Dynamic layout resolution

[jonas.olsson]

We're thinking of replacing our (ancient) embedded Jasper with an external JasperReports service, but what as the layout selection then moves "out of our hands" I'd like to know if there's any way to influence how the layout is resolved when requesting a report. We're running a multi-tenant application and each tenant may have it's own layout variant, overriding a common default. As layout deployment and selection would no longer be made by our application, is there a way for us to customize the way layouts are resolve so that we could abandon our "deploy layouts for every tenant although 95% of them are identical" approach and have a "true" default a tenant would fall back to if no tenant override was found?