Nowadays everyone is talking about microservices and how cool they are. That's true, but not all business needs to move to microservices, you can still use monolith architecture and make it more fashion by applying some of the design/elements that you've learned from microservices architecture. Can you use circuit breaker pattern, service isolation, event-driven and non-blocking application, cloud-native approach or zero downtime deployment in monolith architecture? Is it worth? The answer is YES!!!. Come to this session to learn how to make your Java monolith applications attractive again by borrowing some of the principles of microservices architecture.

1. Live Long and Prosper
To Monolith
Alex Soto @alexsotob

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Alex Soto
Red Hat Engineer
www.lordofthejars.com
@alexsotob
Who Am I?

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https://www.manning.com/books/testing-java-microservices

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Questions

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… due to the given burdens of cost and organisational maturity,
microservices will likely never reach the Adopt phase“ Rebecca Parsons - CTO at ThoughtWorks

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Frontend
API Gateway
Game
Microservice
Review
Microservice
Detail
Microservice

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Frontend
Game
Microservice
Review
Microservice
Detail
Microservice
JVM

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Isolation of Code

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Isolation of Code
review
api
impl
detail
api
impl
game
api
impl
public
exposes only what is required
favour low-coupling
private
highly cohesive
reduces our memory footprint
IMPL
API
pmd, code-assert, checkstyle, maven enforcer

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Isolation of Data

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Isolation of Data
game schema
Game
Detail
detail schema
Reviewreview schema
Module == Schema
Joins inside Schema
Referential Integrity across Schemas
Global transactions
flyway, liquibase

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Reactive Extensions

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Reactive Java
Where to Run
Combiner
How to Combine
Final Run

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Network

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Circuit Breaker Pattern

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Circuit Breaker
Defines CB
Wrapped function
Recovery

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DEMO

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Your Stack Matters
Server Hardware
Operating System
Application Server
your.war
Java Virtual Machine
Custom Configuration
Linux Kernel Version & Distribution
Java 1.7.0_67
Tomcat, Wildfly, Jetty
JDBC driver, users

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Infrastructure

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Deploying in Cluster
Always two instances of the image
Docker image to run
Port

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Deploying in Cluster
Reverse Proxy Router
Number of instances LB

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DEMO

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Cloud Native Application

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Infrastructure
sticky session
Shopping Cart User A

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In-Memory Data Grid
In-Memory DataGrid
Shopping Cart User A Shopping Cart User A

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Release as Unicorns

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Release as Unicorns
Build Dockerfile DeployBuild Container Testing in Production Release
s2i, OpenShift, Fabric8, Istio
Teiid, Debezium (Test Prod)

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Let’s Wind Down

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Advantages of monolith
> Local Calls
> All parts always up
> Easy to debug
> Easy to test
> Refactor without running surprises
> You see the real world every time
> Easy to deploy (coordination)
> Polyglot Languages, DB

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Digital Darwinism
Self-Service,
On-Demand,
Elastic,
Infrastructure
as
Code
(Cloud)
Re-Org to
DevOps
Automation
Puppet, Chef,
Ansible
and/or
Kubernetes
CI & CD
Deployment
Pipeline
Advanced
Deployment
Techniques
Microservices

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https://www.slideshare.net/dbryant_uk/oreilly-sacon-ny-2018-continuous-delivery-patterns-for-contemporary-architecture/2
You In The Near Future

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Stats service
User Service
Awards Service
Question Service
Advertise Service
Question Service

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NO, it is a monolith
https://www.infoq.com/news/2015/06/scaling-stack-overflow

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40. “Live Long and Prosper
to Monolith.”
—SPOCK

41. @alexsotob asotobue@redhat.com