Apache Sling as a Microservices Gateway

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Apache Sling as a Microservices Gateway --- Microservices are definitely the hot topic _du jour_ . Everyone ( and their dog ) is using microservices or migrating towards them. However, there is a gap between the enthusiam for microservices and the ability to create and maintain the infrastructure and culture to effectively use microservices. Apache Sling is an innovative web framework built on top of the Java Content Repository (JCR), that uses OSGi for its component model and fosters RESTful application design. And, as we will see, it is also perfect match for a microservices gateway. In this talk we will review the pros and cons of microservices and monoliths, and look for middle road that smaller organisations that follow to use services productively. One of the approaches we will outline and demo is an API gateway built on top of Apache Sling, used to adress the cross-cutting concerns that would otherwise be reimplemented by all microservices.

Technology

http://robert.muntea.nu @rombert
Apache Sling as a Microservices Gateway
Apache Sling as a Microservices Gateway
Robert Munteanu, Adobe Systems
Voxxed Days Bucharest 2016

http://robert.muntea.nu @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

http://robert.muntea.nu @rombert
Agenda
●
Of microservices and monoliths
●
Advantages of microservices
●
Advantages of monoliths
●
A middle ground?
●
Apache Sling primer
●
Meeting Barry
●
Demo Application
●
Conclusion

http://robert.muntea.nu @rombert
Advantages of microservices

http://robert.muntea.nu @rombert
Advantages of microservices – best tool for the job

http://robert.muntea.nu @rombert
Advantages of microservices – always think of failures

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Advantages of microservices – simpler scaling

http://robert.muntea.nu @rombert
Advantages of microservices – faster deployment

http://robert.muntea.nu @rombert
Advantages of microservices – different level of reusability

http://robert.muntea.nu @rombert
Advantages of monoliths – crowdsourced wisdom

http://robert.muntea.nu @rombert
Advantages of 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

http://robert.muntea.nu @rombert
Advantages of monoliths – Latency/Bandwidth

http://robert.muntea.nu @rombert
Advantages of monoliths – Security

http://robert.muntea.nu @rombert
Advantages of monoliths – less operations overhead

http://robert.muntea.nu @rombert
Advantages of monoliths – better code reuse

http://robert.muntea.nu @rombert
Advantages of monoliths – simpler availabilty

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Advantages of monoliths – easier service discovery

http://robert.muntea.nu @rombert
Advantages of monoliths – easier troubleshooting

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A middle ground – value proposition
●
What are you trying to solve with microservices?
●
What level of technical diversity does your
organisation have?
●
Are you confortable with partially embracing
microservices?

http://robert.muntea.nu @rombert
A middle ground – using an API gateway
Provides:
●
Authentication
●
Authorization
●
KPIs
●
Circuit breakers
●
API adaptions
Must be:
●
Lightweight
●
Stateless
●
Extensible

http://robert.muntea.nu @rombert
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

http://robert.muntea.nu @rombert
Apache Sling – Value proposition
●
Content-oriented
●
RESTful
●
Lightweight
●
OSGi-powered
●
Easily deployable

http://robert.muntea.nu @rombert
Apache Sling – Repository view of the world
[sling/redirect]
[sling/redirect]
[blog/welcome]
[blog/page]
/
/content
/content/blog
/content/blog/hello-world

http://robert.muntea.nu @rombert
Apache Sling – gateway through ResourceProviders

http://robert.muntea.nu @rombert
Apache Sling – gateway through ResourceProviders
/
/customers
/inventory
/orders
Customer
µService
Inventory
µService
Orders
µService
Logging
KIPMeasurement
CircuitBreakers
Authentication
Authorization

http://robert.muntea.nu @rombert
Meeting Barry

http://robert.muntea.nu @rombert
Demo application - overview

http://robert.muntea.nu @rombert
Demo Application - authentication

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Demo Application - JWT

http://robert.muntea.nu @rombert
Demo Application – Actual demo!!!!1oneone

http://robert.muntea.nu @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

http://robert.muntea.nu @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

http://robert.muntea.nu @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

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The Apache Sling project has built a number of testing tools which aid in testing applications that are built on top of this framework - REST-based, assembled using OSGi and backed by JCR. We will review how those testing tools fit in with domain-agnostic testing tools such as JUnit and Mockito and what the benefits and pitfalls are when building your own domain-specific tools. Similar techniques apply to projects not using the same technology stack, so the discussion will bring value to all projects which can benefit from domain-specific testing tools.

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Apache Sling is an innovative web framework built on top of the Java Content Repository (JCR), that uses OSGi for its component model and fosters RESTful application design. This talk shows how Sling integrates various standard-based technologies, like OSGi and the Content Repository API for Java to create a coherent framework for web application development. We will walk through the development of a simple application with minimal effort and demonstrate how to productize the resulting application. We will pay special attention to some approaches which are not yet part of mainstream development, such as using OSGi for dependecy injection and JCR for persistence.

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Apache Sling as a Microservices Gateway

1. http://robert.muntea.nu @rombert Apache Sling as a Microservices Gateway Apache Sling as a Microservices Gateway Robert Munteanu, Adobe Systems Voxxed Days Bucharest 2016

2. http://robert.muntea.nu @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. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

4. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

5. http://robert.muntea.nu @rombert Advantages of microservices

6. http://robert.muntea.nu @rombert Advantages of microservices – best tool for the job

7. http://robert.muntea.nu @rombert Advantages of microservices – always think of failures

8. http://robert.muntea.nu @rombert Advantages of microservices – simpler scaling

9. http://robert.muntea.nu @rombert Advantages of microservices – faster deployment

10. http://robert.muntea.nu @rombert Advantages of microservices – different level of reusability

11. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

12. http://robert.muntea.nu @rombert Advantages of monoliths – crowdsourced wisdom

13. http://robert.muntea.nu @rombert Advantages of 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. http://robert.muntea.nu @rombert Advantages of monoliths – Latency/Bandwidth

15. http://robert.muntea.nu @rombert Advantages of monoliths – Security

16. http://robert.muntea.nu @rombert Advantages of monoliths – less operations overhead

17. http://robert.muntea.nu @rombert Advantages of monoliths – less operations overhead

18. http://robert.muntea.nu @rombert Advantages of monoliths – better code reuse

19. http://robert.muntea.nu @rombert Advantages of monoliths – simpler availabilty

20. http://robert.muntea.nu @rombert Advantages of monoliths – easier service discovery

21. http://robert.muntea.nu @rombert Advantages of monoliths – easier troubleshooting

22. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

23. http://robert.muntea.nu @rombert A middle ground – value proposition ● What are you trying to solve with microservices? ● What level of technical diversity does your organisation have? ● Are you confortable with partially embracing microservices?

24. http://robert.muntea.nu @rombert A middle ground – using an API gateway Provides: ● Authentication ● Authorization ● KPIs ● Circuit breakers ● API adaptions Must be: ● Lightweight ● Stateless ● Extensible

25. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

26. http://robert.muntea.nu @rombert Apache Sling – Brief History 2007 Incubation 2009 TLP 2015 Version 8 200x Pre-Apache

27. http://robert.muntea.nu @rombert Apache Sling – Code Statistics

28. http://robert.muntea.nu @rombert Apache Sling – Contributor activity

29. http://robert.muntea.nu @rombert Apache Sling – Value proposition ● Content-oriented ● RESTful ● Lightweight ● OSGi-powered ● Easily deployable

30. http://robert.muntea.nu @rombert Apache Sling – Repository view of the world [sling/redirect] [sling/redirect] [blog/welcome] [blog/page] / /content /content/blog /content/blog/hello-world

31. http://robert.muntea.nu @rombert Apache Sling – gateway through ResourceProviders

32. http://robert.muntea.nu @rombert Apache Sling – gateway through ResourceProviders / /customers /inventory /orders Customer µService Inventory µService Orders µService Logging KIPMeasurement CircuitBreakers Authentication Authorization

33. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

34. http://robert.muntea.nu @rombert Meeting Barry

35. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

36. http://robert.muntea.nu @rombert Demo application - overview

37. http://robert.muntea.nu @rombert Demo Application - authentication

38. http://robert.muntea.nu @rombert Demo Application - JWT

39. http://robert.muntea.nu @rombert Demo Application – Actual demo!!!!1oneone

40. http://robert.muntea.nu @rombert Agenda ● Of microservices and monoliths ● Advantages of microservices ● Advantages of monoliths ● A middle ground? ● Apache Sling primer ● Meeting Barry ● Demo Application ● Conclusion

41. http://robert.muntea.nu @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

42. http://robert.muntea.nu @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

43. http://robert.muntea.nu @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

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