Recently, Spring Integration got Java DSL. How good is it? What are main advantages and disadvantages?

1. Spring Integration:
from XML configuration
to Java DSL

2. Agenda
● Enterprise Application Integration
● Message-oriented middleware
● Spring Integration framework (SI)
● SI Java DSL
– Advantages
– Disadvantages
● Conclusions

3. whoami
Andriy Kryvtsun
● Senior Software Engineer
● 15+ years Java experience
andriy_kryvtsun@epam.com
@akryvtsun

4. Enterprise
Application Integration
(EAI)
● What?
● Where?
● When?

5. EAI styles
File Transfer Shared Database
Remote Procedure
Invocation
Message-oriented
middleware (MOM)

6. MOM components
● Messages
● Channels
● Endpoints
● Transformations
● Routing
● Configuration

7. EAI Patterns

8. Coffee Shop Example
cafe orders order splitter drinks
drinks
router
cold drinks
hot drinks
cold drinks serving
hot drinks serving
prepared drinks
order
aggregator
deliveries

9. MOM implementations
Spring Integration
Mule ESB

10. Spring Integration
● Founded at 2009
●
Lightweight routing and mediation framework
● Low level DSLs
● Tight integration with others Spring projects (Spring
DI, Spring XD, Spring Cloud etc.)

11. DSL types in Spring Integration

12. ● Founded at 2009
● Implements big set of EIPs and endpoints
● Has around 70 contributors
● 8000+ commits in GitHub repo
● The last commit date Apr, 2016

13. ● Founded at 2014
● Implements big set of endpoints and EIPs
● Java 8 lambda support
● 154 commits in GitHub repo
● The last commit date Apr, 2016

14. ● Founded at 2012
● Implements only few endpoints (jms, http, amqp)
● Has 69 commits in GitHub repo
● The last commit date Feb, 2016

15. ● Founded at 2012
● Implements few base endpoints (jms, http, file, jdbc etc.)
● Has 220 commits in GitHub repo
● The last commit date Jun, 2013

16. XML and Java DSL
Demo

17. Numbers Polling
Consumer
Even
Numbers
Filter
Header fields
Enricher
Wire Tap
Output
Number to
String
transformer
File Output
Even Numbers Processor

18. Java DSL
Advantages
● expressiveness
● strict types
● compatibility with Java 8 lambdas, Spring Java DSL
and Spring Boot

19. Java DSL
Disadvantages

20. Header fields
Enricher
Wire Tap
Output
Number to
String
transformer
File Output
FTP OutputNumber to
String
transformer
Numbers Polling
Consumer
Even
Numbers
Router ‘TRUE’
‘FALSE’
Prime
Numbers
Filter
Even and Prime Numbers Processor

21. 1. Verbosity

22. 1. Verbosity
Solution
- flow splitting
- bean logic encapsulation

23. 2. Limitation

24. Header fields
Enricher
Wire Tap
Output
Number to
String
transformer
File Output
FTP Output
Number to
String
transformerNumbers Polling
Consumer
Number
Type
Router
JDBC Output
Even
Number
Channel
Prime
Number
Channel
Palindrome
Number
Channel
Null
Channel
File Name
Enricher

25. 2. Limitation
Solution
- use hybrid configuration
- do it yourself

26. Repositories structure

27. Conclusions

28. References
● 'Enterprise Integration Patterns' book by Gregor Hohpe
– http://www.enterpriseintegrationpatterns.com
● 'Spring Integraion in Action' book by Mark Fisher, Jonas Partner
● http://projects.spring.io/spring-integration
– https://github.com/spring-projects/spring-integration
● Stack Overflow 'spring-integration' tag
http://stackoverflow.com/questions/tagged/spring-integration

29. Questions