A Walkthrough of Groovy AST Transformations

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Andres Almiray

Technology Education

A Walkthrough
of Groovy
AST Transformations

About the speaker
๏  Java developer since the beginning

๏  True believer in Open Source

๏  Groovy committer since 2007

๏  Project lead of the Griffon framework

๏  Currently working for

www.canoo.com 2

What are AST Transformations?

๏  Essentially byte code generation

๏  They enable compile-time metaprogramming

๏  Groovy has two types of AST transformations: global and local

www.canoo.com 3

@Log (@Commons @Log4j @Slf4j)

www.canoo.com 16

@Canonical

๏  Merges @ToString, @EqualsAndHashCode and @TupleConstructor

๏  Allows specific tweaks per annotation

www.canoo.com 21

And there are many more…

๏  @AutoClone

๏  @AutoExternalize

๏  @ConditionalInterrupt @TimedInterrupt @ThreadInterrupt

๏  @PackageScope

๏  @WithReadLock @WithWriteLock

๏  @Field

www.canoo.com 23

Found in other projects

๏  .
‣  @Entity

๏  .
‣  @EventPublisher
‣  @Listener
‣  @Entity
‣  @Scaffold

๏  Modules
‣  @Scalify
‣  @Bytecode

๏  Groovy++
‣  @Typed
www.canoo.com 24

http://people.canoo.com/share

www.canoo.com 25

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A Walkthrough of Groovy AST Transformations

1. A Walkthrough of Groovy AST Transformations

2. About the speaker ๏  Java developer since the beginning ๏  True believer in Open Source ๏  Groovy committer since 2007 ๏  Project lead of the Griffon framework ๏  Currently working for www.canoo.com 2

3. What are AST Transformations? ๏  Essentially byte code generation ๏  They enable compile-time metaprogramming ๏  Groovy has two types of AST transformations: global and local www.canoo.com 3

4. Available in Groovy 1.7 www.canoo.com

5. @Delegate www.canoo.com 5

6. @Singleton www.canoo.com 6

7. @Immutable www.canoo.com 7

8. @Category www.canoo.com 8

9. @Mixin www.canoo.com 9

10. @Grab www.canoo.com 10

11. @Synchronized www.canoo.com 11

12. @Lazy www.canoo.com 12

13. @Newify www.canoo.com 13

14. @Bindable (Vetoable) www.canoo.com 14

15. Available in Groovy 1.8 www.canoo.com

16. @Log (@Commons @Log4j @Slf4j) www.canoo.com 16

17. @InheritConstructors www.canoo.com 17

18. @ToString www.canoo.com 18

19. @EqualsAndHashCode www.canoo.com 19

20. @TupleConstructor www.canoo.com 20

21. @Canonical ๏  Merges @ToString, @EqualsAndHashCode and @TupleConstructor ๏  Allows specific tweaks per annotation www.canoo.com 21

22. @IndexedProperty www.canoo.com 22

23. And there are many more… ๏  @AutoClone ๏  @AutoExternalize ๏  @ConditionalInterrupt @TimedInterrupt @ThreadInterrupt ๏  @PackageScope ๏  @WithReadLock @WithWriteLock ๏  @Field www.canoo.com 23

24. Found in other projects ๏  . ‣  @Entity ๏  . ‣  @EventPublisher ‣  @Listener ‣  @Entity ‣  @Scaffold ๏  Modules ‣  @Scalify ‣  @Bytecode ๏  Groovy++ ‣  @Typed www.canoo.com 24

25. http://people.canoo.com/share www.canoo.com 25

26. Thank you! twitter: @aalmiray

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