Refactor: Migrate from AsyncRestTemplate to WebClient

[YongGoose]

Description

The current implementation uses AsyncRestTemplate, which has been deprecated since Spring 5 and removed in Spring 6 / Spring Boot 3.

incubator-seata/namingserver/src/main/java/org/apache/seata/namingserver/config/WebConfig.java

Line 59 in 62aa6af

public AsyncRestTemplate asyncRestTemplate(RestTemplate restTemplate) {

To ensure long-term compatibility and improved performance, we should migrate to WebClient, which provides a fully non-blocking, reactive approach.

Why Change?

• AsyncRestTemplate is no longer maintained and will be removed in future Spring versions.
• WebClient is the recommended replacement, offering better performance, flexibility, and built-in support for reactive programming.
• Improved error handling, timeout management, and request customization compared to AsyncRestTemplate.

Tasks

• Identify all instances of AsyncRestTemplate in the codebase.
• Replace them with WebClient, ensuring equivalent functionality.
• Test the changes to verify expected behavior.
• Update documentation if necessary.

References

• Spring Document

[YongGoose]

@funky-eyes

If you believe this issue should be addressed, please add it as a sub-issue under the below issue and assign me :)

• Comprehensive Refactoring of the seata Project #7177

[funky-eyes]

webclient will rely on spring-reactor, and its encoding method is very different from the current synchronous request model. I think it is more appropriate to use asynchronous callback, so I use AsyncRestTemplate

[YongGoose]

webclient will rely on spring-reactor, and its encoding method is very different from the current synchronous request model. I think it is more appropriate to use asynchronous callback, so I use AsyncResetTemplate

Thanks for your comment!
I've decided that this refactoring is unnecessary, so I will close the issue.