Public Member Functions | |
| def | new_historized_event |
| def | new_historized_node |
| def | read_event_history |
| def | read_node_history |
| def | save_event |
| def | save_node_value |
| def | stop |
Detailed Description
Interface of a history backend. Must be implemented by backends
Definition at line 14 of file history.py.
Member Function Documentation
| def opcua.server.history.HistoryStorageInterface.new_historized_event | ( | self, | |
| source_id, | |||
| evtypes, | |||
| period, | |||
count = 0 |
|||
| ) |
Called when historization of events is enabled on server side Returns None
Reimplemented in opcua.server.history_sql.HistorySQLite, and opcua.server.history.HistoryDict.
Definition at line 46 of file history.py.
| def opcua.server.history.HistoryStorageInterface.new_historized_node | ( | self, | |
| node_id, | |||
| period, | |||
count = 0 |
|||
| ) |
Called when a new node is to be historized Returns None
Reimplemented in opcua.server.history.HistoryDict, and opcua.server.history_sql.HistorySQLite.
Definition at line 21 of file history.py.
| def opcua.server.history.HistoryStorageInterface.read_event_history | ( | self, | |
| source_id, | |||
| start, | |||
| end, | |||
| nb_values, | |||
| evfilter | |||
| ) |
Called when a client make a history read request for events Start time and end time are inclusive Returns a list of Events and a continuation point which is None if all events are read or the ServerTimeStamp of the last rejected event
Reimplemented in opcua.server.history_sql.HistorySQLite, and opcua.server.history.HistoryDict.
Definition at line 60 of file history.py.
| def opcua.server.history.HistoryStorageInterface.read_node_history | ( | self, | |
| node_id, | |||
| start, | |||
| end, | |||
| nb_values | |||
| ) |
Called when a client make a history read request for a node if start or end is missing then nb_values is used to limit query nb_values is the max number of values to read. Ignored if 0 Start time and end time are inclusive Returns a list of DataValues and a continuation point which is None if all nodes are read or the ServerTimeStamp of the last rejected DataValue
Reimplemented in opcua.server.history.HistoryDict, and opcua.server.history_sql.HistorySQLite.
Definition at line 35 of file history.py.
| def opcua.server.history.HistoryStorageInterface.save_event | ( | self, | |
| event | |||
| ) |
Called when a new event has been generated ans should be saved in history Returns None
Reimplemented in opcua.server.history_sql.HistorySQLite, and opcua.server.history.HistoryDict.
Definition at line 53 of file history.py.
| def opcua.server.history.HistoryStorageInterface.save_node_value | ( | self, | |
| node_id, | |||
| datavalue | |||
| ) |
Called when the value of a historized node has changed and should be saved in history Returns None
Reimplemented in opcua.server.history.HistoryDict, and opcua.server.history_sql.HistorySQLite.
Definition at line 28 of file history.py.
Called when the server shuts down Can be used to close database connections etc.
Reimplemented in opcua.server.history_sql.HistorySQLite, and opcua.server.history.HistoryDict.
Definition at line 69 of file history.py.
The documentation for this class was generated from the following file: