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THE 6 TRAITS OF A REACTIVE MICROSERVICE
1. Isolation2. Asynchronicity3. Autonomicity
4. Single Responsibility5. Exclusive State
6. Mobility
One actor is no actor.Actors come in systems.
— Carl Hewitt
MICROSERVICESCOME IN SYSTEMS
SYSTEMS NEED TO
EXPLOITREALITY
INFORMATION HAS
LATENCY
WE ARE ALWAYS LOOKING INTO THE PAST
INSIDE DATA: OUR CURRENT PRESENTOUTSIDE DATA: BLAST FROM THE PASTBETWEEN SERVICES: HOPE FOR THE FUTURE
— PAT HELLAND (DATA ON THE INSIDE VS DATA ON THE OUTSIDE)
EMBRACE THE CONSTRAINTS OF
DISTRIBUTED SYSTEMS
CHALLENGES
1. Looking up Services2. Managing API Complexity
3. Managing Communication Complexity4. Integrating With Other Systems
5. Managing Security6. Minimizing Coordination & Data Coupling
SERVICE DISCOVERY- INVERSION OF CONTROL
- CLIENT-SIDE OR SERVER-SIDE- FAVOR AP-BASED TOOLS
HOW CAN WE MANAGE
API COMPLEXITY?
Be conservativein what you do,
be liberal in what youaccept from others.
— Jon Postel
CONSIDER USING AN
ANTI-CORRUPTION LAYER(CLASSIC DDD PATTERN)
CONSIDER USING AN
API GATEWAYTO SIMPLIFY CLIENT COMMUNICATION
MANAGING THE
COMPLEXITY OFCOMMUNICATION
ROUTING AND TRANSFORMATION OF STREAMS
INTEGRATINGWITH OTHER SYSTEMS
SYNCHRONOUSCOMMUNICATIONPUTS YOU AT THE OTHERSYSTEM'S MERCY
USE CIRCUIT BREAKERS
ALWAYS APPLY
BACK-PRESSURE
SECURITY MANAGEMENT
The user’s going to pick dancing pigs over
security every time.— Bruce Schneier
AUTHENTICATIONAND
AUTHORIZATION
POSSIBLE SECURITY SCHEMES
> TLS Client Certificates> HTTP Basic Authentication> Asymmetric Request Signing
> HMAC (Hash Message Authentication Code)
Words are very unecessary.
They can only do harm.Enjoy the silence.
— Enjoy the Silence by Martin Gore (Depeche Mode)
MINIMIZE COUPLING&
COMMUNICATION
Silence is not only golden, it is seldom
misquoted.— Bob Monkhouse
GUESS.APOLOGIZE.
COMPENSATE.
IT'S HOW THE WORLD WORKS
WHAT ABOUT
TRANSACTIONS?
In general,application developerssimply do not implement
large scalable applications
assuming distributed transactions.
— Pat Helland
SAGAPATTERN
Upgrade your grey matterTwo free O’Reilly eBooks by Lightbend
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lightbend.com/pov
Reactive RoundtableWorld Tour by Lightbend
lightbend.com/reactive-roundtable
Proof of Value ServiceAccelerate Project Success
