forked off the Boon JSON project

    • serializer carefully fine-tuned

    !
    • Article on the parsing speed improvements

    • http://rick-hightower.blogspot.fr/2014/04/groovy-and-boon-provide-fastest-json.html

    View Slide

  88. JSON parser / builder perf. increase
    • Re-implementation of JSON support 

    for speed & efficiency

    • parser forked off the Boon JSON project

    • serializer carefully fine-tuned

    !
    • Article on the parsing speed improvements

    • http://rick-hightower.blogspot.fr/2014/04/groovy-and-boon-provide-fastest-json.html

    View Slide

  89. JSON parser / builder perf. increase
    • Re-implementation of JSON support 

    for speed & efficiency

    • parser forked off the Boon JSON project

    • serializer carefully fine-tuned

    !
    • Article on the parsing speed improvements

    • http://rick-hightower.blogspot.fr/2014/04/groovy-and-boon-provide-fastest-json.html
    Benchmark gives 3x to 4x
    performance factor 

    over Jackson and GSON

    View Slide

  90. JSON parser / builder perf. increase
    • Re-implementation of JSON support 

    for speed & efficiency

    • parser forked off the Boon JSON project

    • serializer carefully fine-tuned

    !
    • Article on the parsing speed improvements

    • http://rick-hightower.blogspot.fr/2014/04/groovy-and-boon-provide-fastest-json.html

    View Slide

  91. New modes for parsing
    • Original JsonSlurper renamed to JsonSlurperClassic

    !
    • Additional parsing modes:

    • INDEX_OVERLAY: super fast for <2MB payloads

    • using a « parsing overlay » technique

    • CHARACTER_SOURCE: for >2MB payloads

    • implemented with sliding windows over readers

    • LAX: beyond the JSON spec, nice for configuration files

    • support single quotes, / and # comments

    • CHAR_BUFFER: general purpose

    View Slide

  92. JsonSlurper for configuration files
    import  groovy.json.*  
    import  static  groovy.json.JsonParserType.*  
    !
    def  parser  =  new  JsonSlurper().setType(LAX)  
    !
    def  conf  =  parser.parseText  '''  
           //  configuration  file  
           {  
                   //  no  quote  for  key,  single  quoted  value  
                   environment:  'production'  
                   #  pound-­‐style  comment  
                   'server':  5  
           }  
    '''  
    !
    assert  conf.environment  ==  'production'  
    assert  conf.server  ==  5

    View Slide

  93. JsonSlurper for configuration files
    import  groovy.json.*  
    import  static  groovy.json.JsonParserType.*  
    !
    def  parser  =  new  JsonSlurper().setType(LAX)  
    !
    def  conf  =  parser.parseText  '''  
           //  configuration  file  
           {  
                   //  no  quote  for  key,  single  quoted  value  
                   environment:  'production'  
                   #  pound-­‐style  comment  
                   'server':  5  
           }  
    '''  
    !
    assert  conf.environment  ==  'production'  
    assert  conf.server  ==  5
    More tolerant parser: 

    single quotes, 

    non-quoted keys, 

    // and # comments,
    missing comas

    View Slide

  94. JsonSlurper for configuration files
    import  groovy.json.*  
    import  static  groovy.json.JsonParserType.*  
    !
    def  parser  =  new  JsonSlurper().setType(LAX)  
    !
    def  conf  =  parser.parseText  '''  
           //  configuration  file  
           {  
                   //  no  quote  for  key,  single  quoted  value  
                   environment:  'production'  
                   #  pound-­‐style  comment  
                   'server':  5  
           }  
    '''  
    !
    assert  conf.environment  ==  'production'  
    assert  conf.server  ==  5

    View Slide

  95. @YourTwitterHandle
    Markup
    template engine

    View Slide

  96. Markup template engine
    • Based on the principles of Groovy’s « builders »

    • and particularly the MarkupBuilder class

    for generating arbitrary XML / HTML payloads

    • Compiled statically for fast template rendering

    • Internationalization aware

    •provide the desired Locale in the configuration object

    •usual suffix notation template_fr_FR.tpl

    • Custom base template class

    •ability to provide reusable methods across your templates

    View Slide

  97. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }

    View Slide

  98. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }
    Your template

    View Slide

  99. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }
    model = [cars: [!
    new Car(make: 'Peugeot', name: '508'), !
    new Car(make: 'Toyota', name: 'Prius’)!
    ]]

    View Slide

  100. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }
    model = [cars: [!
    new Car(make: 'Peugeot', name: '508'), !
    new Car(make: 'Toyota', name: 'Prius’)!
    ]]
    Feed a model into
    your template

    View Slide

  101. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }
    model = [cars: [!
    new Car(make: 'Peugeot', name: '508'), !
    new Car(make: 'Toyota', name: 'Prius’)!
    ]]
    !
    !
    !

    View Slide

  102. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }
    model = [cars: [!
    new Car(make: 'Peugeot', name: '508'), !
    new Car(make: 'Toyota', name: 'Prius’)!
    ]]
    !
    !
    !

    Generate the
    XML output

    View Slide

  103. Markup template engine — the idea
    cars  {  
         cars.each  {  
                 car(make:  it.make,  name:  it.name)  
         }  
    }
    model = [cars: [!
    new Car(make: 'Peugeot', name: '508'), !
    new Car(make: 'Toyota', name: 'Prius’)!
    ]]
    !
    !
    !

    View Slide

  104. Markup template engine — in action
    import  groovy.text.markup.*  
    !
    def  config  =  new  TemplateConfiguration()  
    def  engine  =  new  MarkupTemplateEngine(config)  
    def  tmpl  =  engine.createTemplate('''  
           p("Hello  ${model.name}")  
    ''')  
    def  model  =  [name:  'World']  
    System.out  <<  tmpl.make(model)

    View Slide

  105. Markup template engine — includes
    //  include  another  template  
    include  template:  'foo.tpl'  
           
    //  include  raw  content  
    include  unescaped:  'raw.txt'  
    !
    //  escape  &  include  
    include  escaped:  'to_escape.txt'

    View Slide

  106. Markup template engine
    //  escaped  automatically  
    yield  'some  raw  content'  
    !
    //  include  raw  content  
    yieldUnescaped  'content'  
    !
    //    
    xmlDeclaration()                

    View Slide

  107. Markup template engine
    //  escaped  automatically  
    yield  'some  raw  content'  
    !
    //  include  raw  content  
    yieldUnescaped  'content'  
    !
    //    
    xmlDeclaration()                
    //    
    comment  'comment'                
    !
    //  adds  new  lines  
    newLine()                                
    !
    //  process.  instruct.  
    pi(/*  ...  */)                      

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  108. Markup template engine
    !
    • Configuration options

    !
    • declaration encoding

    !
    • expand empty
    elements

    !
    • use double quotes

    !
    • newline string

    !
    !
    !
    !
    !
    !
    !
    • auto escape

    !
    • auto indent

    !
    • base template class

    !
    • locale

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  109. Markup template engine — static!
    • Type-checked templates available

    • use createTypeCheckedModelTemplate() 

    instead of createTemplate()

    • Advantages

    • get compilation errors

    • if a variable is not available

    • if you make mistakes in the code snippets

    • even faster templates

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  110. Markup template engine — static!
    • With typed check model creation method

    !
    !
    !
    !
    • Or declare your model types in the template

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  111. Markup template engine — static!
    • With typed check model creation method

    !
    !
    !
    !
    • Or declare your model types in the template
    def  modelTypes  =  [cars:  "List"]  
    !
    def  tmpl  =  engine.  
       createTypeCheckedModelTemplate(

               "page.tpl",  modelTypes)

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  112. Markup template engine — static!
    • With typed check model creation method

    !
    !
    !
    !
    • Or declare your model types in the template
    def  modelTypes  =  [cars:  "List"]  
    !
    def  tmpl  =  engine.  
       createTypeCheckedModelTemplate(

               "page.tpl",  modelTypes)
    modelTypes  =  {  
           List  cars  
    }  
    !
    cars.each  {  car  -­‐>  
           p("Car  name:  $car.name")  
    }

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  113. Markup template engine — static!
    • With typed check model creation method

    !
    !
    !
    !
    • Or declare your model types in the template
    def  modelTypes  =  [cars:  "List"]  
    !
    def  tmpl  =  engine.  
       createTypeCheckedModelTemplate(

               "page.tpl",  modelTypes)
    modelTypes  =  {  
           List  cars  
    }  
    !
    cars.each  {  car  -­‐>  
           p("Car  name:  $car.name")  
    }
    Works with
    createTemplate() too

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  114. Markup template engine — static!
    • With typed check model creation method

    !
    !
    !
    !
    • Or declare your model types in the template
    def  modelTypes  =  [cars:  "List"]  
    !
    def  tmpl  =  engine.  
       createTypeCheckedModelTemplate(

               "page.tpl",  modelTypes)
    modelTypes  =  {  
           List  cars  
    }  
    !
    cars.each  {  car  -­‐>  
           p("Car  name:  $car.name")  
    }

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  115. @YourTwitterHandle
    Documentation
    overhaul

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  116. GroovyDoc

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  117. GroovyDoc

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  118. GroovyDoc

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  119. Groovy GDK documentation

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  120. Groovy GDK documentation

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  121. Brand new documentation

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  122. Future groovy-lang.org website

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  123. Future groovy-lang.org website

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  124. Future groovy-lang.org website

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  125. @YourTwitterHandle
    #DVXFR14{session
    hashtag}
    Groovy 3.0

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  126. View Slide

  127. @YourTwitterHandle
    MOP 2

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  128. Goals for the new MOP
    • Leverage & build upon JDK 7+ invoke dynamic

    • get Java-like performance even for dynamic code

    • Rationalize the sedimentation of meta-
    programming

    • more coherence, less corner cases & inconsistencies

    • Provide a notion of « realm »

    • shield users of « monkey patching »

    • finer-grained control of meta-programming reach

    • Private visibility anyone?

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  129. @YourTwitterHandle
    Antlr v4
    Grammar

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  130. Antlr v4 grammar
    • Problems
    • Groovy still uses Antlr v2!

    • but version 3 and 4 are out

    • Groovy’s grammar evolved from a Java grammar

    • harder to fix and evolve, especially with Antlr v2

    • Advantages
    • Start from a clean slate

    • Antlr 4 more tolerant 

    and powerful regarding ambiguities

    • Time to clean some grammar & syntax warts!

    • Need to implement the Java 8 constructs!

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  131. Antlr v4 grammar
    • Problems
    • Groovy still uses Antlr v2!

    • but version 3 and 4 are out

    • Groovy’s grammar evolved from a Java grammar

    • harder to fix and evolve, especially with Antlr v2

    • Advantages
    • Start from a clean slate

    • Antlr 4 more tolerant 

    and powerful regarding ambiguities

    • Time to clean some grammar & syntax warts!

    • Need to implement the Java 8 constructs!
    A « Google Summer of Code »
    student to help

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  132. @YourTwitterHandle
    Java 8
    support

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  133. Java 8 support
    • Additional grammar & semantic features to support

    • to keep saying Groovy / Java interoperability is awesome!

    • New in Java 8

    • lambdas

    • method references

    • default methods in interfaces

    • stream API, date / time API

    • annotations on types & repeated annotations

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  134. Java 8 support
    • Additional grammar & semantic features to support

    • to keep saying Groovy / Java interoperability is awesome!

    • New in Java 8

    • lambdas

    • method references

    • default methods in interfaces

    • stream API, date / time API

    • annotations on types & repeated annotations
    Groovy had already:
    closures, method pointers, mixins,
    enriched collection & time APIs

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  135. @YourTwitterHandle
    #DVXFR14{session
    hashtag}
    Summary

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  136. View Slide

  137. Groovy rocks the JVM 

    since 2003!

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  138. @YourTwitterHandle
    #DVXFR14{session
    hashtag}
    Q & A

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  139. Image credits / Creative Commons
    • Rue pavée — By-Nc-Sa

    • http://www.flickr.com/photos/22914687@N05/4957591422/sizes/l/

    • Sous la Tour Eiffel — By-Nc-Sa

    • http://www.flickr.com/photos/stewiedewie/244850735/sizes/l/in/photostream/

    • Sous le pont — By-Nc-Nd

    • http://www.landscape-photo.net/displayimage.php?pid=5194

    • Paris Metro - By-Nc-Sa

    • http://www.flickr.com/photos/22914687@N05/6317047263/sizes/l/

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