The document outlines a presentation on microservices and monoliths, discussing their advantages and disadvantages, with emphasis on microservices as a modern approach to software architecture. It introduces Apache Sling as a content-oriented, extensible, and easily deployable solution while addressing the role of API gateways in facilitating microservices deployment. Key takeaways include understanding the trade-offs of microservices and the potential benefits of leveraging Apache Sling in organizational contexts.

1. #Devoxx #ApacheSling @rombert
Do you really want to go fully micro?
Do you really want to go fully
micro?
Robert Munteanu
Adobe

2. #Devoxx #ApacheSling @rombert
Who I am

$DAYJOB

Adobe Experience Manager
 Apache Sling
 Apache Jackrabbit
 Apache Felix

Open Source

Apache Sling

MantisBT

Mylyn Connector for MantisBT

Mylyn Connector for Review Board

3. #Devoxx #ApacheSling @rombert
Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo Application
●
Conclusion

4. #Devoxx #ApacheSling @rombert
Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo Application
●
Conclusion

5. #Devoxx #ApacheSling @rombert
Microservices – the cool factor

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Microservices – best tool for the job

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Microservices – always think of failures

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Microservices – simpler scaling

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Microservices – different reusability

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Microservices – faster deployment

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Microservices – faster delivery
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8
Release Release Release
Week 1h Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8
Search
Catalogue
Payment
Payment Search
Payment
Catalogue
Payment
Search
Payment
Payment Search
Catalogue
Payment
Payment

12. #Devoxx #ApacheSling @rombert
Monoliths – crowdsourced wisdom

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Monoliths – less distributed computing
1. The network is reliable
2. Latency is zero
3. Bandwidth is infinite
4. The network is secure
5. Topology doesn't change
6. There is one administrator
7. Transport cost is zero
8. The network is homogeneous
The Eight Fallacies of Distributed Computing, Peter Deutsch, 1994

14. #Devoxx #ApacheSling @rombert
Monoliths – Latency/Bandwidth

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Monoliths – Security

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Monoliths – less operations overhead

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Monoliths – less operations overhead

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Monoliths – better code reuse

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Monoliths – simpler availability
Ordering
Search
Catalogue
User Preferences

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Monoliths – easier service discovery

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Monoliths – easier troubleshooting

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Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo Application
●
Conclusion

23. #Devoxx #ApacheSling @rombert
Microservices and microservices

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How to choose?
●
What are you trying to solve with microservices?
●
What level of technical diversity does your organisation have?
●
Are you comfortable with partially embracing microservices?

25. #Devoxx #ApacheSling @rombert
Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo Application
●
Conclusion

26. #Devoxx #ApacheSling @rombert
A middle ground – using an API gateway
Provides:
●
Authentication
●
Authorization
●
KPIs
●
Circuit breakers
Must be:
●
Lightweight
●
Stateless
●
Extensible

27. #Devoxx #ApacheSling @rombert
Middle ground – transparent API gateway
API Gateway
Billing Microservice
Consumer
PUT /payments/
PUT /payments/
201 Created
Content-Type: application/json
201 Created
Content-Type: application/json

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A middle ground – an advanced gateway
Provides:
●
Adapter for API changes
●
Protocol/format unification
●
Call batching for reduced network usage

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A middle ground – transforming API gateway
API Gateway
Catalog Microservice
Consumer
GET /special-offers
GET /special-offers
200 OK
Content-Type: application/json
200 OK
Content-Type: application/json
Search microservice
GET /search/?q=special
200 OK
Content-Type: application/xml

30. #Devoxx #ApacheSling @rombert
Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo Application
●
Conclusion

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Apache Sling – Brief History
2007
Incubation
2009
TLP
2015
Version 8
200x
Pre-Apache

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Apache Sling – Code Statistics

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Apache Sling – Contributor activity

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Apache Sling – Value proposition
●
Content-oriented/RESTful
●
Lightweight
●
Extensible
●
Easily deployable

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Sling – Repository view of the world
[sling/redirect]
[catalog/welcome]
[catalog/category]
[page/specials]
/
/catalog
/catalog/watches
/special-offers

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Sling – ResourceProviders
/
/customers
/inventory
/orders
Customer
µService
Inventory
µService
Orders
µService
Logging
KPIs
CircuitBreakers
Authentication
Authorization

37. #Devoxx #ApacheSling @rombert
Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo application
●
Conclusion

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Demo application - overview

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Demo application - authentication

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Demo application - JWT

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Demo application – Actual demo!!!!one

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Agenda
●
Microservices and monoliths
●
Microservices and microservices
●
A middle ground?
●
Apache Sling primer
●
Demo Application
●
Conclusion

43. #Devoxx #ApacheSling @rombert
Conclusions – Apache Sling
●
Eventing, Thread Pooling, Job Management, Caching
●
Scripting: Groovy, Scala, JSP, Sightly, Java, Ruby, Thymeleaf
●
Flexible resource rendering with resource types
●
Very extensible due to being internally powered by OSGi – most
extension points available to clients

44. #Devoxx #ApacheSling @rombert
Conclusions – Microservices
●
Microservices are a useful tool, but make sure you understand the
tradeoffs
●
Microservices are not an all-or-nothing proposition, pick what is
best for your organisation
●
An API gateway can bring a lot of value to a microservices
deployment
●
Try Apache Sling today

45. #Devoxx #ApacheSling @rombert
Resources
●
Apache Sling – https://sling.apache.org
●
Apache Jackrabbit
●
https://jackrabbit.apache.org
●
http://jackrabbit.apache.org/oak/
●
JWT – https://jwt.io
●
Netflix Hystrix - https://github.com/Netflix/Hystrix