Groovy State of the Union — GR8Conf Europe 2015

Transcript

1. State of
   the Union
   Guillaume Laforge
   @glaforge
   Restlet — the Web API platform
   Groovy project team
   

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2. We know
   about
   APIs!
   

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3. STATE
   OF THE
   UNION
   

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5. GR8Conf Promo Code: cfgr8eu39
   http://www.manning.com/koenig2/
   GROOVY
   IN ACTION
   2ND EDITION
   

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6. A look back at
   the past 6 months
   

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7. FIRED!
   

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8. MARCH
   31st
   

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9. MARCH
   31st
   RELEASE
   GROOVY 2.4
   GRAILS 3.0
   

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11. What could
    possibly go
    wrong?
    

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13. THE CODEHAUS
    DEMISE
    

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14. IMPACT?
    

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15. 2012 2013 2014 2015
    Downloads
    

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16. 2012 2013 2014 2015
    1.7M
    3M
    4.5M ?
    Downloads
    

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17. 2.1 MILLIONS
    FOR FIRST 4 MONTHS
    OF 2015
    

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18. MAVEN
    CENTRAL
    ONLY
    

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19. MAVEN
    CENTRAL
    ONLY
    +CODEHAUS
    LEGACY
    

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20. MAVEN
    CENTRAL
    ONLY
    +CODEHAUS
    LEGACY
    +BINTRAY
    

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21. GROOVY
    2.4
    

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22. 15
    Groovy 2.4 — Android support
    • Write your Android applications
    fully in Groovy!
    • Dedicated Gradle plugin
    

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23. 15
    Groovy 2.4 — Android support
    • Write your Android applications
    fully in Groovy!
    • Dedicated Gradle plugin
    

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24. 16
    Groovy 2.4 — Android support
    SwissKnife

    a dedicated 

    Groovy / Android 

    library
    

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25. 17
    Groovy 2.4 — Performance & bytecode
    • Improved bytecode
    • cheaper comparison operations
    • optimization of primitive type coercions with ‘as’
    • Reduced bytecode size
    • no MOP generated methods in static context
    • uneeded inner class distributor methods when no inner
    • timestamp removal
    • Reduced memory consumption
    

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26. 18
    Groovy 2.4 — Traits @SelfType
    class Component {

    void doSomething() {

    println "Done!"

    }

    }
    

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27. 18
    Groovy 2.4 — Traits @SelfType
    class Component {

    void doSomething() {

    println "Done!"

    }

    }
    import groovy.transform.*
    

    @SelfType(Component)

    @TypeChecked

    trait ComponentDecorator {

    void logAndDoSomething() {

    println "Going to do something"

    doSomething()

    }

    }
    

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28. 18
    Groovy 2.4 — Traits @SelfType
    class Component {

    void doSomething() {

    println "Done!"

    }

    }
    import groovy.transform.*
    

    @SelfType(Component)

    @TypeChecked

    trait ComponentDecorator {

    void logAndDoSomething() {

    println "Going to do something"

    doSomething()

    }

    }
    class ConcreteComponent

    extends Component

    implements ComponentDecorator {}

    

    def c = new ConcreteComponent()

    c.logAndDoSomething()
    

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29. 19
    Groovy 2.4 — GDK improvements
    • New methods
    • System.currentTimeSeconds()
    • List: removeAt(index), getIndices()
    • Collection: removeElement(Object)
    • Iterable: disjoin(), size(), dropRight(),
    takeRight()
    • More collection methods moved to iterator-based
    • Favor stream-like traversal methods leveraging iterables
    • Consistency for mutation in place vs new collection creation
    

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30. 20
    Groovy 2.4 — AST transformations
    • @ToString added includeSuperProperties parameter
    • Can define compilation phase for @ASTTest
    • @Synchronized supports explicit static locks used by
    instance methods if needed
    • Cleaned-up code for @AutoExternalizable and
    @EqualsAndHashCode when used with @CompileStatic
    • Improved Java integration for @Builder
    • @PackageScope allowed on constructors
    

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31. 21
    Groovy 2.4 — Groovysh improvements
    • Custom .rc and .profile scripts
    • instanceof completion
    • Static members completion only in a static context
    • Completion candidates in color
    • :set interpreterMode to remember locally-defined variables
    • :load command supports file names with spaces
    • Align arguments & flags with the groovy command
    • Script launch on startup & continue execution of Groovysh
    • Easier to subclass Groovysh for embedded reuse
    

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32. And now, what’s next?
    

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33. MUSICAL
    CHAIRS
    

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34. GRAILS
    GROOVY
    CEDRIC
    GUILLAUME
    JOCHEN LARI
    JEFF
    GRAEME
    ?
    

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35. GRAILS
    GROOVY
    CEDRIC
    GUILLAUME
    JOCHEN
    LARI
    JEFF
    GRAEME
    ?
    

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37. MESSAGE TO THE
    COMMUNITY
    

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38. HERE TO
    STAY
    

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39. HERE TO
    STAY
    INDEPENDENCE
    

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40. HERE TO
    STAY
    COMMUNITY
    ABOVE ALL
    INDEPENDENCE
    

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41. APACHE
    INCUBATOR
    

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42. APACHE
    INCUBATOR
    MARCH
    24TH
    

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43. 29
    Incubation — mentors
    • Emmanuel Lécharny
    • Bertrand Delacrétaz
    • Roman Shaposhnik
    • Jim Jagielski
    • Andrew Bayer
    

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44. 30
    Incubation — initial committers
    • Paul King
    • Cédric Champeau
    • Pascal Schumacher
    • Jochen Theodorou
    • Guillaume Laforge
    

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45. 31
    Incubation — infrastructure
    • Mailing-lists created
    • please don’t use the old ones!
    • JIRA issues imported
    • Sources moved to Apache’s Git
    • with a mirror on Github
    Please
    Star it!
    

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46. 32
    Incubation — new committers
    • Officially joined the project as committer
    • Andrés Almiray
    • To be announced soon too!
    • Dierk König
    • Russel Winder
    

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47. 33
    Incubation — next steps
    • The next key step is make a first release!
    • following the Apache guidelines
    

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48. Little nuggets to come…
    For Groovy 2.4.4
    and Groovy 2.5
    

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49. 35
    @Canonical becomes a meta-annotation
    import groovy.transform.*

    

    @Canonical(includeNames = true)

    class Person {

    String name

    int age

    }

    

    assert new Person('Guillaume', 37).toString() ==

    'Person(name:Guillaume, age:37)'
    

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50. 35
    @Canonical becomes a meta-annotation
    import groovy.transform.*

    

    @Canonical(includeNames = true)

    class Person {

    String name

    int age

    }

    

    assert new Person('Guillaume', 37).toString() ==

    'Person(name:Guillaume, age:37)'
    includeNames
    from @ToString
    

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51. 36
    More control on annotation collector
    DUPLICATE
    Annotations from the annotation
    collection will always be inserted.
    PREFER_COLLECTOR
    Annotations from the collector will be
    added and any existing annotations with
    the same name will be removed.
    PREFER_EXPLICIT
    Annotations from the collector will be
    ignored if any existing annotations with
    the same name are found.
    PREFER_EXPLICIT_MERGED
    Annotations from the collector will be
    ignored if any existing annotations with
    the same name are found but any new
    parameters on the collector annotation
    will be added to existing annotations.
    PREFER_COLLECTOR_MERGED
    Annotations from the collector will be
    added and any existing annotations with
    the same name will be removed but any
    new parameters found within existing
    annotations will be merged into the
    added annotation.
    

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52. 37
    New @MapConstructor transformation
    import groovy.transform.*

    

    @TupleConstructor

    class Person {

    String first, last

    }

    

    @CompileStatic // optional

    @ToString(includeSuperProperties = true)

    @MapConstructor(pre = { super(args?.first, args?.last);

    args = args ?: [:] },

    post = { first = first?.toUpperCase() })

    class Author extends Person {

    String bookName

    }
    assert new Author(first: 'Dierk',
    last: 'Koenig',
    bookName: 'ReGinA').toString() ==
    'Author(ReGinA, DIERK, Koenig)'

    

    assert new Author().toString() ==
    'Author(null, null, null)'
    

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53. 37
    New @MapConstructor transformation
    import groovy.transform.*

    

    @TupleConstructor

    class Person {

    String first, last

    }

    

    @CompileStatic // optional

    @ToString(includeSuperProperties = true)

    @MapConstructor(pre = { super(args?.first, args?.last);

    args = args ?: [:] },

    post = { first = first?.toUpperCase() })

    class Author extends Person {

    String bookName

    }
    assert new Author(first: 'Dierk',
    last: 'Koenig',
    bookName: 'ReGinA').toString() ==
    'Author(ReGinA, DIERK, Koenig)'

    

    assert new Author().toString() ==
    'Author(null, null, null)'
    Can decorate map
    ctor with pre / post-
    instructions
    

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54. 38
    Properties validated in AST xforms
    import groovy.transform.AutoClone

    

    @AutoClone(excludes = 'sirName')

    class Person {

    String firstName

    String surName

    }

    

    new Person(firstName: "John",
    surName: "Doe").clone()
    

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55. 38
    Properties validated in AST xforms
    import groovy.transform.AutoClone

    

    @AutoClone(excludes = 'sirName')

    class Person {

    String firstName

    String surName

    }

    

    new Person(firstName: "John",
    surName: "Doe").clone()
    Error during @AutoClone
    processing: 'excludes'
    property 'sirName'
    does not exist.
    

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56. 39
    Prevent @TupleConstructor default ctors
    @TupleConstructor

    class Person {

    String first, last

    int age

    }
    

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57. 39
    Prevent @TupleConstructor default ctors
    @TupleConstructor

    class Person {

    String first, last

    int age

    }
    Generates:
    Person(String first, String last, int age) { /*...*/ }
    Person(String first, String last) { this(first, last, 0) }
    Person(String first) { this(first, null) }
    Person() { this(null) }
    

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58. 40
    Prevent @TupleConstructor default ctors
    @TupleConstructor(defaults = true)

    class Person {
    String first, last

    int age

    }
    

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59. 40
    Prevent @TupleConstructor default ctors
    @TupleConstructor(defaults = true)

    class Person {
    String first, last

    int age

    }
    Generates only:
    Person(String first, String last, int age) { /*...*/ }
    

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60. 41
    @Immutable support in class hierarchy
    import groovy.transform.*

    

    @EqualsAndHashCode

    class Person {

    String name

    }
    

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61. 41
    @Immutable support in class hierarchy
    import groovy.transform.*

    

    @EqualsAndHashCode

    class Person {

    String name

    }
    @Immutable

    @TupleConstructor(includeSuperProperties = true)

    @EqualsAndHashCode(callSuper = true)

    @ToString(includeNames = true, includeSuperProperties = true)

    class Athlete extends Person {

    String sport

    }
    

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62. 41
    @Immutable support in class hierarchy
    import groovy.transform.*

    

    @EqualsAndHashCode

    class Person {

    String name

    }
    @Immutable

    @TupleConstructor(includeSuperProperties = true)

    @EqualsAndHashCode(callSuper = true)

    @ToString(includeNames = true, includeSuperProperties = true)

    class Athlete extends Person {

    String sport

    }
    def d1 = new Athlete('Michael Jordan', 'BasketBall')

    def d2 = new Athlete(name: 'Roger Rederer', sport: ‘Tennis')
    assert d1 != d2

    assert d1.toString() == 

    'Athlete(sport:BasketBall, name:Michael Jordan)'

    assert d2.toString() == 

    'Athlete(sport:Tennis, name:Roger Rederer)'
    

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63. 42
    Miscellaneous
    • GDK’s createSimilarCollection() and
    createSimilarMap() methods support all the JDK’s
    collections and maps
    • Improve compiler performance with an ASM class reader
    instead of using a class loader
    • New File#relativePath(file) method
    

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64. Thanks for your attention!
    

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65. Questions & Answers
    

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