ProgressEvent progressEvent = toFileDownloadProgressEvent(event, descriptor);
        if (progressEvent != null) {
            fileDownloadListeners.getSource().statusChanged(progressEvent);
        }
    }

    private void broadcastBuildPhaseEvent(InternalProgressEvent event, InternalBuildPhaseDescriptor descriptor) {
        ProgressEvent progressEvent = toBuildPhaseEvent(event, descriptor);

                void started(BuildOperationDescriptor buildOperation, OperationStartEvent startEvent) { throw new RuntimeException() }
                void progress(OperationIdentifier operationIdentifier, OperationProgressEvent progressEvent) { throw new RuntimeException() }
                void finished(BuildOperationDescriptor buildOperation, OperationFinishEvent finishEvent) {