使用 View-Controller-Service 架构在 Grails 中处理运行时错误

发布于 2024-08-22 02:20:26 字数 943 浏览 8 评论 0原文

我有以下情况（当然是简化的）：

MyDomain.groovy:
class MyDomain {
  MyAnotherDomain anotherDomain   // lazy loaded
}

MyService.groovy:
class MyService {

 boolean transactional = true

 def doSomething(id) {
   // ... some code...
 }
}

MYController.groovy:
class MyController {
  def myService
  def doAction = {
    MyDomain aaa = ...GET_IT_FROM_SOMEWHERE...
    try {
      myService.doSomething(id)
    } catch (RuntimeError e) {
      flash.message = 'sorry.guy.your.transaction.was.rollbacked'
    }
    [myData: aaa]
  }
}

doAction.gsp:
<html>
<body>
${myData.anotherDomain}
</body>
</html>

当 doSomething() 抛出 RuntimeException 时，就会发生问题。此 RuntimeException 回滚事务并结束 Hibernate 会话。当我在 RuntimeError 之后渲染 doAction.gsp 时，它会以错误结束，因为无法读取延迟加载的字段 anotherDomain （无会话）。现在你可以说“好吧，不要使用 RuntimeException”，但我需要自动事务回滚。

即使事务服务中发生 RuntimeException，如何保持 Hibernate 会话打开，以便 gsp 中的延迟加载可以正确呈现，有什么想法吗？谢谢。

原文

I have following situation (simplified, of course):

MyDomain.groovy:
class MyDomain {
  MyAnotherDomain anotherDomain   // lazy loaded
}

MyService.groovy:
class MyService {

 boolean transactional = true

 def doSomething(id) {
   // ... some code...
 }
}

MYController.groovy:
class MyController {
  def myService
  def doAction = {
    MyDomain aaa = ...GET_IT_FROM_SOMEWHERE...
    try {
      myService.doSomething(id)
    } catch (RuntimeError e) {
      flash.message = 'sorry.guy.your.transaction.was.rollbacked'
    }
    [myData: aaa]
  }
}

doAction.gsp:
<html>
<body>
${myData.anotherDomain}
</body>
</html>

Problem happens when doSomething() throws RuntimeException. This RuntimeException rollback transaction and ends Hibernate session as well. When I render doAction.gsp after the RuntimeError, it ends with error, because lazy loaded field anotherDomain cannot be read (no session). Now you can say "ok, don't use RuntimeException", but I need the automatic transaction rollback.

Any ideas how to keep Hibernate session open even if RuntimeException happens in transactional service, so that lazy loading in gsp can render properly? Thanks.

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柠檬色的秋千 2024-08-29 02:20:26

如果您的 Hibernate 会话在回滚和 xception 抛出期间被破坏，您可以尝试手动将其重新附加到当前的 Hibernate 会话：

MyController.groovy：

class MyController {
  def myService
  def doAction = {
    MyDomain aaa = ...GET_IT_FROM_SOMEWHERE...
    try {
      myService.doSomething(id)
    } catch (RuntimeError e) {
      flash.message = 'sorry.guy.your.transaction.was.rollbacked'
      if(!aaa.isAttached()) {
        aaa.attach()
      }
    }
    [myData: aaa]
  }
}

希望这适合您的需求。
参考

If your Hibernate session is destroyed during rollback and xception throwing, you can try to manually reattach it to the current Hibernate session:

MyController.groovy:

class MyController {
  def myService
  def doAction = {
    MyDomain aaa = ...GET_IT_FROM_SOMEWHERE...
    try {
      myService.doSomething(id)
    } catch (RuntimeError e) {
      flash.message = 'sorry.guy.your.transaction.was.rollbacked'
      if(!aaa.isAttached()) {
        aaa.attach()
      }
    }
    [myData: aaa]
  }
}

Hope that's suitable for your needs.
Reference

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