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@crichardson
Service template and
Microservice chassis
Chris Richardson
Founder of Eventuate.io
Founder of the original CloudFoundry.com
Author of POJOs in Action and Microservices Patterns
@crichardson
[email protected]
adopt.microservices.io
Copyright © 2022. Chris Richardson Consulting, Inc. All rights reserved
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@crichardson
Presentation goal
What are the Service template
and Microservice chassis patterns
A walk through the Live Project
series
Demo the service template
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@crichardson
About Chris
http://adopt.microservices.io
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@crichardson
Discounts
35% discount
au35ric
$110 discount coupon
HZCINDYG until 3/23
http://adopt.microservices.io
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@crichardson
Agenda
About the Service Template pattern
About the Microservice Chassis pattern
Live project series: developing a service template and chassis
Demoing a service template
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@crichardson
$ mkdir my-new-service
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@crichardson
Configure build logic
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@crichardson
Configure dependencies
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@crichardson
Configure plumbing
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@crichardson
Configure deployment pipeline
.github/workflows/build.yml
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@crichardson
Only now can you write your
business logic!
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@crichardson
But what about start.spring.io?
Convenient
BUT
Code generator = copy/paste programming
Focussed on the Spring Boot ecosystem
Simplistic, single Gradle project
Generic and flexible - not tailored to your organization’s
requirements or standards
No sample business logic
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@crichardson
About the service template
pattern
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@crichardson
Using a service template to
create a new service
$ gh clone —private
—template myorg/service-template
my-new-service
$ cd my-new-service
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@crichardson
What you get: build logic
Build logic
Gradle dependencies { …. }
Gradle Plugin configuration
Other build logic: GitHub
Actions, scripts, …
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@crichardson
What you get: cross cutting
concerns
Cross-cutting concerns
Observability
Security
Persistence
…
Testing support
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@crichardson
What you get: sample code
Sample application logic
Domain logic: entities,
repositories, services, ….
Adapters:
HTTP Controllers, …
Tests
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@crichardson
Service template implements:
Corporate policies/standards
Industry “best practices”
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@crichardson
Agenda
About the Service Template pattern
About the Microservice Chassis pattern
Live project series: developing a service template and chassis
Demoing a service template
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@crichardson
A service template (or code
generator) = copy/paste
Changing requirements = update each service
individually
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@crichardson
About the microservice
chassis pattern
Implements:
Corporate policies/standards
Industry “best practices”
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@crichardson
Eliminates majority of copy/
paste = small service template
build.gradle.kts
build.gradle.kts
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@crichardson
When requirements change
For example: new version of log4j2
Update microservice chassis and publish a new version
Update service template to use new version
Update each service to use new version
One line change
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@crichardson
Agenda
About the Service Template pattern
About the Microservice Chassis pattern
Live project series: developing a service template and chassis
Demoing a service template
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@crichardson
About the Live Project Series
Service
Template
Service
Chassis
Skeleton application
Implement security
Package as Docker container
Create a microservice chassis
Configure observability
Live project series
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@crichardson
Starting point = skeleton
application
Spring Boot
Spring Data for JPA
Example entity and repository
Persistence tests use Testcontainers to run MySQL
container
…
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Live project 1: configure
observability
Observability = key part of
production readiness
An observable service
exposes its internal state
to enable monitoring, and
troubleshooting
Milestones
https://microservices.io/patterns/#observability
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Live project 2: implement
security
Secure the service API
with JSON Web Tokens
(JWTs)
Milestones
https://microservices.io/patterns/#observability
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Live project 3: Package as a
Docker container
Build, test and publish a
Docker container image to
Github container registry
Milestones
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Live project 4: Create a
microservice chassis
Extract the service
chassis framework for the
service template
Milestones
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End result: service template +
chassis artifacts
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@crichardson
Agenda
About the Service Template pattern
About the Microservice Chassis pattern
Live project series: developing a service template and chassis
Demoing a service template
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Summary: My new Live Project series
teaches you how to develop a service
template and chassis
The service template pattern:
Runnable source template
for a service
Accelerates the creation of
a new service
Implements plumbing,
build logic, ….
Built on a Microservice
chassis
The Microservice chassis
pattern
Contains the bulk of the
plumbing, build logic, ….
Minimizes copy/paste
duplication in the service
template
Simplifies maintenance of
services
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@crichardson
@crichardson [email protected]
adopt.microservices.io
Questions?
35% discount
code
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