def save(self, filename):
"""Writes in-memory dictionary to GCS a JSON string."""
global profiler
file_path = self.name() + '/' + filename
profiler.add_event(" Loading file...")
gcs_file = CsvFile(file_path)
profiler.add_event(" Loaded. Writing...")
gcs_file.write(self._cache)
self._cache = []
gcs_file = None
profiler.add_event(" save() done.")
