How to share locale environments for multiple applications under Tomcat: Implementation method of LocaleContextHolder synchronization between applications

Tomcat multi-application shared locale environment: implement LocaleContextHolder synchronization between applications

How to share locale between multiple apps deployed on the same Tomcat server? This article will solve the problem of synchronizing LocaleContextHolder between Application A and Application B running in a single Tomcat instance. When App A changes the locale environment, how to make App B's LocaleContextHolder also update?

Challenge: Application A and Application B run on the same Tomcat server, but they are independent applications, each with independent operating environment and context. Therefore, it is impossible to directly access the LocaleContextHolder of Application A to update Application B.

Solution: An inter-application communication mechanism is required to achieve synchronization. This article uses Hessian remote interface calls to implement it.

Implementation steps: This method requires Application A to provide a Hessian interface, allowing Application B to access its LocaleContextHolder information.

1. Application A: Application A needs to expose a Hessian service, which contains a method to return the current Locale.

2. Application B: Application B needs to call the Hessian service provided by Application A. This usually involves getting a bean named BimService . If the Bean is an instance of type BimServiceHessianSpringWithShiro , its setLocale method is called and the Locale object obtained from Application A is passed as a parameter. setLocale method is responsible for updating the LocaleContextHolder of App B.

Code example (conceptual): The specific code implementation depends on how your Hessian configuration and Spring framework are integrated. Here is a simplified conceptual example:

(Apply B code snippet)

 BimService bimService = (BimService) context.getBean("bimService");
if (bimService instance of BimServiceHessianSpringWithShiro) {
    Locale locale = ((BimServiceHessianSpringWithShiro) bimService).getLocale(); // Get Locale from App A
    LocaleContextHolder.setLocale(locale); // Update the Locale of App B
}

Key points: The success of this solution depends on:

• Application A correctly exposes the Hessian service and provides a way to obtain Locale.
• Application B correctly configures and calls Application A's Hessian service.
• setLocale method in BimServiceHessianSpringWithShiro class can correctly update the LocaleContextHolder of Apply B.

It should be noted that this method requires pre-design and implementation of the Hessian interface of application A and the calling logic of application B. This is a relatively complex solution that requires a deep understanding of Hessian and Spring frameworks. Simpler solutions may require consideration of technologies such as shared databases or message queues.

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