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A Groovy journey in Open Source -- Greach 2016

A Groovy journey in Open Source -- Greach 2016

Guillaume Laforge

April 08, 2016
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  1. Bob McWhirter James Strachan James Strachan and Bob McWhirter gave

    birth to Groovy: a dynamic and agile scripting language for the JVM. […] James always used to say that it was all Bob's fault, but indeed, James had so many groovy ideas that it's hard to believe it's not his own fault. He kept saying: "Wouldn't it be groovy if we could do this and that...". Hence the name "Groovy". That's roughly how it all started.
  2. 8 Groovy pre-1.0 • Closures available since 2003 on Java

    1.4+ • All the nice shortcuts already, inspired by Python & Ruby • native syntax for lists, maps, etc… • Tons of useful methods to simplify 
 common Java boiler-plate code • Initially dynamically-typed only
  3. I join the project in 2003, patches after patches, become

    committer, then lead when founders left
  4. 5

  5. 12 Groovy in 2004 • A brand new parser based

    on Antlr • after two hand-rolled versions • by John Rose and Jeremy Rainer • Jochen « blackdrag » Theodorou joins the project
  6. 6

  7. 18 First paid committer • Jochen becomes the first full-time

    paid committer • sponsored by BigSky Technologies / No Fluff Just Stuff
  8. 1.0

  9. 25 Groovy in 2007 — Groovy 1.5 • The long

    awaited Java 5 update • annotations, enums, generics… • Joint compiler! • Varargs support • Static imports (including import aliasing) • Named parameters without parentheses
  10. 31 Groovy++ fork! • Not the first fork, but 3rd

    • by Alex Tkachman (former G2One co-founder) • Big focus on static compilation • interesting playground for our forthcoming static type checking and static compilation support
  11. I can honestly say if someone had shown me the

    Programming Scala book back in 2003, I’d probably have never created Groovy
  12. 41 Groovy 1.6 • Performance improvements with call-site caching •

    Multiple assignments • Optional return in if/else, try/catch, switch/case • More AST transformations • @Singleton, @Lazy, @Immutable, @Delegate • The Grape module system with @Grab • OSGi support
  13. 42 Groovy 1.7 • Nested and inner classes, and nested

    static classes • Missing annotation definition support • Power Asserts from Spock • Customize the Groovy Truth! • AST viewer and AST builder • SQL support improvements
  14. 7

  15. 49 Groovy 1.8 • Command chain expressions • GPars bundled

    with the Groovy distribution • Primitive calculation optimizations • Closures • as annotation parameters • currying, memoization and tail recursion • Built-in JSON support
  16. 54 Groovy 2.0 • Static type checking and static compilation

    • type inference, flow typing… • « Project Coin » enhancements • binary literals, underscore in numbers, multicatch block • Initial « invoke dynamic » support • Modularity of the Groovy code base with modules
  17. 58 Groovy 2.1 • Full « invoke dynamic » support

    • Type-checking extensions • Meta-annotations • @DelegatesTo annotation • Compiler customization scripts • Distribution bundling GPars 1.0
  18. 59 Groovy 2.2 • Implicit closure coercion to SAM types

    • Java lambda friendly! • Pre-compiled type checking extensions • @Memoized transformations for methods
  19. 8

  20. 63 Groovy 2.3 • Traits! • Improved JDK 8 support

    • Drastic performance improvement for JSON • New AST transformations & improvements • @Builder,@Sortable,@SourceURI, @BaseScript • New markup template engine • More NIO support
  21. 77 Groovy 2.4 — Android support • Write your Android

    applications fully in Groovy! • Dedicated Gradle plugin
  22. 77 Groovy 2.4 — Android support • Write your Android

    applications fully in Groovy! • Dedicated Gradle plugin
  23. 79 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
  24. 80 Groovy 2.4 — Traits @SelfType class Component {
 void

    doSomething() {
 println "Done!"
 }
 }
  25. 80 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()
 }
 }
  26. 80 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()
  27. 81 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
  28. 82 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
  29. 83 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
  30. 91 Incubation — mentors • Emmanuel Lécharny • Bertrand Delacrétaz

    • Roman Shaposhnik • Jim Jagielski • Andrew Bayer
  31. 92 Incubation — initial committers • Paul King • Cédric

    Champeau • Pascal Schumacher • Jochen Theodorou • Guillaume Laforge
  32. 93 New committers • Joined the project as committer afterwards

    • Andrés Almiray • Dierk König • Russel Winder • Shil Sinha • Graeme Rocher • John Wagenleitner
  33. 94 Infrastructure • Everything migrated to the Apache infrastructure •

    Mailing-lists • JIRA • Sources moved to Apache’s Git • with a mirror on Github • Still need to see what we do 
 with the groovy-lang.org website Please Star it!
  34. 95 Top Level Project at Apache! • PMC & Incubator

    PMC voted for graduation • Apache Board agreed to the graduation! • (last November) • Call us Apache Groovy :-) • 2.4.6 was released on February 2016
  35. 96 Entering the TIOBE index • 3 months in a

    row in the top-20 TIOBE index • 17th for January • 20th for February • 17th for March
  36. 98 Groovy 2.4.4/5/6 / 2.5 • Improved compiler performance •

    with an ASM class reader • @Canonical becomes a meta-annotation • More control on the meta-annotation collector • New @MapConstructor transformation • Property validation in transformation parameters • Further AST transformation improvements
  37. 99 @Canonical becomes a meta-annotation import groovy.transform.*
 
 @Canonical(includeNames =

    true)
 class Person {
 String name
 int age
 }
 
 assert new Person('Guillaume', 38).toString() ==
 'Person(name:Guillaume, age:38)'
  38. 99 @Canonical becomes a meta-annotation import groovy.transform.*
 
 @Canonical(includeNames =

    true)
 class Person {
 String name
 int age
 }
 
 assert new Person('Guillaume', 38).toString() ==
 'Person(name:Guillaume, age:38)' includeNames from @ToString
  39. 100 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.
  40. 101 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)'
  41. 101 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
  42. 102 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()
  43. 102 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.
  44. 103 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) }
  45. 104 Prevent @TupleConstructor default ctors @TupleConstructor(defaults = true)
 class Person

    { String first, last
 int age
 } Generates only: Person(String first, String last, int age) { /*...*/ }
  46. 105 @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
 }
  47. 105 @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 Federer', sport: ‘Tennis') assert d1 != d2
 assert d1.toString() == 
 'Athlete(sport:BasketBall, name:Michael Jordan)'
 assert d2.toString() == 
 'Athlete(sport:Tennis, name:Roger Federer)'
  48. 106 Miscellaneous • GDK’s createSimilarCollection() and createSimilarMap() methods support all

    the JDK’s collections and maps • New File#relativePath(file) method