def __init__(self, dirname,
attributes = None,
entries = None,
blocklength = 1000,
cache_size = 3,
tries_limit = 200):
"""dirname is system path to the table files"""
self.dirname = dirname
if attributes == None:
attributes = Attributes(dirname = dirname,
blocklength = blocklength,
cache_size = cache_size,
tries_limit = tries_limit)
if entries == None:
entries = Entries(dirname = dirname,
blocklength = blocklength,
cache_size = cache_size,
tries_limit = tries_limit)
self.attributes = attributes
self.entries = entries
self.timestamp = time.time()
self.update()
self._lock = RLock(lockfile = os.path.join(dirname, 'LOCK'),
tries_limit = tries_limit)
class MDTable:
def __init__(self, dirname,
attributes = None,
entries = None,
blocklength = 1000,
cache_size = 3,
tries_limit = 200):
"""dirname is system path to the table files"""
self.dirname = dirname
if attributes == None:
attributes = Attributes(dirname = dirname,
blocklength = blocklength,
cache_size = cache_size,
tries_limit = tries_limit)
if entries == None:
entries = Entries(dirname = dirname,
blocklength = blocklength,
cache_size = cache_size,
tries_limit = tries_limit)
self.attributes = attributes
self.entries = entries
self.timestamp = time.time()
self.update()
self._lock = RLock(lockfile = os.path.join(dirname, 'LOCK'),
tries_limit = tries_limit)
def lock(self):
return self._lock.acquire()
def unlock(self):
self._lock.release()
def load(self):
if os.path.isdir(self.dirname):
if self.lock():
try:
self.attributes.load(self.dirname)
self.entries.load(self.dirname)
self.timestamp = time.time()
self.update()
finally:
self.unlock()
else:
raise CommandException(9, 'Could not acquire table lock %s' % self.dirname)
def save(self):
# mkdir(self.dirname)
if self.lock():
try:
self.update()
self.attributes.save(self.dirname)
self.entries.save(self.dirname)
finally:
self.unlock()
else:
raise CommandException(9, 'Could not acquire table lock %s' % self.dirname)
def update(self):
self.attributeDict = {}
self.typeDict = {}
for i in range(0, len(self.attributes)):
a, t=self.attributes[i] # Was a, t=self.attributes[i].split(' ', 1)
self.attributeDict[a]=i
self.typeDict[a] = t
self.initRowPointer()
def initRowPointer(self):
self.currentRow = 0
if not len(self.entries):
self.currentRow = -1
