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Book Club: Implementing Domain-Driven Design Ch 5 - 6

This is the third session of our Implementing DDD book study.


The core group felt like this material deserves extended study "as long as it takes", so we're going "off script" and adjusting the scheduling to fit the group's needs.

As such, the third session we will attempt to cover chapters 5 and 6, Entities, and Value Objects.

If anyone is interested in presenting material / code / summary of either chapter 5 or 6, just respond on the bottom of this page and when you RSVP. If there is nothing specific anyone wants to show, then we will engage in open discussion about the chapters / topics.

Workshop Sessions coming!

We also discussed collaborating on extending Anshu's code example which was based on Greg Young's "Super Simple CQRS" example. So, we'll schedule a "workshop" session also in between discussion meetings.

 

Details:

Domain-Driven Design community leader Vaughn Vernon recently published Implementing Domain-Driven Design! Book summary:

Implementing Domain-Driven Design presents a top-down approach to understanding domain-driven design (DDD) in a way that fluently connects strategic patterns to fundamental tactical programming tools. Vaughn Vernon couples guided approaches to implementation with modern architectures, highlighting the importance and value of focusing on the business domain while balancing technical considerations.

Building on Eric Evans’ seminal book, Domain-Driven Design, the author presents practical DDD techniques through examples from familiar domains. Each principle is backed up by realistic Java examples–all applicable to C# developers–and all content is tied together by a single case study: the delivery of a large-scale Scrum-based SaaS system for a multitenant environment.

The author takes you far beyond “DDD-lite” approaches that embrace DDD solely as a technical toolset, and shows you how to fully leverage DDD’s “strategic design patterns” using Bounded Context, Context Maps, and the Ubiquitous Language. Using these techniques and examples, you can reduce time to market and improve quality, as you build software that is more flexible, more scalable, and more tightly aligned to business goals.


Coverage includes:

> Getting started the right way with DDD, so you can rapidly gain value from it

> Using DDD within diverse architectures, including Hexagonal, SOA, REST, CQRS, Event-Driven, and Fabric/Grid-Based

> Appropriately designing and applying Entities–and learning when to use Value Objects instead

> Mastering DDD’s powerful new Domain Events technique

> Designing Repositories for ORM, NoSQL, and other databases

 

How to sign up

We need volunteers to help present summaries of the chapters, 2 to 3 chapter per session, over the course of N sessions and X months. And, of course need even more people to attend and enjoy!

  • Want a free copy of the book by volunteering to do a presentation? To be one of the two presenters for any of the N sessions and get the book free, then RSVP on this page, then see Speaker guidelines below for more info.
  • Want to read, but not present? If you don't want to present, but do want to buy a copy of the eBook or print book, at a 35% discount, then RSVP on this page, then click the Addison-Wesley perk on the left side of this page to get the discount code to use at InformIT.com!

You can also, of course, choose to attend without even reading the book, if you like :-) If you do that, at least view the videos linked in this blog post on the VersionOne Dev Blog: The importance of Thinking Inside the Box illustrated in new book: Implementing Domain-Driven Design

 

Speakers spreadsheet and schedule

Full schedule and presenters already signed up  on this spreadsheet. Here's the outline of dates and chapters covered:

 

Sessions agenda

6:00 - 6:15: Setup, socialize at VersionOne @ Glen Iris

6:15 - 8:00: Presentations and open discussion (also over GoToMeeting, mute your mic until we pause for discussions)

8:00 - 9:00: Gather at Manuel's Tavern for drinking, dining, more discussion for those in town!

 

GoToMeeting Info:

**Not available tonight**

 

Session 3: Tue May[masked]

Chapters:

  • 5: Entities
  • 6: Value Objects

Presenters: 2 open

 

Session 4: Tue June[masked]

Chapters: (Subject to change!)

  • 7: Services
  • 8: Domain Events
  • 9: Modules
  • 10: Aggregates
  • 11: Factories

Presenters: Josh Gough, 1 open

 

Session 5: Tue July[masked]

Chapters:

  • 12: Repositories
  • 13: Integrating Bounded Contexts

Presenters: 2 open

 

Session 6: Tue July[masked]

Chapters:

  • 14: Application Example
  • 15: Aggregates and Event Sourcing

Presenters: 2 open

 

Speaker guidelines


It's simple. Here's what we ask:


Before signing up:

  1. Review the full schedule of days and the chapters on this spreadsheet.
  2. RSVP on the Meetup site, indicating which session you want to present on, then Send a Message to Josh Gough to provide him your mailing address if you prefer a physical book, or your email if you prefer an eBook, and he will have VersionOne buy it for you.

After signing up:

  • Coordinate how to collaborate on the presentation with your co-presenter. Use Skype or something like that if you are not local to Atlanta. Please be prepared to carry the weight of the presentation if your partner falls ill or absent. Redundancy!
  • Cover the chapter materials well enough that someone who didn't read the chapters will understand the gist of the concepts.

Consider doing:

  • In your presentation, refer to situations where the concepts have been or could be helpful in your own projects, using code examples of your own if you have some
  • Contribute additional links and resources in your presentation to help people learn more about the subject


A Few More DDD Getting Started Resources

You can always use http://dddcommunity.org/learning to find more, but here's a blog I wrote on the VersionOne Dev Blog with more info and links to some great starting points: The importance of Thinking Inside the Box illustrated in new book: Implementing Domain-Driven Design.

 

Thank you!

Thanks goes to book author Vaughn Vernon himself, his publisher Addison-Wesley, Addison-Wesley Senior Publicist Heather Fox, and to VersionOne for their sponsorship of this endeavor!

Join or login to comment.

  • Adam C.

    This meetup was also very interesting and useful. The people who miss these things are missing a lot.

    May 21, 2013

  • Josh G.

    I did not bring the correct audio equipment, so we will not be able to do the call in on GoToMeeting this time. Sorry about that. We also need to determine a better way to do that, moving forward, if at all because of the difficulties people have remotely listening and participating.

    May 21, 2013

  • Erin

    Not as prepared as I wanted to be for this session, so be prepared to talk :)

    May 20, 2013

    • Anshuman S.

      Talking is better.. looking forward to a participative discussion.

      May 21, 2013

  • Josh G.

    If you would like pizza, please "raise your hand" and let me know what you like. We ordered too much the last couple of times :)

    May 21, 2013

    • Erin

      anything but green peppers (or red peppers). Just a slice or two.

      May 21, 2013

  • Josh G.

    I have a project to demo called DDD IQ Wars, event driven architectureish / live web: AngularJs, Node.js, Socket.io, MongoDB. No C# or .NET -- please forgive me :) Would love others' thoughts on improving it in light of Entities and Value Objects

    May 20, 2013

  • Mark K.

    Might connect while in flight, not sure if I can time it.

    May 20, 2013

11 went

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