CODEWITHSUNDEEP
javaspringgrailsgroovyspring-dsl
raffian
raffian

Reputation: 32086

Spring bean config using static method from another bean with grails DSL

On Grails 2.3.7, a service exposes several decorator methods:

class CacheManager {
  static ReadOnlyCache getReadOnlyCache(name)
  static ReadWriteCache getReadWriteCache(name)
}

I want to configure services with these decorator methods, something like this:

beans = {
  cacheManager(CacheManager){ ... }

  pdfProcessor(PDFProcessor){
    documentCache = ref('cacheManager').getReadOnlyCache('docscache')
  }
  isbnValidator(ISBNValidator){
    cache = ref('cacheManager').getReadWriteCache('simplecache')
  }

Is there a way to achieve this?

UPDATE

Thanks to Ian's suggestion, I got this generic solution working:

@Singleton
class CacheManager {
  static ReadOnlyCache getReadOnlyCache(name)
  static ReadWriteCache getReadWriteCache(name)
}

beans = {
  cacheManager(CacheManager){ bean ->
    bean.factoryMethod = 'getInstance'

  cacheDecorator(MethodInvokingFactoryBean) { bean ->
    bean.dependsOn = ['cacheManager']
    targetClass = CacheManager
    targetMethod = 'getInstance'      
  }

  pdfProcessor(PDFProcessor){
    documentCache = "#{cacheDecorator.getReadOnlyCache('docscache')}"
  }
  isbnValidator(ISBNValidator){
    cache = "#{cacheDecorator.getReadWriteCache('simplecache')}"
  }

Configure cacheDecorator as MethodInvokingFactoryBean, which returns singleton cacheManager, to safely invoke its methods.

Upvotes: 1

Views: 1027

Answers (1)

Ian Roberts
Ian Roberts

Reputation: 122414

If you just want to ensure the cacheManager is properly set up before invoking the getter methods then you could do that purely at the configuration level with something like

cacheManager(CacheManager) { ... }

pdfDocumentCache(MethodInvokingFactoryBean) { bean ->
  bean.dependsOn = ['cacheManager']
  targetClass = CacheManager
  targetMethod = 'getROCache'
  arguments = ['somecache']
}

pdfProcessor(PDFProcessor) {
  documentCache = pdfDocumentCache
}

The dependsOn should ensure the static getROCache method is not called until the cacheManager bean has been initialized.

Upvotes: 2

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