The document introduces Telosys, an open source code generation tool that allows developers to quickly generate code from models using templates. It aims to improve productivity, standardization, quality and simplicity over manual coding. The document demonstrates how to define a model and templates, and then generate Python web application code including entities, services, controllers and views using Telosys.

1. My web application in 20 minutes
( code generation with Telosys )
https://www.telosys.org/ @telosys

2. @telosys https://www.telosys.org
By day
Senior architect
at
@ltguerin
Laurent Guérin Open Source supporter
Passionate by software engineering
and development industrialization
By night
Creator of
code generator
Who’s speaking?

3. @telosys https://www.telosys.org
• Productivity : write the templates once and reuse them many times
• Simplicity : a model brings a high level of abstraction (part of the
complexity is managed by the generator)
• Standardization & Consistency : get always the code you expect (same
principles, patterns, behaviors, conventions, coding rules, etc)
• Quality : Clean Code, Software Craftsmanship, testability, Unit Tests
generation, etc
Why should I use code generation?
But very often code generators are heavy and complicated tools :-(
That's why Telosys has been created…

4. @telosys https://www.telosys.org
Telosys philosophy
Keep it open, simple and pragmatic!

5. @telosys https://www.telosys.org
A “project booster”
Light tool designed to be usable by any developers
Not a strategic choice
(you can use it and drop it after use)
Quick start (very short learning curve)
Telosys in short

6. @telosys https://www.telosys.org
no "black box"
syndrome
everything is
customizable
Customization : generate the code you want
? !
models
templates resulting code
is exactly what
you want
any file, any language, any framework

7. @telosys https://www.telosys.org
Eclipse Plugin C L I
with extensions
for VSCode, Atom, Notepad++, etc
Telosys offers 2 tools

9. Controllers Services
Views
D.A.O.
Entities
DSL
model
Bundle of
templates
Bundle of
templates
Scripts
(SQL)
Bundle of
templates
Plant
UML
Demo - The big picture
Telosys CLI
Project
Generated
code
Generator with
model & templates
1
2
3
VS Code
Tests
Generation

10. Demo – Step 1 : define a model

11. Demo – Step 2 : define or reuse templates

12. Demo – Step 2 : define or reuse templates

13. Demo – Step 3 : code generation
Part 1 : use bundle “plantuml”
to generate “model.planuml” file
DSL
model
Bundle
“plantuml”
> b plant
> gen * *

14. Demo – Step 3 : code generation
Part 2 : use bundle
“python-persistence-sqlalchemy”
to generate python files
(entities, DAO, services, unit test, scripts)
DSL
model
Services D.A.O.
Entities
Bundle
“python-persistence-sqlalchemy”
Scripts
Tests

15. Demo : launch scripts ( database & unit tests )
> create_database.py
> init_database.py
> run_tests.py

16. Demo – Step 3 : code generation
Part 3 : use bundle
“python-web-mvc-bottle”
to generate python files & .tpl files
(controllers & views)
DSL
model
Bundle
“python-web-mvc-bottle”
Controllers
( xxx.py )
Views
( xxx.tpl )
Services
Entities
D.A.O.

17. Demo : after code generation… launch the web app
> app.py

19. Stay tuned
@telosys tag "telosys" groups/1340197/ channel "Telosys"
www.telosys.org
• Telosys CLI :
https://github.com/telosys-tools-bricks/telosys-cli
• Telosys Eclipse plugin :
https://github.com/telosys-eclipse-v3/TelosysToolsPlugin
• Bundles of templates :
https://github.com/telosys-templates-v3
All stars are welcome ;-)

20. Telosys items used for the demo
• Model :
• https://telosys.org/download/models-v3/ : Cars-dsl-model-telosys-330.zip
• Bundles of templates :
• PlantUML :
https://github.com/telosys-templates-v3/plantuml-T330
• Python entities, DAO (SQLAlchemy), services & DB init :
https://github.com/telosys-templates-v3/python-persistence-sqlalchemy
• Python MVC controllers and views (Bottle framework) :
https://github.com/telosys-templates-v3/python-web-mvc-bottle
• Python REST API (Bottle framework) :
https://github.com/telosys-templates-v3/python-web-rest-bottle

21. Python items used for the demo
> python --version
Python 3.9.0
> pip list
Package Version
---------- -------
bottle 0.12.19
greenlet 1.1.2
pip 21.3.1
setuptools 49.2.1
SQLAlchemy 1.4.26
https://bottlepy.org/docs/dev/
https://www.sqlalchemy.org/