Merge "Fix issue with saving protos to disk during shutdown."

     * is useful for when device is powering off.

     */

    @MainThread

    synchronized void saveImmediately(@NonNull String fileName, @NonNull T data) {

    void saveImmediately(@NonNull String fileName, @NonNull T data) {

        synchronized (this) {

            mScheduledFileDataMap.put(fileName, data);

        }

        triggerScheduledFlushEarly();

    }

    @MainThread

    private synchronized void triggerScheduledFlushEarly() {

    private void triggerScheduledFlushEarly() {

        synchronized (this) {

            if (mScheduledFileDataMap.isEmpty() || mScheduledExecutorService.isShutdown()) {

                return;

            }

            // Cancel existing future.

            if (mScheduledFuture != null) {

            // We shouldn't need to interrupt as this method and threaded task

            // #flushScheduledData are both synchronized.

                mScheduledFuture.cancel(true);

            }

        }

        // Submit flush and blocks until it completes. Blocking will prevent the device from

        // shutting down before flushing completes.