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Innovative solutions with Axon Framework
Allard Buijze – [email protected] – @allardbz At ANWB, Casumo, Gerimedica, Bridge Big
Four cases
Casumo
Online Casino
Games, Slot machines
High volumes
Auditing requirements
“Keep the spin button FAST!”
ANWB
Emergency assistance call-center
Task based system
3rd party integrations
Reporting requirements
Somewhat predictable peak-loads
Bridge Big
Online Bridge platform
Participants play for money
Large-scale tournaments
Elastically scalable
“Keep the game flowing smoothly”
Gerimedica
Electronic Medical Record
SaaS solution
Many integrations
High availability
Medical analysis on historic data
“Improve healthcare through technology and sharing knowledge”
What connects these cases?
?
Complex domain model
Complex environment
Value in history
Performance expectations
Avoid the Big ball of “Mud”
Source: http://www.sabisabi.com/images/DungBeetle-on-dung.JPG
Microservice Architecture
Source: http://martinfowler.com/articles/microservices.html
Microservices vs Monoliths
Almost all the cases where I've heard of a system that was built as a microservice system from scratch, it has ended up in serious trouble.
Almost all the successful microservice stories have started with a monolith that got too big and was broken up
Martin Fowler
Source: http://martinfowler.com/bliki/MonolithFirst.html
A Monolith is not (always) a Big Ball of Mud
St Breock Downs Monolith - www.cornwalls.co.uk
Desired evolution
1 – Build a monolith 2 – Extract components 3 – Extract more 4 – Scale as needed
Axon Framework
“CQRS Framework” for Java
Open source (Apache 2 License)
Simplify CQRS based applications
Building blocks common in CQRS-based architectures
3.0-M1 released on 10th June, 2016
axonframework.org
Axon Framework – Core Principles
Message oriented
Events Commands
Location transparency
Separate infrastructure from business logic
Customizable
Configure to match your infrastructure, not vice versa
CQRS
CQRS Based Architecture
Command model Projections
CQRS Based Architecture
Command model Projections
T: 1 mln / s Resp: < 10 ms
T: Thr. 20 / s Resp: < 100 ms
T: 10 mln / s Resp. < 100 ms
T: 1 / s Resp. < 10 ms
Synchronizing models
Command model Projections
Events
CQRS Based Architecture
Separate infrastructure from business logic
A
D
B
E
C
Spring configuration - Simple
EmbeddedEventStore
TrackingEventProcessor
SimpleCommandBus
Separate infrastructure from business logic
A
D
B
E
C
Separate infrastructure from business logic
A
D
B
E
C
Infrastructure components – Distributed Setup
EmbeddedEventStore
TrackingEventProcessor
DistributedCommandBus
Separate infrastructure from business logic
A
D
B
E
C
Separate infrastructure from business logic
A
D
B
E
C
Infrastructure components – Clustered Setup
EmbeddedEventStore
ClusteringEventProcessor
DistributedCommandBus
CQRS Based Architecture
Axon – Command Bus API
commandBus.dispatch(commandMessage, new VoidCallback() { @Override public void onSuccess() { ... } @Override public void onFailure(Throwable cause) { ... } });
@CommandHandler public void handle(CreateToDoItemCommand command) { // handle command }
Axon – Event Bus API
@EventHandler public void onEvent(ToDoItemCompletedEvent event) { // handle event }
eventBus.publish(asEventMessage(new ToDoItemCompletedEvent(“todo1”)));
CQRS Based Architecture
class AggregateLifecycle @CommandHandler @EventSourcingHandler
Event Sourcing
Event Sourcing
ID OrderID Product Count 1 1 Deluxe Chair 1
2 1 ... ...
vs
OrderItems
Seq# Event 0 OrderCreatedEvent
1 ItemAddedEvent (2x Deluxe Chair - € 399)
2 ItemRemovedEvent (1x Deluxe Chair - € 399)
3 OrderConfirmed
4 OrderCancelledByUserEvent
5 ReturnShipmentReceived
ID Status 1 Return shipment rcvd
Orders
Event Logs
CQRS Based Architecture
interface EventStore class EmbeddedEventStore class JpaEventStorageEngine class JdbcEventStorageEngine class MongoEventStorageEngine
class TrackingEventProcessor class SubscribingEventProcessor
Summarizing
Axon Framework – Some cases
Finance
Process automation in a top 50 bank Trading engine for ETF (index trackers) trading On-line payment processing
Gaming & Betting
On-line bridge platform (bridgebig.com) On-line casino (casumo.com) Price calculation at large betting office
Healthcare
Electronic Medical Record for the Geriatric Healthcare Tracking and Tracing of equipment for dental implants
Transportation & Logistics
Optimizing aircraft movement at several large airports
Getting started...
Download: axonframework.org/download
or: maven central repository
Code: github.com/AxonFramework
Help: [email protected]
or: @axonframework
