Applying Domain-Driven Design Jimmy Nilsson www.jnsk.se/weblog/ Webcast with UML China 2006-08-30.

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Presentation transcript:

Applying Domain-Driven Design Jimmy Nilsson Webcast with UML China

About Jimmy Nilsson Primarily a developer, but also a trainer and author Blogs at Author of Applying Domain-Driven Design and Patterns and.NET Enterprise Design

Main Focus of DDD? The core is the main focus! Forget distractions!

?

Why DDD? Knowledge- rich design Mapping to domain Reduced complexity TestabilityMaintainability Etc, etc...

Problem Description A complex, large scale and long lived order application will be built Some very simple examples of requirements: Order has a customer, customer has orders Order has one or more lines Order has a value Customer has address...

Transaction Script [PoEAA]

Table Module [PoEAA]

Domain Model [PoEAA]

Because of the problem description, we choose Domain Model Now we need a Domain Model style...

Entities [DDD]

Value Objects [DDD]

Aggregates [DDD]

Repositories [DDD]

Factories [DDD]

What problems remain? Infrastructure... Assumption 1: Relational database How? Assumption 2: O/R Mapping Which? Assumption 3: For eg NHibernate

NHibernate Domain Model style: POCO / Persistent Ignorant (PI) Mapper style: Framework Start with: Domain Model, Tables, Metadata API-Focus: Domain Model Query language: String-based, Query Object-based Open source, production version Many databases are supported Port of Hibernate Focus: ”Only” O/R Mapping

Data Mapper [PoEAA] For example Customer.hbm.xml

CRUD – C _session.Reconnect(); try { _session.SaveOrUpdate(customer); _session.Flush(); } finally { _session.Disconnect(); }

CRUD – R (Customer)_session.Load(typeof(Customer), id);

Summary... ?

Any Questions? ? Thanks for listening!

References [DDD] Eric Evans; Domain-Driven Design [PoEAA] Martin Fowler; Patterns of Enterprise Application Architecture [NHibernate] nhibernate.sourceforge.net [ADDDP] Jimmy Nilsson; Applying Domain- Driven Design and Patterns