Mercurial > libervia-pubsub
annotate idavoll/iidavoll.py @ 196:00a6dbfbee42
Return deferreds on failure, instead of raising exceptions.
author | Ralph Meijer <ralphm@ik.nu> |
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date | Tue, 10 Jun 2008 08:28:57 +0000 |
parents | c61034369463 |
children | e404775b12df |
rev | line source |
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189 | 1 # Copyright (c) 2003-2008 Ralph Meijer |
167
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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 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 def __init__(storage): |
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14 """ |
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15 @param storage: L{storage} object. |
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16 """ |
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17 |
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18 def supports_publisher_affiliation(): |
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19 """ Reports if the backend supports the publisher affiliation. |
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20 |
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21 @rtype: C{bool} |
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22 """ |
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23 |
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24 def supports_outcast_affiliation(): |
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25 """ Reports if the backend supports the publisher affiliation. |
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26 |
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27 @rtype: C{bool} |
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28 """ |
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29 |
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30 def supports_persistent_items(): |
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31 """ Reports if the backend supports persistent items. |
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32 |
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33 @rtype: C{bool} |
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34 """ |
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35 |
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36 def get_node_type(node_id): |
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37 """ Return type of a node. |
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38 |
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39 @return: a deferred that returns either 'leaf' or 'collection' |
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40 """ |
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41 |
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42 def get_nodes(): |
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43 """ Returns list of all nodes. |
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44 |
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45 @return: a deferred that returns a C{list} of node ids. |
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46 """ |
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47 |
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48 def get_node_meta_data(node_id): |
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49 """ Return meta data for a node. |
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50 |
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51 @return: a deferred that returns a C{list} of C{dict}s with the |
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52 metadata. |
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53 """ |
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54 |
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55 def create_node(node_id, requestor): |
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56 """ Create a node. |
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57 |
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58 @return: a deferred that fires when the node has been created. |
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59 """ |
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60 |
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61 def register_pre_delete(pre_delete_fn): |
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62 """ Register a callback that is called just before a node deletion. |
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63 |
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64 The function C{pre_deleted_fn} is added to a list of functions |
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65 to be called just before deletion of a node. The callback |
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66 C{pre_delete_fn} is called with the C{node_id} that is about to be |
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67 deleted and should return a deferred that returns a list of deferreds |
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68 that are to be fired after deletion. The backend collects the lists |
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69 from all these callbacks before actually deleting the node in question. |
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70 After deletion all collected deferreds are fired to do post-processing. |
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71 |
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72 The idea is that you want to be able to collect data from the |
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73 node before deleting it, for example to get a list of subscribers |
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74 that have to be notified after the node has been deleted. To do this, |
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75 C{pre_delete_fn} fetches the subscriber list and passes this |
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76 list to a callback attached to a deferred that it sets up. This |
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77 deferred is returned in the list of deferreds. |
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78 """ |
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79 |
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80 def delete_node(node_id, requestor): |
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81 """ Delete a node. |
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82 |
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83 @return: a deferred that fires when the node has been deleted. |
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84 """ |
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85 |
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86 def purge_node(node_id, requestor): |
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87 """ Removes all items in node from persistent storage """ |
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88 |
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89 def subscribe(node_id, subscriber, requestor): |
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90 """ Request the subscription of an entity to a pubsub node. |
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91 |
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92 Depending on the node's configuration and possible business rules, the |
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93 C{subscriber} is added to the list of subscriptions of the node with id |
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94 C{node_id}. The C{subscriber} might be different from the C{requestor}, |
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95 and if the C{requestor} is not allowed to subscribe this entity an |
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96 exception should be raised. |
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97 |
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98 @return: a deferred that returns the subscription state |
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99 """ |
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100 |
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101 def unsubscribe(node_id, subscriber, requestor): |
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102 """ Cancel the subscription of an entity to a pubsub node. |
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103 |
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104 The subscription of C{subscriber} is removed from the list of |
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105 subscriptions of the node with id C{node_id}. If the C{requestor} |
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106 is not allowed to unsubscribe C{subscriber}, an an exception should |
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107 be raised. |
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108 |
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109 @return: a deferred that fires when unsubscription is complete. |
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110 """ |
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111 |
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112 def get_subscribers(node_id): |
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113 """ Get node subscriber list. |
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114 |
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115 @return: a deferred that fires with the list of subscribers. |
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116 """ |
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117 |
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118 def get_subscriptions(entity): |
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119 """ Report the list of current subscriptions with this pubsub service. |
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120 |
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121 Report the list of the current subscriptions with all nodes within this |
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122 pubsub service, for the C{entity}. |
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123 |
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124 @return: a deferred that returns the list of all current subscriptions |
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125 as tuples C{(node_id, subscriber, subscription)}. |
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126 """ |
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127 |
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128 def get_affiliations(entity): |
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129 """ Report the list of current affiliations with this pubsub service. |
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130 |
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131 Report the list of the current affiliations with all nodes within this |
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132 pubsub service, for the C{entity}. |
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133 |
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134 @return: a deferred that returns the list of all current affiliations |
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135 as tuples C{(node_id, affiliation)}. |
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136 """ |
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137 |
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138 def publish(node_id, items, requestor): |
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139 """ Publish items to a pubsub node. |
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140 |
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141 @return: a deferred that fires when the items have been published. |
173
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167
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142 @rtype: L{Deferred<twisted.internet.defer.Deferred>} |
167
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143 """ |
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144 |
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145 def register_notifier(observerfn, *args, **kwargs): |
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146 """ Register callback which is called for notification. """ |
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147 |
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148 def get_notification_list(node_id, items): |
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149 """ |
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150 Get list of entities to notify. |
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151 """ |
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152 |
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153 def get_items(node_id, requestor, max_items=None, item_ids=[]): |
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154 """ Retrieve items from persistent storage |
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155 |
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156 If C{max_items} is given, return the C{max_items} last published |
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157 items, else if C{item_ids} is not empty, return the items requested. |
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158 If neither is given, return all items. |
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159 |
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160 @return: a deferred that returns the requested items |
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161 """ |
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162 |
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163 def retract_item(node_id, item_id, requestor): |
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164 """ Removes item in node from persistent storage """ |
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165 |
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166 |
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167 class IStorage(Interface): |
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168 """ |
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169 Storage interface. |
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170 """ |
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171 |
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172 def get_node(node_id): |
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173 """ |
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174 Get Node. |
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175 |
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176 @param node_id: NodeID of the desired node. |
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177 @type node_id: L{str} |
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178 @return: deferred that returns a L{Node} object. |
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179 """ |
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180 |
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181 def get_node_ids(): |
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182 """ |
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183 Return all NodeIDs. |
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184 |
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185 @return: deferred that returns a list of NodeIDs (L{str}). |
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186 """ |
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187 |
173
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167
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188 def create_node(node_id, owner, config=None): |
167
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189 """ |
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190 Create new node. |
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191 |
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192 The implementation should make sure, the passed owner JID is stripped |
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193 of the resource (e.g. using C{owner.userhostJID()}). |
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194 |
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195 @param node_id: NodeID of the new node. |
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196 @type node_id: L{str} |
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197 @param owner: JID of the new nodes's owner. |
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198 @type owner: L{jid.JID} |
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199 @param config: Configuration |
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200 @return: deferred that fires on creation. |
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201 """ |
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202 |
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203 def delete_node(node_id): |
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204 """ |
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205 Delete a node. |
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206 |
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207 @param node_id: NodeID of the new node. |
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208 @type node_id: L{str} |
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209 @return: deferred that fires on deletion. |
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210 """ |
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211 |
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212 def get_affiliations(entity): |
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213 """ |
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214 Get all affiliations for entity. |
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215 |
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216 The implementation should make sure, the passed owner JID is stripped |
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217 of the resource (e.g. using C{owner.userhostJID()}). |
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218 |
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219 @param entity: JID of the entity. |
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220 @type entity: L{jid.JID} |
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221 @return: deferred that returns a L{list} of tuples of the form |
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222 C{(node_id, affiliation)}, where C{node_id} is of the type |
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223 L{str} and C{affiliation} is one of C{'owner'}, C{'publisher'} |
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224 and C{'outcast'}. |
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225 """ |
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226 |
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227 def get_subscriptions(entity): |
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228 """ |
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229 Get all subscriptions for an entity. |
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230 |
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231 The implementation should make sure, the passed owner JID is stripped |
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232 of the resource (e.g. using C{owner.userhostJID()}). |
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233 |
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234 @param entity: JID of the entity. |
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235 @type entity: L{jid.JID} |
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236 @return: deferred that returns a L{list} of tuples of the form |
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237 C{(node_id, subscriber, state)}, where C{node_id} is of the |
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238 type L{str}, C{subscriber} of the type {jid.JID}, and |
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239 C{state} is C{'subscribed'} or C{'pending'}. |
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240 """ |
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241 |
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242 |
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243 class INode(Interface): |
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244 """ |
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245 Interface to the class of objects that represent nodes. |
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246 """ |
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247 |
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248 def get_type(): |
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249 """ |
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250 Get node's type. |
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251 |
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252 @return: C{'leaf'} or C{'collection'}. |
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253 """ |
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254 |
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255 def get_configuration(): |
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256 """ |
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257 Get node's configuration. |
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258 |
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259 The configuration must at least have two options: |
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260 C{pubsub#persist_items}, and C{pubsub#deliver_payloads}. |
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261 |
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262 @return: L{dict} of configuration options. |
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263 """ |
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264 |
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265 def get_meta_data(): |
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266 """ |
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267 Get node's meta data. |
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268 |
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269 The meta data must be a superset of the configuration options, and |
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270 also at least should have a C{pubsub#node_type} entry. |
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271 |
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272 @return: L{dict} of meta data. |
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273 """ |
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274 |
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275 def set_configuration(options): |
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276 """ |
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277 Set node's configuration. |
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278 |
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279 The elements of {options} will set the new values for those |
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280 configuration items. This means that only changing items have to |
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281 be given. |
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282 |
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283 @param options: a dictionary of configuration options. |
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284 @returns: a deferred that fires upon success. |
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285 """ |
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286 |
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287 def get_affiliation(entity): |
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288 """ |
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289 Get affiliation of entity with this node. |
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290 |
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291 @param entity: JID of entity. |
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292 @type entity: L{jid.JID} |
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293 @return: deferred that returns C{'owner'}, C{'publisher'}, C{'outcast'} |
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294 or C{None}. |
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295 """ |
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296 |
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297 def get_subscription(subscriber): |
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298 """ |
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299 Get subscription to this node of subscriber. |
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300 |
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301 @param subscriber: JID of the new subscriptions' entity. |
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302 @type subscriber: L{jid.JID} |
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303 @return: deferred that returns the subscription state (C{'subscribed'}, |
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304 C{'pending'} or C{None}). |
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305 """ |
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306 |
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307 def add_subscription(subscriber, state): |
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308 """ |
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309 Add new subscription to this node with given state. |
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310 |
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311 @param subscriber: JID of the new subscriptions' entity. |
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312 @type subscriber: L{jid.JID} |
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313 @param state: C{'subscribed'} or C{'pending'} |
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314 @type state: L{str} |
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315 @return: deferred that fires on subscription. |
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316 """ |
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317 |
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318 def remove_subscription(subscriber): |
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319 """ |
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320 Remove subscription to this node. |
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321 |
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322 @param subscriber: JID of the subscriptions' entity. |
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323 @type subscriber: L{jid.JID} |
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324 @return: deferred that fires on removal. |
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325 """ |
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326 |
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327 def get_subscribers(): |
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328 """ |
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329 Get list of subscribers to this node. |
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330 |
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331 Retrieves the list of entities that have a subscription to this |
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332 node. That is, having the state C{'subscribed'}. |
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333 |
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334 @return: a deferred that returns a L{list} of L{jid.JID}s. |
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335 """ |
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336 |
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337 def is_subscribed(entity): |
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338 """ |
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339 Returns whether entity has any subscription to this node. |
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340 |
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341 Only returns C{True} when the subscription state (if present) is |
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342 C{'subscribed'} for any subscription that matches the bare JID. |
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343 |
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344 @param subscriber: bare JID of the subscriptions' entity. |
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345 @type subscriber: L{jid.JID} |
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346 @return: deferred that returns a L{bool}. |
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347 """ |
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348 |
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349 def get_affiliations(): |
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350 """ |
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351 Get affiliations of entities with this node. |
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352 |
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353 @return: deferred that returns a L{list} of tuples (jid, affiliation), |
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354 where jid is a L(jid.JID) and affiliation is one of C{'owner'}, |
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355 C{'publisher'}, C{'outcast'}. |
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356 """ |
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357 |
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358 class ILeafNode(Interface): |
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359 """ |
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360 Interface to the class of objects that represent leaf nodes. |
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361 """ |
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362 |
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363 def store_items(items, publisher): |
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364 """ |
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365 Store items in persistent storage for later retrieval. |
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366 |
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367 @param items: The list of items to be stored. Each item is the |
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368 L{domish} representation of the XML fragment as defined |
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369 for C{<item/>} in the |
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370 C{http://jabber.org/protocol/pubsub} namespace. |
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371 @type items: L{list} of {domish.Element} |
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372 @param publisher: JID of the publishing entity. |
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373 @type publisher: L{jid.JID} |
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374 @return: deferred that fires upon success. |
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375 """ |
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376 |
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377 def remove_items(item_ids): |
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378 """ |
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379 Remove items by id. |
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380 |
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381 @param item_ids: L{list} of item ids. |
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382 @return: deferred that fires with a L{list} of ids of the items that |
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383 were deleted |
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384 """ |
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385 |
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386 def get_items(max_items=None): |
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387 """ |
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388 Get items. |
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389 |
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390 If C{max_items} is not given, all items in the node are returned, |
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391 just like C{get_items_by_id}. Otherwise, C{max_items} limits |
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392 the returned items to a maximum of that number of most recently |
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393 published items. |
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394 |
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395 @param max_items: if given, a natural number (>0) that limits the |
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396 returned number of items. |
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397 @return: deferred that fires with a L{list} of found items. |
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398 """ |
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399 |
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400 def get_items_by_id(item_ids): |
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401 """ |
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402 Get items by item id. |
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403 |
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404 Each item in the returned list is a unicode string that |
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405 represent the XML of the item as it was published, including the |
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406 item wrapper with item id. |
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407 |
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408 @param item_ids: L{list} of item ids. |
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409 @return: deferred that fires with a L{list} of found items. |
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410 """ |
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411 |
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412 def purge(): |
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413 """ |
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414 Purge node of all items in persistent storage. |
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415 |
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416 @return: deferred that fires when the node has been purged. |
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417 """ |