A Walkthrough of Groovy

AST Transformations

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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

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What are AST Transformations?

๏  Essentially byte code generation

๏  They enable compile-time metaprogramming

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

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Available in Groovy 1.7

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@Delegate

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@Singleton

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@Immutable

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@Category

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@Mixin

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@Grab

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@Synchronized

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@Lazy

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@Newify

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@Bindable (Vetoable)

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Available in Groovy 1.8

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@Log (@Commons @Log4j @Slf4j)

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@InheritConstructors

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@ToString

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@EqualsAndHashCode

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@TupleConstructor

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@Canonical

๏  Merges @ToString, @EqualsAndHashCode and @TupleConstructor

๏  Allows specific tweaks per annotation

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@IndexedProperty

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And there are many more…

๏  @AutoClone

๏  @AutoExternalize

๏  @ConditionalInterrupt @TimedInterrupt @ThreadInterrupt

๏  @PackageScope

๏  @WithReadLock @WithWriteLock

๏  @Field

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Found in other projects

๏  . ‣ @Entity

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

๏  Modules ‣ @Scalify ‣ @Bytecode

๏  Groovy++ ‣ @Typed

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Thank you!

twitter: @aalmiray