Apache Groovy's Metaprogramming Options and You
summary
Three new Groovy releases land (3.0.7, 2.5.14, 2.4.21) and Groovy 4 changes package namespaces, breaking binary compatibility. Runtime metaprogramming uses MetaClass MOP to add methods, plus methodMissing/propertyMissing, categories, mixins, traits and extension modules that are IDE-aware and type-checked. Compile-time uses AST transformations (local and global), with ~70 built-ins like ToString, Canonical, Immutable and a Pojo prototype that emits plain JVM bytecode; macro methods and ASTBuilder generate code programmatically.
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chapters (15)
- 0:00Introduction to Groovy
- 1:31What is metaprogramming
- 2:55Runtime metaprogramming basics
- 7:09Method missing in Groovy
- 9:18Categories and mixins
- 12:52Traits in Groovy
- 14:17Extension modules
- 18:06Compile-time metaprogramming
- 19:52AST transformations
- 23:46Canonical transformation
- 24:50Immutable classes in Groovy
- 26:14Groovy and Project Lombok
- 28:00Global AST transformations
- 29:03Macro methods
- 30:26Resources and contributions
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