JBCN conf 2017 Tomorrow Model Driven Development

•

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This document provides an overview of a presentation on model-driven software development approaches. It discusses Domain-Driven Design (DDD) and how it focuses on building a coherent domain model through collaboration between developers and domain experts. It also discusses other approaches like Business Process Management (BPM) and Decision Management and their similarities to DDD in centering knowledge of the domain. The presentation provides examples of how these approaches could be implemented together using microservices and Spring Cloud for an emergency dispatcher system. It concludes with an announcement about the new Activiti 7 community open-source project.

Technology

Tomorrow’s “Model” Driven
Development
JBCN Conf 2017 - Barcelona

About us
• Mario Romano
– Full Stack Developer
– Microservices
– Angular 2
– BPM
– Working @ Alfresco
• APS & ADF
– Twitter: @MagemelloMario
• Mauricio Salatino (Salaboy)
– BPM & Rules Background
– Working @ Alfresco
• Activiti 7 Technical Leader
– Twitter: @salaboy
– http://salaboy.com

Agenda
• Software Development Approaches
– What is DDD?
– Other Approaches
• What do they share? What is different?
• Implementation
– Architectural Point of view
• Spring Cloud
• Demo

What is
DDD?
• Domain Driven Design
“DDD is a software development approach to
create high quality software model design
that meets core business objectives.”

Core
Business
Value
• Domains, Sub-Domains and Core Domains
• (Bounded Context / Shared Language) = Model
• Context Maps

Concepts,
Best Practices
& Common
Pitfalls
• Entities
• Value Objects
• Domain Events
• Modules
• Aggregates
• Services
• Factories
• Repositories

Recommended
Patterns
• CQRS
• Event Sourcing
• Abstraction Layers
• Eventual Consistency
• EDA
• Sagas

Key
Takeaways:
Business Value
• We focus on what is important
• Build a coherent Model (Developers & Domain
Experts together)
• The model is concise, well focused and easy
to understand so it can be used to train new
people
• We add/remove/update things based on the
Business Value that they provide
• Continuous improvement in an agile fashion
• A cultural change is required

Key
Takeaways:
Best Practices
& Tools
• We gain a deep understanding about the
problems
• We apply the best tool for the job
• Models are clearly defined and scoped
• Teams can be organized around these Models

Other
Approaches
• Business Process Management
– Work with Domain Experts to create high level
abstractions about how they work.
– Business Processes “how people and system
work together”
• Decision Management
– Work with Domain Experts to build decision
models
– Decision Tables and Decision Trees: “how
decisions are made”
• Well understood by the industry
– They are standardized, BPMN 2.1, DMN 1.1
– Organizations see a lot of business value in
these approaches

BPM
• Business Processes (Fire Emergency)

Similarities
• Centralized Knowledge is Key
– The org gains useful model of its own domain
– A refined understanding of the business is
developed
– Domain experts contribute to software design
• Important cultural change required
• Agile, iterative and continuous improvement is
the norm

Differences
• “Model” means different things
– DDD: well crafted (Java) Model -> Technical
– BPM: Business Process -> Non-Technical
– DM: Decision Model -> Non-Technical
• Can we leverage the best of both worlds?

Emergency Dispatcher
Emergency
Request
Arrives
Emergency
Enriched &
Processed
Emergency
Procedure
Triggered

Emergency
Source
Emergency
Enricher
Emergency
Dispatcher
-
(Complex)
Spring Cloud Data Flow - Message Bus
Eureka
-
Procedure
Registry
Zuul - Gateway
Google
-
Location
Service
Spring Data
-
Patient Record
Service
Service
-
Emergency
Codes
Activiti
-
Emergency
Procedure A
Service
-
Emergency
Procedure B
Activiti
-
Default Emergency
Procedure
…
INFRASTRACTURE (Changes rarely) DOMAIN
KNOWLEDGE
(Changes often)
Zipkin
-
Tracer

Demo
• Emergency Dispatcher
• https://github.com/Salaboy/jbcnconf-2017-emergency-dispatcher
• Run it on your laptop!

Activiti 7
Community
OSS
• http://www.activiti.org
• New Rebooted Project
• Re-designed & Re-engineered on top of
Spring Boot 2 / Spring Cloud
• Embedded Process Runtime
• Embedded Decision Runtime
• Embedded Case/Contextual Runtime
• Public announcements to be made in July
• Want join us?

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