Mercurial > cpython-lru_cache-weakref

annotate Mac/Lib/dbmac.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 246d5422124f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4574ed657cc9 shelve.py: database of persistent objects, on top of pickle.py and anydbm.py
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1 """A slow but simple dbm clone for the Mac.
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2
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3 For database spam, spam.dir contains the index (a text file),
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4 spam.bak *may* contain a backup of the index (also a text file),
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5 while spam.dat contains the data (a binary file).
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6
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7 XXX TO DO:
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8
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9 - reclaim free space (currently, space once occupied by deleted or expanded
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10 items is never reused)
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11
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12 - support concurrent access (currently, if two processes take turns making
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13 updates, they can mess up the index)
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14
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15 - support efficient access to large databases (currently, the whole index
4574ed657cc9 shelve.py: database of persistent objects, on top of pickle.py and anydbm.py
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16 is read when the database is opened, and some updates rewrite the whole index)
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246d5422124f add (dummy) mode arg to open()
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17
246d5422124f add (dummy) mode arg to open()
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18 - support opening for read-only (flag = 'm')
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19
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20 """
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21
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22 _os = __import__('os')
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23 import __builtin__
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24
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25 _open = __builtin__.open
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26
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27 _BLOCKSIZE = 512
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28
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29 class _Database:
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30
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31 def __init__(self, file):
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32 self._dirfile = file + '.dir'
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33 self._datfile = file + '.dat'
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34 self._bakfile = file + '.bak'
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35 # Mod by Jack: create data file if needed
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36 try:
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37 f = _open(self._datfile, 'r')
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38 except IOError:
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39 f = _open(self._datfile, 'w')
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40 f.close()
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41 self._update()
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42
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43 def _update(self):
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44 self._index = {}
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45 try:
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46 f = _open(self._dirfile)
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47 except IOError:
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48 pass
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49 else:
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50 while 1:
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51 line = f.readline()
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52 if not line: break
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53 key, (pos, siz) = eval(line)
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54 self._index[key] = (pos, siz)
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55 f.close()
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56
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57 def _commit(self):
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58 try: _os.unlink(self._bakfile)
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59 except _os.error: pass
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60 try: _os.rename(self._dirfile, self._bakfile)
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61 except _os.error: pass
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62 f = _open(self._dirfile, 'w')
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63 for key, (pos, siz) in self._index.items():
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64 f.write("%s, (%s, %s)\n" % (`key`, `pos`, `siz`))
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65 f.close()
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66
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67 def __getitem__(self, key):
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68 pos, siz = self._index[key] # may raise KeyError
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69 f = _open(self._datfile, 'rb')
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70 f.seek(pos)
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71 dat = f.read(siz)
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72 f.close()
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73 return dat
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74
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75 def _addval(self, val):
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76 f = _open(self._datfile, 'rb+')
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77 f.seek(0, 2)
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78 pos = f.tell()
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79 ## Does not work under MW compiler
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80 ## pos = ((pos + _BLOCKSIZE - 1) / _BLOCKSIZE) * _BLOCKSIZE
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81 ## f.seek(pos)
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82 npos = ((pos + _BLOCKSIZE - 1) / _BLOCKSIZE) * _BLOCKSIZE
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83 f.write('\0'*(npos-pos))
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84 pos = npos
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85
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86 f.write(val)
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87 f.close()
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88 return (pos, len(val))
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89
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90 def _setval(self, pos, val):
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91 f = _open(self._datfile, 'rb+')
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92 f.seek(pos)
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93 f.write(val)
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94 f.close()
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95 return pos, (val)
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96
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97 def _addkey(self, key, (pos, siz)):
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98 self._index[key] = (pos, siz)
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99 f = _open(self._dirfile, 'a')
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100 f.write("%s, (%s, %s)\n" % (`key`, `pos`, `siz`))
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101 f.close()
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102
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103 def __setitem__(self, key, val):
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104 if not type(key) == type('') == type(val):
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105 raise TypeError, "dbmac keys and values must be strings"
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106 if not self._index.has_key(key):
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107 (pos, siz) = self._addval(val)
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108 self._addkey(key, (pos, siz))
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109 else:
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110 pos, siz = self._index[key]
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111 oldblocks = (siz + _BLOCKSIZE - 1) / _BLOCKSIZE
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112 newblocks = (len(val) + _BLOCKSIZE - 1) / _BLOCKSIZE
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113 if newblocks <= oldblocks:
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114 pos, siz = self._setval(pos, val)
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115 self._index[key] = pos, siz
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116 else:
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117 pos, siz = self._addval(val)
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118 self._index[key] = pos, siz
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119 self._addkey(key, (pos, siz))
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120
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121 def __delitem__(self, key):
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122 del self._index[key]
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123 self._commit()
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124
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125 def keys(self):
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126 return self._index.keys()
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127
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128 def has_key(self, key):
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129 return self._index.has_key(key)
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130
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131 def __len__(self):
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132 return len(self._index)
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133
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134 def close(self):
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135 self._index = self._datfile = self._dirfile = self._bakfile = None
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136
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137
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138 def open(file, flag = None, mode = None):
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139 # flag, mode arguments are currently ignored
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140 return _Database(file)