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Using the Actor Model with
Domain-Driven Design (DDD) in
Reactive Systems
@VaughnVernon
Copyright © 2012-2017 for{comprehension} All rights reserved.
@VaughnVernon
http://VaughnVernon.co
vaughn@forcomprehension.com
Books
Consulting and Training
for{comprehension}
Objects
1973 - 2003
Cores Matter
More cores, not (much) faster cores
Threading Is Easy!
Threading Is Hard!
Actor Model
Alan Kay: “The big idea is messaging...”
Carl Hewitt, 1973
Jonas Bonér, Akka
Actors Are
Reactive
Reactive Is
Reactive Is
Reactive Is
Reactive Is
Why the Actor Model Now?
#IoT
Because Cores
88 / 200+ cores with Xeon Phi co-processors
Embrace
Latency
More
With
Less
Direct Asynchronous Messaging
Lock-Free, Share Nothing
Become:
Prepare for Next Message
Actor System
Actor Concurrency
How Many Actors?
50+
100+
1,000,000+
Typical Architecture
Complexity Stack
Simplicity Stack
Inventor of DDD
Essence of DDD
Context Mapping
Responding to Rapid
New Business Direction
DDD enables necessary
knowledge crunching
Actors and messages enables
rapid implementation and
clear understanding
Actors and DDD
Alan Kay: “The big idea is messaging...”
Alan Kay: “The Actor model retained more
of what I thought were the good
features of the object idea.”
Ubiquitous
Language
As Actors and messages...
Using the Actor Model with Domain-Driven Design (DDD) in Reactive Systems - with Vaughn Vernon
Actor
Command Event
Actor
Command Event
Event Storming
Time
Use design-level storming
Aggregates
Transactional Consistency Boundary
Aggregate
● Immutable state object/record
Implementation
● Transition and replace state
upon command
● Emit corresponding event
Reactive Systems
Read: Designing Reactive Systems With The Actor Model (free O'Reilly book)
Watch:
Benefits Of The Actor Model For Cloud Computing: A Pragmatic Overview For Java Architects
(co-presented with Forrester Research)
Learn from experts: ask about our Embedded Lightbend Engineer (ELE) for
kickstarting your Reactive initiatives
More Resources You May Enjoy…
MICROSERVICES. FAST DATA PIPELINES. DISTRIBUTED SYSTEMS.
Austin (TX) - October 18-20, 2017
reactivesummit.org
@VaughnVernon
vaughn@forcomprehension.com
for{comprehension}
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