Mercurial > libervia-pubsub

annotate idavoll/backend.py @ 137:aca904a41a43

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Discover client_encoding parameter to pyPgSQL.
author Ralph Meijer <ralphm@ik.nu>
date Mon, 25 Apr 2005 12:58:59 +0000
parents 1c18759d2afb
children 753b8432460f
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1 from zope.interface import Interface
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2 import storage
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3
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4 class Error(Exception):
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5 msg = ''
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6
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7 def __str__(self):
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8 return self.msg
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9
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10 class NotAuthorized(Error):
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11 pass
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12
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13 class PayloadExpected(Error):
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14 msg = 'Payload expected'
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15
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16 class NoPayloadAllowed(Error):
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17 msg = 'No payload allowed'
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18
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19 class NoInstantNodes(Error):
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20 pass
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22 class NotImplemented(Error):
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23 pass
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24
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25 class NotSubscribed(Error):
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26 pass
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28 class InvalidConfigurationOption(Error):
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29 msg = 'Invalid configuration option'
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31 class InvalidConfigurationValue(Error):
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32 msg = 'Bad configuration value'
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33
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34 class IBackendService(Interface):
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35 """ Interface to a backend service of a pubsub service. """
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37 def __init__(self, storage):
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38 """
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39 @param storage: L{storage} object.
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40 """
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41
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42 def supports_publisher_affiliation(self):
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43 """ Reports if the backend supports the publisher affiliation.
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44
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45 @rtype: C{bool}
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46 """
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47
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48 def supports_outcast_affiliation(self):
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49 """ Reports if the backend supports the publisher affiliation.
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50
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51 @rtype: C{bool}
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52 """
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53
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54 def supports_persistent_items(self):
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55 """ Reports if the backend supports persistent items.
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57 @rtype: C{bool}
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58 """
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59
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60 def get_node_type(self, node_id):
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61 """ Return type of a node.
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62
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63 @return: a deferred that returns either 'leaf' or 'collection'
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64 """
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65
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66 def get_nodes(self):
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67 """ Returns list of all nodes.
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68
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69 @return: a deferred that returns a C{list} of node ids.
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70 """
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71
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72 def get_node_meta_data(self, node_id):
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73 """ Return meta data for a node.
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74
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75 @return: a deferred that returns a C{list} of C{dict}s with the
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76 metadata.
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77 """
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78
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79 class INodeCreationService(Interface):
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80 """ A service for creating nodes """
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81
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82 def create_node(self, node_id, requestor):
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83 """ Create a node.
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84
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85 @return: a deferred that fires when the node has been created.
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86 """
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87
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88 class INodeDeletionService(Interface):
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89 """ A service for deleting nodes. """
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90
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91 def register_pre_delete(self, pre_delete_fn):
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92 """ Register a callback that is called just before a node deletion.
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93
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94 The function C{pre_deleted_fn} is added to a list of functions
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95 to be called just before deletion of a node. The callback
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96 C{pre_delete_fn} is called with the C{node_id} that is about to be
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97 deleted and should return a deferred that returns a list of deferreds
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98 that are to be fired after deletion. The backend collects the lists
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99 from all these callbacks before actually deleting the node in question.
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100 After deletion all collected deferreds are fired to do post-processing.
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101
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102 The idea is that you want to be able to collect data from the
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103 node before deleting it, for example to get a list of subscribers
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104 that have to be notified after the node has been deleted. To do this,
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105 C{pre_delete_fn} fetches the subscriber list and passes this
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106 list to a callback attached to a deferred that it sets up. This
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107 deferred is returned in the list of deferreds.
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108 """
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109
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110 def get_subscribers(self, node_id):
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111 """ Get node subscriber list.
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112
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113 @return: a deferred that fires with the list of subscribers.
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114 """
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115
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116 def delete_node(self, node_id, requestor):
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117 """ Delete a node.
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118
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119 @return: a deferred that fires when the node has been deleted.
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120 """
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121
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122 class IPublishService(Interface):
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123 """ A service for publishing items to a node. """
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124
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125 def publish(self, node_id, items, requestor):
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126 """ Publish items to a pubsub node.
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127
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128 @return: a deferred that fires when the items have been published.
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129 """
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130 class INotificationService(Interface):
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131 """ A service for notification of published items. """
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132
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133 def register_notifier(self, observerfn, *args, **kwargs):
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134 """ Register callback which is called for notification. """
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135
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136 def get_notification_list(self, node_id, items):
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137 pass
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138
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139 class ISubscriptionService(Interface):
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140 """ A service for managing subscriptions. """
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141
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142 def subscribe(self, node_id, subscriber, requestor):
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143 """ Request the subscription of an entity to a pubsub node.
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144
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145 Depending on the node's configuration and possible business rules, the
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146 C{subscriber} is added to the list of subscriptions of the node with id
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147 C{node_id}. The C{subscriber} might be different from the C{requestor},
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148 and if the C{requestor} is not allowed to subscribe this entity an
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149 exception should be raised.
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150
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151 @return: a deferred that returns the subscription state
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152 """
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153
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154 def unsubscribe(self, node_id, subscriber, requestor):
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155 """ Cancel the subscription of an entity to a pubsub node.
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156
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157 The subscription of C{subscriber} is removed from the list of
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158 subscriptions of the node with id C{node_id}. If the C{requestor}
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159 is not allowed to unsubscribe C{subscriber}, an an exception should
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160 be raised.
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161
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162 @return: a deferred that fires when unsubscription is complete.
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163 """
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164
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165 class IAffiliationsService(Interface):
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166 """ A service for retrieving the affiliations with this pubsub service. """
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167
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168 def get_affiliations(self, entity):
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169 """ Report the list of current affiliations with this pubsub service.
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170
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171 Report the list of the current affiliations with all nodes within this
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172 pubsub service, along with subscriptions to such nodes, for the
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173 C{entity}.
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174
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175 @return: a deferred that returns the list of all current affiliations
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176 and subscriptions.
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177 """
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178
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179 class IRetractionService(Interface):
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180 """ A service for retracting published items """
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181
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182 def retract_item(self, node_id, item_id, requestor):
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183 """ Removes item in node from persistent storage """
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184
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185 def purge_node(self, node_id, requestor):
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186 """ Removes all items in node from persistent storage """
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187
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188 class IItemRetrievalService(Interface):
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189 """ A service for retrieving previously published items. """
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190
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191 def get_items(self, node_id, requestor, max_items=None, item_ids=[]):
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192 """ Retrieve items from persistent storage
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193
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194 If C{max_items} is given, return the C{max_items} last published
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195 items, else if C{item_ids} is not empty, return the items requested.
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196 If neither is given, return all items.
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197
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198 @return: a deferred that returns the requested items
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199 """