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annotate roundup/mlink_expr.py @ 6747:d32d43e4a5ba

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wsgi can cache tracker instance enabled by feature flag. Patch by Marcus Priesch caches a loaded tracker instance and reuse it for future client sessions. It is enabled by a feature flag in wsgi.py since it arrived during the 2.2.0 beta period. The provided wsgi.py is modified to enable it. Testing is run with flag enabled and disabled. Ralf Schlatterbeck and Marcus tested it on one of their larger more complex trackers and it sped up the response time to a client request by a factor of 3 (270ms down to about 80-85ms).
author John Rouillard <rouilj@ieee.org>
date Sat, 02 Jul 2022 14:04:00 -0400
parents a0c0ee3ed8b1
children 7b090bb35c25
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1 #
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2 # Copyright: 2010 Intevation GmbH.
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3 # 2021 Ralf Schlatterbeck, rsc@runtux.com.
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4 #
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5
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6 # This module is Free Software under the Roundup licensing,
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7 # see the COPYING.txt file coming with Roundup.
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8 #
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9
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10 class Binary:
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11
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12 def __init__(self, x, y):
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13 self.x = x
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14 self.y = y
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15
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16 def visit(self, visitor):
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17 self.x.visit(visitor)
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18 self.y.visit(visitor)
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19
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20 class Unary:
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21
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22 def __init__(self, x):
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23 self.x = x
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24
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25 def generate(self, atom):
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26 return atom(self)
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27
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28 def visit(self, visitor):
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29 self.x.visit(visitor)
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30
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31 class Equals(Unary):
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32
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33 def evaluate(self, v):
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34 return self.x in v
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35
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36 def visit(self, visitor):
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37 visitor(self)
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38
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39 class Empty(Unary):
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40
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41 def evaluate(self, v):
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42 return not v
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43
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44 def visit(self, visitor):
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45 visitor(self)
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46
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47 class Not(Unary):
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48
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49 def evaluate(self, v):
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50 return not self.x.evaluate(v)
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51
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52 def generate(self, atom):
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53 return "NOT(%s)" % self.x.generate(atom)
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54
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55 class Or(Binary):
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56
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57 def evaluate(self, v):
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58 return self.x.evaluate(v) or self.y.evaluate(v)
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59
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60 def generate(self, atom):
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61 return "(%s)OR(%s)" % (
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62 self.x.generate(atom),
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63 self.y.generate(atom))
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64
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65 class And(Binary):
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66
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67 def evaluate(self, v):
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68 return self.x.evaluate(v) and self.y.evaluate(v)
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69
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70 def generate(self, atom):
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71 return "(%s)AND(%s)" % (
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72 self.x.generate(atom),
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73 self.y.generate(atom))
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74
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75 def compile_expression(opcodes):
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76
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77 stack = []
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78 push, pop = stack.append, stack.pop
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79 for opcode in opcodes:
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80 if opcode == -1: push(Empty(opcode))
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81 elif opcode == -2: push(Not(pop()))
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82 elif opcode == -3: push(And(pop(), pop()))
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83 elif opcode == -4: push(Or(pop(), pop()))
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84 else: push(Equals(opcode))
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85
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86 return pop()
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87
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88 class Expression:
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89
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90 def __init__(self, v, is_link=False):
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91 try:
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92 opcodes = [int(x) for x in v]
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93 if min(opcodes) >= -1:
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94 raise ValueError()
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95
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96 compiled = compile_expression(opcodes)
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97 if is_link:
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98 self.evaluate = lambda x: compiled.evaluate(
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99 x and [int(x)] or [])
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100 else:
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101 self.evaluate = lambda x: compiled.evaluate([int(y) for y in x])
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102 except:
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103 if is_link:
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104 v = [None if x == '-1' else x for x in v]
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105 self.evaluate = lambda x: x in v
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106 elif '-1' in v:
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107 v = [x for x in v if int(x) > 0]
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108 self.evaluate = lambda x: bool(set(x) & set(v)) or not x
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109 else:
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110 self.evaluate = lambda x: bool(set(x) & set(v))
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