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Code Issues Releases Wiki Activity

Lazy transactions

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This commit is contained in:
Jonas Borgström 2011-09-05 21:30:21 +02:00
parent f9bdd72848
commit f56b6bf4cc
1 changed files with 15 additions and 5 deletions
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20
darc/store.py
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@ -93,15 +93,18 @@ def _available_indices(self, reverse=False):
names.sort(reverse=reverse)
return names
def open_index(self, head):
def open_index(self, head, read_only=False):
if head is None:
self.index = NSIndex.create(os.path.join(self.path, 'index.tmp'))
self.segments = {}
self.compact = set()
else:
shutil.copy(os.path.join(self.path, 'index.%d' % head),
os.path.join(self.path, 'index.tmp'))
self.index = NSIndex(os.path.join(self.path, 'index.tmp'))
if read_only:
self.index = NSIndex(os.path.join(self.path, 'index.%d') % head)
else:
shutil.copy(os.path.join(self.path, 'index.%d' % head),
os.path.join(self.path, 'index.tmp'))
self.index = NSIndex(os.path.join(self.path, 'index.tmp'))
hints = read_msgpack(os.path.join(self.path, 'hints.%d' % head))
if hints['version'] != 1:
raise ValueError('Unknown hints file version: %d' % hints['version'])
@ -185,10 +188,11 @@ def recover(self, path):
def rollback(self):
"""
"""
self._active_txn = False
self.io = LoggedIO(self.path, self.max_segment_size, self.segments_per_dir)
if self.io.head is not None and not os.path.exists(os.path.join(self.path, 'index.%d' % self.io.head)):
self.recover(self.path)
self.open_index(self.io.head)
self.open_index(self.io.head, read_only=True)
@deferrable
def get(self, id):
@ -200,6 +204,9 @@ def get(self, id):
@deferrable
def put(self, id, data):
if not self._active_txn:
self._active_txn = True
self.open_index(self.io.head)
try:
segment, _ = self.index[id]
self.segments[segment] -= 1
@ -214,6 +221,9 @@ def put(self, id, data):
@deferrable
def delete(self, id):
if not self._active_txn:
self._active_txn = True
self.open_index(self.io.head)
try:
segment, offset = self.index.pop(id)
self.segments[segment] -= 1