CacheLoader / DatabaseLoader

Hi,

I need to know how works the DatabaseLoader.

I know that I can configure a DatabaseLoader in a Region by a xml files in this way

        <cache-loader>

        <class-name>com.company.data.DatabaseLoader</class-name>

        <parameter name="URL">

        <string>jdbc:cloudscape:rmi:MyData</string>

        </parameter>

        </cache-loader>

But I don´t know how works DatabaseLoader, how work this in my JDBC connection ?

Do I have to implement a DatabaseLoader ?