def __init__(self, archive, sessionname, readonly=False, fsSurrogate=None):
"construct a mapping corresponding to self session name"
if fsSurrogate is None:
fsSurrogate = fileSystemSurrogate.chooseSurrogate()
self.fsSurrogate = fsSurrogate
self.archive = archive
self.sessionname = sessionname
self.readonly = readonly
# building the shadow stack from the bottom up:
# get the base/active mapping
result = archive.baseMapping()
# shadow with the Transient Active if present
transient = archive.transientMapping()
if transient is not None:
if self.verbose:
print "transient found", transient.lastIndex(), transient.filename
result = shadowTree(transient, result)
else:
if self.verbose:
print "no transient found"
# shadow with the union of all recent/active
# and any recent/waiting for self transaction if present.
recent = archive.recentMapping(sessionname)
if recent is not None:
if self.verbose:
print "recent found", recent.filename
result = shadowTree(recent, result)
# shadow with undecided/active for self transaction (create it unless readonly)
self.undecided = undecided = archive.undecidedTree(sessionname, readonly)
if undecided is not None:
if self.verbose:
print "undecided found", undecided.filename
result = shadowTree(undecided, result)
self.tree = result
def __init__(self, path, create=False, check=True, fsSurrogate=None):
"Open or create archive."
#pr "opening archive", (path, create, check)
if fsSurrogate is None:
fsSurrogate = fileSystemSurrogate.chooseSurrogate()
self.fsSurrogate = fsSurrogate
self.path = path
if not fsSurrogate.isdir(path):
if create:
fsSurrogate.mkdir(path)
else:
raise ValueError, "no such archive directory "+repr(path)
# check or create file system layout
if create:
self.tryDestroy()
for (level, collections) in FSLAYOUT.items():
lpath = fsSurrogate.join(path, level)
try:
fsSurrogate.mkdir(lpath)
except OSError:
pass
for collection in collections:
cpath = fsSurrogate.join(lpath, collection)
##pr "making", cpath
try:
fsSurrogate.mkdir(cpath)
##pr "made"
except OSError:
pass
# insert empty active base mapping
timestamp = self.newTimeStamp()
# "NEW TIMESTAMP", timestamp
bname = self.baseName(timestamp)
kt = fTree.makeEmptyTree(bname)
if check:
for (level, collections) in FSLAYOUT.items():
lpath = fsSurrogate.join(path, level)
if not fsSurrogate.exists(lpath):
raise ValueError, "no such archive/level directory "+repr(lpath)
for collection in collections:
cpath = fsSurrogate.join(lpath, collection)
if not fsSurrogate.exists(cpath):
raise ValueError, "no such archive/level/collection dir"+(
repr(cpath))
# check for active transient and base mappings
currentBaseName = self.currentBaseName()
if currentBaseName is None:
raise ValueError, "can't find current base mapping file on init"
#currentTransientName = self.currentTransientName()
# create these when needed
self.Base = None
self.Transient = None
self.TransientIsEmpty = False
self.Recent = None
self.RecentIsEmpty = False
