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annotate hyperdb_bsddb.py @ 19:a5eb90ae8903

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Fixed a bug in the filter wrong variable names in the error message. Recognised that the filter has an outstanding bug. Hrm. we need a bug tracker for this project :)
author Richard Jones <richard@users.sourceforge.net>
date Fri, 20 Jul 2001 08:20:24 +0000
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children
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1 #$Id: hyperdb_bsddb.py,v 1.1 2001-07-20 07:35:55 richard Exp $
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2
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3 import bsddb, os, cPickle
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4 import date
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5
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6 #
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7 # Now the database
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8 #
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9 class Database:
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10 """A database for storing records containing flexible data types."""
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11
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12 def __init__(self, storagelocator, journaltag=None):
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13 """Open a hyperdatabase given a specifier to some storage.
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14
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15 The meaning of 'storagelocator' depends on the particular
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16 implementation of the hyperdatabase. It could be a file name,
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17 a directory path, a socket descriptor for a connection to a
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18 database over the network, etc.
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19
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20 The 'journaltag' is a token that will be attached to the journal
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21 entries for any edits done on the database. If 'journaltag' is
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22 None, the database is opened in read-only mode: the Class.create(),
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23 Class.set(), and Class.retire() methods are disabled.
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24 """
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25 self.dir, self.journaltag = storagelocator, journaltag
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26 self.classes = {}
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27
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28 #
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29 # Classes
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30 #
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31 def __getattr__(self, classname):
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32 """A convenient way of calling self.getclass(classname)."""
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33 return self.classes[classname]
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34
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35 def addclass(self, cl):
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36 cn = cl.classname
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37 if self.classes.has_key(cn):
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38 raise ValueError, cn
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39 self.classes[cn] = cl
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40
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41 def getclasses(self):
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42 """Return a list of the names of all existing classes."""
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43 l = self.classes.keys()
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44 l.sort()
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45 return l
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46
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47 def getclass(self, classname):
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48 """Get the Class object representing a particular class.
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49
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50 If 'classname' is not a valid class name, a KeyError is raised.
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51 """
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52 return self.classes[classname]
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53
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54 #
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55 # Class DBs
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56 #
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57 def clear(self):
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58 for cn in self.classes.keys():
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59 db = os.path.join(self.dir, 'nodes.%s'%cn)
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60 bsddb.btopen(db, 'n')
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61 db = os.path.join(self.dir, 'journals.%s'%cn)
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62 bsddb.btopen(db, 'n')
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63
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64 def getclassdb(self, classname, mode='r'):
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65 ''' grab a connection to the class db that will be used for
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66 multiple actions
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67 '''
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68 path = os.path.join(os.getcwd(), self.dir, 'nodes.%s'%classname)
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69 return bsddb.btopen(path, mode)
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70
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71 def addnode(self, classname, nodeid, node):
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72 ''' add the specified node to its class's db
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73 '''
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74 db = self.getclassdb(classname, 'c')
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75 db[nodeid] = cPickle.dumps(node, 1)
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76 db.close()
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77 setnode = addnode
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78
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79 def getnode(self, classname, nodeid, cldb=None):
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80 ''' add the specified node to its class's db
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81 '''
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82 db = cldb or self.getclassdb(classname)
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83 if not db.has_key(nodeid):
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84 raise IndexError, nodeid
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85 res = cPickle.loads(db[nodeid])
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86 if not cldb: db.close()
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87 return res
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88
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89 def hasnode(self, classname, nodeid, cldb=None):
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90 ''' add the specified node to its class's db
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91 '''
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92 db = cldb or self.getclassdb(classname)
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93 res = db.has_key(nodeid)
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94 if not cldb: db.close()
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95 return res
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96
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97 def countnodes(self, classname, cldb=None):
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98 db = cldb or self.getclassdb(classname)
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99 return len(db.keys())
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100 if not cldb: db.close()
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101 return res
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102
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103 def getnodeids(self, classname, cldb=None):
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104 db = cldb or self.getclassdb(classname)
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105 res = db.keys()
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106 if not cldb: db.close()
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107 return res
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108
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109 #
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110 # Journal
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111 #
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112 def addjournal(self, classname, nodeid, action, params):
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113 ''' Journal the Action
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114 'action' may be:
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115
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116 'create' or 'set' -- 'params' is a dictionary of property values
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117 'link' or 'unlink' -- 'params' is (classname, nodeid, propname)
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118 'retire' -- 'params' is None
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119 '''
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120 entry = (nodeid, date.Date(), self.journaltag, action, params)
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121 db = bsddb.btopen(os.path.join(self.dir, 'journals.%s'%classname), 'c')
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122 if db.has_key(nodeid):
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123 s = db[nodeid]
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124 l = cPickle.loads(db[nodeid])
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125 l.append(entry)
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126 else:
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127 l = [entry]
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128 db[nodeid] = cPickle.dumps(l)
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129 db.close()
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130
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131 def getjournal(self, classname, nodeid):
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132 ''' get the journal for id
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133 '''
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134 db = bsddb.btopen(os.path.join(self.dir, 'journals.%s'%classname), 'r')
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135 res = cPickle.loads(db[nodeid])
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136 db.close()
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137 return res
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138
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139 def close(self):
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140 ''' Close the Database - we must release the circular refs so that
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141 we can be del'ed and the underlying bsddb connections closed
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142 cleanly.
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143 '''
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144 self.classes = None
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145
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146
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147 #
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148 # Basic transaction support
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149 #
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150 # TODO: well, write these methods (and then use them in other code)
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151 def register_action(self):
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152 ''' Register an action to the transaction undo log
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153 '''
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154
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155 def commit(self):
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156 ''' Commit the current transaction, start a new one
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157 '''
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158
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159 def rollback(self):
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160 ''' Reverse all actions from the current transaction
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161 '''
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162
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163 #
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164 #$Log: not supported by cvs2svn $
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165
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