def __init__(self, backend):
self.backend = backend
self.fields = {}
self.composites = set()
self.read_lock, self.write_lock = create_locks()
self.format_metadata_cache = defaultdict(dict)
self.formatter_template_cache = {}
self.dirtied_cache = {}
self.dirtied_sequence = 0
self._search_api = Search(self.field_metadata.get_search_terms())
# Implement locking for all simple read/write API methods
# An unlocked version of the method is stored with the name starting
# with a leading underscore. Use the unlocked versions when the lock
# has already been acquired.
for name in dir(self):
func = getattr(self, name)
ira = getattr(func, 'is_read_api', None)
if ira is not None:
# Save original function
setattr(self, '_' + name, func)
# Wrap it in a lock
lock = self.read_lock if ira else self.write_lock
setattr(self, name, wrap_simple(lock, func))
self.initialize_dynamic()