1. Code generation: Going all the way Rafael Chaves [email_address] http://alphasimple.com

2. Defining "code generation"

4. Step 1: basic code generation from models

6. package banking; public class Account { private Double balance; public Double getBalance() { return this.balance; } public void setBalance(Double balance) { assert balance != null; this.balance = balance; } public void deposit(Double amount) { /* FILL ME IN */ } public void withdraw(Double amount) { /* FILL ME IN */ } }

8. Step 2: using protected regions

9. package banking; public class Account { private Double balance; public Double getBalance() { return this.balance; } public void setBalance(Double balance) { assert balance != null; this.balance = balance; } public void deposit(Double amount) { //BEGIN-USER-CODE this.balance = this.balance + amount; //END-USER-CODE } ... }

11. Step 3: applying the Generation Gap pattern

12. Source: IBM Research

13. // GENERATED - DO NOT MODIFY package banking; public class AccountCore { protected Double balance; public Double getBalance() { return this.balance; } public void setBalance(Double balance) { assert balance != null; this.balance = balance; } public void deposit(Double amount) { // override me } public void withdraw(Double amount) { // override me } }

14. package banking; public class Account extends AccountCore { public void deposit(Double amount) { this.balance = this.balance + amount; } public void withdraw(Double amount) { this.balance = this.balance - amount; } }

16. What problem are we trying to solve again?

17. Enterprise software is much harder than it should be Problem domains are typically not very complex (information management + business rules) How come? Secondary concerns abound persistence, concurrency, (a)synchronism, distribution, transactions, security, caching, replication, logging, ...

19. Problem hypothesis: lack of separation between technical and domain concerns is the root of all evil

20. Solutions Using ordinary 3GL + reflection/AOP Model-driven development with DSLs Model-driven development with a GPL (like UML)

23. Solution hypothesis: Model-driven development with a GPL and full code generation

26. Demo: Executable modeling and full code generation with AlphaSimple

27. Validating hypotheses

29. Model-driven development is not about taking work (or fun) away from developers, but making their work more meaningful and valuable

30. Code generation: Going all the way Rafael Chaves [email_address] http://alphasimple.com