Spring Integration: from XML to Java DSL

Spring Integration:from XML configuration

to Java DSL

Agenda

● Enterprise Application Integration● Message-oriented middleware● Spring Integration framework (SI)● SI Java DSL

– Advantages

– Disadvantages

● Conclusions

whoami

Andriy Kryvtsun

● Senior Software Engineer● 15+ years Java experience

andriy_kryvtsun@epam.com@akryvtsun

EnterpriseApplication Integration

(EAI)

● What?● Where?● When?

EAI styles

File Transfer Shared Database

Remote ProcedureInvocation

Message-orientedmiddleware (MOM)

MOM components

● Messages● Channels● Endpoints● Transformations● Routing● Configuration

EAI Patterns

Coffee Shop Example

cafe orders order splitter drinks

drinksrouter

cold drinks

hot drinks

cold drinks serving

hot drinks serving

prepared drinksorder

aggregatordeliveries

MOM implementations

Spring Integration

Mule ESB

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.)

DSL types in Spring Integration

● 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

● 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

● Founded at 2012

● Implements only few endpoints (jms, http, amqp)

● Has 69 commits in GitHub repo

● The last commit date Feb, 2016

● Founded at 2012

● Implements few base endpoints (jms, http, file, jdbc etc.)

● Has 220 commits in GitHub repo

● The last commit date Jun, 2013

XML and Java DSLDemo

Numbers Polling Consumer

Even Numbers

Filter

Header fieldsEnricher

Wire TapOutput

Number toString

transformer

File Output

Even Numbers Processor

Java DSLAdvantages

● expressiveness● strict types ● compatibility with Java 8 lambdas, Spring Java DSL

and Spring Boot

Java DSLDisadvantages

Header fieldsEnricher

Wire TapOutput

Number toString

transformer

File Output

FTP OutputNumber toString

transformer

Numbers Polling Consumer

Even NumbersRouter ‘TRUE’

‘FALSE’

Prime Numbers

Filter

Even and Prime Numbers Processor

1. Verbosity

1. Verbosity

Solution- flow splitting- bean logic encapsulation

2. Limitation

Header fieldsEnricher

Wire TapOutput

Number toString

transformer

File Output

FTP Output

Number toString

transformerNumbers Polling Consumer

NumberType

Router

JDBC Output

Even NumberChannel

Prime NumberChannel

PalindromeNumberChannel

NullChannel

File NameEnricher

2. Limitation

Solution- use hybrid configuration - do it yourself

Repositories structure

Conclusions

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

Questions