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annotate idavoll/backend.py @ 29:d4fc29bb5381

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Define interfaces of blocks of functionality.
author Ralph Meijer <ralphm@ik.nu>
date Tue, 26 Oct 2004 16:25:59 +0000
parents 4f3bbefc6fad
children b65b7ea5c992
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1 from twisted.python import components
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2 from twisted.application import service
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3 from twisted.xish import utility
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5 class Error(Exception):
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6 msg = ''
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7
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8 def __str__(self):
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9 return self.msg
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10
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11 class NodeNotFound(Error):
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12 msg = 'Node not found'
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14 class NotAuthorized(Error):
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15 pass
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eddea65d1032 Added two exceptions: NoInstantNodes and NodeExists.
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17 class PayloadExpected(Error):
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18 msg = 'Payload expected'
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19
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20 class NoPayloadAllowed(Error):
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21 msg = 'No payload allowed'
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23 class NoInstantNodes(Error):
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24 pass
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884268687229 Simplify call chain by mapping incoming requests directly to method
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26 class NodeExists(Error):
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27 pass
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29 class NotImplemented(Error):
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30 msg = 'Oops!'
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31
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32 class IBackendService(components.Interface):
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33 """ Interface to a backend service of a pubsub service. """
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34
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35 def get_supported_affiliations(self):
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36 """ Reports the list of supported affiliation types.
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37
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38 @return: a list of supported affiliation types.
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39 """
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40
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41 class INodeCreationService(components.Interface):
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42 """ A service for creating nodes """
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43
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44 def create_node(self, node_id, requestor):
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45 """ Create a node.
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46
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47 @return: a deferred that fires when the node has been created.
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48 """
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49
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50 class IPublishService(components.Interface):
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51 """ A service for publishing items to a node. """
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52
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53 def publish(self, node_id, items, requestor):
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54 """ Publish items to a pubsub node.
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55
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56 @return: a deferred that fires when the items have been published.
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57 """
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58 class INotificationService(components.Interface):
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59 """ A service for notification of published items. """
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60
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61 def register_notifier(self, observerfn, *args, **kwargs):
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62 """ Register callback which is called for notification. """
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63
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64 def get_notification_list(self, node_id, items):
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65 pass
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66
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67 class ISubscriptionService(components.Interface):
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68 """ A service for managing subscriptions. """
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69
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70 def subscribe(self, node_id, subscriber, requestor):
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71 """ Request the subscription of an entity to a pubsub node.
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72
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73 Depending on the node's configuration and possible business rules, the
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74 C{subscriber} is added to the list of subscriptions of the node with id
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75 C{node_id}. The C{subscriber} might be different from the C{requestor},
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76 and if the C{requestor} is not allowed to subscribe this entity an
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77 exception should be raised.
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78
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79 @return: a deferred that returns the subscription state
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80 """
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81
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82 def unsubscribe(self, node_id, subscriber, requestor):
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83 """ Cancel the subscription of an entity to a pubsub node.
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84
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85 The subscription of C{subscriber} is removed from the list of
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86 subscriptions of the node with id C{node_id}. If the C{requestor}
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87 is not allowed to unsubscribe C{subscriber}, an an exception should
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88 be raised.
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89
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90 @return: a deferred that fires when unsubscription is complete.
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91 """
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92
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93 class IAffiliationsService(components.Interface):
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94 """ A service for retrieving the affiliations with this pubsub service. """
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95
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96 def get_affiliations(self, entity):
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97 """ Report the list of current affiliations with this pubsub service.
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98
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99 Report the list of the current affiliations with all nodes within this
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100 pubsub service, along with subscriptions to such nodes, for the
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101 C{entity}.
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102
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103 @return: a deferred that returns the list of all current affiliations
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104 and subscriptions.
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105 """
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106
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107 class IPersistenceService(components.Interface):
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108 """ A service for persisting published items """
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109
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110 def store_items(self, node_id, items, publisher):
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111 """ Store items for a node, recording the publisher """
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112
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113 class IRetractionService(components.Interface):
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114 """ A service for retracting published items """
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115
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116 def retract_item(self, node_id, item_id, requestor):
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117 """ Removes item in node from persistent storage """
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118
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119 def purge_node(self, node_id, requestor):
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120 """ Removes all items in node from persistent storage """
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121
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122 class IItemRetrievalService(components.Interface):
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123 """ A service for retrieving previously published items. """
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124
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125 def get_items(self, node_id, max_items=None, item_ids=[],
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126 requestor=None):
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127 """ Retrieve items from persistent storage
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128
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129 If C{max_items} is given, return the C{max_items} last published
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130 items, else if C{item_ids} is not empty, return the items requested.
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131 If neither is given, return all items.
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132
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133 @return: a deferred that returns the requested items
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134 """
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135
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136 class BackendService(service.MultiService, utility.EventDispatcher):
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137
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138 __implements__ = IBackendService,
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139
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140 def __init__(self):
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141 service.MultiService.__init__(self)
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142 utility.EventDispatcher.__init__(self)
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143
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144 class NotificationService(service.Service):
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145
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146 def register_notifier(self, observerfn, *args, **kwargs):
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147 self.parent.addObserver('//event/pubsub/notify', observerfn,
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148 *args, **kwargs)