让Redis支持注解事务回滚（注解事务和redis回滚）

Annotations are a feature in the Java language that provide extra information about code, from a programmer’s perspective, to help them to use the code correctly in their projects. When annotations are used in the context of transactions, it’s known as Annotation-based Transaction Processing.

Annotation-based Transaction Processing allows users to mark methods that are transactional and allows them to define a level of isolation for each transaction. It works by passing the required transaction isolation level as a parameter for the annotation. In this way, users can very easily mark a method and have the transaction level set automatically.

Redis is an in-memory data store and doesn’t natively support the Annotation-based Transaction Processing. However, it is possible to make Redis support Annotation-based Transaction Processing using a few lines of code. This makes it much easier to write applications that make use of Redis and also leverage the advantages of Annotation-based Transaction Processing.

In order to enable Redis to support Annotation-based Transaction Processing, the first step is to enable the transaction API in Redis. This can be done by setting the parameter enable-transactions to yes in the redis.conf file. Then, the next step is to implement a wrapper for the Redis commands that support transactions, such as MULTI, EXEC and DISCARD. This wrapper should be written so that it takes the annotation as a parameter and uses it to set the isolation level appropriately.

Once the wrapper has been written, it should be registered with the RedisJava client. To do this, the annotated commands should be bound to a class that implements the RedisJava client’s CommandListener interface, with the wrapper’s implementation being used as the method body.

At this point, Redis should be set up to support Annotation-based Transaction Processing. All commands that need to be transactional should be marked with an annotation, and then the appropriate transaction isolation level will be set automatically. That way, all that is needed is that the transactional methods are written and marked appropriately and the rest of the code will be able to leverage the benefits of transactions.

In conclusion, making Redis support Annotation-based Transaction Processing requires a few lines of code, but can offer great benefits in terms of making it easier to write applications that make use of Redis. With this setup, users can very easily mark methods and have the transaction level set automatically.