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# BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#
-#$Id: back_anydbm.py,v 1.11 2001-11-21 02:34:18 richard Exp $
+#$Id: back_anydbm.py,v 1.35 2002-05-25 07:16:24 rochecompaan Exp $
+'''
+This module defines a backend that saves the hyperdatabase in a database
+chosen by anydbm. It is guaranteed to always be available in python
+versions >2.1.1 (the dumbdbm fallback in 2.1.1 and earlier has several
+serious bugs, and is not available)
+'''
-import anydbm, os, marshal
-from roundup import hyperdb, date, password
+import whichdb, anydbm, os, marshal
+from roundup import hyperdb, date
+from blobfiles import FileStorage
+from roundup.roundup_indexer import RoundupIndexer
+from locking import acquire_lock, release_lock
#
# Now the database
#
-class Database(hyperdb.Database):
- """A database for storing records containing flexible data types."""
+class Database(FileStorage, hyperdb.Database):
+ """A database for storing records containing flexible data types.
- def __init__(self, storagelocator, journaltag=None):
+ Transaction stuff TODO:
+ . check the timestamp of the class file and nuke the cache if it's
+ modified. Do some sort of conflict checking on the dirty stuff.
+ . perhaps detect write collisions (related to above)?
+
+ """
+ def __init__(self, config, journaltag=None):
"""Open a hyperdatabase given a specifier to some storage.
+ The 'storagelocator' is obtained from config.DATABASE.
The meaning of 'storagelocator' depends on the particular
implementation of the hyperdatabase. It could be a file name,
a directory path, a socket descriptor for a connection to a
None, the database is opened in read-only mode: the Class.create(),
Class.set(), and Class.retire() methods are disabled.
"""
- self.dir, self.journaltag = storagelocator, journaltag
+ self.config, self.journaltag = config, journaltag
+ self.dir = config.DATABASE
self.classes = {}
+ self.cache = {} # cache of nodes loaded or created
+ self.dirtynodes = {} # keep track of the dirty nodes by class
+ self.newnodes = {} # keep track of the new nodes by class
self.transactions = []
+ self.indexer = RoundupIndexer(self.dir)
+ # ensure files are group readable and writable
+ os.umask(0002)
+
+ def __repr__(self):
+ return '<back_anydbm instance at %x>'%id(self)
#
# Classes
#
def __getattr__(self, classname):
"""A convenient way of calling self.getclass(classname)."""
- return self.classes[classname]
+ if self.classes.has_key(classname):
+ if __debug__:
+ print >>hyperdb.DEBUG, '__getattr__', (self, classname)
+ return self.classes[classname]
+ raise AttributeError, classname
def addclass(self, cl):
+ if __debug__:
+ print >>hyperdb.DEBUG, 'addclass', (self, cl)
cn = cl.classname
if self.classes.has_key(cn):
raise ValueError, cn
def getclasses(self):
"""Return a list of the names of all existing classes."""
+ if __debug__:
+ print >>hyperdb.DEBUG, 'getclasses', (self,)
l = self.classes.keys()
l.sort()
return l
If 'classname' is not a valid class name, a KeyError is raised.
"""
+ if __debug__:
+ print >>hyperdb.DEBUG, 'getclass', (self, classname)
return self.classes[classname]
#
# Class DBs
#
def clear(self):
+ '''Delete all database contents
+ '''
+ if __debug__:
+ print >>hyperdb.DEBUG, 'clear', (self,)
for cn in self.classes.keys():
- db = os.path.join(self.dir, 'nodes.%s'%cn)
- anydbm.open(db, 'n')
- db = os.path.join(self.dir, 'journals.%s'%cn)
- anydbm.open(db, 'n')
+ for dummy in 'nodes', 'journals':
+ path = os.path.join(self.dir, 'journals.%s'%cn)
+ if os.path.exists(path):
+ os.remove(path)
+ elif os.path.exists(path+'.db'): # dbm appends .db
+ os.remove(path+'.db')
def getclassdb(self, classname, mode='r'):
''' grab a connection to the class db that will be used for
multiple actions
'''
- path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
+ if __debug__:
+ print >>hyperdb.DEBUG, 'getclassdb', (self, classname, mode)
+ return self._opendb('nodes.%s'%classname, mode)
+
+ def _opendb(self, name, mode):
+ '''Low-level database opener that gets around anydbm/dbm
+ eccentricities.
+ '''
+ if __debug__:
+ print >>hyperdb.DEBUG, '_opendb', (self, name, mode)
+
+ # determine which DB wrote the class file
+ db_type = ''
+ path = os.path.join(os.getcwd(), self.dir, name)
if os.path.exists(path):
- return anydbm.open(path, mode)
- else:
+ db_type = whichdb.whichdb(path)
+ if not db_type:
+ raise hyperdb.DatabaseError, "Couldn't identify database type"
+ elif os.path.exists(path+'.db'):
+ # if the path ends in '.db', it's a dbm database, whether
+ # anydbm says it's dbhash or not!
+ db_type = 'dbm'
+
+ # new database? let anydbm pick the best dbm
+ if not db_type:
+ if __debug__:
+ print >>hyperdb.DEBUG, "_opendb anydbm.open(%r, 'n')"%path
return anydbm.open(path, 'n')
+ # open the database with the correct module
+ try:
+ dbm = __import__(db_type)
+ except ImportError:
+ raise hyperdb.DatabaseError, \
+ "Couldn't open database - the required module '%s'"\
+ "is not available"%db_type
+ if __debug__:
+ print >>hyperdb.DEBUG, "_opendb %r.open(%r, %r)"%(db_type, path,
+ mode)
+ return dbm.open(path, mode)
+
+ def _lockdb(self, name):
+ ''' Lock a database file
+ '''
+ path = os.path.join(os.getcwd(), self.dir, '%s.lock'%name)
+ return acquire_lock(path)
+
+ #
+ # Node IDs
+ #
+ def newid(self, classname):
+ ''' Generate a new id for the given class
+ '''
+ # open the ids DB - create if if doesn't exist
+ lock = self._lockdb('_ids')
+ db = self._opendb('_ids', 'c')
+ if db.has_key(classname):
+ newid = db[classname] = str(int(db[classname]) + 1)
+ else:
+ # the count() bit is transitional - older dbs won't start at 1
+ newid = str(self.getclass(classname).count()+1)
+ db[classname] = newid
+ db.close()
+ release_lock(lock)
+ return newid
+
#
# Nodes
#
def addnode(self, classname, nodeid, node):
''' add the specified node to its class's db
'''
- db = self.getclassdb(classname, 'c')
- # now save the marshalled data
- db[nodeid] = marshal.dumps(node)
- db.close()
- setnode = addnode
+ if __debug__:
+ print >>hyperdb.DEBUG, 'addnode', (self, classname, nodeid, node)
+ self.newnodes.setdefault(classname, {})[nodeid] = 1
+ self.cache.setdefault(classname, {})[nodeid] = node
+ self.savenode(classname, nodeid, node)
- def getnode(self, classname, nodeid, cldb=None):
- ''' add the specified node to its class's db
+ def setnode(self, classname, nodeid, node):
+ ''' change the specified node
'''
- db = cldb or self.getclassdb(classname)
+ if __debug__:
+ print >>hyperdb.DEBUG, 'setnode', (self, classname, nodeid, node)
+ self.dirtynodes.setdefault(classname, {})[nodeid] = 1
+
+ # can't set without having already loaded the node
+ self.cache[classname][nodeid] = node
+ self.savenode(classname, nodeid, node)
+
+ def savenode(self, classname, nodeid, node):
+ ''' perform the saving of data specified by the set/addnode
+ '''
+ if __debug__:
+ print >>hyperdb.DEBUG, 'savenode', (self, classname, nodeid, node)
+ self.transactions.append((self._doSaveNode, (classname, nodeid, node)))
+
+ def getnode(self, classname, nodeid, db=None, cache=1):
+ ''' get a node from the database
+ '''
+ if __debug__:
+ print >>hyperdb.DEBUG, 'getnode', (self, classname, nodeid, db)
+ if cache:
+ # try the cache
+ cache_dict = self.cache.setdefault(classname, {})
+ if cache_dict.has_key(nodeid):
+ if __debug__:
+ print >>hyperdb.TRACE, 'get %s %s cached'%(classname,
+ nodeid)
+ return cache_dict[nodeid]
+
+ if __debug__:
+ print >>hyperdb.TRACE, 'get %s %s'%(classname, nodeid)
+
+ # get from the database and save in the cache
+ if db is None:
+ db = self.getclassdb(classname)
if not db.has_key(nodeid):
- raise IndexError, nodeid
+ raise IndexError, "no such %s %s"%(classname, nodeid)
+
+ # decode
res = marshal.loads(db[nodeid])
- if not cldb: db.close()
+
+ # reverse the serialisation
+ res = self.unserialise(classname, res)
+
+ # store off in the cache dict
+ if cache:
+ cache_dict[nodeid] = res
+
return res
- def hasnode(self, classname, nodeid, cldb=None):
- ''' add the specified node to its class's db
+ def hasnode(self, classname, nodeid, db=None):
+ ''' determine if the database has a given node
'''
- db = cldb or self.getclassdb(classname)
+ if __debug__:
+ print >>hyperdb.DEBUG, 'hasnode', (self, classname, nodeid, db)
+
+ # try the cache
+ cache = self.cache.setdefault(classname, {})
+ if cache.has_key(nodeid):
+ if __debug__:
+ print >>hyperdb.TRACE, 'has %s %s cached'%(classname, nodeid)
+ return 1
+ if __debug__:
+ print >>hyperdb.TRACE, 'has %s %s'%(classname, nodeid)
+
+ # not in the cache - check the database
+ if db is None:
+ db = self.getclassdb(classname)
res = db.has_key(nodeid)
- if not cldb: db.close()
return res
- def countnodes(self, classname, cldb=None):
- db = cldb or self.getclassdb(classname)
- return len(db.keys())
- if not cldb: db.close()
- return res
+ def countnodes(self, classname, db=None):
+ if __debug__:
+ print >>hyperdb.DEBUG, 'countnodes', (self, classname, db)
+ # include the new nodes not saved to the DB yet
+ count = len(self.newnodes.get(classname, {}))
+
+ # and count those in the DB
+ if db is None:
+ db = self.getclassdb(classname)
+ count = count + len(db.keys())
+ return count
- def getnodeids(self, classname, cldb=None):
- db = cldb or self.getclassdb(classname)
- res = db.keys()
- if not cldb: db.close()
+ def getnodeids(self, classname, db=None):
+ if __debug__:
+ print >>hyperdb.DEBUG, 'getnodeids', (self, classname, db)
+ # start off with the new nodes
+ res = self.newnodes.get(classname, {}).keys()
+
+ if db is None:
+ db = self.getclassdb(classname)
+ res = res + db.keys()
return res
+
+ #
+ # Files - special node properties
+ # inherited from FileStorage
+
#
# Journal
#
'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
'retire' -- 'params' is None
'''
- entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
- params)
- db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname), 'c')
- if db.has_key(nodeid):
- s = db[nodeid]
- l = marshal.loads(db[nodeid])
- l.append(entry)
- else:
- l = [entry]
- db[nodeid] = marshal.dumps(l)
- db.close()
+ if __debug__:
+ print >>hyperdb.DEBUG, 'addjournal', (self, classname, nodeid,
+ action, params)
+ self.transactions.append((self._doSaveJournal, (classname, nodeid,
+ action, params)))
def getjournal(self, classname, nodeid):
''' get the journal for id
'''
+ if __debug__:
+ print >>hyperdb.DEBUG, 'getjournal', (self, classname, nodeid)
# attempt to open the journal - in some rare cases, the journal may
# not exist
try:
- db = anydbm.open(os.path.join(self.dir, 'journals.%s'%classname),
- 'r')
- except anydbm.open, error:
- if error.args[0] != 2: raise
+ db = self._opendb('journals.%s'%classname, 'r')
+ except anydbm.error, error:
+ if str(error) == "need 'c' or 'n' flag to open new db": return []
+ elif error.args[0] != 2: raise
return []
journal = marshal.loads(db[nodeid])
res = []
for entry in journal:
- (nodeid, date_stamp, self.journaltag, action, params) = entry
+ (nodeid, date_stamp, user, action, params) = entry
date_obj = date.Date(date_stamp)
- res.append((nodeid, date_obj, self.journaltag, action, params))
- db.close()
+ res.append((nodeid, date_obj, user, action, params))
return res
- def close(self):
- ''' Close the Database - we must release the circular refs so that
- we can be del'ed and the underlying anydbm connections closed
- cleanly.
- '''
- self.classes = {}
+ def pack(self, pack_before):
+ ''' delete all journal entries before 'pack_before' '''
+ if __debug__:
+ print >>hyperdb.DEBUG, 'packjournal', (self, pack_before)
+
+ pack_before = pack_before.get_tuple()
+ classes = self.getclasses()
+
+ # TODO: factor this out to method - we're already doing it in
+ # _opendb.
+ db_type = ''
+ path = os.path.join(os.getcwd(), self.dir, classes[0])
+ if os.path.exists(path):
+ db_type = whichdb.whichdb(path)
+ if not db_type:
+ raise hyperdb.DatabaseError, "Couldn't identify database type"
+ elif os.path.exists(path+'.db'):
+ db_type = 'dbm'
+
+ for classname in classes:
+ db_name = 'journals.%s'%classname
+ db = self._opendb(db_name, 'w')
+
+ for key in db.keys():
+ journal = marshal.loads(db[key])
+ l = []
+ last_set_entry = None
+ for entry in journal:
+ (nodeid, date_stamp, self.journaltag, action,
+ params) = entry
+ if date_stamp > pack_before or action == 'create':
+ l.append(entry)
+ elif action == 'set':
+ # grab the last set entry to keep information on
+ # activity
+ last_set_entry = entry
+ if last_set_entry:
+ date_stamp = last_set_entry[1]
+ # if the last set entry was made after the pack date
+ # then it is already in the list
+ if date_stamp < pack_before:
+ l.append(last_set_entry)
+ db[key] = marshal.dumps(l)
+ if db_type == 'gdbm':
+ db.reorganize()
+ db.close()
+
#
# Basic transaction support
def commit(self):
''' Commit the current transactions.
'''
- # lock the DB
- for action, classname, entry in self.transactions:
- # write the node, figure what's changed for the journal.
- pass
- # unlock the DB
+ if __debug__:
+ print >>hyperdb.DEBUG, 'commit', (self,)
+ # TODO: lock the DB
+
+ # keep a handle to all the database files opened
+ self.databases = {}
+
+ # now, do all the transactions
+ for method, args in self.transactions:
+ method(*args)
+
+ # now close all the database files
+ for db in self.databases.values():
+ db.close()
+ del self.databases
+ # TODO: unlock the DB
+
+ # all transactions committed, back to normal
+ self.cache = {}
+ self.dirtynodes = {}
+ self.newnodes = {}
+ self.transactions = []
+
+ def _doSaveNode(self, classname, nodeid, node):
+ if __debug__:
+ print >>hyperdb.DEBUG, '_doSaveNode', (self, classname, nodeid,
+ node)
+
+ # get the database handle
+ db_name = 'nodes.%s'%classname
+ if self.databases.has_key(db_name):
+ db = self.databases[db_name]
+ else:
+ db = self.databases[db_name] = self.getclassdb(classname, 'c')
+
+ # now save the marshalled data
+ db[nodeid] = marshal.dumps(self.serialise(classname, node))
+
+ def _doSaveJournal(self, classname, nodeid, action, params):
+ # serialise first
+ if action in ('set', 'create'):
+ params = self.serialise(classname, params)
+
+ # create the journal entry
+ entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
+ params)
+
+ if __debug__:
+ print >>hyperdb.DEBUG, '_doSaveJournal', entry
+
+ # get the database handle
+ db_name = 'journals.%s'%classname
+ if self.databases.has_key(db_name):
+ db = self.databases[db_name]
+ else:
+ db = self.databases[db_name] = self._opendb(db_name, 'c')
+
+ # now insert the journal entry
+ if db.has_key(nodeid):
+ # append to existing
+ s = db[nodeid]
+ l = marshal.loads(s)
+ l.append(entry)
+ else:
+ l = [entry]
+
+ db[nodeid] = marshal.dumps(l)
+
+ def _doStoreFile(self, name, **databases):
+ # the file is currently ".tmp" - move it to its real name to commit
+ os.rename(name+".tmp", name)
+ pattern = name.split('/')[-1]
+ self.indexer.add_files(dir=os.path.dirname(name), pattern=pattern)
+ self.indexer.save_index()
def rollback(self):
''' Reverse all actions from the current transaction.
'''
+ if __debug__:
+ print >>hyperdb.DEBUG, 'rollback', (self, )
+ for method, args in self.transactions:
+ # delete temporary files
+ if method == self._doStoreFile:
+ if os.path.exists(args[0]+".tmp"):
+ os.remove(args[0]+".tmp")
+ self.cache = {}
+ self.dirtynodes = {}
+ self.newnodes = {}
self.transactions = []
#
#$Log: not supported by cvs2svn $
+#Revision 1.34 2002/05/15 06:21:21 richard
+# . node caching now works, and gives a small boost in performance
+#
+#As a part of this, I cleaned up the DEBUG output and implemented TRACE
+#output (HYPERDBTRACE='file to trace to') with checkpoints at the start of
+#CGI requests. Run roundup with python -O to skip all the DEBUG/TRACE stuff
+#(using if __debug__ which is compiled out with -O)
+#
+#Revision 1.33 2002/04/24 10:38:26 rochecompaan
+#All database files are now created group readable and writable.
+#
+#Revision 1.32 2002/04/15 23:25:15 richard
+#. node ids are now generated from a lockable store - no more race conditions
+#
+#We're using the portalocker code by Jonathan Feinberg that was contributed
+#to the ASPN Python cookbook. This gives us locking across Unix and Windows.
+#
+#Revision 1.31 2002/04/03 05:54:31 richard
+#Fixed serialisation problem by moving the serialisation step out of the
+#hyperdb.Class (get, set) into the hyperdb.Database.
+#
+#Also fixed htmltemplate after the showid changes I made yesterday.
+#
+#Unit tests for all of the above written.
+#
+#Revision 1.30.2.1 2002/04/03 11:55:57 rochecompaan
+# . Added feature #526730 - search for messages capability
+#
+#Revision 1.30 2002/02/27 03:40:59 richard
+#Ran it through pychecker, made fixes
+#
+#Revision 1.29 2002/02/25 14:34:31 grubert
+# . use blobfiles in back_anydbm which is used in back_bsddb.
+# change test_db as dirlist does not work for subdirectories.
+# ATTENTION: blobfiles now creates subdirectories for files.
+#
+#Revision 1.28 2002/02/16 09:14:17 richard
+# . #514854 ] History: "User" is always ticket creator
+#
+#Revision 1.27 2002/01/22 07:21:13 richard
+#. fixed back_bsddb so it passed the journal tests
+#
+#... it didn't seem happy using the back_anydbm _open method, which is odd.
+#Yet another occurrance of whichdb not being able to recognise older bsddb
+#databases. Yadda yadda. Made the HYPERDBDEBUG stuff more sane in the
+#process.
+#
+#Revision 1.26 2002/01/22 05:18:38 rochecompaan
+#last_set_entry was referenced before assignment
+#
+#Revision 1.25 2002/01/22 05:06:08 rochecompaan
+#We need to keep the last 'set' entry in the journal to preserve
+#information on 'activity' for nodes.
+#
+#Revision 1.24 2002/01/21 16:33:20 rochecompaan
+#You can now use the roundup-admin tool to pack the database
+#
+#Revision 1.23 2002/01/18 04:32:04 richard
+#Rollback was breaking because a message hadn't actually been written to the file. Needs
+#more investigation.
+#
+#Revision 1.22 2002/01/14 02:20:15 richard
+# . changed all config accesses so they access either the instance or the
+# config attriubute on the db. This means that all config is obtained from
+# instance_config instead of the mish-mash of classes. This will make
+# switching to a ConfigParser setup easier too, I hope.
+#
+#At a minimum, this makes migration a _little_ easier (a lot easier in the
+#0.5.0 switch, I hope!)
+#
+#Revision 1.21 2002/01/02 02:31:38 richard
+#Sorry for the huge checkin message - I was only intending to implement #496356
+#but I found a number of places where things had been broken by transactions:
+# . modified ROUNDUPDBSENDMAILDEBUG to be SENDMAILDEBUG and hold a filename
+# for _all_ roundup-generated smtp messages to be sent to.
+# . the transaction cache had broken the roundupdb.Class set() reactors
+# . newly-created author users in the mailgw weren't being committed to the db
+#
+#Stuff that made it into CHANGES.txt (ie. the stuff I was actually working
+#on when I found that stuff :):
+# . #496356 ] Use threading in messages
+# . detectors were being registered multiple times
+# . added tests for mailgw
+# . much better attaching of erroneous messages in the mail gateway
+#
+#Revision 1.20 2001/12/18 15:30:34 rochecompaan
+#Fixed bugs:
+# . Fixed file creation and retrieval in same transaction in anydbm
+# backend
+# . Cgi interface now renders new issue after issue creation
+# . Could not set issue status to resolved through cgi interface
+# . Mail gateway was changing status back to 'chatting' if status was
+# omitted as an argument
+#
+#Revision 1.19 2001/12/17 03:52:48 richard
+#Implemented file store rollback. As a bonus, the hyperdb is now capable of
+#storing more than one file per node - if a property name is supplied,
+#the file is called designator.property.
+#I decided not to migrate the existing files stored over to the new naming
+#scheme - the FileClass just doesn't specify the property name.
+#
+#Revision 1.18 2001/12/16 10:53:38 richard
+#take a copy of the node dict so that the subsequent set
+#operation doesn't modify the oldvalues structure
+#
+#Revision 1.17 2001/12/14 23:42:57 richard
+#yuck, a gdbm instance tests false :(
+#I've left the debugging code in - it should be removed one day if we're ever
+#_really_ anal about performace :)
+#
+#Revision 1.16 2001/12/12 03:23:14 richard
+#Cor blimey this anydbm/whichdb stuff is yecchy. Turns out that whichdb
+#incorrectly identifies a dbm file as a dbhash file on my system. This has
+#been submitted to the python bug tracker as issue #491888:
+#https://sourceforge.net/tracker/index.php?func=detail&aid=491888&group_id=5470&atid=105470
+#
+#Revision 1.15 2001/12/12 02:30:51 richard
+#I fixed the problems with people whose anydbm was using the dbm module at the
+#backend. It turns out the dbm module modifies the file name to append ".db"
+#and my check to determine if we're opening an existing or new db just
+#tested os.path.exists() on the filename. Well, no longer! We now perform a
+#much better check _and_ cope with the anydbm implementation module changing
+#too!
+#I also fixed the backends __init__ so only ImportError is squashed.
+#
+#Revision 1.14 2001/12/10 22:20:01 richard
+#Enabled transaction support in the bsddb backend. It uses the anydbm code
+#where possible, only replacing methods where the db is opened (it uses the
+#btree opener specifically.)
+#Also cleaned up some change note generation.
+#Made the backends package work with pydoc too.
+#
+#Revision 1.13 2001/12/02 05:06:16 richard
+#. We now use weakrefs in the Classes to keep the database reference, so
+# the close() method on the database is no longer needed.
+# I bumped the minimum python requirement up to 2.1 accordingly.
+#. #487480 ] roundup-server
+#. #487476 ] INSTALL.txt
+#
+#I also cleaned up the change message / post-edit stuff in the cgi client.
+#There's now a clearly marked "TODO: append the change note" where I believe
+#the change note should be added there. The "changes" list will obviously
+#have to be modified to be a dict of the changes, or somesuch.
+#
+#More testing needed.
+#
+#Revision 1.12 2001/12/01 07:17:50 richard
+#. We now have basic transaction support! Information is only written to
+# the database when the commit() method is called. Only the anydbm
+# backend is modified in this way - neither of the bsddb backends have been.
+# The mail, admin and cgi interfaces all use commit (except the admin tool
+# doesn't have a commit command, so interactive users can't commit...)
+#. Fixed login/registration forwarding the user to the right page (or not,
+# on a failure)
+#
+#Revision 1.11 2001/11/21 02:34:18 richard
+#Added a target version field to the extended issue schema
+#
#Revision 1.10 2001/10/09 23:58:10 richard
#Moved the data stringification up into the hyperdb.Class class' get, set
#and create methods. This means that the data is also stringified for the