Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/plugins/stores/auditable.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 """
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2
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3 This wrapper intercepts calls through the store interface and implements
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4 thread-safe logging of destructive operations (adds / removes) in reverse.
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5 This is persisted on the store instance and the reverse operations are
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6 executed In order to return the store to the state it was when the transaction
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7 began Since the reverse operations are persisted on the store, the store
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8 itself acts as a transaction.
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9
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10 Calls to commit or rollback, flush the list of reverse operations This
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11 provides thread-safe atomicity and isolation (assuming concurrent operations
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12 occur with different store instances), but no durability (transactions are
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13 persisted in memory and wont be available to reverse operations after the
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14 system fails): A and I out of ACID.
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15
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16 """
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17
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18 from rdflib.store import Store
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19 from rdflib import Graph, ConjunctiveGraph
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20 import threading
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21
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22 destructiveOpLocks = {
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23 'add': None,
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24 'remove': None,
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25 }
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26
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27
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28 class AuditableStore(Store):
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29 def __init__(self, store):
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30 self.store = store
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31 self.context_aware = store.context_aware
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32 # NOTE: this store can't be formula_aware as it doesn't have enough
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33 # info to reverse the removal of a quoted statement
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34 self.formula_aware = False # store.formula_aware
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35 self.transaction_aware = True # This is only half true
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36 self.reverseOps = []
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37 self.rollbackLock = threading.RLock()
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38
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39 def open(self, configuration, create=True):
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40 return self.store.open(configuration, create)
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41
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42 def close(self, commit_pending_transaction=False):
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43 self.store.close()
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44
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45 def destroy(self, configuration):
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46 self.store.destroy(configuration)
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47
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48 def query(self, *args, **kw):
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49 return self.store.query(*args, **kw)
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50
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51 def add(self, triple, context, quoted=False):
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52 (s, p, o) = triple
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53 lock = destructiveOpLocks['add']
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54 lock = lock if lock else threading.RLock()
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55 with lock:
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56 context = context.__class__(self.store, context.identifier) if context is not None else None
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57 ctxId = context.identifier if context is not None else None
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58 if list(self.store.triples(triple, context)):
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59 return # triple already in store, do nothing
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60 self.reverseOps.append((s, p, o, ctxId, 'remove'))
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61 try:
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62 self.reverseOps.remove((s, p, o, ctxId, 'add'))
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63 except ValueError:
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64 pass
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65 self.store.add((s, p, o), context, quoted)
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66
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67 def remove(self, xxx_todo_changeme, context=None):
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68 (subject, predicate, object_) = xxx_todo_changeme
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69 lock = destructiveOpLocks['remove']
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70 lock = lock if lock else threading.RLock()
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71 with lock:
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72 # Need to determine which quads will be removed if any term is a
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73 # wildcard
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74 context = context.__class__(self.store, context.identifier) if context is not None else None
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75 ctxId = context.identifier if context is not None else None
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76 if None in [subject, predicate, object_, context]:
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77 if ctxId:
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78 for s, p, o in context.triples((subject, predicate, object_)):
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79 try:
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80 self.reverseOps.remove((s, p, o, ctxId, 'remove'))
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81 except ValueError:
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82 self.reverseOps.append((s, p, o, ctxId, 'add'))
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83 else:
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84 for s, p, o, ctx in ConjunctiveGraph(self.store).quads((subject, predicate, object_)):
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85 try:
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86 self.reverseOps.remove((s, p, o, ctx.identifier, 'remove'))
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87 except ValueError:
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88 self.reverseOps.append((s, p, o, ctx.identifier, 'add'))
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89 else:
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90 if not list(self.triples((subject, predicate, object_), context)):
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91 return # triple not present in store, do nothing
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92 try:
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93 self.reverseOps.remove((subject, predicate, object_, ctxId, 'remove'))
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94 except ValueError:
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95 self.reverseOps.append((subject, predicate, object_, ctxId, 'add'))
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96 self.store.remove((subject, predicate, object_), context)
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97
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98 def triples(self, triple, context=None):
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99 (su, pr, ob) = triple
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100 context = context.__class__(self.store, context.identifier) if context is not None else None
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101 for (s, p, o), cg in self.store.triples((su, pr, ob), context):
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102 yield (s, p, o), cg
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103
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104 def __len__(self, context=None):
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105 context = context.__class__(self.store, context.identifier) if context is not None else None
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106 return self.store.__len__(context)
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107
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108 def contexts(self, triple=None):
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109 for ctx in self.store.contexts(triple):
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110 yield ctx
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111
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112 def bind(self, prefix, namespace):
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113 self.store.bind(prefix, namespace)
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114
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115 def prefix(self, namespace):
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116 return self.store.prefix(namespace)
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117
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118 def namespace(self, prefix):
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119 return self.store.namespace(prefix)
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120
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121 def namespaces(self):
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122 return self.store.namespaces()
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123
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124 def commit(self):
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125 self.reverseOps = []
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126
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127 def rollback(self):
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128 # Aquire Rollback lock and apply reverse operations in the forward
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129 # order
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130 with self.rollbackLock:
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131 for subject, predicate, obj, context, op in self.reverseOps:
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132 if op == 'add':
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133 self.store.add(
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134 (subject, predicate, obj), Graph(self.store, context))
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135 else:
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136 self.store.remove(
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137 (subject, predicate, obj), Graph(self.store, context))
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138
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139 self.reverseOps = []