Einstieg in ereignisgesteuerte Architekturen in 2023

Dennis Kieselhorst @ Amazon Web Services
Einstieg in ereignisgesteuerte
Architekturen in 2023
System Architektur

View Slide

EINSTIEG IN EREIGNISGESTEUERTE ARCHITEKTUREN IN 2023
© 2023, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Einstieg in
ereignisgesteuerte
Architekturen in 2023
Dennis Kieselhorst
Principal Solutions Architect
Amazon Web Services

View Slide

Coupling – Integration’s magic word
Coupling is a measure of independent variability
between connected systems.
Decoupling has a cost, both at design and run-time.
Coupling isn’t binary.
Coupling isn’t one-dimensional.
A B
Source: EnterpriseIntegrationPatterns.com

View Slide

© 2023, Amazon Web Services, Inc. or its affiliates. All rights reserved. 4
Let’s review:
Synchronous HTTP
microservices

View Slide

Challenges with synchronous distributed systems
Ordering
Fulfill
Order
Payment
Loyalty
User
Send order to be prepared
Update order status
Send data for rewards

View Slide

Ordering
Fulfill
Order
Payment
Loyalty
User
ERROR: 500

View Slide

Ordering
Fulfill
Order
Payment
Loyalty
User
Response time: 10 seconds
Is the Loyalty service a requirement
to complete an order?

View Slide

Ordering
Fulfill
Order
Payment
Loyalty
User
What if menu item is sold out?
Is it available to order?
Need to update order? Invalidate?

View Slide

Ordering
Fulfill
Order
Payment
Loyalty
User
What happens as the system
becomes more complex?
CRM

View Slide

Event-driven architectures (EDA)
An architectural style of building
loosely-coupled software systems that
work together by emitting and
responding to events.
10

View Slide

An architectural style of building
loosely-coupled software systems that
work together by emitting and
responding to events.
11

View Slide

• Architectural style
▪ It’s a mindset, not a list of technologies
▪ EDAs are mostly asynchronous, and eventually consistent
• Loosely coupled
▪ Services don’t call one another directly
• Systems emit and respond to events
▪ Emitting events is easy
▪ Multiple ways receive/fetch/respond
12

View Slide

In an event-driven architecture, systems and
development teams communicate via events
15
Event
broker

View Slide

event
A signal that a
system’s state has
changed. Immutable
facts that have
occurred in the past.

View Slide

Event modeling
Enable your technology to
reflect your business
17

View Slide

Properties of events
• Events are signals that a system’s
state has changed
• Events occur in the past
(e.g. OrderCreated)
• Events cannot be changed
(immutable)
• Decrease coupling by restricting
information to key data
"source": "com.orders",
"detail-type":
"detail":
"metadata":
"idempotency-key":
"data":
"order-id"

View Slide

In an event-driven architecture, systems and
development teams communicate via events
19
Event
broker
Producer
Event producers are
systems that detect a
change in state or notice
updates and publish those
facts. Application code, a
database or a time-based
trigger can serve as event
producers, among other
things.
An event broker is a
meeting place between
the producers and
consumers. The broker
is how events are
exchanged.
Consumer/ Subscriber
Event consumers are
systems that listen for
events and use them for
their purposes. It’s possible,
and common, for a
consumer to receive an
event, perform some work
and publish its event in
response.

View Slide

Event-driven architectures enable
20
An accelerated pace of innovation with increased developer
agility and speed of new feature release
A quicker path to modernization by ingesting events from
existing systems to build new applications and functionality
Better customer experiences with the ability to scale to
handle unexpected peaks and fewer single points of failure

View Slide

Implementing EDA
in 2023

View Slide

Serverless was designed for the event-driven model
22
No infrastructure to
provision or manage
Automatically scale
to millions of users
Pay per use
billing model
Highly available
and durable
OFF

View Slide

Serverless was designed for the event-driven model
Only run when invoked by events
Built-in features and integrations for working with events
Focus on business logic, not infrastructure management
23
Paying for idle
Capacity cost Capacity utilization

View Slide

Event brokers
Queues
• Amazon Simple Queue
Service (SQS)
• Amazon MQ (for Apache
ActiveMQ and RabbitMQ)
Streams
• Amazon Kinesis
• Apache Kafka/
Amazon Managed
Streaming for Apache
Kafka (MSK)
Routers
• Amazon EventBridge
• Amazon Simple
Notification Service (SNS)
24
Pull-based Push-based

View Slide

Amazon EventBridge architecture
Partner
event source
Rules
Default event bus
Custom event bus
SaaS event bus
Amazon EventBridge

View Slide

Introducing Unicorn Properties
Our use case is based on a real estate
company called Unicorn Properties
As a real estate agency, Unicorn Properties
needs to
1. manage the publication of new property
listings
2. manage contracts linked to individual
properties
3. provide a way for their customers to view
approved property listings

View Slide

The architecture
Unicorn Contracts
Unicorn Properties Web
Unicorn Properties
1
3
2
Contracts API
Property images
S3 bucket
Agent
Contracts
table
Properties
Web API
Search
function
Approval
function
Publication
evaluation event
handler
Customer
Unicorn
Properties
event bus
Properties
table
Agent
Contracts
function
Unicorn.Contracts
Unicorn.Web
Contract status
table
Property Publishing
Approval workflow
Contract status changed
event handler
Contract status
checker
Property
approvals sync
SendTaskSuccess
Unicorn.Properties
Wait for contract
approval
Parameter Store

View Slide

Hands-on workshop
Supported by fully functional reference architectures
s12d.com/aws-sde-python s12d.com/aws-sde-ts s12d.com/aws-sde-java s12d.com/aws-sde-dotnet
Python TypeScript Java C#
Instructions
https://catalog.workshops.aws/serverless-developer-experience

View Slide

Takeaways
In an event-driven architecture,
systems and development teams
communicate via events.
EDAs can give you:
• Greater developer agility and extensibility
• Increased scalability and fault tolerance
• Lower total cost of ownership
Serverless services are uniquely
compatible with EDA.
33

View Slide

Q&A

View Slide

Learn more
Event-Driven Architectures
on Serverless Land
• Workshops
• Guides
• Architecture patterns
35
https://serverlessland.com
/event-driven-
architecture/intro

View Slide

Thank you!

View Slide

Appendix

View Slide

Lego uses an event-driven design for scalability
38
Commerce
platform
Order &
customer updates
Event
relay
Amazon
EventBridge
Login
Customer
login
Checkout
Submit
order
Order
Process
order
Shipping
Send order
to SAP
Data sync
Customer, VIP,
wishlist sync
Payment
Authorize
payment
FIFO queue
Customer
login
Invoke every
minute
Order
complete
Events
Payment
authorized
Customer
login
Order
complete
Order
submit
• Lego’s traffic spikes on peak
days —leading to a 2017
Black Friday crash
• An event-driven design scales
automatically, eliminating the
problem of crashing during peaks

View Slide

Processing 8.1M mail items per day with events at
PostNL
39
AWS
Community
Day Benelux
2021

View Slide

Einstieg in ereignisgesteuerte Architekturen in 2023

Einstieg in ereignisgesteuerte Architekturen in 2023

Dennis Kieselhorst

More Decks by Dennis Kieselhorst

Other Decks in Technology

Featured

Transcript