Henning Schwentner

Domain-Driven Transformation—How to Bring (Back) Sustainable Architecture to Legacy and Monoliths

What if you could renovate your legacy monolith like an old building, instead of attempting a risky big-bang rewrite?

Domain-Driven Transformation—How to Bring (Back) Sustainable Architecture to Legacy and Monoliths
#1about 4 minutes

Transforming legacy systems like renovating old buildings

An analogy of renovating a historic warehouse into a modern concert hall illustrates the potential and challenges of software modernization.

#2about 7 minutes

Identifying common diseases in legacy software systems

Legacy systems often suffer from common architectural problems like being a "Big Ball of Mud," having an anemic domain model, or poor team organization.

#3about 4 minutes

A four-step framework for strategic transformation

A structured, four-step approach to modernization involves rediscovering the domain, modeling the target architecture, aligning it with the current state, and executing the changes.

#4about 5 minutes

Rediscovering the business domain with collaborative modeling

Use collaborative modeling techniques like Domain Storytelling to shift focus from the existing technical solution back to the core business problems and processes.

#5about 4 minutes

Defining the target architecture with bounded contexts

Use insights from domain discovery to identify sub-domains and define clear boundaries, creating a target architecture composed of distinct bounded contexts.

#6about 9 minutes

Mapping the target architecture onto the existing code

Analyze the current codebase to understand its structure and identify how to map the desired bounded contexts onto existing components, revealing shared dependencies.

#7about 5 minutes

Planning the transformation with an improvement backlog

Manage the modernization effort by creating a dedicated improvement backlog for refactoring tasks and allocating a consistent portion of sprint capacity to this work.

#8about 5 minutes

A step-by-step example of incremental refactoring

A detailed walkthrough shows how to extract a bounded context from a monolith by incrementally moving methods and classes while ensuring the system remains deployable.

#9about 3 minutes

Monolith transformation is a marathon not a sprint

The key to successful monolith transformation is recognizing it as a long-term, incremental journey that is difficult but ultimately possible with sustained effort.

#10about 15 minutes

Q&A on tools, metrics, and distributed teams

The speaker answers audience questions about using tools like ArchUnit and SonarQube, tracking KPIs, and managing distributed teams during a transformation process.

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