def __init__(self, data_dir, checkpoint_operations=100, checkpoint_timeout=30):
"""
@param data_dir: The directory where DBM files will be stored.
@param data_dir: C{str}
@param checkpoint_operations: Number of operations between syncs.
@type checkpoint_operations: C{int}
@param checkpoint_timeout: Max time (in seconds) that can elapse between sync of cache.
@type checkpoint_timeout: C{float}
"""
QueueStore.__init__(self)
self._opcount = 0
self._last_sync = datetime.now()
self.data_dir = data_dir
self.checkpoint_operations = checkpoint_operations
self.checkpoint_timeout = timedelta(seconds=checkpoint_timeout)
# Should this be in constructor?
# The queue metadata stores mutable (dict) objects. For this reason we set
# writeback=True and rely on the sync() method to keep the cache & disk
# in-sync.
self.queue_metadata = shelve.open(os.path.join(
self.data_dir, 'metadata'), writeback=True)
# Since we do not need mutable objects on the frame stores (we don't modify them, we just
# put/get values), we do NOT use writeback=True here. This should also conserve on memory
# usage, since apparently that can get hefty with the caching when
# writeback=True.
self.frame_store = shelve.open(os.path.join(
self.data_dir, 'frames'), writeback=False)
def __init__(self, data_dir, checkpoint_operations=100, checkpoint_timeout=30):
"""
@param data_dir: The directory where DBM files will be stored.
@param data_dir: C{str}
@param checkpoint_operations: Number of operations between syncs.
@type checkpoint_operations: C{int}
@param checkpoint_timeout: Max time (in seconds) that can elapse between sync of cache.
@type checkpoint_timeout: C{float}
"""
QueueStore.__init__(self)
self._opcount = 0
self._last_sync = datetime.now()
self.data_dir = data_dir
self.checkpoint_operations = checkpoint_operations
self.checkpoint_timeout = timedelta(seconds=checkpoint_timeout)
# Should this be in constructor?
# The queue metadata stores mutable (dict) objects. For this reason we set
# writeback=True and rely on the sync() method to keep the cache & disk in-sync.
self.queue_metadata = shelve.open(os.path.join(self.data_dir, 'metadata'), writeback=True)
# Since we do not need mutable objects on the frame stores (we don't modify them, we just
# put/get values), we do NOT use writeback=True here. This should also conserve on memory
# usage, since apparently that can get hefty with the caching when writeback=True.
self.frame_store = shelve.open(os.path.join(self.data_dir, 'frames'), writeback=False)
def __init__(self):
QueueStore.__init__(self)
self._messages = defaultdict(deque)
def __init__(self):
QueueStore.__init__(self)
self._messages = defaultdict(deque)