覆盖Grails插件bean的方法 [英] override method of Grails plugin bean

问题描述

Spring Security插件提供了一个名为'springSecurityService'的bean，其类型为 grails.plugins.springsecurity.SpringSecurityService 。我需要重写此服务的 getCurrentUser 方法。

我首先尝试使用扩展名

  class CustomSecurityService扩展了SpringSecurityService {
 $ b $ @Override 
 Object getCurrentUser（）{
 / /我的实现使用了父类中的方法
 
 
 code $ $ $ $ $ $ $ $ $ $ $ $ <由上面的类的实例插件定义的bean将以下内容添加到 resources.groovy  
  springSecurityService（CustomSpringSecurityService）
  
但这并不奏效，因为没有我设置了 SpringSecurityService （我正在扩展的类）的依赖关系，所以我得到NullPointerExceptions。这些依赖关系没有设置的原因是因为不再有一个类型为 SpringSecurityService  
 
 
 
的Spring bean。于是，我转到授权：
 导入grails.plugins.springsecurity.SpringSecurityService作为PluginSpringSecurityService 
 
类CustomSpringSecurityService {
 
 @Autowired @Delegate 
 PluginSpringSecurityService pluginSpringSecurityService 
 
 Object getCurrentUser（）{
 //我的实现使用pluginSpringSecurityService中的方法
} 
} 
  
然后我在 resources.groovy中定义了两个bean  
 $ p $  springSecurityService（CustomSpringSecurityService）
 pluginSpringSecurityService（grails.plugins.springsecurity.SpringSecurityService）
  

在第二次尝试中，我再次希望名为'springSecurityService'的bean引用 CustomSpringSecurityService ，但我还需要一个类型为 grails.plugins.springsecurity.SpringSecurityService 的bean，因为我的 getCurrentUser <



但是，我再次发现 pluginSpringSecurityService 的依赖关系>没有被设置。是否有更简单的方法来覆盖插件提供的bean在依赖注入的上下文中的方法？

解决方案

回到子类化并重新定义 resources.groovy 中的bean，但满足依赖关系。它们是按名称自动注入的，但都列出来了，所以明确地将它们添加到重定义中：



  springSecurityService（CustomSpringSecurityService）{
 authenticationTrustResolver = ref（'authenticationTrustResolver'）
 grailsApplication = ref（'grailsApplication'）
 passwordEncoder = ref（'passwordEncoder'）
 objectDefinitionSource = ref（'objectDefinitionSource'）
 userDetailsS​​ervice = ref（'userDetailsS​​ervice'）
 userCache = ref（'userCache'）
} 
  




The Spring Security plugin provides a bean named 'springSecurityService' of type grails.plugins.springsecurity.SpringSecurityService. I need to override the getCurrentUser method of this service.

I first tried to do it using extension

class CustomSecurityService extends SpringSecurityService {

    @Override
    Object getCurrentUser() {
        // my implementation uses methods from the parent class
    }
}

To replace the bean defined by the plugin with an instance of the class above I added the following to resources.groovy

springSecurityService(CustomSpringSecurityService)

But this didn't work because none of the dependencies of SpringSecurityService (the class I'm extending) are set so I get NullPointerExceptions. The reason these dependencies are not set is because there's no longer a spring bean of type SpringSecurityService

So, I then turned to delegation:

import grails.plugins.springsecurity.SpringSecurityService as PluginSpringSecurityService

class CustomSpringSecurityService {

    @Autowired @Delegate
    PluginSpringSecurityService pluginSpringSecurityService

    Object getCurrentUser() {
        // my implementation uses methods from pluginSpringSecurityService
    }
}

I then defined two beans in resources.groovy

springSecurityService(CustomSpringSecurityService)
pluginSpringSecurityService(grails.plugins.springsecurity.SpringSecurityService)

In this second attempt, I again want the bean named 'springSecurityService' to refer to CustomSpringSecurityService, but I also need a bean of type grails.plugins.springsecurity.SpringSecurityService, because my implememtation of getCurrentUser use some other methods of that bean.

However, I again found that the dependencies of pluginSpringSecurityService are not being set. Is there an easier way to override a method of a bean provided by a plugin in a context that is subject to dependency injection?

解决方案

Go back to subclassing and redefining the bean in resources.groovy, but satisfy the dependencies. They're auto-injected by name but all listed, so add them explicitly to your redefinition:

springSecurityService(CustomSpringSecurityService) {
   authenticationTrustResolver = ref('authenticationTrustResolver')
   grailsApplication = ref('grailsApplication')
   passwordEncoder = ref('passwordEncoder')
   objectDefinitionSource = ref('objectDefinitionSource')
   userDetailsService = ref('userDetailsService')
   userCache = ref('userCache')
}

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