Metaprogramming with JavaParser

on YouTube ↗47m

" summary

Metaprogramming gets concrete here: DRL rule files are transpiled into Java source (a compiled DRL → Java DSL) using JavaParser so Drools avoids heavy reflection and cuts startup time — the team reports handling up to a million rules at load-time by emitting bytecode ahead-of-time. Live demos use JShell as an eval host and show JavaParser AST transformations that replace placeholders and types, generate methods reliably, and enable running Drools on Quarkus/GraalVM AOT successfully.

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" chapters (13)

1. 0:00Start
2. 1:13What Is Meta Programming
3. 5:58Java Parser
4. 6:27Business Rule Management System
5. 7:02Business Rules
6. 7:15Truce Rules Language
7. 13:38What Is Source Code
8. 27:20Binary Expression
9. 32:00Abstract Syntax Tree
10. 33:46Generics
11. 40:44Java Syntax Specifications
12. 41:33Api To Generate if Statement
13. 43:36Partial Evaluation

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