How do you solve the failure of spring self calling transaction?

Liu Zhihang 2020-11-09 07:56:24
solve failure spring self calling


Preface

I believe we all encounter a transaction failure scenario , That's it Spring Self calling , Is in the Service In the way , Call another plus @Transactional Method of annotation , Transaction failure found , How do you solve this problem ?

official account :『 Liu Zhihang 』, Record the skills in work study 、 Development and source notes ; From time to time to share some of the life experience . You are welcome to guide !

Things back

It was an afternoon when I forgot what the weather was like , Suddenly a little red dot sprang up , Um. ~ Very anxious little red dot .

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It turns out that the transaction failed !

Mo panic ! Mo panic !

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Finally, the little partner chose to take away , Is my tool class not fragrant ?

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Of course, the result of the story is perfect , Problem solved .

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Business

When it comes to operating multiple tables at the same time in development , Make sure that both operations succeed together , Or fail together , In this case, you need to use transactions .

Now it's generally based on @Transactional Annotated Declarative transactions .

In the process of transaction usage, there are the following considerations :

  1. Transactions can only be applied to public It works in a way ;
  2. Transactions need to be called from outside ,Spring Self calls will fail ;
  3. Suggested transaction notes @Transactional It is usually added to the implementation class .

Of course, these words don't mean me , It is clearly stated in other people's official documents !

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Here's how Only @Transactional Annotations are applied to methods that have public visibility . If you are to accept protected, private o or package-visible The method of decoration uses , It doesn't cause any mistakes , However, the annotated method does not display the configured transaction settings .

To put it bluntly , You used it , No mistake. , But it doesn't work !

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As for the suggestion to add to the implementation class , This is just a suggestion , However, if it is added to an interface class or interface method , Only if you configure an interface based proxy will it take effect . So this one is honest Add to an implementation class or implementation class method Well .

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Because the proxy pattern only intercepts external method calls that are passed in through the proxy , So self calling transactions are not effective .

The official explanation is simple and clear , Although I can't understand , But it doesn't affect my screenshots .

I'd better cut another one ……

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The actual use

But in development , This is often the case with small partners !

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Originally His writing The code is long and smelly , There are all kinds of inspection tags in it 、 Reference 、 Inquire about 、 Validation, etc. , Just thinking about something , Minimize the scope of the transaction package , Just add transactions when updating at the same time !

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That's how it's written , Why ~ IDEA Wrong report , It seems that we can't private modification , Then I'll change it to public.

It's clear that transactions don't work .

Put the updated code in Smelly and long In the code of , Make it stink longer , And then use @Transactional A note with . Perfect solution !

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Please let go of the code ! Here's how to do it .

Solution 1

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I'll just call the external call instead ?

One more statement Service, Put the logic of updating the table in the past .

I usually like to use this method .

Solution 2

Use Programming transactions , I said before. , Use Declarative transactions when , This and that , I can change it !

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You see , I also changed the method to private Modify the , The business also works . Perfect solution !

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In fact, this method is also very good !

Solution 3

I want to use annotations again , What do you want to do with self calling ?

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however ... A little trouble is OK .

We can refer to Programming transactions The way , Don't let the self call , I tune in to external methods , Then the external method can be transferred back to me .

@Component
public class TransactionalComponent {
public interface Cell {
void run() throws Exception;
}
@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
public void required(Cell cell) throws Exception {
cell.run();
}
}

In this way, you can't go through TransactionalComponent Did you call it , And you can use lambda expression .

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Of course, we can do an iteration based on this version , It's using static method calls , Don't use it every time @Autowired Inject once .

public class TransactionalUtils {
private static volatile TransactionalComponent transactionalComponent;
private static synchronized TransactionalComponent getTransactionalComponent() {
if (transactionalComponent == null) {
// Get from container transactionalComponent
transactionalComponent = ApplicationContextUtils.getBean(TransactionalComponent.class);
}
return transactionalComponent;
}
public static void required(TransactionalComponent.Cell cell) throws Exception {
getTransactionalComponent().required(cell);
}
}

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This is done through the tool class TransactionalUtils You can directly call static methods to perform transaction operations .

summary

Conclusion

This article mainly introduces why transactions fail , And how to avoid transaction failure , At the same time, it provides three ways to solve the problem of self calling transaction failure . deficiencies , Welcome to correct .

  1. Spring file :https://docs.spring.io/spring-framework/docs/5.3.0/reference/html/data-access.html#transaction-declarative-annotations
版权声明
本文为[Liu Zhihang]所创,转载请带上原文链接,感谢

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