“Modelos para que vos quero” ou “ Web Application Maker: a declarative web database tool” Miguel Calejo, Mário Araújo Declarativa, Portugal

Apresentação em tema: "“Modelos para que vos quero” ou “ Web Application Maker: a declarative web database tool” Miguel Calejo, Mário Araújo Declarativa, Portugal"— Transcrição da apresentação:

1 “Modelos para que vos quero” ou “ Web Application Maker: a declarative web database tool” Miguel Calejo, Mário Araújo Declarativa, Portugal http://www.declarativa.com

2 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 2 Plan for today Romantic vision and “real world” impact About WAM –WAM principles –An example –Meta-model editing –Real apps grow beyond models –Another example, “business story” Conclusion

3 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 3 Vision Goal (1990-2010) –Telepathic specifications –Instantaneous development –Continuous fixing/adapting; only dead apps are “done” Getting there (2000-2005) –There may be lots of tiers in an application......but there’s always a relational back-end –Pick a decent one to start: MS SQL Server A word about PROLOG and XSB Inc.’s XJ –Cut the crap, focus on the problem, apply GUI patterns –Ride on Moore’s Law: don’t generate, interpret Will it work?

4 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 4 WAM projects: DoD/XSB, Inc. Front-end to a “knowledge warehouse” for the largest part DB in the world 27 tables, 110 hours Currently in beta program

5 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 5 WAM projects: CVRVV VVSHOP, VVROUTE, DCPonline, PAS, PS/SC, Gestão de notícias, Rotulagem, Contactos, iLab (LIMS), Receitas verdes, OLAP front-end, Boas Vinhas,...

6 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 6 WAM projects: Servisoft Custom “ERP” 60+ tables, 4000 hours In use since Nov 2001

7 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 7 Today’s plan (progress) Romantic vision and “real world” impact  About WAM –WAM principles –An example –Meta-model editing –Real apps grow beyond models –Another example, “business story” Conclusion

8 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 8 More WAM projects XSB Inc. –XT: time billing and project management CCDR-N –repository for all Information Systems CRAT –Image database, crafts shop, invoicing, etc About 18 applications, including several “medium-sized” critical web ISs

9 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 9 Spaghetti code in the internet era

10 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 10 More declarative scenario

11 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 11 Enter: declarative web development Web Application Maker (WAM) –Model-driven, based on SQL Server –Given a DB schema with triggers, constraints, etc... –...get web interface with user profiles, etc. –Flexible: GUI generators exposed to the developer Follow any software engineering method,.... –...and use the resulting database Part of Declarativa’s Web Information Systems Toolkit

12 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 12 The WAM picture

13 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 13 WAM “Equations” Web interface = WAM(DB Meta Information + WAMmodel) + CustomASP pages using WAM objects + other pages Default web interface = WAM(DB Meta Inf. + Default WAMmodel) An acceptable and easy-to-change interface working sooner is much better than a fancy one later!

14 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 14 WAMmodel Information added to the database schema to allow generation of a reasonable GUI instance –WAM_PRESENTATION –WAM_LIST, WAM_LIST_COLUMN –WAM_LOOKUP_COLUMN –WAM_PROCEDURE_CALL –...10 tables total Strongly tied to the relational meta-model Non-redundant

15 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 15 WAM: a web GUI fragment factory for... Entry page (Regular) Lists, List columns Detail lists –Stand-alone –Embbeded Search Criteria Rows, Row fields, Lookup fields Context path, procedure callers, error reporting

16 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 16 GUI fragment example: lookups

17 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 17 Today’s plan (progress) Romantic vision and “real world” impact  About WAM –WAM principles  –An example –Meta-model editing –Real apps grow beyond models –Another example, “business story” Conclusion

18 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 18 Demo – “Northwind” database

19 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 19 Entry page A default entry page, with all lists plus direct navigation to “interesting” tables Uses WAM_TABLE_GROUP

20 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 20 A user-configurable list Automatic joins, both detail  master and master  detail

21 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 21 Row with embedded list and 3 LKs

22 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 22 Relational navigation extreme

23 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 23 Today’s plan (progress) Romantic vision and “real world” impact  About WAM –WAM principles  –An example  –Meta-model editing –Real apps grow beyond models –Another example, “business story” Conclusion

24 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 24 Editing the WAMmodel SQL client tools, or... WAMAdmin –A WAM application –Standard lists and rows for all WAMmodel tables –Some utilities WAMmodel/DB consistency checking, DB dependency extractor, etc. –Complemented by runtime “edition mode”, adequate for administrators/power users –Try it at http://showroom.declarativa.com

25 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 25 WAMAdmin

26 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 26 Editing the WAMmodel for a row

27 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 27 Editing a WAMmodel tuple

28 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 28 Today’s plan (progress) Romantic vision and “real world” impact  About WAM –WAM principles  –An example  –Meta-model editing  –Real apps grow beyond models –Another example, “business story” Conclusion

29 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 29 Back to the WAM equations So far we’ve seen... Web interface = WAM(DB Meta Information + WAMmodel) + Custom ASP pages using WAM objects + other pages Default web interface = WAM(DB Meta Inf. + Default WAMmodel)

30 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 30 Customized ASPs:WAM API Single DB dependence. Custom ASP nearly “unbreakable” with DB changes

31 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 31 An ASP invoked from a WAM list

32 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 32 Complementing WAM – WIS Toolkit Making Web Information Systems real The Web IS Tookit contains WAM plus... –“Impressor” “Calibrated” HTML printing with IE control by VB slave A4 layout Javascript library –“Comunicador” (Java DB and email-driven agent) Automatic generation and archive of instituional email/fax communications Automatic URL validation Extraction of structured data from (HTML) documents –Utilities Template-based user document “draft” generator Emailing helpers Web application Load Balancer

33 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 33 Web Information Systems Toolkit

34 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 34 Today’s Plan (progress) Romantic vision and “real world” impact  About WAM –WAM principles  –An example  –Meta-model editing  –Real apps grow beyond models  –Another example, “business story” Conclusion

35 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 35 A Defense Logistics Agency (DoD, USA) Grande esforço em curso desde meados dos anos 90 para melhorar gestão da cadeia de fornecimento –Lenda1: ”Era uma vez um general que precisava do seu jeep. Então...” –Lenda2: “X0% de peças dentro dos parâmetros durante...” Muitas “plataformas” com décadas de tempo de vida, muitas peças, muitos fabricantes e fornecedores –Informação evolutiva e dispersa por fontes estruturadas e textuais (redundância, incoerência, validade, etc) A XSB Inc. (cliente da Declarativa, www.xsb.com/partners.html) –Desenvolveu “Coherent View” para a DLA integrando a informação acima.....mais novos atributos de items inferidos da info DLA + bases de conhecimento Sub-sistemas Prolog alimentando base de dados SQL Server –Tecnologia para descobrir equivalência entre items, fornecedores alternativos, impacto da alteração de normas, etc.

36 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 36 O projecto WAM – CV website Informação produzida Informação disponível

37 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 37 O projecto WAM – CV website Exportação em vários formatos Critério de pesquisa aplicado Colunas escolhidas pelo utilizador Navegação para detalhe

38 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 38 CV website - conclusões Menos de 200 horas de concepção e desenvolvimento Zero esforço em “burocracia infraestrutural”, ou seja as horas foram proveitosas para o cliente. Layout automático satisfez Distância (5h de diferença horária) e questões de segurança (dados não exportáveis) dificultaram a fase final de testes e suporte Para saber mais: r.hopkins@xsb.com ou mc@declarativa.comr.hopkins@xsb.commc@declarativa.com

39 http://www.declarativa.com 24-Nov-2005 Copyright Declarativa 2000-2005 39 Today’s plan - Conclusion How to replay it –www.declarativa.com/wam/UNL24NOV2005.pptwww.declarativa.com/wam/UNL24NOV2005.ppt –Online showroom, trial version, free developer licenses Pushing the focus to the database layer –The Declarativa project distortion field R&D –Trivia X3D front-ends (Q1 2006), Postgres SQL support, other –The real thing user assertions + magic tool = IS, at all times –MSc and PhD candidates accepted: mc@declarativa.commc@declarativa.com