type ConfigGenerator interface {
    // BuildListeners returns the list of inbound/outbound listeners for the given proxy. This is the LDS output
    // Internally, the computation will be optimized to ensure that listeners are computed only
    // once and shared across multiple invocations of this function.
    BuildListeners(node *model.Proxy, push *model.PushContext) []*v2.Listener

    // BuildClusters returns the list of clusters for the given proxy. This is the CDS output
    BuildClusters(node *model.Proxy, push *model.PushContext) []*v2.Cluster

    // BuildHTTPRoutes returns the list of HTTP routes for the given proxy. This is the RDS output
    BuildHTTPRoutes(node *model.Proxy, push *model.PushContext, routeNames []string) []*v2.RouteConfiguration
}