Groovy MOPping
summary
Groovy MOP techniques show how to synthesize methods at runtime, intercept calls with invokeMethod and methodMissing, and inject behavior into existing classes (even java.lang.Long) using ExpandoMetaClass and categories; examples include a transactional AST transformer that wraps methods and a Grape-backed script that pulls jars at runtime. Code uses ExpandoMetaClass, AST transformations, and Spock tests to prove behavior; static type checking (Groovy 2.0 @TypeChecked) is optional. Example tests mostly pass and demonstrate real runtime changes and compiled transforms.
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chapters (6)
- 0:00Introduction
- 13:55What is MOP in Groovy
- 29:15Missing methods and synthesis
- 35:17ST transformations in Groovy
- 48:36Groovy MOP in real tasks
- 50:44Conclusion and Q&A
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