def __init__(self, file=None, items=None, repair=False, readonly=False):
"""(File:str:None, [(str:str)], boolean)
"""
if file is None:
file = File()
assert not readonly
assert not repair
elif not hasattr(file, 'seek'):
file = File(file, readonly=readonly)
if not readonly:
file.obtain_lock()
file.seek(0, 2) # seek end
if file.tell() == 0:
# The file is empty.
for result in self.generate_shelf(file=file, items=items or []):
pass
else:
assert items is None
# The file is not empty.
assert self.has_format(file)
self.file = file
self.file.seek(len(self.prefix))
n = read_int8(self.file) # bytes in first transaction
self.file.seek(self.file.tell() + n)
self.offset_map = OffsetMap(self.file)
# Initialize the memory index.
self.memory_index = {}
while True:
transaction_offsets = read_transaction_offsets(
self.file, repair=repair)
if transaction_offsets is None:
break
self.memory_index.update(transaction_offsets)
self.file.seek_end()
self.unused_name_generator = None
def __init__(self, file=None, items=None, repair=False, readonly=False):
"""(File:str:None, [(str:str)], boolean)
"""
if file is None:
file = File()
assert not readonly
assert not repair
elif not hasattr(file, 'seek'):
file = File(file, readonly=readonly)
if not readonly:
file.obtain_lock()
file.seek(0, 2) # seek end
if file.tell() == 0:
# The file is empty.
for result in self.generate_shelf(file=file, items=items or []):
pass
else:
assert items is None
# The file is not empty.
assert self.has_format(file)
self.file = file
self.file.seek(len(self.prefix))
n = read_int8(self.file) # bytes in first transaction
self.file.seek(self.file.tell() + n)
self.offset_map = OffsetMap(self.file)
# Initialize the memory index.
self.memory_index = {}
while True:
transaction_offsets = read_transaction_offsets(self.file,
repair=repair)
if transaction_offsets is None:
break
self.memory_index.update(transaction_offsets)
self.file.seek_end()
self.unused_name_generator = None
def __init__(self, file=None, readonly=False, repair=False):
"""(file:str=None, readonly:bool=False, repair:bool=False)
If file is empty (or None), a temporary file will be used.
"""
self.oid = -1
if file is None:
file = File()
assert not readonly
assert not repair
elif not hasattr(file, 'seek'):
file = File(file, readonly=readonly)
if not readonly:
file.obtain_lock()
self.fp = file
self.pending_records = {}
self.pack_extra = None
self.fp.seek(0, 2)
if self.fp.tell() != 0:
assert self.has_format(self.fp)
else:
# Write header for new file.
self.fp.seek(len(self.MAGIC))
self._write_header(self.fp)
self._write_index(self.fp, {})
self.index = {}
self._build_index(repair)
max_oid = -1
for oid in self.index:
max_oid = max(max_oid, str_to_int8(oid))
self.oid = max_oid
self.invalid = set()
