_onInit() {
        // @NOTE: get the resources of my type e.g. posts.
        const resources = this.resources.getAllByType(this.resourceType);

        debug('_onInit', this.resourceType, resources.length);

        for (const resource of resources) {
            this._try(resource);
        }
    }
@description Listener which get's called when the resources were fully fetched from the database.

Each url generator will be called and can try to own resources now.

@private