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annotate orpg/tools/pubsub.py @ 179:5609ac142298 alpha

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Traipse Alpha 'OpenRPG' {100114-03} Traipse is a distribution of OpenRPG that is designed to be easy to setup and go. Traipse also makes it easy for developers to work on code without fear of sacrifice. 'Ornery-Orc' continues the trend of 'Grumpy' and adds fixes to the code. 'Ornery-Orc's main goal is to offer more advanced features and enhance the productivity of the user. Update Summary (Keeping up with Beta) New Features: Added Bookmarks Added 'boot' command to remote admin Added confirmation window for sent nodes Minor changes to allow for portability to an OpenSUSE linux OS Miniatures Layer pop up box allows users to turn off Mini labels, from FlexiRPG Zoom Mouse plugin added Images added to Plugin UI Switching to Element Tree Map efficiency, from FlexiRPG Added Status Bar to Update Manager New TrueDebug Class in orpg_log (See documentation for usage) Portable Mercurial Tip of the Day added, from Core and community New Reference Syntax added for custom PC sheets New Child Reference for gametree New Parent Reference for gametree New Gametree Recursion method, mapping, context sensitivity, and effeciency.. New Features node with bonus nodes and Node Referencing help added Dieroller structure from Core New DieRoller portability for odd Dice Added 7th Sea die roller; ie [7k3] = [7d10.takeHighest(3).open(10)] New 'Mythos' System die roller added Added new vs. die roller method for WoD; ie [3v3] = [3d10.vs(3)]. Included for Mythos roller also New Warhammer FRPG Die Roller (Special thanks to Puu-san for the support) New EZ_Tree Reference system. Push a button, Traipse the tree, get a reference (Beta!) Fixes: Fix to Text based Server Fix to Remote Admin Commands Fix to Pretty Print, from Core Fix to Splitter Nodes not being created Fix to massive amounts of images loading, from Core Fix to Map from gametree not showing to all clients Fix to gametree about menus Fix to Password Manager check on startup Fix to PC Sheets from tool nodes. They now use the tabber_panel Fix to Whiteboard ID to prevent random line or text deleting. Fixes to Server, Remote Server, and Server GUI Fix to Update Manager; cleaner clode for saved repositories Fixes made to Settings Panel and now reactive settings when Ok is pressed Fixes to Alternity roller's attack roll. Uses a simple Tuple instead of a Splice Fix to Use panel of Forms and Tabbers. Now longer enters design mode Fix made Image Fetching. New fetching image and new failed image Modified ID's to prevent non updated clients from ruining the fix. default_manifest.xml renamed to default_upmana.xml
author sirebral
date Thu, 14 Jan 2010 21:22:21 -0600
parents 4385a7d0efd1
children dcae32e219f1
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0
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1
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2 #---------------------------------------------------------------------------
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3 """
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4 This module provides a publish-subscribe component that allows
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5 listeners to subcribe to messages of a given topic. Contrary to the
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6 original wxPython.lib.pubsub module (which it is based on), it uses
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7 weak referencing to the subscribers so the lifetime of subscribers
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8 is not affected by Publisher. Also, callable objects can be used in
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9 addition to functions and bound methods. See Publisher class docs for
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10 more details.
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11
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12 Thanks to Robb Shecter and Robin Dunn for having provided
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13 the basis for this module (which now shares most of the concepts but
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14 very little design or implementation with the original
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15 wxPython.lib.pubsub).
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16
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17 The publisher is a singleton instance of the PublisherClass class. You
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18 access the instance via the Publisher object available from the module::
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19
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20 from wx.lib.pubsub import Publisher
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21 Publisher().subscribe(...)
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22 Publisher().sendMessage(...)
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23 ...
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24
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25 :Author: Oliver Schoenborn
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26 :Since: Apr 2004
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27 :Version: $Id: pubsub.py,v 1.8 2006/06/11 00:12:59 RD Exp $
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28 :Copyright: \(c) 2004 Oliver Schoenborn
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29 :License: wxWidgets
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30 """
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31
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32 _implNotes = """
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33 Implementation notes
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34 --------------------
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35
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36 In class Publisher, I represent the topics-listener set as a tree
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37 where each node is a topic, and contains a list of listeners of that
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38 topic, and a dictionary of subtopics of that topic. When the Publisher
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39 is told to send a message for a given topic, it traverses the tree
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40 down to the topic for which a message is being generated, all
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41 listeners on the way get sent the message.
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42
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43 Publisher currently uses a weak listener topic tree to store the
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44 topics for each listener, and if a listener dies before being
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45 unsubscribed, the tree is notified, and the tree eliminates the
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46 listener from itself.
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47
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48 Ideally, _TopicTreeNode would be a generic _TreeNode with named
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49 subnodes, and _TopicTreeRoot would be a generic _Tree with named
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50 nodes, and Publisher would store listeners in each node and a topic
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51 tuple would be converted to a path in the tree. This would lead to a
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52 much cleaner separation of concerns. But time is over, time to move on.
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53 """
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54 #---------------------------------------------------------------------------
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55
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56 # for function and method parameter counting:
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57 from types import InstanceType
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58 from inspect import getargspec, ismethod, isfunction
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59 # for weakly bound methods:
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60 from new import instancemethod as InstanceMethod
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61 from weakref import ref as WeakRef
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62
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63 # -----------------------------------------------------------------------------
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64
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65 def _isbound(method):
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66 """Return true if method is a bound method, false otherwise"""
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67 assert ismethod(method)
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68 return method.im_self is not None
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69
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70
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71 def _paramMinCountFunc(function):
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72 """Given a function, return pair (min,d) where min is minimum # of
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73 args required, and d is number of default arguments."""
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74 assert isfunction(function)
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75 (args, va, kwa, dflt) = getargspec(function)
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76 lenDef = len(dflt or ())
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77 lenArgs = len(args or ())
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78 lenVA = int(va is not None)
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79 return (lenArgs - lenDef + lenVA, lenDef)
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80
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81
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82 def _paramMinCount(callableObject):
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83 """
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84 Given a callable object (function, method or callable instance),
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85 return pair (min,d) where min is minimum # of args required, and d
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86 is number of default arguments. The 'self' parameter, in the case
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87 of methods, is not counted.
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88 """
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89 if type(callableObject) is InstanceType:
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90 min, d = _paramMinCountFunc(callableObject.__call__.im_func)
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91 return min-1, d
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92 elif ismethod(callableObject):
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93 min, d = _paramMinCountFunc(callableObject.im_func)
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94 return min-1, d
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95 elif isfunction(callableObject):
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96 return _paramMinCountFunc(callableObject)
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97 else:
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98 raise 'Cannot determine type of callable: '+repr(callableObject)
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99
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100
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101 def _tupleize(items):
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102 """Convert items to tuple if not already one,
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103 so items must be a list, tuple or non-sequence"""
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104 if isinstance(items, list):
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105 raise TypeError, 'Not allowed to tuple-ize a list'
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106 elif isinstance(items, (str, unicode)) and items.find('.') != -1:
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107 items = tuple(items.split('.'))
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108 elif not isinstance(items, tuple):
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109 items = (items,)
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110 return items
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111
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112
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113 def _getCallableName(callable):
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114 """Get name for a callable, ie function, bound
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115 method or callable instance"""
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116 if ismethod(callable):
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117 return '%s.%s ' % (callable.im_self, callable.im_func.func_name)
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118 elif isfunction(callable):
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119 return '%s ' % callable.__name__
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120 else:
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121 return '%s ' % callable
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122
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123
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124 def _removeItem(item, fromList):
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125 """Attempt to remove item from fromList, return true
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126 if successful, false otherwise."""
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127 try:
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128 fromList.remove(item)
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129 return True
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130 except ValueError:
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131 return False
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132
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133
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134 # -----------------------------------------------------------------------------
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135
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136 class _WeakMethod:
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137 """Represent a weak bound method, i.e. a method doesn't keep alive the
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138 object that it is bound to. It uses WeakRef which, used on its own,
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139 produces weak methods that are dead on creation, not very useful.
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140 Typically, you will use the getRef() function instead of using
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141 this class directly. """
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142
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143 def __init__(self, method, notifyDead = None):
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144 """The method must be bound. notifyDead will be called when
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145 object that method is bound to dies. """
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146 assert ismethod(method)
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147 if method.im_self is None:
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148 raise ValueError, "We need a bound method!"
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149 if notifyDead is None:
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150 self.objRef = WeakRef(method.im_self)
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151 else:
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152 self.objRef = WeakRef(method.im_self, notifyDead)
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153 self.fun = method.im_func
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154 self.cls = method.im_class
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155
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156 def __call__(self):
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157 """Returns a new.instancemethod if object for method still alive.
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158 Otherwise return None. Note that instancemethod causes a
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159 strong reference to object to be created, so shouldn't save
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160 the return value of this call. Note also that this __call__
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161 is required only for compatibility with WeakRef.ref(), otherwise
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162 there would be more efficient ways of providing this functionality."""
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163 if self.objRef() is None:
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164 return None
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165 else:
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166 return InstanceMethod(self.fun, self.objRef(), self.cls)
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167
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168 def __eq__(self, method2):
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169 """Two WeakMethod objects compare equal if they refer to the same method
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170 of the same instance. Thanks to Josiah Carlson for patch and clarifications
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171 on how dict uses eq/cmp and hashing. """
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172 if not isinstance(method2, _WeakMethod):
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173 return False
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174 return self.fun is method2.fun \
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175 and self.objRef() is method2.objRef() \
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176 and self.objRef() is not None
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177
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178 def __hash__(self):
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179 """Hash is an optimization for dict searches, it need not
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180 return different numbers for every different object. Some objects
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181 are not hashable (eg objects of classes derived from dict) so no
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182 hash(objRef()) in there, and hash(self.cls) would only be useful
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183 in the rare case where instance method was rebound. """
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184 return hash(self.fun)
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185
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186 def __repr__(self):
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187 dead = ''
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188 if self.objRef() is None:
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189 dead = '; DEAD'
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190 obj = '<%s at %s%s>' % (self.__class__, id(self), dead)
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191 return obj
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192
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193 def refs(self, weakRef):
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194 """Return true if we are storing same object referred to by weakRef."""
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195 return self.objRef == weakRef
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196
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197
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198 def _getWeakRef(obj, notifyDead=None):
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199 """Get a weak reference to obj. If obj is a bound method, a _WeakMethod
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200 object, that behaves like a WeakRef, is returned, if it is
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201 anything else a WeakRef is returned. If obj is an unbound method,
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202 a ValueError will be raised."""
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203 if ismethod(obj):
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204 createRef = _WeakMethod
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205 else:
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206 createRef = WeakRef
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207
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208 if notifyDead is None:
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209 return createRef(obj)
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210 else:
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211 return createRef(obj, notifyDead)
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212
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213
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214 # -----------------------------------------------------------------------------
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215
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216 def getStrAllTopics():
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217 """Function to call if, for whatever reason, you need to know
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218 explicitely what is the string to use to indicate 'all topics'."""
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219 return ''
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220
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221
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222 # alias, easier to see where used
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223 ALL_TOPICS = getStrAllTopics()
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224
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225 # -----------------------------------------------------------------------------
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226
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227
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228 class _NodeCallback:
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229 """Encapsulate a weak reference to a method of a TopicTreeNode
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230 in such a way that the method can be called, if the node is
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231 still alive, but the callback does not *keep* the node alive.
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232 Also, define two methods, preNotify() and noNotify(), which can
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233 be redefined to something else, very useful for testing.
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234 """
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235
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236 def __init__(self, obj):
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237 self.objRef = _getWeakRef(obj)
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238
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239 def __call__(self, weakCB):
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240 notify = self.objRef()
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241 if notify is not None:
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242 self.preNotify(weakCB)
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243 notify(weakCB)
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244 else:
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245 self.noNotify()
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246
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247 def preNotify(self, dead):
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248 """'Gets called just before our callback (self.objRef) is called"""
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249 pass
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250
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251 def noNotify(self):
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252 """Gets called if the TopicTreeNode for this callback is dead"""
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253 pass
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254
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255
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256 class _TopicTreeNode:
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257 """A node in the topic tree. This contains a list of callables
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258 that are interested in the topic that this node is associated
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259 with, and contains a dictionary of subtopics, whose associated
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260 values are other _TopicTreeNodes. The topic of a node is not stored
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261 in the node, so that the tree can be implemented as a dictionary
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262 rather than a list, for ease of use (and, likely, performance).
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263
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264 Note that it uses _NodeCallback to encapsulate a callback for
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265 when a registered listener dies, possible thanks to WeakRef.
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266 Whenever this callback is called, the onDeadListener() function,
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267 passed in at construction time, is called (unless it is None).
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268 """
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269
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270 def __init__(self, topicPath, onDeadListenerWeakCB):
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271 self.__subtopics = {}
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272 self.__callables = []
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273 self.__topicPath = topicPath
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274 self.__onDeadListenerWeakCB = onDeadListenerWeakCB
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275
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276 def getPathname(self):
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277 """The complete node path to us, ie., the topic tuple that would lead to us"""
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278 return self.__topicPath
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279
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280 def createSubtopic(self, subtopic, topicPath):
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281 """Create a child node for subtopic"""
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282 return self.__subtopics.setdefault(subtopic,
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283 _TopicTreeNode(topicPath, self.__onDeadListenerWeakCB))
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284
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285 def hasSubtopic(self, subtopic):
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286 """Return true only if topic string is one of subtopics of this node"""
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287 return self.__subtopics.has_key(subtopic)
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288
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289 def getNode(self, subtopic):
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290 """Return ref to node associated with subtopic"""
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291 return self.__subtopics[subtopic]
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292
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293 def addCallable(self, callable):
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294 """Add a callable to list of callables for this topic node"""
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295 try:
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296 id = self.__callables.index(_getWeakRef(callable))
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297 return self.__callables[id]
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298 except ValueError:
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299 wrCall = _getWeakRef(callable, _NodeCallback(self.__notifyDead))
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300 self.__callables.append(wrCall)
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301 return wrCall
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302
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303 def getCallables(self):
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304 """Get callables associated with this topic node"""
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305 return [cb() for cb in self.__callables if cb() is not None]
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306
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307 def hasCallable(self, callable):
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308 """Return true if callable in this node"""
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309 try:
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310 self.__callables.index(_getWeakRef(callable))
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311 return True
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312 except ValueError:
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313 return False
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314
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315 def sendMessage(self, message):
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316 """Send a message to our callables"""
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317 deliveryCount = 0
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318 for cb in self.__callables:
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319 listener = cb()
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320 if listener is not None:
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321 listener(message)
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322 deliveryCount += 1
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323 return deliveryCount
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324
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325 def removeCallable(self, callable):
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326 """Remove weak callable from our node (and return True).
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327 Does nothing if not here (and returns False)."""
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328 try:
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329 self.__callables.remove(_getWeakRef(callable))
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330 return True
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331 except ValueError:
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332 return False
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333
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334 def clearCallables(self):
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335 """Abandon list of callables to caller. We no longer have
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336 any callables after this method is called."""
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337 tmpList = [cb for cb in self.__callables if cb() is not None]
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338 self.__callables = []
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339 return tmpList
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340
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341 def __notifyDead(self, dead):
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342 """Gets called when a listener dies, thanks to WeakRef"""
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343 #print 'TreeNODE', `self`, 'received death certificate for ', dead
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344 self.__cleanupDead()
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345 if self.__onDeadListenerWeakCB is not None:
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346 cb = self.__onDeadListenerWeakCB()
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347 if cb is not None:
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348 cb(dead)
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349
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350 def __cleanupDead(self):
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351 """Remove all dead objects from list of callables"""
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352 self.__callables = [cb for cb in self.__callables if cb() is not None]
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353
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354 def __str__(self):
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355 """Print us in a not-so-friendly, but readable way, good for debugging."""
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356 strVal = []
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357 for callable in self.getCallables():
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358 strVal.append(_getCallableName(callable))
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359 for topic, node in self.__subtopics.iteritems():
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360 strVal.append(' (%s: %s)' %(topic, node))
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361 return ''.join(strVal)
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362
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363
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364 class _TopicTreeRoot(_TopicTreeNode):
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365 """
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366 The root of the tree knows how to access other node of the
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367 tree and is the gateway of the tree user to the tree nodes.
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368 It can create topics, and and remove callbacks, etc.
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369
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370 For efficiency, it stores a dictionary of listener-topics,
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371 so that unsubscribing a listener just requires finding the
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372 topics associated to a listener, and finding the corresponding
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373 nodes of the tree. Without it, unsubscribing would require
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374 that we search the whole tree for all nodes that contain
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375 given listener. Since Publisher is a singleton, it will
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376 contain all topics in the system so it is likely to be a large
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377 tree. However, it is possible that in some runs, unsubscribe()
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378 is called very little by the user, in which case most unsubscriptions
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379 are automatic, ie caused by the listeners dying. In this case,
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380 a flag is set to indicate that the dictionary should be cleaned up
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381 at the next opportunity. This is not necessary, it is just an
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382 optimization.
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383 """
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384
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385 def __init__(self):
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386 self.__callbackDict = {}
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387 self.__callbackDictCleanup = 0
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388 # all child nodes will call our __rootNotifyDead method
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389 # when one of their registered listeners dies
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390 _TopicTreeNode.__init__(self, (ALL_TOPICS,),
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391 _getWeakRef(self.__rootNotifyDead))
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392
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393 def addTopic(self, topic, listener):
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394 """Add topic to tree if doesnt exist, and add listener to topic node"""
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395 assert isinstance(topic, tuple)
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396 topicNode = self.__getTreeNode(topic, make=True)
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397 weakCB = topicNode.addCallable(listener)
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398 assert topicNode.hasCallable(listener)
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399
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400 theList = self.__callbackDict.setdefault(weakCB, [])
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401 assert self.__callbackDict.has_key(weakCB)
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402 # add it only if we don't already have it
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403 try:
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404 weakTopicNode = WeakRef(topicNode)
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405 theList.index(weakTopicNode)
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406 except ValueError:
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407 theList.append(weakTopicNode)
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408 assert self.__callbackDict[weakCB].index(weakTopicNode) >= 0
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409
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diff changeset
410 def getTopics(self, listener):
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411 """Return the list of topics for given listener"""
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diff changeset
412 weakNodes = self.__callbackDict.get(_getWeakRef(listener), [])
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diff changeset
413 return [weakNode().getPathname() for weakNode in weakNodes
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parents:
diff changeset
414 if weakNode() is not None]
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415
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416 def isSubscribed(self, listener, topic=None):
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parents:
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417 """Return true if listener is registered for topic specified.
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diff changeset
418 If no topic specified, return true if subscribed to something.
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419 Use topic=getStrAllTopics() to determine if a listener will receive
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420 messages for all topics."""
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421 weakCB = _getWeakRef(listener)
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422 if topic is None:
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423 return self.__callbackDict.has_key(weakCB)
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424 else:
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425 topicPath = _tupleize(topic)
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426 for weakNode in self.__callbackDict[weakCB]:
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parents:
diff changeset
427 if topicPath == weakNode().getPathname():
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428 return True
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429 return False
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430
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431 def unsubscribe(self, listener, topicList):
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432 """Remove listener from given list of topics. If topicList
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433 doesn't have any topics for which listener has subscribed,
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434 nothing happens."""
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435 weakCB = _getWeakRef(listener)
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436 if not self.__callbackDict.has_key(weakCB):
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437 return
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438
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439 cbNodes = self.__callbackDict[weakCB]
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440 if topicList is None:
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441 for weakNode in cbNodes:
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442 weakNode().removeCallable(listener)
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443 del self.__callbackDict[weakCB]
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444 return
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445
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446 for weakNode in cbNodes:
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447 node = weakNode()
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448 if node is not None and node.getPathname() in topicList:
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449 success = node.removeCallable(listener)
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450 assert success == True
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451 cbNodes.remove(weakNode)
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452 assert not self.isSubscribed(listener, node.getPathname())
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453
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454 def unsubAll(self, topicList, onNoSuchTopic):
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455 """Unsubscribe all listeners registered for any topic in
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456 topicList. If a topic in the list does not exist, and
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457 onNoSuchTopic is not None, a call
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458 to onNoSuchTopic(topic) is done for that topic."""
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diff changeset
459 for topic in topicList:
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diff changeset
460 node = self.__getTreeNode(topic)
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diff changeset
461 if node is not None:
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462 weakCallables = node.clearCallables()
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463 for callable in weakCallables:
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464 weakNodes = self.__callbackDict[callable]
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465 success = _removeItem(WeakRef(node), weakNodes)
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diff changeset
466 assert success == True
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diff changeset
467 if weakNodes == []:
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diff changeset
468 del self.__callbackDict[callable]
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diff changeset
469 elif onNoSuchTopic is not None:
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diff changeset
470 onNoSuchTopic(topic)
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diff changeset
471
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472 def sendMessage(self, topic, message, onTopicNeverCreated):
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diff changeset
473 """Send a message for given topic to all registered listeners. If
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diff changeset
474 topic doesn't exist, call onTopicNeverCreated(topic)."""
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parents:
diff changeset
475 # send to the all-toipcs listeners
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diff changeset
476 deliveryCount = _TopicTreeNode.sendMessage(self, message)
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parents:
diff changeset
477 # send to those who listen to given topic or any of its supertopics
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parents:
diff changeset
478 node = self
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diff changeset
479 for topicItem in topic:
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parents:
diff changeset
480 assert topicItem != ''
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parents:
diff changeset
481 if node.hasSubtopic(topicItem):
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482 node = node.getNode(topicItem)
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diff changeset
483 deliveryCount += node.sendMessage(message)
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parents:
diff changeset
484 else: # topic never created, don't bother continuing
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parents:
diff changeset
485 if onTopicNeverCreated is not None:
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parents:
diff changeset
486 onTopicNeverCreated(topic)
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parents:
diff changeset
487 break
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parents:
diff changeset
488 return deliveryCount
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489
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parents:
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490 def numListeners(self):
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491 """Return a pair (live, dead) with count of live and dead listeners in tree"""
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parents:
diff changeset
492 dead, live = 0, 0
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parents:
diff changeset
493 for cb in self.__callbackDict:
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parents:
diff changeset
494 if cb() is None:
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parents:
diff changeset
495 dead += 1
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496 else:
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parents:
diff changeset
497 live += 1
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parents:
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498 return live, dead
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parents:
diff changeset
499
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parents:
diff changeset
500 # clean up the callback dictionary after how many dead listeners
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parents:
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501 callbackDeadLimit = 10
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parents:
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502
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parents:
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503 def __rootNotifyDead(self, dead):
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parents:
diff changeset
504 #print 'TreeROOT received death certificate for ', dead
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parents:
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505 self.__callbackDictCleanup += 1
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506 if self.__callbackDictCleanup > _TopicTreeRoot.callbackDeadLimit:
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parents:
diff changeset
507 self.__callbackDictCleanup = 0
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parents:
diff changeset
508 oldDict = self.__callbackDict
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parents:
diff changeset
509 self.__callbackDict = {}
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parents:
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510 for weakCB, weakNodes in oldDict.iteritems():
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parents:
diff changeset
511 if weakCB() is not None:
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parents:
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512 self.__callbackDict[weakCB] = weakNodes
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parents:
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513
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parents:
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514 def __getTreeNode(self, topic, make=False):
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parents:
diff changeset
515 """Return the tree node for 'topic' from the topic tree. If it
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parents:
diff changeset
516 doesnt exist and make=True, create it first."""
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parents:
diff changeset
517 # if the all-topics, give root;
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parents:
diff changeset
518 if topic == (ALL_TOPICS,):
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parents:
diff changeset
519 return self
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parents:
diff changeset
520
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parents:
diff changeset
521 # not root, so traverse tree
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parents:
diff changeset
522 node = self
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parents:
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523 path = ()
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parents:
diff changeset
524 for topicItem in topic:
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parents:
diff changeset
525 path += (topicItem,)
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parents:
diff changeset
526 if topicItem == ALL_TOPICS:
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parents:
diff changeset
527 raise ValueError, 'Topic tuple must not contain ""'
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parents:
diff changeset
528 if make:
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parents:
diff changeset
529 node = node.createSubtopic(topicItem, path)
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parents:
diff changeset
530 elif node.hasSubtopic(topicItem):
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parents:
diff changeset
531 node = node.getNode(topicItem)
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parents:
diff changeset
532 else:
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parents:
diff changeset
533 return None
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parents:
diff changeset
534 # done
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parents:
diff changeset
535 return node
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parents:
diff changeset
536
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parents:
diff changeset
537 def printCallbacks(self):
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parents:
diff changeset
538 strVal = ['Callbacks:\n']
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parents:
diff changeset
539 for listener, weakTopicNodes in self.__callbackDict.iteritems():
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sirebral
parents:
diff changeset
540 topics = [topic() for topic in weakTopicNodes if topic() is not None]
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parents:
diff changeset
541 strVal.append(' %s: %s\n' % (_getCallableName(listener()), topics))
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sirebral
parents:
diff changeset
542 return ''.join(strVal)
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parents:
diff changeset
543
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parents:
diff changeset
544 def __str__(self):
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parents:
diff changeset
545 return 'all: %s' % _TopicTreeNode.__str__(self)
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sirebral
parents:
diff changeset
546
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parents:
diff changeset
547
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sirebral
parents:
diff changeset
548 # -----------------------------------------------------------------------------
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parents:
diff changeset
549
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sirebral
parents:
diff changeset
550 class _SingletonKey: pass
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parents:
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551
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552 class PublisherClass:
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553 """
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554 The publish/subscribe manager. It keeps track of which listeners
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555 are interested in which topics (see subscribe()), and sends a
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556 Message for a given topic to listeners that have subscribed to
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557 that topic, with optional user data (see sendMessage()).
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558
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559 The three important concepts for Publisher are:
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560
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561 - listener: a function, bound method or
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562 callable object that can be called with one parameter
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563 (not counting 'self' in the case of methods). The parameter
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564 will be a reference to a Message object. E.g., these listeners
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565 are ok::
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566
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567 class Foo:
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568 def __call__(self, a, b=1): pass # can be called with only one arg
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569 def meth(self, a): pass # takes only one arg
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570 def meth2(self, a=2, b=''): pass # can be called with one arg
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571
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572 def func(a, b=''): pass
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573
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574 Foo foo
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575 Publisher().subscribe(foo) # functor
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576 Publisher().subscribe(foo.meth) # bound method
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577 Publisher().subscribe(foo.meth2) # bound method
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578 Publisher().subscribe(func) # function
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579
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580 The three types of callables all have arguments that allow a call
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581 with only one argument. In every case, the parameter 'a' will contain
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582 the message.
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583
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584 - topic: a single word, a tuple of words, or a string containing a
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585 set of words separated by dots, for example: 'sports.baseball'.
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586 A tuple or a dotted notation string denotes a hierarchy of
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587 topics from most general to least. For example, a listener of
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588 this topic::
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589
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590 ('sports','baseball')
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591
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592 would receive messages for these topics::
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593
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594 ('sports', 'baseball') # because same
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595 ('sports', 'baseball', 'highscores') # because more specific
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596
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597 but not these::
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598
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599 'sports' # because more general
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600 ('sports',) # because more general
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601 () or ('') # because only for those listening to 'all' topics
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602 ('news') # because different topic
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603
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604 - message: this is an instance of Message, containing the topic for
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605 which the message was sent, and any data the sender specified.
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606
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607 :note: This class is visible to importers of pubsub only as a
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608 Singleton. I.e., every time you execute 'Publisher()', it's
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609 actually the same instance of PublisherClass that is
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610 returned. So to use, just do'Publisher().method()'.
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611
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612 """
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613
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614 __ALL_TOPICS_TPL = (ALL_TOPICS, )
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615
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616 def __init__(self, singletonKey):
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617 """Construct a Publisher. This can only be done by the pubsub
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618 module. You just use pubsub.Publisher()."""
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619 if not isinstance(singletonKey, _SingletonKey):
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620 raise invalid_argument("Use Publisher() to get access to singleton")
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621 self.__messageCount = 0
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622 self.__deliveryCount = 0
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623 self.__topicTree = _TopicTreeRoot()
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624
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625 #
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626 # Public API
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627 #
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628
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629 def getDeliveryCount(self):
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630 """How many listeners have received a message since beginning of run"""
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631 return self.__deliveryCount
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632
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633 def getMessageCount(self):
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634 """How many times sendMessage() was called since beginning of run"""
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635 return self.__messageCount
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636
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637 def subscribe(self, listener, topic = ALL_TOPICS):
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638 """
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639 Subscribe listener for given topic. If topic is not specified,
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640 listener will be subscribed for all topics (that listener will
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641 receive a Message for any topic for which a message is generated).
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642
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643 This method may be called multiple times for one listener,
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644 registering it with many topics. It can also be invoked many
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645 times for a particular topic, each time with a different
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646 listener. See the class doc for requirements on listener and
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647 topic.
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648
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649 :note: The listener is held by Publisher() only by *weak*
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650 reference. This means you must ensure you have at
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651 least one strong reference to listener, otherwise it
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652 will be DOA ("dead on arrival"). This is particularly
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653 easy to forget when wrapping a listener method in a
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654 proxy object (e.g. to bind some of its parameters),
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655 e.g.::
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656
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657 class Foo:
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658 def listener(self, event): pass
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659 class Wrapper:
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660 def __init__(self, fun): self.fun = fun
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661 def __call__(self, *args): self.fun(*args)
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662 foo = Foo()
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663 Publisher().subscribe( Wrapper(foo.listener) ) # whoops: DOA!
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664 wrapper = Wrapper(foo.listener)
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665 Publisher().subscribe(wrapper) # good!
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666
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667 :note: Calling this method for the same listener, with two
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668 topics in the same branch of the topic hierarchy, will
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669 cause the listener to be notified twice when a message
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670 for the deepest topic is sent. E.g.
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671 subscribe(listener, 't1') and then subscribe(listener,
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672 ('t1','t2')) means that when calling sendMessage('t1'),
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673 listener gets one message, but when calling
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674 sendMessage(('t1','t2')), listener gets message twice.
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675
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676 """
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677 self.validate(listener)
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678
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679 if topic is None:
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680 raise TypeError, 'Topic must be either a word, tuple of '\
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681 'words, or getStrAllTopics()'
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682
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683 self.__topicTree.addTopic(_tupleize(topic), listener)
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684
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685 def isSubscribed(self, listener, topic=None):
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686 """Return true if listener has subscribed to topic specified.
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687 If no topic specified, return true if subscribed to something.
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688 Use topic=getStrAllTopics() to determine if a listener will receive
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689 messages for all topics."""
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690 return self.__topicTree.isSubscribed(listener, topic)
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691
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692 def validate(self, listener):
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693 """Similar to isValid(), but raises a TypeError exception if not valid"""
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694 # check callable
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695 if not callable(listener):
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696 raise TypeError, 'Listener '+`listener`+' must be a '\
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697 'function, bound method or instance.'
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698 # ok, callable, but if method, is it bound:
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699 elif ismethod(listener) and not _isbound(listener):
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700 raise TypeError, 'Listener '+`listener`+\
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701 ' is a method but it is unbound!'
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702
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703 # check that it takes the right number of parameters
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704 min, d = _paramMinCount(listener)
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parents:
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705 if min > 1:
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706 raise TypeError, 'Listener '+`listener`+" can't"\
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707 ' require more than one parameter!'
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708 if min <= 0 and d == 0:
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709 raise TypeError, 'Listener '+`listener`+' lacking arguments!'
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710
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711 assert (min == 0 and d>0) or (min == 1)
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712
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713 def isValid(self, listener):
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714 """Return true only if listener will be able to subscribe to
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715 Publisher."""
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716 try:
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717 self.validate(listener)
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718 return True
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719 except TypeError:
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720 return False
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721
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722 def unsubAll(self, topics=None, onNoSuchTopic=None):
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723 """Unsubscribe all listeners subscribed for topics. Topics can
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724 be a single topic (string or tuple) or a list of topics (ie
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725 list containing strings and/or tuples). If topics is not
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726 specified, all listeners for all topics will be unsubscribed,
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727 ie. the Publisher singleton will have no topics and no listeners
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728 left. If onNoSuchTopic is given, it will be called as
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729 onNoSuchTopic(topic) for each topic that is unknown.
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730 """
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731 if topics is None:
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732 del self.__topicTree
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733 self.__topicTree = _TopicTreeRoot()
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734 return
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735
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736 # make sure every topics are in tuple form
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737 if isinstance(topics, list):
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738 topicList = [_tupleize(x) for x in topics]
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739 else:
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740 topicList = [_tupleize(topics)]
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741
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742 # unsub every listener of topics
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743 self.__topicTree.unsubAll(topicList, onNoSuchTopic)
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744
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745 def unsubscribe(self, listener, topics=None):
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746 """Unsubscribe listener. If topics not specified, listener is
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747 completely unsubscribed. Otherwise, it is unsubscribed only
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748 for the topic (the usual tuple) or list of topics (ie a list
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749 of tuples) specified. Nothing happens if listener is not actually
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750 subscribed to any of the topics.
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751
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752 Note that if listener subscribed for two topics (a,b) and (a,c),
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753 then unsubscribing for topic (a) will do nothing. You must
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754 use getAssociatedTopics(listener) and give unsubscribe() the returned
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755 list (or a subset thereof).
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756 """
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757 self.validate(listener)
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758 topicList = None
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759 if topics is not None:
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760 if isinstance(topics, list):
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761 topicList = [_tupleize(x) for x in topics]
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762 else:
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763 topicList = [_tupleize(topics)]
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764
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765 self.__topicTree.unsubscribe(listener, topicList)
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766
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767 def getAssociatedTopics(self, listener):
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768 """Return a list of topics the given listener is registered with.
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769 Returns [] if listener never subscribed.
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770
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771 :attention: when using the return of this method to compare to
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772 expected list of topics, remember that topics that are
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773 not in the form of a tuple appear as a one-tuple in
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774 the return. E.g. if you have subscribed a listener to
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parents:
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775 'topic1' and ('topic2','subtopic2'), this method
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parents:
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776 returns::
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777
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778 associatedTopics = [('topic1',), ('topic2','subtopic2')]
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779 """
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780 return self.__topicTree.getTopics(listener)
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781
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782 def sendMessage(self, topic=ALL_TOPICS, data=None, onTopicNeverCreated=None):
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783 """Send a message for given topic, with optional data, to
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784 subscribed listeners. If topic is not specified, only the
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parents:
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785 listeners that are interested in all topics will receive message.
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parents:
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786 The onTopicNeverCreated is an optional callback of your choice that
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787 will be called if the topic given was never created (i.e. it, or
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788 one of its subtopics, was never subscribed to by any listener).
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789 It will be called as onTopicNeverCreated(topic)."""
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790 aTopic = _tupleize(topic)
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parents:
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791 message = Message(aTopic, data)
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parents:
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792 self.__messageCount += 1
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793
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794 # send to those who listen to all topics
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parents:
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795 self.__deliveryCount += \
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796 self.__topicTree.sendMessage(aTopic, message, onTopicNeverCreated)
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797
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parents:
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798 #
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parents:
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799 # Private methods
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parents:
diff changeset
800 #
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801
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802 def __call__(self):
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803 """Allows for singleton"""
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804 return self
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805
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806 def __str__(self):
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parents:
diff changeset
807 return str(self.__topicTree)
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808
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parents:
diff changeset
809 # Create the Publisher singleton. We prevent users from (inadvertently)
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parents:
diff changeset
810 # instantiating more than one object, by requiring a key that is
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parents:
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811 # accessible only to module. From
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parents:
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812 # this point forward any calls to Publisher() will invoke the __call__
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parents:
diff changeset
813 # of this instance which just returns itself.
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diff changeset
814 #
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parents:
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815 # The only flaw with this approach is that you can't derive a new
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parents:
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816 # class from Publisher without jumping through hoops. If this ever
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817 # becomes an issue then a new Singleton implementaion will need to be
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818 # employed.
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819 _key = _SingletonKey()
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820 Publisher = PublisherClass(_key)
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821
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822
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parents:
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823 #---------------------------------------------------------------------------
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824
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825 class Message:
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parents:
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826 """
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827 A simple container object for the two components of a message: the
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parents:
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828 topic and the user data. An instance of Message is given to your
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parents:
diff changeset
829 listener when called by Publisher().sendMessage(topic) (if your
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sirebral
parents:
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830 listener callback was registered for that topic).
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831 """
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832 def __init__(self, topic, data):
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833 self.topic = topic
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834 self.data = data
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835
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836 def __str__(self):
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837 return '[Topic: '+`self.topic`+', Data: '+`self.data`+']'