JavaOne 2008 - TS-5793 - Groovy and Grails, changing the landscape of Java EE patterns
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JavaOne 2008 - TS-5793 - Groovy and Grails, changing the landscape of Java EE patterns
- 1. Groovy and Grails: Changing the Landscape of Java™ Platform, Enterprise Edition (Java EE Platform) Patterns Graeme Rocher, CTO – G2One Inc Guillaume LaForge, VP of Engineering – G2One Inc TS-5793
- 19. Re-inventing Patterns with the MOP The Data Access Object The Service Locator
- 22. Creating Dynamic SQL Finders Meta Magic with Groovy
- 23. Dynamic SQL Finders Example Book.metaClass. static . methodMissing = { String name, args -> if (name.startsWith("findBy") && args) { def prop = name[6..-1] prop= prop[0].toLowerCase() + prop[1..-1] def callable = { Object[] varArgs -> def results = [] def sql = Sql.newInstance( url, user, pass, driver) sql.eachRow( """select * from ${Book.name} where $prop=?""" , [varArgs[0]]) { results << new Book(title:it.title, author:it.author) } return results } Book.metaClass. "$name" = callable return callable. call(args) } } Intercept Cache Invoke
- 24. Real Life Example: GORM in Grails class Album { String title String artist Date releaseDate static hasMany = [songs:Song] } class Song { String title Double duration } table - album table - song GORM classes, also known as domain classes, go in the domain directory id title artist release_date id title duration album_id
- 25. GORM in Action Querying and Persistence with GORM
- 26. Dynamic Finders & Criteria def albums = Album. list () def recentAlbums = Album. findAllByReleaseDateGreaterThan (new Date()-7) def albumsStartingWithA = Album. findAllByTitleLike ( "A%") def albumsWithSongsAboutSummer = Album. withCriteria { songs { like("title", "%Summmer%") } } List all records Form method expressions Use “like” queries Construct criteria on the fly to query associations
- 31. Automatic Dependency Injection Automatic Dependency Injection with Spring & Grails via Meta-programming
- 32. Real Life Example: Spring & Grails class Book { PurchasingService purchasingService Transaction buyBook(User u) { purchasingService.buyBook(this, u) } } Book. metaClass.constructor = {-> def obj = BeanUtils.instantiateClass(Book) applicationContext .getAutowireCapableBeanFactory() . autowireBeanProperties( obj, AutowireCapableBeanFactory.AUTOWIRE_BY_NAME, false) return obj } Book domain class requires reference to PurchasingService Overriding default constructor for class Autowire dependencies into object from Spring at construction time
- 36. Groovy and Grails: Changing the Landscape of Java™ Platform, Enterprise Edition (Java EE Platform) Patterns Graeme Rocher Guillaume LaForge TS-5793