def store(self, oid, serial, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
assert not version
self._lock_acquire()
try:
if oid in self._index:
oserial = self._index[oid]
if serial != oserial:
newdata = self.tryToResolveConflict(
oid, oserial, serial, data)
if not newdata:
raise POSException.ConflictError(
oid=oid,
serials=(oserial, serial),
data=data)
else:
data = newdata
else:
oserial = serial
newserial = self._tid
self._tmp.append((oid, data))
return serial == oserial and newserial or ResolvedSerial
finally:
self._lock_release()
def store(self, oid, serial, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
if version:
raise POSException.Unsupported("Versions aren't supported")
self._lock_acquire()
try:
if oid in self._index:
oserial = self._index[oid][:8]
if serial != oserial:
rdata = self.tryToResolveConflict(oid, oserial, serial,
data)
if rdata is None:
raise POSException.ConflictError(oid=oid,
serials=(oserial,
serial),
data=data)
else:
data = rdata
self._tindex[oid] = self._tid + data
finally:
self._lock_release()
return self._tid
def store(self, oid, serial, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
if version:
# we allow a version to be in use although we don't
# support versions in the storage.
LOG.debug('versions in use with TemporaryStorage although Temporary '
'Storage doesnt support versions')
self._lock_acquire()
try:
if self._index.has_key(oid):
oserial=self._index[oid]
if serial != oserial:
newdata = self.tryToResolveConflict(
oid, oserial, serial, data)
if not newdata:
raise POSException.ConflictError(
oid=oid,
serials=(oserial, serial),
data=data)
else:
data = newdata
else:
oserial = serial
newserial=self._tid
self._tmp.append((oid, data))
return serial == oserial and newserial or ResolvedSerial
finally:
self._lock_release()
def store(self, oid, serial, data, v, txn):
if txn is not self._transaction:
raise POSException.StorageTransactionError(self, txn)
assert not v
if self._cur.get(oid) != serial:
if not (serial is None or self._cur.get(oid) in [None, z64]):
raise POSException.ConflictError(
oid=oid, serials=(self._cur.get(oid), serial), data=data)
self._txn.store(oid, data)
return self._tid
def loadSerial(self, oid, serial, marker=[]):
""" This is only useful to make conflict resolution work.
It does not actually implement all the semantics that a revisioning
storage needs!
"""
with self._lock:
data = self._conflict_cache.get((oid, serial), marker)
if data is marker:
# XXX Need 2 serialnos to pass them to ConflictError--
# the old and the new
raise POSException.ConflictError(oid=oid)
else:
return data[0] # data here is actually (data, t)
def store(self, oid, serial, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
self._lock_acquire()
try:
old = self._index.get(oid, None)
if old is None:
# Hm, nothing here, check the base version:
if self._base:
try:
p, tid = self._base.load(oid, '')
except KeyError:
pass
else:
old = oid, None, None, p, tid
nv=None
if old:
oid, pre, vdata, p, tid = old
if vdata:
if vdata[0] != version:
raise POSException.VersionLockError(oid)
nv=vdata[1]
else:
nv=old
if serial != tid:
raise POSException.ConflictError(
oid=oid, serials=(tid, serial), data=data)
r = [oid, old, version and (version, nv) or None, data, self._tid]
self._tindex.append(r)
s=self._tsize
s=s+72+(data and (16+len(data)) or 4)
if version: s=s+32+len(version)
if self._quota is not None and s > self._quota:
raise POSException.StorageError(
'''<b>Quota Exceeded</b><br>
The maximum quota for this demonstration storage
has been exceeded.<br>Have a nice day.''')
finally: self._lock_release()
return self._tid
def load(self, oid, version=''):
with self._lock:
try:
s = self._index[oid]
p = self._opickle[oid]
return p, s # pickle, serial
except KeyError:
# this oid was probably garbage collected while a thread held
# on to an object that had a reference to it; we can probably
# force the loader to sync their connection by raising a
# ConflictError (at least if Zope is the loader, because it
# will resync its connection on a retry). This isn't
# perfect because the length of the recently gc'ed oids list
# is finite and could be overrun through a mass gc, but it
# should be adequate in common-case usage.
if oid in self._recently_gc_oids:
raise POSException.ConflictError(oid=oid)
else:
raise
def store(self, oid, serial, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
assert not version
with self._lock:
if oid in self._index:
oserial = self._index[oid]
if serial != oserial:
newdata = self.tryToResolveConflict(
oid, oserial, serial, data)
if not newdata:
raise POSException.ConflictError(oid=oid,
serials=(oserial,
serial),
data=data)
else:
data = newdata
else:
oserial = serial
self._tmp.append((oid, data))
def store(self, oid, h64, data, version, transaction):
if transaction is not self._transaction:
raise POSException.StorageTransactionError(self, transaction)
if version:
raise POSException.Unsupported, "Versions aren't supported"
self._lock_acquire()
try:
self.conf_resource.access(self) # Update configuration
# First detect conflicts.
# The "h64" argument, if its value is not 0,
# was previously generated by hash64().
if h64 == HASH0:
# Writing a new object.
is_new = True
else:
# Overwriting an old object. Use the hash to verify
# that the new data was derived from the old data.
is_new = False
event, old_c, old_state, old_hash = self._gwio.load(oid)
old_h64 = self.hash64(old_hash)
if h64 != old_h64:
h = None
if self.debug_conflicts:
h = self._loaded_hashes.get(oid)
if h is None:
h = h64
old_hash = old_h64
error = ("Storing %s based on old data. %s != %s." %
(repr(oid), repr(h), repr(old_hash)))
if self.debug_conflicts:
# Expose the error for debugging..
raise RuntimeError(error)
else:
# Use normal ZODB conflict errors.
raise POSException.ConflictError(error)
# Now unpickle and store the data.
file = StringIO(data)
u = Unpickler(file)
classification = u.load()
state = u.load()
event, new_hash = self._gwio.store(oid, classification, state,
is_new)
new_h64 = self.hash64(new_hash)
if self.debug_conflicts:
self._loaded_hashes[oid] = new_hash
# Remember that this OID changed (for scanning)
tid = self.getTransactionId()
t = self.changed.get(tid)
if t is None:
t = {}
self.changed[tid] = t
t[oid] = 1
finally:
self._lock_release()
return new_h64
