annotate idavoll/iidavoll.py @ 207:43a4d0d6c076

Release Idavoll 0.8.0.
author Ralph Meijer <ralphm@ik.nu>
date Tue, 05 Aug 2008 18:23:45 +0000
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children
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c61034369463 Released Idavoll 0.7.0.
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1 # Copyright (c) 2003-2008 Ralph Meijer
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2 # See LICENSE for details.
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3
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4 """
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5 Interfaces for idavoll.
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6 """
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7
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8 from zope.interface import Attribute, Interface
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9
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10 class IBackendService(Interface):
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11 """ Interface to a backend service of a pubsub service. """
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12
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13
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14 def __init__(storage):
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15 """
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274a45d2a5ab Implement root collection that includes all leaf nodes.
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16 @param storage: Object providing L{IStorage}.
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17 """
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19
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20 def supportsPublisherAffiliation():
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21 """ Reports if the backend supports the publisher affiliation.
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22
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23 @rtype: C{bool}
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24 """
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25
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27 def supportsOutcastAffiliation():
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28 """ Reports if the backend supports the publisher affiliation.
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29
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30 @rtype: C{bool}
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31 """
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34 def supportsPersistentItems():
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35 """ Reports if the backend supports persistent items.
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37 @rtype: C{bool}
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38 """
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40
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41 def getNodeType(nodeIdentifier):
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42 """ Return type of a node.
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43
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44 @return: a deferred that returns either 'leaf' or 'collection'
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45 """
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47
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48 def getNodes():
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49 """ Returns list of all nodes.
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50
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51 @return: a deferred that returns a C{list} of node ids.
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52 """
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55 def getNodeMetaData(nodeIdentifier):
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56 """ Return meta data for a node.
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57
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58 @return: a deferred that returns a C{list} of C{dict}s with the
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59 metadata.
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60 """
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63 def createNode(nodeIdentifier, requestor):
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64 """ Create a node.
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65
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66 @return: a deferred that fires when the node has been created.
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67 """
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70 def registerPreDelete(preDeleteFn):
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71 """ Register a callback that is called just before a node deletion.
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73 The function C{preDeletedFn} is added to a list of functions to be
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74 called just before deletion of a node. The callback C{preDeleteFn} is
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75 called with the C{nodeIdentifier} that is about to be deleted and
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76 should return a deferred that returns a list of deferreds that are to
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77 be fired after deletion. The backend collects the lists from all these
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78 callbacks before actually deleting the node in question. After
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79 deletion all collected deferreds are fired to do post-processing.
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81 The idea is that you want to be able to collect data from the node
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82 before deleting it, for example to get a list of subscribers that have
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83 to be notified after the node has been deleted. To do this,
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84 C{preDeleteFn} fetches the subscriber list and passes this list to a
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85 callback attached to a deferred that it sets up. This deferred is
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86 returned in the list of deferreds.
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87 """
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90 def deleteNode(nodeIdentifier, requestor):
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91 """ Delete a node.
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93 @return: a deferred that fires when the node has been deleted.
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94 """
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97 def purgeNode(nodeIdentifier, requestor):
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98 """ Removes all items in node from persistent storage """
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101 def subscribe(nodeIdentifier, subscriber, requestor):
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102 """ Request the subscription of an entity to a pubsub node.
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103
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104 Depending on the node's configuration and possible business rules, the
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105 C{subscriber} is added to the list of subscriptions of the node with id
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106 C{nodeIdentifier}. The C{subscriber} might be different from the
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107 C{requestor}, and if the C{requestor} is not allowed to subscribe this
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108 entity an exception should be raised.
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110 @return: a deferred that returns the subscription state
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111 """
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112
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114 def unsubscribe(nodeIdentifier, subscriber, requestor):
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115 """ Cancel the subscription of an entity to a pubsub node.
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117 The subscription of C{subscriber} is removed from the list of
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118 subscriptions of the node with id C{nodeIdentifier}. If the
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119 C{requestor} is not allowed to unsubscribe C{subscriber}, an an
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120 exception should be raised.
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121
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122 @return: a deferred that fires when unsubscription is complete.
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123 """
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124
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126 def getSubscribers(nodeIdentifier):
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127 """ Get node subscriber list.
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129 @return: a deferred that fires with the list of subscribers.
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130 """
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133 def getSubscriptions(entity):
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134 """ Report the list of current subscriptions with this pubsub service.
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135
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136 Report the list of the current subscriptions with all nodes within this
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137 pubsub service, for the C{entity}.
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138
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139 @return: a deferred that returns the list of all current subscriptions
198
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140 as tuples C{(nodeIdentifier, subscriber, subscription)}.
167
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141 """
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142
198
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143
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144 def getAffiliations(entity):
167
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145 """ Report the list of current affiliations with this pubsub service.
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146
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147 Report the list of the current affiliations with all nodes within this
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148 pubsub service, for the C{entity}.
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149
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150 @return: a deferred that returns the list of all current affiliations
198
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151 as tuples C{(nodeIdentifier, affiliation)}.
167
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152 """
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153
198
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154
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155 def publish(nodeIdentifier, items, requestor):
167
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156 """ Publish items to a pubsub node.
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157
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158 @return: a deferred that fires when the items have been published.
173
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159 @rtype: L{Deferred<twisted.internet.defer.Deferred>}
167
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160 """
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161
198
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162
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163 def registerNotifier(observerfn, *args, **kwargs):
167
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164 """ Register callback which is called for notification. """
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165
198
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166
206
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167 def getNotifications(nodeIdentifier, items):
167
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168 """
206
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169 Get notification list.
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170
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171 This method is called to discover which entities should receive
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172 notifications for the given items that have just been published to the
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173 given node.
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174
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175 The notification list contains tuples (subscriber, subscriptions,
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176 items) to result in one notification per tuple: the given subscriptions
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177 yielded the given items to be notified to this subscriber. This
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178 structure is needed allow for letting the subscriber know which
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179 subscriptions yielded which notifications, while catering for
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180 collection nodes and content-based subscriptions.
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181
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182 To minimize the amount of notifications per entity, implementers
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183 should take care that if all items in C{items} were yielded
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184 by the same set of subscriptions, exactly one tuple is for this
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185 subscriber is returned, so that the subscriber would get exactly one
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186 notification. Alternatively, one tuple per subscription combination.
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187
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188 @param nodeIdentifier: The identifier of the node the items were
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189 published to.
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190 @type nodeIdentifier: C{unicode}.
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191 @param items: The list of published items as
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192 L{Element<twisted.words.xish.domish.Element>}s.
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193 @type items: C{list}
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194 @return: The notification list as tuples of
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195 (L{JID<twisted.words.protocols.jabber.jid.JID>},
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196 C{list} of L{Subscription<wokkel.pubsub.Subscription>},
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197 C{list} of L{Element<twisted.words.xish.domish.Element>}.
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198 @rtype: C{list}
167
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199 """
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200
198
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201
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202 def getItems(nodeIdentifier, requestor, maxItems=None, itemIdentifiers=[]):
167
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203 """ Retrieve items from persistent storage
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204
198
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205 If C{maxItems} is given, return the C{maxItems} last published
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206 items, else if C{itemIdentifiers} is not empty, return the items
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207 requested. If neither is given, return all items.
167
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208
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209 @return: a deferred that returns the requested items
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210 """
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211
198
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212
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213 def retractItem(nodeIdentifier, itemIdentifier, requestor):
167
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214 """ Removes item in node from persistent storage """
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215
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216
198
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217
167
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218 class IStorage(Interface):
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219 """
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220 Storage interface.
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221 """
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222
198
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223
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224 def getNode(nodeIdentifier):
167
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225 """
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226 Get Node.
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227
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228 @param nodeIdentifier: NodeID of the desired node.
206
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229 @type nodeIdentifier: C{str}
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230 @return: deferred that returns a L{INode} providing object.
167
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231 """
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232
198
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233
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234 def getNodeIds():
167
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235 """
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236 Return all NodeIDs.
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237
206
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238 @return: deferred that returns a list of NodeIDs (C{unicode}).
167
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239 """
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240
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241
206
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242 def createNode(nodeIdentifier, owner, config):
167
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243 """
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244 Create new node.
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245
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246 The implementation should make sure, the passed owner JID is stripped
206
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247 of the resource (e.g. using C{owner.userhostJID()}). The passed config
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248 is expected to have values for the fields returned by
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249 L{getDefaultConfiguration}, as well as a value for
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250 C{'pubsub#node_type'}.
167
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251
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252 @param nodeIdentifier: NodeID of the new node.
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253 @type nodeIdentifier: C{unicode}
167
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254 @param owner: JID of the new nodes's owner.
206
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255 @type owner: L{JID<twisted.words.protocols.jabber.jid.JID>}
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256 @param config: Node configuration.
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257 @type config: C{dict}
167
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258 @return: deferred that fires on creation.
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259 """
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260
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261
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262 def deleteNode(nodeIdentifier):
167
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263 """
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264 Delete a node.
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265
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266 @param nodeIdentifier: NodeID of the new node.
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267 @type nodeIdentifier: C{unicode}
167
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268 @return: deferred that fires on deletion.
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269 """
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270
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271
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272 def getAffiliations(entity):
167
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273 """
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274 Get all affiliations for entity.
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275
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276 The implementation should make sure, the passed owner JID is stripped
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277 of the resource (e.g. using C{owner.userhostJID()}).
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278
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279 @param entity: JID of the entity.
206
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280 @type entity: L{JID<twisted.words.protocols.jabber.jid.JID>}
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281 @return: deferred that returns a C{list} of tuples of the form
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282 C{(nodeIdentifier, affiliation)}, where C{nodeIdentifier} is
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283 of the type L{unicode} and C{affiliation} is one of
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284 C{'owner'}, C{'publisher'} and C{'outcast'}.
167
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285 """
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286
198
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287
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288 def getSubscriptions(entity):
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289 """
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290 Get all subscriptions for an entity.
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291
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292 The implementation should make sure, the passed owner JID is stripped
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293 of the resource (e.g. using C{owner.userhostJID()}).
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294
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295 @param entity: JID of the entity.
206
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296 @type entity: L{JID<twisted.words.protocols.jabber.jid.JID>}
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297 @return: deferred that returns a C{list} of tuples of the form
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298 C{(nodeIdentifier, subscriber, state)}, where
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299 C{nodeIdentifier} is of the type C{unicode}, C{subscriber} of
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300 the type J{JID<twisted.words.protocols.jabber.jid.JID>}, and
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301 C{state} is C{'subscribed'}, C{'pending'} or
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302 C{'unconfigured'}.
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303 """
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304
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305
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306 def getDefaultConfiguration(nodeType):
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307 """
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308 Get the default configuration for the given node type.
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309
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310 @param nodeType: Either C{'leaf'} or C{'collection'}.
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311 @type nodeType: C{str}
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312 @return: The default configuration.
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313 @rtype: C{dict}.
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314 @raises: L{idavoll.error.NoCollections} if collections are not
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315 supported.
167
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316 """
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317
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318
198
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319
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320 class INode(Interface):
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321 """
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322 Interface to the class of objects that represent nodes.
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323 """
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324
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325 nodeType = Attribute("""The type of this node. One of {'leaf'},
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326 {'collection'}.""")
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327 nodeIdentifier = Attribute("""The node identifer of this node""")
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328
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329
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330 def getType():
167
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331 """
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332 Get node's type.
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333
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334 @return: C{'leaf'} or C{'collection'}.
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335 """
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336
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337
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338 def getConfiguration():
167
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339 """
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340 Get node's configuration.
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341
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342 The configuration must at least have two options:
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343 C{pubsub#persist_items}, and C{pubsub#deliver_payloads}.
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344
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345 @return: C{dict} of configuration options.
167
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346 """
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347
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348
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349 def getMetaData():
167
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350 """
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351 Get node's meta data.
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352
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353 The meta data must be a superset of the configuration options, and
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354 also at least should have a C{pubsub#node_type} entry.
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355
206
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356 @return: C{dict} of meta data.
167
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357 """
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358
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359
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360 def setConfiguration(options):
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361 """
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362 Set node's configuration.
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363
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364 The elements of {options} will set the new values for those
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365 configuration items. This means that only changing items have to
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366 be given.
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367
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368 @param options: a dictionary of configuration options.
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369 @returns: a deferred that fires upon success.
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370 """
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371
198
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372
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373 def getAffiliation(entity):
167
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374 """
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375 Get affiliation of entity with this node.
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376
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377 @param entity: JID of entity.
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378 @type entity: L{JID<twisted.words.protocols.jabber.jid.JID>}
167
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379 @return: deferred that returns C{'owner'}, C{'publisher'}, C{'outcast'}
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380 or C{None}.
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381 """
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382
198
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383
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384 def getSubscription(subscriber):
167
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385 """
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386 Get subscription to this node of subscriber.
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387
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388 @param subscriber: JID of the new subscriptions' entity.
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389 @type subscriber: L{JID<twisted.words.protocols.jabber.jid.JID>}
167
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390 @return: deferred that returns the subscription state (C{'subscribed'},
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391 C{'pending'} or C{None}).
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392 """
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393
198
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394
206
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395 def getSubscriptions(state=None):
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396 """
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397 Get list of subscriptions to this node.
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398
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399 The optional C{state} argument filters the subscriptions to their
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400 state.
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401
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402 @param state: Subscription state filter. One of C{'subscribed'},
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403 C{'pending'}, C{'unconfigured'}.
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404 @type state: C{str}
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405 @return: a deferred that returns a C{list} of
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406 L{wokkel.pubsub.Subscription}s.
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407 """
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408
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409
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410 def addSubscription(subscriber, state, config):
167
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411 """
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parents:
diff changeset
412 Add new subscription to this node with given state.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
413
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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414 @param subscriber: JID of the new subscriptions' entity.
206
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415 @type subscriber: L{JID<twisted.words.protocols.jabber.jid.JID>}
167
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416 @param state: C{'subscribed'} or C{'pending'}
206
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417 @type state: C{str}
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418 @param config: Subscription configuration.
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419 @param config: C{dict}
167
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420 @return: deferred that fires on subscription.
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parents:
diff changeset
421 """
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422
198
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diff changeset
423
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424 def removeSubscription(subscriber):
167
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425 """
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Ralph Meijer <ralphm@ik.nu>
parents:
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426 Remove subscription to this node.
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parents:
diff changeset
427
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428 @param subscriber: JID of the subscriptions' entity.
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429 @type subscriber: L{JID<twisted.words.protocols.jabber.jid.JID>}
167
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430 @return: deferred that fires on removal.
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
431 """
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432
198
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433
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434 def isSubscribed(entity):
167
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435 """
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Ralph Meijer <ralphm@ik.nu>
parents:
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436 Returns whether entity has any subscription to this node.
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
437
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parents:
diff changeset
438 Only returns C{True} when the subscription state (if present) is
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parents:
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439 C{'subscribed'} for any subscription that matches the bare JID.
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parents:
diff changeset
440
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441 @param subscriber: bare JID of the subscriptions' entity.
206
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diff changeset
442 @type subscriber: L{JID<twisted.words.protocols.jabber.jid.JID>}
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443 @return: deferred that returns a C{bool}.
167
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parents:
diff changeset
444 """
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445
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diff changeset
446
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diff changeset
447 def getAffiliations():
167
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parents:
diff changeset
448 """
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parents:
diff changeset
449 Get affiliations of entities with this node.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
450
206
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diff changeset
451 @return: deferred that returns a C{list} of tuples (jid, affiliation),
274a45d2a5ab Implement root collection that includes all leaf nodes.
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parents: 204
diff changeset
452 where jid is a L(JID<twisted.words.protocols.jabber.jid.JID>)
274a45d2a5ab Implement root collection that includes all leaf nodes.
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parents: 204
diff changeset
453 and affiliation is one of C{'owner'},
167
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
454 C{'publisher'}, C{'outcast'}.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
455 """
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
456
198
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parents: 189
diff changeset
457
e404775b12df Change naming and spacing conventions to match Twisted's.
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parents: 189
diff changeset
458
167
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parents:
diff changeset
459 class ILeafNode(Interface):
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
460 """
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
461 Interface to the class of objects that represent leaf nodes.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
462 """
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parents:
diff changeset
463
198
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diff changeset
464 def storeItems(items, publisher):
167
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diff changeset
465 """
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
466 Store items in persistent storage for later retrieval.
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
467
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parents:
diff changeset
468 @param items: The list of items to be stored. Each item is the
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
469 L{domish} representation of the XML fragment as defined
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
470 for C{<item/>} in the
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
471 C{http://jabber.org/protocol/pubsub} namespace.
206
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diff changeset
472 @type items: C{list} of {domish.Element}
167
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parents:
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473 @param publisher: JID of the publishing entity.
206
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diff changeset
474 @type publisher: L{JID<twisted.words.protocols.jabber.jid.JID>}
167
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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475 @return: deferred that fires upon success.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
476 """
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
477
198
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diff changeset
478
e404775b12df Change naming and spacing conventions to match Twisted's.
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diff changeset
479 def removeItems(itemIdentifiers):
167
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480 """
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parents:
diff changeset
481 Remove items by id.
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parents:
diff changeset
482
206
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diff changeset
483 @param itemIdentifiers: C{list} of item ids.
274a45d2a5ab Implement root collection that includes all leaf nodes.
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diff changeset
484 @return: deferred that fires with a C{list} of ids of the items that
167
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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485 were deleted
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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diff changeset
486 """
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diff changeset
487
198
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diff changeset
488
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489 def getItems(maxItems=None):
167
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490 """
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Ralph Meijer <ralphm@ik.nu>
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diff changeset
491 Get items.
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diff changeset
492
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493 If C{maxItems} is not given, all items in the node are returned,
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494 just like C{getItemsById}. Otherwise, C{maxItems} limits
167
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495 the returned items to a maximum of that number of most recently
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
diff changeset
496 published items.
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diff changeset
497
198
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498 @param maxItems: if given, a natural number (>0) that limits the
167
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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diff changeset
499 returned number of items.
206
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diff changeset
500 @return: deferred that fires with a C{list} of found items.
167
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parents:
diff changeset
501 """
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diff changeset
502
198
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parents: 189
diff changeset
503
e404775b12df Change naming and spacing conventions to match Twisted's.
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diff changeset
504 def getItemsById(itemIdentifiers):
167
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
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parents:
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505 """
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
506 Get items by item id.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
507
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
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diff changeset
508 Each item in the returned list is a unicode string that
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
509 represent the XML of the item as it was published, including the
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
510 item wrapper with item id.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
511
206
274a45d2a5ab Implement root collection that includes all leaf nodes.
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parents: 204
diff changeset
512 @param itemIdentifiers: C{list} of item ids.
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parents: 204
diff changeset
513 @return: deferred that fires with a C{list} of found items.
167
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
514 """
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
515
198
e404775b12df Change naming and spacing conventions to match Twisted's.
Ralph Meijer <ralphm@ik.nu>
parents: 189
diff changeset
516
167
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
517 def purge():
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
518 """
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Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
519 Purge node of all items in persistent storage.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
520
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
diff changeset
521 @return: deferred that fires when the node has been purged.
ef22e4150caa Move protocol implementations (pubsub, disco, forms) to and depend on wokkel.
Ralph Meijer <ralphm@ik.nu>
parents:
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522 """
204
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parents: 198
diff changeset
523
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
Ralph Meijer <ralphm@ik.nu>
parents: 198
diff changeset
524
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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parents: 198
diff changeset
525
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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diff changeset
526 class IGatewayStorage(Interface):
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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diff changeset
527
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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diff changeset
528 def addCallback(service, nodeIdentifier, callback):
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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diff changeset
529 """
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parents: 198
diff changeset
530 Register a callback URI.
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parents: 198
diff changeset
531
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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parents: 198
diff changeset
532 The registered HTTP callback URI will have an Atom Entry documented
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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parents: 198
diff changeset
533 POSTed to it upon receiving a notification for the given pubsub node.
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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parents: 198
diff changeset
534
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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parents: 198
diff changeset
535 @param service: The XMPP entity that holds the node.
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parents: 198
diff changeset
536 @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}
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parents: 198
diff changeset
537 @param nodeIdentifier: The identifier of the publish-subscribe node.
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parents: 198
diff changeset
538 @type nodeIdentifier: C{unicode}.
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Ralph Meijer <ralphm@ik.nu>
parents: 198
diff changeset
539 @param callback: The callback URI to be registered.
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parents: 198
diff changeset
540 @type callback: C{str}.
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parents: 198
diff changeset
541 @rtype: L{Deferred<twisted.internet.defer.Deferred>}
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Ralph Meijer <ralphm@ik.nu>
parents: 198
diff changeset
542 """
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parents: 198
diff changeset
543
b4bf0a5ce50d Implement storage facilities for the HTTP gateway.
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parents: 198
diff changeset
544 def removeCallback(service, nodeIdentifier, callback):
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545 """
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546 Remove a registered callback URI.
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547
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548 The returned deferred will fire with a boolean that signals wether or
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549 not this was the last callback unregistered for this node.
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550
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551 @param service: The XMPP entity that holds the node.
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552 @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}
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553 @param nodeIdentifier: The identifier of the publish-subscribe node.
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554 @type nodeIdentifier: C{unicode}.
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555 @param callback: The callback URI to be unregistered.
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556 @type callback: C{str}.
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557 @rtype: L{Deferred<twisted.internet.defer.Deferred>}
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558 """
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559
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560 def getCallbacks(service, nodeIdentifier):
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561 """
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562 Get the callbacks registered for this node.
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563
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564 Returns a deferred that fires with the set of HTTP callback URIs
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565 registered for this node.
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566
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567 @param service: The XMPP entity that holds the node.
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568 @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}
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569 @param nodeIdentifier: The identifier of the publish-subscribe node.
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570 @type nodeIdentifier: C{unicode}.
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571 @rtype: L{Deferred<twisted.internet.defer.Deferred>}
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572 """
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573
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574
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575 def hasCallbacks(service, nodeIdentifier):
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576 """
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577 Return wether there are callbacks registered for a node.
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578
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579 @param service: The XMPP entity that holds the node.
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580 @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}
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581 @param nodeIdentifier: The identifier of the publish-subscribe node.
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582 @type nodeIdentifier: C{unicode}.
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583 @returns: Deferred that fires with a boolean.
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584 @rtype: L{Deferred<twisted.internet.defer.Deferred>}
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585 """