cdc

superduperdb.cdc.cdc

Source code

DatabaseChangeDataCapture

DatabaseChangeDataCapture(self,
     db: 'Datalayer')

Parameter	Description
db	A superduperdb datalayer instance.

DatabaseChangeDataCapture (CDC).

DatabaseChangeDataCapture is a Python class that provides a flexible and extensible framework for capturing and managing data changes in a database.

This class is repsonsible for cdc service on the provided db instance This class is designed to simplify the process of tracking changes to database records,allowing you to monitor and respond to data modifications efficiently.

BaseDatabaseListener

BaseDatabaseListener(self,
     db: 'Datalayer',
     on: Union[ForwardRef('IbisQuery'),
     ForwardRef('TableOrCollection')],
     stop_event: superduperdb.misc.runnable.runnable.Event,
     identifier: 'str' = '',
     timeout: Optional[float] = None)

Parameter	Description
db	A superduperdb instance.
on	A table or collection on which the listener is invoked.
stop_event	A threading event flag to notify for stoppage.
identifier	A identity given to the listener service.
timeout	A timeout for the listener.

A Base class which defines basic functions to implement.

This class is responsible for defining the basic functions that needs to be implemented by the database listener.

CDCHandler

CDCHandler(self,
     db: 'Datalayer',
     stop_event: superduperdb.misc.runnable.runnable.Event,
     queue)

Parameter	Description
db	A superduperdb instance.
stop_event	A threading event flag to notify for stoppage.
queue	A queue to hold the cdc packets.

CDCHandler for handling CDC changes.

This class is responsible for handling the change by executing the taskflow. This class also extends the task graph by adding funcation job node which does post model executiong jobs, i.e copy_vectors.

DatabaseListenerFactory

DatabaseListenerFactory(self,
     db_type: str = 'mongodb')

Parameter	Description
db_type	Database type.

DatabaseListenerFactory to create listeners for different databases.

This class is responsible for creating a DatabaseListener instance based on the database type.

DatabaseListenerThreadScheduler

DatabaseListenerThreadScheduler(self,
     listener: superduperdb.cdc.cdc.BaseDatabaseListener,
     stop_event: superduperdb.misc.runnable.runnable.Event,
     start_event: superduperdb.misc.runnable.runnable.Event) -> None

Parameter	Description
listener	A BaseDatabaseListener instance.
stop_event	A threading event flag to notify for stoppage.
start_event	A threading event flag to notify for start.

DatabaseListenerThreadScheduler to listen to the cdc changes.

This class is responsible for listening to the cdc changes and executing the following job.

Packet

Packet(self,
     ids: Any,
     query: Optional[Any] = None,
     event_type: superduperdb.cdc.cdc.DBEvent = <DBEvent.insert: 'insert'>) -> None

Parameter	Description
ids	Document ids.
query	Query to fetch the document.
event_type	CDC event type.

Packet to hold the cdc event data.