The framework will check all available implementations of GridSystemService to obtain available grid systems, rather than merely the first implementation found, to determine if a grid is available for the domain object to be rendered; in other words it uses the chain-of-responsibility pattern. Services are called in the order defined by the @javax.annotation.Priority annotation.

Note though that each concrete implementation must also provide corresponding Wicket viewer components capable of interpreting the grid layout. This is therefore a highly specialized and very deep customisation of the framework.

This service is used by GridService.