The document discusses changes in software development emphasizing demands such as mobile devices, cloud computing, and real-time interactivity. It highlights trends like microservices and event-driven architecture, which support scalable, responsive systems using lightweight processes and asynchronous communication. Additionally, it addresses the limitations of traditional scaling models and promotes a reactive approach to programming and deployment.

1. Sogeti
Guru
Night

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

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

4. 4
Trends
Microservices Event Driven Scalable

5. 5
The Java application server
Application Server
App1 App2
App3 App4

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

7. 7
The Java application server
Application Server
App1
Application Server
App1

8. 8
The Cloud

9. 9
Containers

10. 10
Container deployment
Deploy
1.0 1.1

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

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

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

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Connection scaling

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

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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

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

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

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