What does it do?

ubiquitous language

• Airplane is assigned to a rotation. 
• A rotation consists of legs.
• A leg is a directed relocation of airplane between two airports at given date.
• A flight consist of legs and has a flight designator. 
• Each airport defines standard ground time which is the minimum time that airplane have to spend on ground between consecutive legs. 
• One can check if all legs in a rotation hold continuity property, does not violate standard ground times and flight numbers are not duplicated.

Rotations EXAMPLE

continuity check example

ground time check example

flight designator check example

import example

REST API - THE write side

• POST /abstract-leg
• POST /airplane
• POST /airplane/assign-rotation
• POST /rotation
• DELETE /rotation/:id
• POST /rotation/add-leg
• POST /rotation/remove-leg
• POST /import

REST API - THE READ side

• GET /rotation
• GET /rotation/:id
• GET /airplane
• GET /airplane/:id
• GET /checks/neo4j?checkType=groundTime
• GET /checks/neo4j?checkType=flightDesignator
• GET /checks/neo4j?checkType=rotationContinuity
• GET /checks/inMemory?checkType=groundTime
• GET /checks/inMemory?checkType=flightDesignator
• GET /checks/inMemory?checkType=rotationContinuity

DEMO I

it actually works

How does it work?

building blocks

Event sourcing

Command query responsibility segratation

Application architecture

Life of an event

LIFE of an event

LIFE of an event

LIFE of an event

LIFE of an event

main challenges

• Event sourcing
  • solution: akka-persistence
• Replayable event bus
  • solution: own on top of Kafka and Cassandra
• Load balancing
  • solution: akka-clustering routers

does it scale?

Read model scalability

Life of a read model

Life of a read model

LIFE of a query

Life of a query

write model scalability - soon

akka-cluster-sharding

tools

• Ansible
• Kamon
• Zipkin
• Akka tracing
• Gatling
• Akka clustering JMX
• Visual VM
• SBT

DEMO II

scale out!