Method close

app/src/main/java/androidx/room/RoomDatabase.java:443–454

Closes the database if it is already open.

()

     * Closes the database if it is already open.
     */
    public void close() {
        if (isOpen()) {
            final Lock closeLock = mCloseLock.writeLock();
            closeLock.lock();
            try {
                mInvalidationTracker.stopMultiInstanceInvalidation();
                mOpenHelper.close();
            } finally {
                closeLock.unlock();
            }
        }
    }

    /**
     * Asserts that we are not on the main thread.