Large – scale Structure (DDD)

Presenter: Khoa Anh Nguyen

Table content• Bounded Context• System Metaphor• Responsibility Layers• Pluggable Component Framework• Knowledge Level• Evolving Order• Refactoring Toward a Fitting Structure.• Summary

Bounded Context• BOUNDING CONTEXTS gives team members a clear and

shared understanding of what has to be consistent and what can develop independently

System Metaphor

• Metaphor is a particular way to develop a whole system.

• Capture the imagination of team member and leading thinking in useful direction.

Responsibility Layers• Responsibility should tell a story of the high-level purpose

and design of your system.• Refactor the model so that the responsibilities of each

domain object, AGGREGATE, and MODULE fit neatly within the responsibility of one layer

Responsibility Layers

Application.DAL

Application.Repository

Application.Manager

Application.Web DTO C

OR E

C O M

M

O N

Pluggable Component Framework

• Create a framework that allows an independence plugin can be plugged to system easily without changing any code in Central Hub.

Knowledge Level• A group of objects that describe how another group of

objects should behave

Operational Level

Knowledge Level

Support-Ticket

StatusNew

ProcessingPendingResolved

Evolving Order• Large-scale structure should be applied when a structure

can be found that greatly clarifies the system without forcing unnatural constraints on model development.

Evolving Order• An ill-fitting structure is

worse than none.

Refactoring Toward a Fitting Structure

• A useful structure can be found from:• A very deep understanding of the domain.• Practical way of that understanding.

• Evolving Order must fearlessly rethink the large-scale structure throughout the project life cycle.

Summary• “large-scale structure" is a language that lets you discuss

and understand the system in broad strokes and teams can work independently.