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Среда Разработки в IBM
Intro to Event-Driven Design with
JavaScript
Agenda
● Basics and EDA intro
● Code writing
The three styles of interaction
Type of interaction Initiator Participants
Time-driven Time The specified system
Request-driven Client Client and Server
Event-driven Event Open-ended
Time driven
Fruit
system
run inventory check every 60 mins
Request driven
Tarzan
Fruit
systemMe want three banans!
Event driven
Fruit
system “Tarzan took
three bananas”
“Fruit system is
low on bananas”
5 Principles of EDA
● “Real-time” events as they happen at the producer
● Push notifications
● One-way “fire-and-forget”
● Immediate action at the consumers
● Informational (“someone logged in”), not commands (“audit this”)
Typical EDA architecture
system system system
system system system
Event Bus
Event
Poducer
Event
Transport
Event
Consumers
Main benefits of EDA
● Better service (no batch, less waiting)
● No point-to-point integration (fire & forget)
● High performance, highly scalable systems
The birth of system
Inventory
Customer
Shop
The monolith
Inventory
Customer
Shop
Newsletter
Reporting
Payment
SOA architecture
Shop Payment Newsletter
Inventory Customer Reporting
Divide the problem domains into separate systems
SOA architecture
Shop Payment Newsletter
Inventory Customer Reporting
A lot of point to point integration...
SOA + EDA =
Shop Payment Newsletter
Inventory Customer Reporting
Event Bus 3th system
Core
[Observer’s minimum]
1. Publisher
2. Message
3. Subscriber
4. Emitter
5. *Topics
Simple EDD implementation
Simple Example
EmitterPublisher
Subscriber
Subscriber
Publisher/
Subscriber
Time to code!
Links
Mediator pattern - http://largescalejs.ru/the-mediator-pattern/
Context in JS (this, #call and #apply) - https://learn.javascript.ru/call-apply
Event Driven Architecture by Stefan Norberg on SlideShare -
http://www.slideshare.net/stnor/event-driven-architecture-3395407

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Cреда разработки #1: eda in js