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Lingu. A light weight language for critical data processing. Agenda. Brief Description Current Goal System Design Progress Conclusion. Background. Many organizations run mission critical data processing application. Validation & testing is very critical in such application.
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Lingu A light weight language for critical data processing
Agenda • Brief Description • Current Goal • System Design • Progress • Conclusion
Background • Many organizations run mission critical data processing application. • Validation & testing is very critical in such application. • In practice, testing is considered an extra burden to the programmer. • Most languages don’t treat validation & testing as an integral part of programming.
The Idea • The idea is to enforce validation and testing to programmer. • This is done by embedding validation script on the programming language. • Lingu is created based on the idea above.
Lingu • A Lightweight language to program data transformation on database. • High level Language. • Small → Simplifies Lingu's internal logic and the verification of Lingu's programs. • Sufficient construct to program a large class of useful data transformations. • Built-in feature to generate random inputs and to report the test results (validation).
Case Study • The prototype development is based on “Agenda & Appointment” sample from Lingu script on RUTI Midterm Report July 2004.
Lingu Class type Agenda = Dbase {| Old :: Table Appointment ; Main :: Table Appointment |} type Appointment = Record {| Date :: Date ; Priority :: Integer ; Note :: String |} class AgendaUtility (a :: Agenda) method cleanup (d::Date) :: () do { insertAll x<-a.Main where x.Date<=d to a.Old ; delete m<-a.Main where x.Date<=d } method emptyOld () :: () do a.Old := <| |>
Lingu Validation Script validation test1 (i::Integer; d::Date) :: Bool local x :: Appointment ; b1,b2 :: Bool do { x := a.Main!!i ; call cleanup(d) ; b1 := find x' <- a.Main where x' = x found T otherwise F ; b2 := find x' <- a.Old where x' = x found T otherwise F } return (b1 \/ b2) pre 0 <= i /\ i < #a.Main post return=T scenario test1(0,currentDate()) ; test1(#a.Main-1,currentDate()) ; test1(#a.Main,currentDate())
Current Goal • Develop a working prototype based on Java programming language • Functionality : • Interpreter and Syntax Checker for Lingu • Connection Database, Lingu-SQL translator • Database test generator • Compiler is not included
Syntax Checker • Inspecting the syntax of Lingu script based on the grammar. • The EBNF grammar is created from the case study script. • Status : In progress, basic functionality.
type Agenda = Dbase {| Old :: Table Appointment ; Main :: Table Appointment |} public class Agenda { private Appointment[] Old; private Appointment[] Main; public void setOld(Appointment[] Old) { this.Old = Old; } public void setMain(Appointment[]Main) { this.Main = Main; } public Appointment[] getOld() { return this.Old; } public Appointment[] getMain() { return this.Main; } } Lingu Class Translator • Translating Lingu Classes to Java Classes
Lingu Class Translator • Status : In progress, limited to the sample script
Lingu-Java Interpreter • Parsing and executing the Lingu script in a database environment. • Extract the script into a parse tree using JJTree.
Parse Tree validation test1 (i::Integer; d::Date) :: Bool local x :: Appointment ; b1,b2 :: Bool do { x := a.Main!!i ; call cleanup(d) ; . . . }
Validation Test1 Param Body Return bool i d integer date Declaration Assignment x B1 B2 appointment bool bool Parse Tree
Lingu-Java Interpreter • Some of the functionality is hard-coded for prototyping purpose. • Status : In progress, 60 %
Database Connection • Handling the communication from interpreter to the database. • Database connection using JDBC and MySQL as the database server. • Database conenction functionality is limited to CRUD (Create,Update,Delete) operation. • Status : In progress
Test Generator • Automatically populate the database with random inputs for validation purpose. • Random inputs structure is according to the Lingu class. • Test Generator development is currently being started.
Afterwords • Lingu is a work in progress. • The real Lingu is implemented with attribute grammar. • The work is not final, it is open to criticsm and suggestion.
