making spring groovy

Making Spring Groovy

Contact Info

Ken Kousenken.kousen@kousenit.com@kenkousen

Making Java Groovyhttp://manning.com/kousen

The Spring Framework

Dependency injection

Huge library of “beans”

Open source

The Swiss Army Chainsaw of Frameworks

Hello, Spring!

Not much point

Replaces simple Java with complex Javaand configuration metadata

Need an app with some services...

Managing Accounts

Managing Accounts

Spring manages:Account serviceAccount repositoryTransactionsInjected dependencies

Managing Accounts

Spring provides:jdbcTemplateEmbedded database for testing

Testing

Spring test contextCaches application contextRolls back transactions after each testGreat for testing DAO layers

Spring and Groovy

1. POGOs are Spring beans toobytecodes are bytecodes

Account Demo

Classes:Account.groovy → POGOAccountDAO.java → integrationJdbcAccountDAO.groovy

AccountService.java

Spock tests

Spring and Groovy

2. Refreshable beansUse lang: namespaceDeploy Groovy source codeCan update running system

Mortgage Evaluator

Mortgage Evaluator Demo

Classes:MortgageApplication.groovy

Evaluator.java

JavaEvaluator.java

GroovyEvaluator.groovy → refreshable

Spock tests

Spring and Groovy

3. AOPImplement aspects in Groovy

Tracking Properties

Tracking Properties

Files:POJO.java

ChangeLogger.java

UpdateReporter.groovy

applicationContext.xml

JUnit tests

Spring and Groovy

4. Inline scripted beansBean definitions in config filesA feature looking for an application

Inline scripted beans

Files:Same as AOP, but

bean def in applicationContext.xml

Spring and Groovy

5. BeanBuilder class from Grails(projected to be in Spring 4.0)

Builder syntax for bean config

BeanBuilder

Files:BeanBuilderTests.groovy

(from Grails distribution)

Spring Boot

6. Spring Boot

Sample application (Java) athttp://spring.io/guides/gs/spring-boot/

I added a Groovy demo as well

Conclusions

POGOs are Groovy beans

Unique to dynamic languages in Spring:Refreshable beansInline scripted beansBeanBuilder configuration class

Spring boot looks cool