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annotate roundup/backends/back_anydbm.py @ 460:9c895b44240a

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take a copy of the node dict... so that the subsequent set operation doesn't modify the oldvalues structure
author Richard Jones <richard@users.sourceforge.net>
date Sun, 16 Dec 2001 10:53:38 +0000
parents 7181efddce66
children b579418f7ed1
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 #$Id: back_anydbm.py,v 1.18 2001-12-16 10:53:38 richard Exp $
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19 '''
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20 This module defines a backend that saves the hyperdatabase in a database
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21 chosen by anydbm. It is guaranteed to always be available in python
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22 versions >2.1.1 (the dumbdbm fallback in 2.1.1 and earlier has several
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23 serious bugs, and is not available)
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24 '''
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25
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26 import whichdb, anydbm, os, marshal
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27 from roundup import hyperdb, date, password
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28
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29 DEBUG=os.environ.get('HYPERDBDEBUG', '')
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30
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31 #
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32 # Now the database
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33 #
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34 class Database(hyperdb.Database):
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35 """A database for storing records containing flexible data types.
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36
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37 Transaction stuff TODO:
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38 . check the timestamp of the class file and nuke the cache if it's
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39 modified. Do some sort of conflict checking on the dirty stuff.
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40 . perhaps detect write collisions (related to above)?
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41
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42 """
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43 def __init__(self, storagelocator, journaltag=None):
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44 """Open a hyperdatabase given a specifier to some storage.
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45
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46 The meaning of 'storagelocator' depends on the particular
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47 implementation of the hyperdatabase. It could be a file name,
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48 a directory path, a socket descriptor for a connection to a
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49 database over the network, etc.
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50
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51 The 'journaltag' is a token that will be attached to the journal
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52 entries for any edits done on the database. If 'journaltag' is
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53 None, the database is opened in read-only mode: the Class.create(),
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54 Class.set(), and Class.retire() methods are disabled.
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55 """
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56 self.dir, self.journaltag = storagelocator, journaltag
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57 self.classes = {}
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58 self.cache = {} # cache of nodes loaded or created
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59 self.dirtynodes = {} # keep track of the dirty nodes by class
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60 self.newnodes = {} # keep track of the new nodes by class
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61 self.transactions = []
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62
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63 def __repr__(self):
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64 return '<back_anydbm instance at %x>'%id(self)
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65
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66 #
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67 # Classes
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68 #
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69 def __getattr__(self, classname):
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70 """A convenient way of calling self.getclass(classname)."""
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71 if self.classes.has_key(classname):
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72 if DEBUG:
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73 print '__getattr__', (self, classname)
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74 return self.classes[classname]
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75 raise AttributeError, classname
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76
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77 def addclass(self, cl):
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78 if DEBUG:
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79 print 'addclass', (self, cl)
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80 cn = cl.classname
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81 if self.classes.has_key(cn):
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82 raise ValueError, cn
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83 self.classes[cn] = cl
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84
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85 def getclasses(self):
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86 """Return a list of the names of all existing classes."""
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87 if DEBUG:
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88 print 'getclasses', (self,)
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89 l = self.classes.keys()
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90 l.sort()
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91 return l
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92
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93 def getclass(self, classname):
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94 """Get the Class object representing a particular class.
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95
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96 If 'classname' is not a valid class name, a KeyError is raised.
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97 """
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98 if DEBUG:
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99 print 'getclass', (self, classname)
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100 return self.classes[classname]
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101
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102 #
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103 # Class DBs
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104 #
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105 def clear(self):
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106 '''Delete all database contents
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107 '''
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108 if DEBUG:
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109 print 'clear', (self,)
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110 for cn in self.classes.keys():
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111 for type in 'nodes', 'journals':
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112 path = os.path.join(self.dir, 'journals.%s'%cn)
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113 if os.path.exists(path):
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114 os.remove(path)
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115 elif os.path.exists(path+'.db'): # dbm appends .db
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116 os.remove(path+'.db')
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117
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118 def getclassdb(self, classname, mode='r'):
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119 ''' grab a connection to the class db that will be used for
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120 multiple actions
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121 '''
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122 if DEBUG:
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123 print 'getclassdb', (self, classname, mode)
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124 return self._opendb('nodes.%s'%classname, mode)
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125
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126 def _opendb(self, name, mode):
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127 '''Low-level database opener that gets around anydbm/dbm
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128 eccentricities.
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129 '''
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130 if DEBUG:
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131 print '_opendb', (self, name, mode)
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132 # determine which DB wrote the class file
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133 db_type = ''
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134 path = os.path.join(os.getcwd(), self.dir, name)
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135 if os.path.exists(path):
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136 db_type = whichdb.whichdb(path)
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diff changeset
137 if not db_type:
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diff changeset
138 raise hyperdb.DatabaseError, "Couldn't identify database type"
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diff changeset
139 elif os.path.exists(path+'.db'):
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diff changeset
140 # if the path ends in '.db', it's a dbm database, whether
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diff changeset
141 # anydbm says it's dbhash or not!
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diff changeset
142 db_type = 'dbm'
443
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diff changeset
143
a0c598702f17 I fixed the problems with anydbm using the dbm module at the backend.
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diff changeset
144 # new database? let anydbm pick the best dbm
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diff changeset
145 if not db_type:
452
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diff changeset
146 if DEBUG:
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diff changeset
147 print "_opendb anydbm.open(%r, 'n')"%path
71
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diff changeset
148 return anydbm.open(path, 'n')
46
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149
443
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diff changeset
150 # open the database with the correct module
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diff changeset
151 try:
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diff changeset
152 dbm = __import__(db_type)
444
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diff changeset
153 except ImportError:
443
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diff changeset
154 raise hyperdb.DatabaseError, \
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diff changeset
155 "Couldn't open database - the required module '%s'"\
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diff changeset
156 "is not available"%db_type
452
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diff changeset
157 if DEBUG:
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diff changeset
158 print "_opendb %r.open(%r, %r)"%(db_type, path, mode)
443
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diff changeset
159 return dbm.open(path, mode)
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diff changeset
160
48
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diff changeset
161 #
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diff changeset
162 # Nodes
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diff changeset
163 #
46
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164 def addnode(self, classname, nodeid, node):
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165 ''' add the specified node to its class's db
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166 '''
452
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diff changeset
167 if DEBUG:
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diff changeset
168 print 'addnode', (self, classname, nodeid, node)
430
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diff changeset
169 self.newnodes.setdefault(classname, {})[nodeid] = 1
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diff changeset
170 self.cache.setdefault(classname, {})[nodeid] = node
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diff changeset
171 self.savenode(classname, nodeid, node)
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diff changeset
172
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diff changeset
173 def setnode(self, classname, nodeid, node):
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diff changeset
174 ''' change the specified node
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diff changeset
175 '''
452
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diff changeset
176 if DEBUG:
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diff changeset
177 print 'setnode', (self, classname, nodeid, node)
430
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diff changeset
178 self.dirtynodes.setdefault(classname, {})[nodeid] = 1
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diff changeset
179 # can't set without having already loaded the node
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diff changeset
180 self.cache[classname][nodeid] = node
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diff changeset
181 self.savenode(classname, nodeid, node)
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diff changeset
182
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diff changeset
183 def savenode(self, classname, nodeid, node):
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diff changeset
184 ''' perform the saving of data specified by the set/addnode
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diff changeset
185 '''
452
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diff changeset
186 if DEBUG:
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diff changeset
187 print 'savenode', (self, classname, nodeid, node)
430
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diff changeset
188 self.transactions.append((self._doSaveNode, (classname, nodeid, node)))
46
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189
452
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diff changeset
190 def getnode(self, classname, nodeid, db=None):
460
9c895b44240a take a copy of the node dict...
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diff changeset
191 ''' get a node from the database
46
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192 '''
452
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diff changeset
193 if DEBUG:
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diff changeset
194 print 'getnode', (self, classname, nodeid, cldb)
430
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diff changeset
195 # try the cache
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diff changeset
196 cache = self.cache.setdefault(classname, {})
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diff changeset
197 if cache.has_key(nodeid):
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diff changeset
198 return cache[nodeid]
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diff changeset
199
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diff changeset
200 # get from the database and save in the cache
452
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diff changeset
201 if db is None:
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diff changeset
202 db = self.getclassdb(classname)
46
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diff changeset
203 if not db.has_key(nodeid):
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diff changeset
204 raise IndexError, nodeid
48
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
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diff changeset
205 res = marshal.loads(db[nodeid])
430
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diff changeset
206 cache[nodeid] = res
46
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diff changeset
207 return res
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diff changeset
208
452
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diff changeset
209 def hasnode(self, classname, nodeid, db=None):
460
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diff changeset
210 ''' determine if the database has a given node
46
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211 '''
452
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diff changeset
212 if DEBUG:
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diff changeset
213 print 'hasnode', (self, classname, nodeid, cldb)
430
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diff changeset
214 # try the cache
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diff changeset
215 cache = self.cache.setdefault(classname, {})
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diff changeset
216 if cache.has_key(nodeid):
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diff changeset
217 return 1
350685601f37 Database transactions.
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diff changeset
218
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diff changeset
219 # not in the cache - check the database
452
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diff changeset
220 if db is None:
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diff changeset
221 db = self.getclassdb(classname)
46
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diff changeset
222 res = db.has_key(nodeid)
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parents:
diff changeset
223 return res
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
224
452
7181efddce66 yuck, a gdbm instance tests false :(
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diff changeset
225 def countnodes(self, classname, db=None):
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diff changeset
226 if DEBUG:
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diff changeset
227 print 'countnodes', (self, classname, cldb)
430
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diff changeset
228 # include the new nodes not saved to the DB yet
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diff changeset
229 count = len(self.newnodes.get(classname, {}))
350685601f37 Database transactions.
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diff changeset
230
350685601f37 Database transactions.
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diff changeset
231 # and count those in the DB
452
7181efddce66 yuck, a gdbm instance tests false :(
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diff changeset
232 if db is None:
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diff changeset
233 db = self.getclassdb(classname)
430
350685601f37 Database transactions.
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parents: 394
diff changeset
234 count = count + len(db.keys())
350685601f37 Database transactions.
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parents: 394
diff changeset
235 return count
46
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
236
452
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diff changeset
237 def getnodeids(self, classname, db=None):
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diff changeset
238 if DEBUG:
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diff changeset
239 print 'getnodeids', (self, classname, db)
430
350685601f37 Database transactions.
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parents: 394
diff changeset
240 # start off with the new nodes
350685601f37 Database transactions.
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parents: 394
diff changeset
241 res = self.newnodes.get(classname, {}).keys()
350685601f37 Database transactions.
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diff changeset
242
452
7181efddce66 yuck, a gdbm instance tests false :(
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parents: 444
diff changeset
243 if db is None:
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parents: 444
diff changeset
244 db = self.getclassdb(classname)
430
350685601f37 Database transactions.
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parents: 394
diff changeset
245 res = res + db.keys()
46
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
246 return res
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parents:
diff changeset
247
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
248 #
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parents:
diff changeset
249 # Journal
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parents:
diff changeset
250 #
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parents:
diff changeset
251 def addjournal(self, classname, nodeid, action, params):
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parents:
diff changeset
252 ''' Journal the Action
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parents:
diff changeset
253 'action' may be:
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
254
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
255 'create' or 'set' -- 'params' is a dictionary of property values
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
256 'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
257 'retire' -- 'params' is None
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parents:
diff changeset
258 '''
452
7181efddce66 yuck, a gdbm instance tests false :(
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diff changeset
259 if DEBUG:
7181efddce66 yuck, a gdbm instance tests false :(
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diff changeset
260 print 'addjournal', (self, classname, nodeid, action, params)
430
350685601f37 Database transactions.
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parents: 394
diff changeset
261 self.transactions.append((self._doSaveJournal, (classname, nodeid,
350685601f37 Database transactions.
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parents: 394
diff changeset
262 action, params)))
46
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
263
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
264 def getjournal(self, classname, nodeid):
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parents:
diff changeset
265 ''' get the journal for id
3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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parents:
diff changeset
266 '''
452
7181efddce66 yuck, a gdbm instance tests false :(
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parents: 444
diff changeset
267 if DEBUG:
7181efddce66 yuck, a gdbm instance tests false :(
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parents: 444
diff changeset
268 print 'getjournal', (self, classname, nodeid)
48
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
269 # attempt to open the journal - in some rare cases, the journal may
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
270 # not exist
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
271 try:
444
3fa2268041a8 Cor blimey this anydbm/whichdb stuff is yecchy.
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parents: 443
diff changeset
272 db = self._opendb('journals.%s'%classname, 'r')
3fa2268041a8 Cor blimey this anydbm/whichdb stuff is yecchy.
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parents: 443
diff changeset
273 except anydbm.error, error:
3fa2268041a8 Cor blimey this anydbm/whichdb stuff is yecchy.
Richard Jones <richard@users.sourceforge.net>
parents: 443
diff changeset
274 if str(error) == "need 'c' or 'n' flag to open new db": return []
3fa2268041a8 Cor blimey this anydbm/whichdb stuff is yecchy.
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parents: 443
diff changeset
275 elif error.args[0] != 2: raise
48
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
276 return []
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
277 journal = marshal.loads(db[nodeid])
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
278 res = []
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
279 for entry in journal:
671203878652 Moved over to using marshal in the bsddb and anydbm backends.
Richard Jones <richard@users.sourceforge.net>
parents: 46
diff changeset
280 (nodeid, date_stamp, self.journaltag, action, params) = entry
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281 date_obj = date.Date(date_stamp)
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282 res.append((nodeid, date_obj, self.journaltag, action, params))
46
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283 return res
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284
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285
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286 #
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287 # Basic transaction support
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288 #
252
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289 def commit(self):
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290 ''' Commit the current transactions.
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291 '''
452
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292 if DEBUG:
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293 print 'commit', (self,)
252
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294 # lock the DB
430
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295 for method, args in self.transactions:
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296 # TODO: optimise this, duh!
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297 method(*args)
252
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298 # unlock the DB
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299
430
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300 # all transactions committed, back to normal
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301 self.cache = {}
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302 self.dirtynodes = {}
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303 self.newnodes = {}
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304 self.transactions = []
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305
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306 def _doSaveNode(self, classname, nodeid, node):
452
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307 if DEBUG:
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308 print '_doSaveNode', (self, classname, nodeid, node)
430
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309 db = self.getclassdb(classname, 'c')
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310 # now save the marshalled data
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311 db[nodeid] = marshal.dumps(node)
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312 db.close()
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313
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314 def _doSaveJournal(self, classname, nodeid, action, params):
452
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315 if DEBUG:
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316 print '_doSaveJournal', (self, classname, nodeid, action, params)
430
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317 entry = (nodeid, date.Date().get_tuple(), self.journaltag, action,
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318 params)
452
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319 db = self._opendb('journals.%s'%classname, 'c')
430
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320 if db.has_key(nodeid):
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321 s = db[nodeid]
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322 l = marshal.loads(db[nodeid])
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323 l.append(entry)
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324 else:
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325 l = [entry]
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326 db[nodeid] = marshal.dumps(l)
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327 db.close()
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328
46
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329 def rollback(self):
252
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330 ''' Reverse all actions from the current transaction.
46
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331 '''
452
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332 if DEBUG:
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333 print 'rollback', (self, )
430
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334 self.cache = {}
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335 self.dirtynodes = {}
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336 self.newnodes = {}
252
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337 self.transactions = []
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338
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339 #
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340 #$Log: not supported by cvs2svn $
460
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341 #Revision 1.17 2001/12/14 23:42:57 richard
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342 #yuck, a gdbm instance tests false :(
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343 #I've left the debugging code in - it should be removed one day if we're ever
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344 #_really_ anal about performace :)
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345 #
452
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346 #Revision 1.16 2001/12/12 03:23:14 richard
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347 #Cor blimey this anydbm/whichdb stuff is yecchy. Turns out that whichdb
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348 #incorrectly identifies a dbm file as a dbhash file on my system. This has
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349 #been submitted to the python bug tracker as issue #491888:
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350 #https://sourceforge.net/tracker/index.php?func=detail&aid=491888&group_id=5470&atid=105470
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351 #
444
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352 #Revision 1.15 2001/12/12 02:30:51 richard
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353 #I fixed the problems with people whose anydbm was using the dbm module at the
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354 #backend. It turns out the dbm module modifies the file name to append ".db"
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355 #and my check to determine if we're opening an existing or new db just
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356 #tested os.path.exists() on the filename. Well, no longer! We now perform a
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357 #much better check _and_ cope with the anydbm implementation module changing
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358 #too!
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359 #I also fixed the backends __init__ so only ImportError is squashed.
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360 #
443
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361 #Revision 1.14 2001/12/10 22:20:01 richard
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362 #Enabled transaction support in the bsddb backend. It uses the anydbm code
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363 #where possible, only replacing methods where the db is opened (it uses the
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364 #btree opener specifically.)
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365 #Also cleaned up some change note generation.
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366 #Made the backends package work with pydoc too.
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367 #
440
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368 #Revision 1.13 2001/12/02 05:06:16 richard
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369 #. We now use weakrefs in the Classes to keep the database reference, so
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370 # the close() method on the database is no longer needed.
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371 # I bumped the minimum python requirement up to 2.1 accordingly.
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372 #. #487480 ] roundup-server
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373 #. #487476 ] INSTALL.txt
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374 #
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375 #I also cleaned up the change message / post-edit stuff in the cgi client.
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376 #There's now a clearly marked "TODO: append the change note" where I believe
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377 #the change note should be added there. The "changes" list will obviously
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378 #have to be modified to be a dict of the changes, or somesuch.
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379 #
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diff changeset
380 #More testing needed.
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381 #
431
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382 #Revision 1.12 2001/12/01 07:17:50 richard
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383 #. We now have basic transaction support! Information is only written to
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384 # the database when the commit() method is called. Only the anydbm
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385 # backend is modified in this way - neither of the bsddb backends have been.
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386 # The mail, admin and cgi interfaces all use commit (except the admin tool
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387 # doesn't have a commit command, so interactive users can't commit...)
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388 #. Fixed login/registration forwarding the user to the right page (or not,
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diff changeset
389 # on a failure)
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390 #
430
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391 #Revision 1.11 2001/11/21 02:34:18 richard
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392 #Added a target version field to the extended issue schema
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393 #
394
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394 #Revision 1.10 2001/10/09 23:58:10 richard
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395 #Moved the data stringification up into the hyperdb.Class class' get, set
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396 #and create methods. This means that the data is also stringified for the
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397 #journal call, and removes duplication of code from the backends. The
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398 #backend code now only sees strings.
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399 #
275
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400 #Revision 1.9 2001/10/09 07:25:59 richard
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401 #Added the Password property type. See "pydoc roundup.password" for
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402 #implementation details. Have updated some of the documentation too.
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403 #
270
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404 #Revision 1.8 2001/09/29 13:27:00 richard
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405 #CGI interfaces now spit up a top-level index of all the instances they can
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406 #serve.
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407 #
252
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408 #Revision 1.7 2001/08/12 06:32:36 richard
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409 #using isinstance(blah, Foo) now instead of isFooType
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410 #
224
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411 #Revision 1.6 2001/08/07 00:24:42 richard
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412 #stupid typo
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413 #
214
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414 #Revision 1.5 2001/08/07 00:15:51 richard
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415 #Added the copyright/license notice to (nearly) all files at request of
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416 #Bizar Software.
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417 #
213
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418 #Revision 1.4 2001/07/30 01:41:36 richard
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419 #Makes schema changes mucho easier.
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420 #
149
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421 #Revision 1.3 2001/07/25 01:23:07 richard
fbc77ecf133b Makes schema changes mucho easier.
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422 #Added the Roundup spec to the new documentation directory.
fbc77ecf133b Makes schema changes mucho easier.
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423 #
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5147b4c51fd5 Added the Roundup spec to the new documentation directory.
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424 #Revision 1.2 2001/07/23 08:20:44 richard
5147b4c51fd5 Added the Roundup spec to the new documentation directory.
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425 #Moved over to using marshal in the bsddb and anydbm backends.
5147b4c51fd5 Added the Roundup spec to the new documentation directory.
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426 #roundup-admin now has a "freshen" command that'll load/save all nodes (not
5147b4c51fd5 Added the Roundup spec to the new documentation directory.
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427 # retired - mod hyperdb.Class.list() so it lists retired nodes)
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3c5920433866 *sigh* some databases have _foo.so as their underlying implementation.
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428 #
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5147b4c51fd5 Added the Roundup spec to the new documentation directory.
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429 #
Roundup Issue Tracker: http://roundup-tracker.org/