Sogeti
Guru
Night

Erwin de Gier
Sogeti Java CoE
Amsterdam, Oktober Februari 2015
Changes in
Software
Development

3
Demands
• Mobile devices
• Multicore
• Cloud computing
• Interactive & real-time
• Responsive
• Collaborative
• Frequent changes
• Data increase

4
Trends
Microservices Event Driven Scalable

5
The Java application server
Application Server
App1 App2
App3 App4

6
The Java application server
Application Server
App1 App2
App3 App4
Application Server
App1 App2
App3 App4

7
The Java application server
Application Server
App1
Application Server
App1

8
The Cloud

9
Containers

10
Container deployment
Deploy
1.0 1.1

11
Microservices
• Independent lightweight processes
• Platform agnostic
• (Immutable) containers
• Standardized DevOps tooling
• Technology diversity

12
Event Driven Architecture
Shopping Cart
Created
Product1
Added
Product2
Added
Address
Added

13
Event Driven Architecture
• Producers
• Consumers
• Functions react to events
• Events are state changes
• Asynchronous
• Loose coupling
• Responsiveness

14
Connection scaling

15
Connection scaling
• “Classic” model of scaling threads per
connection is limited
• CPU and memory bound
• c10k problem
• non blocking event loop

16
Blocking vs non-blocking
Client Server
One thread per
connection (1 client)
Client Server
One thread per event-
loop (multiple clients)
Request
Response
Request
Request
Request
Callback
Callback
Callback

17
Reactive manifesto
• react to events (message driven)
• react to load (scalable)
• react to failure (resilient)
• react to users (responsive)

18
Need for a new solution
• Deployment of light-weight processes
• Asynchronous stack
• Reactive programming
• Polyglot
• Distributed
• Event driven

19