This document discusses microservices and modularity. It notes that microservices allow applications to be easy to understand, change, scale, use different languages and stacks, and provide resilience through fault tolerance. It discusses using OSGi and Apache Karaf to achieve modularity, including separating code from deployment and dynamic updating of services. The document advocates for modularity in applications whether through microservices, containers like OSGi, or other means even without root access.

1. Microservices, ‘enterprise’
and Conway’s law
Maciek Próchniak

2. Whoami?

3. Maciek Próchniak
Algebraic topology
hocolim
Group cohomology
Monads
GWT
TouK
Camel
OSGi
CQRS
Scala

4. Microservices - new game in town

5. Microservices - new game in town
Netflix
Docker
LinkedIn
Kubernetes
etcd
mesos
puppet
puppet
AWS
kibana
hystrix
kafkaSpring Boot

6. Microservices?
Order
Promotions
Warehouse
User

7. Microservices - new game in town
● easy to understand
● easy to change
● easy to scale
● can use different languages/stacks
● resilience - fault tolerance

8. No docker on mesos??
SUCKERS...

9. How tall do you need to be?

10. Dev - Ops? Continous delivery?

11. Mature IT is…
● Release managment
● Separate development from operations

12. There are two people with permissions to create VM
One is on holiday
The other one is very busy...

13. THEY still think SOA & ESB

14. … but THEY don’t like each other ...

15. Conway’s law
organizations which design systems
are constrained to produce designs
which are copies of the communication structures of
these organizations

16. Vendors vs in-house dev

17. In-house dev

18. Vendors

19. Choices?
● find (really) powerful ally
● change job
● sit down and think...

20. What can be saved in ‘enterprise’
● easy to understand
● easy to change
● easy to scale
● can use different languages/stacks
● resilience - fault tolerance

21. Microservices?
Just another way to build
modular applications

22. Modular??
Modular development
Modular packaging
Modular deployment

23. Modular - code level

24. Modular - microservice

25. Modular - java container

26. Java is already ‘container’
Write once,
run everywhere...
(™)

27. Polyglot - why not?
java
scala
groovy
clojure
nashorn
jython, frege, jhaskell, erjang, jruby, ...

28. Modular java??
Jigsaw? Java 9?

29. OSGi - just how old r’u?
● standards
● static part - access and versioning
● dynamic part - services
● bad fame

31. OSGi - static part
● module i.e. bundle
● exports & imports
● versioning hell

32. OSGi - what is a bundle?

33. Versioning? REST??

34. OSGi - static part - bad fame
● libraries ignore OSGi
● hibernate??
● tooling support
○ bnd
○ eclipse/intelliJ
○ mvn

35. OSGi - bundles

36. Microservices?

37. OSGi - dynamic part
● often forgotten
● hides many nice gems
● µ-services they call them :)

38. OSGi - dynamic part

39. OSGi - dynamic part
● frameworks
○ blueprint
○ declarative services

40. OSGi - blueprint

41. OSGi - declarative services

42. OSGi - lifecycle
● code hot-swap
● service start/stop

43. OSGi - lifecycle

44. OSGi - configuration
● *.properties
● file backed
● dynamic update

45. OSGi - configuration

46. OSGi - dynamic part

47. Microservices?

48. When one VM is not enough?

49. DOSGi - scalability, discovery

50. DOSGi - next EJB?
Fallacies of distributed computing?

51. Apache Karaf?
● microcontainer
● OSGi framework + modules

52. Apache Karaf?

53. Karaf shell

54. Hawtio

55. Hawtio

57. Profiles

58. Profiles

59. Environment in git
config
- preprod
- prod
feature
- calendar
- e-payments

60. Karaf pipeline vision
Nexus

61. Karaf pipeline vision

62. OSGi + Karaf + Profiles
● defer decision to last moment
● separate code from deployment
● build on standards
● … and OSS

63. OSGi - limits
● resilience - fault tolerance?
● easy to change?

64. Thread::stop

65. Hotdeploy - blessing or a curse
Development?
...better than JRebel!
Deployment?
… when did we managed to restart???

66. Still want unmodifiable containers
… maybe except for configuration

67. How much is left out?
● easy to understand
● easy to change
● easy to scale
● can use different languages/stacks
● resilience - fault tolerance

68. Modularity
just because you don’t have root access
doesn’t mean you cannot build modular applications...

70. Дякую
@mpproch
mpr@touk.pl
http://github.com/mproch

71. ● http://www.osgi.org/Main/HomePage
● http://karaf.apache.org/
● http://hawt.io/

72. ● https://www.flickr.com/photos/wallyg/694715940/in/photolist-8WbnU3-8foQ5o-6sQcG4-7xzmMK-6SK7Py-4DCS7t-6FY31J-fQ1JYV-9L9nm8-24oAR3-5fGcNH-4VAr2p-k2zUu9-5dRa1X-
4DCRMa-4rQd9k-accvf8-4LWiVT-ah8viP-fMxemF-86yAWa-8D9Lyq-6xXWJB-oKp9q2-86yFNF
● http://www.rebellesociety.com/wp-content/uploads/2013/09/WaitingForGodotW-1024x768.jpg
● https://farm8.staticflickr.com/7226/7402624046_7e8f5ba62f_z_d.jpg
● http://martinfowler.com/articles/enterpriseREST/images/service-diamond-dependency.png
● http://pixabay.com/static/uploads/photo/2014/05/30/17/37/hipster-358479_640.jpg
● https://farm1.staticflickr.com/143/320928712_a50ef836c1_z_d.jpg?zz=1
● http://upload.wikimedia.org/wikipedia/commons/3/3e/K2_south_routes.jpg
● https://farm2.staticflickr.com/1240/714170839_c25ae0026e_z_d.jpg?zz=1
● https://farm9.staticflickr.com/8089/8438863370_f90b37bfb1_z_d.jpg