Question

在Grails 2.3.7上，一个服务公开了几个装饰器方法：

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

我想用这些装饰器方法配置服务，如下所示：

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

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

有没有办法实现这个目标？

更新

感谢Ian的suggestion，我得到了这个通用的解决方案：

@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')}"
  }

将cacheDecorator配置为MethodInvokingFactoryBean，返回单cacheManager，以安全地调用其方法。

Answer 1

如果你只是想确保在调用getter方法之前正确设置了cacheManager，那么你可以在配置级别上用

这样做。

cacheManager(CacheManager) { ... }

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

pdfProcessor(PDFProcessor) {
  documentCache = pdfDocumentCache
}

dependsOn应确保在getROCache bean初始化之前不调用静态cacheManager方法。

Spring bean配置使用来自另一个bean的静态方法与grails DSL

更新

1 个答案: