The company I work for is an Application Service Provider. Requests to the same software running in a single JVM might be on behalf of any one of these companies. In addition, our middle tier contains services that my be called from several different products and are run on behalf of a user of one of these companies. Operationally, we require the ability to be able to filter based on company, product, possibly the end user or several other criteria.

The TurboFilter provided allows individual values for keys in the MDC to be associated with a logging level. So if the MDC contains a key for the company the TurboFilter can be configured with the name of the company and the corresponding logging level. So if CompanyA's level is set to debug while the default level is error, only debug events for CompanyA will be passed on.