*/

        public void waitUntilRunning(boolean expect) {
            while (!running == expect) {
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

                        if (file.exists()) {
                            if (!file.delete()) {
                                // sleep for 10ms just in case this is windows holding a file lock
                                try {
                                    Thread.sleep(10);
                                } catch (InterruptedException ie) {
                                    // ignore
                                }