Runtime Metaprogramming With Groovy
summary
Covers Groovy runtime metaprogramming with concrete examples: implements an Expando via a Map using setProperty/getProperty and methodMissing and propertyMissing, shows closures’ delegate first/owner first resolve strategies and how MarkupBuilder and Grails constraints use closure delegates to build DSLs, demonstrates adding methods to java.lang.String with metaClass and per‑instance metaClass, explains ExtensionModule via META-INF/services/org.codehaus.groovy.runtime.ExtensionModule to add methods to classes, shows traits (compile‑time and withTraits runtime proxy), and notes performance tradeoffs and compileStatic limits.
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chapters (12)
- 0:00Introduction to metaprogramming
- 1:14Understanding MOP hooks
- 6:12Implementing the expando class
- 13:36Advanced dynamic method handling
- 21:45Closures and delegation
- 32:27DSL creation with delegates
- 39:16Property and method interception
- 42:55Runtime meta-class modification
- 52:19Metaprogramming caveats
- 58:24Groovy module extensions
- 1:09:03Traits in Groovy
- 1:24:32Performance and best practices
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