Package org.apache.beam.sdk.io.gcp.spanner.changestreams.action

Class ActionFactory

java.lang.Object

org.apache.beam.sdk.io.gcp.spanner.changestreams.action.ActionFactory

All Implemented Interfaces:

java.io.Serializable

public class ActionFactory
extends java.lang.Object
implements java.io.Serializable

Factory class for creating instances that will handle each type of record within a change stream query. The instances created are all singletons.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ActionFactory()

Method Summary

Modifier and Type	Method	Description
ChildPartitionsRecordAction	childPartitionsRecordAction(PartitionMetadataDao partitionMetadataDao, ChangeStreamMetrics metrics)	Creates and returns a singleton instance of an action class capable of process ChildPartitionsRecords.
DataChangeRecordAction	dataChangeRecordAction(ThroughputEstimator<DataChangeRecord> throughputEstimator)	Creates and returns a singleton instance of an action class capable of processing DataChangeRecords.
DetectNewPartitionsAction	detectNewPartitionsAction(PartitionMetadataDao partitionMetadataDao, PartitionMetadataMapper partitionMetadataMapper, ChangeStreamMetrics metrics, org.joda.time.Duration resumeDuration)	Creates and returns a single instance of an action class capable of detecting and scheduling new partitions to be queried.
HeartbeatRecordAction	heartbeatRecordAction(ChangeStreamMetrics metrics)	Creates and returns a singleton instance of an action class capable of processing HeartbeatRecords.
QueryChangeStreamAction	queryChangeStreamAction(ChangeStreamDao changeStreamDao, PartitionMetadataDao partitionMetadataDao, ChangeStreamRecordMapper changeStreamRecordMapper, PartitionMetadataMapper partitionMetadataMapper, DataChangeRecordAction dataChangeRecordAction, HeartbeatRecordAction heartbeatRecordAction, ChildPartitionsRecordAction childPartitionsRecordAction, ChangeStreamMetrics metrics)	Creates and returns a single instance of an action class capable of performing a change stream query for a given partition.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ActionFactory

public ActionFactory()

Method Detail

dataChangeRecordAction

public DataChangeRecordAction dataChangeRecordAction(ThroughputEstimator<DataChangeRecord> throughputEstimator)

Creates and returns a singleton instance of an action class capable of processing DataChangeRecords.

This method is thread safe.

Returns:

singleton instance of the DataChangeRecordAction

heartbeatRecordAction

public HeartbeatRecordAction heartbeatRecordAction(ChangeStreamMetrics metrics)

Creates and returns a singleton instance of an action class capable of processing HeartbeatRecords. This method is thread safe.

Parameters:

metrics - metrics gathering class

Returns:

singleton instance of the HeartbeatRecordAction

childPartitionsRecordAction

public ChildPartitionsRecordAction childPartitionsRecordAction(PartitionMetadataDao partitionMetadataDao,
                                                               ChangeStreamMetrics metrics)

Creates and returns a singleton instance of an action class capable of process ChildPartitionsRecords. This method is thread safe.

Parameters:

partitionMetadataDao - DAO class to access the Connector's metadata tables

metrics - metrics gathering class

Returns:

singleton instance of the ChildPartitionsRecordAction

queryChangeStreamAction

public QueryChangeStreamAction queryChangeStreamAction(ChangeStreamDao changeStreamDao,
                                                       PartitionMetadataDao partitionMetadataDao,
                                                       ChangeStreamRecordMapper changeStreamRecordMapper,
                                                       PartitionMetadataMapper partitionMetadataMapper,
                                                       DataChangeRecordAction dataChangeRecordAction,
                                                       HeartbeatRecordAction heartbeatRecordAction,
                                                       ChildPartitionsRecordAction childPartitionsRecordAction,
                                                       ChangeStreamMetrics metrics)

Creates and returns a single instance of an action class capable of performing a change stream query for a given partition. It uses the DataChangeRecordAction, HeartbeatRecordAction and ChildPartitionsRecordAction to dispatch the necessary processing depending on the type of record received.

Parameters:

changeStreamDao - DAO class to perform a change stream query

partitionMetadataDao - DAO class to access the Connector's metadata tables

changeStreamRecordMapper - mapper class to transform change stream records into the Connector's domain models

partitionMetadataMapper - mapper class to transform partition metadata rows into the Connector's domain models

dataChangeRecordAction - action class to process DataChangeRecords

heartbeatRecordAction - action class to process HeartbeatRecords

childPartitionsRecordAction - action class to process ChildPartitionsRecords

metrics - metrics gathering class

Returns:

single instance of the QueryChangeStreamAction

detectNewPartitionsAction

public DetectNewPartitionsAction detectNewPartitionsAction(PartitionMetadataDao partitionMetadataDao,
                                                           PartitionMetadataMapper partitionMetadataMapper,
                                                           ChangeStreamMetrics metrics,
                                                           org.joda.time.Duration resumeDuration)

Creates and returns a single instance of an action class capable of detecting and scheduling new partitions to be queried.

Parameters:

partitionMetadataDao - DAO class to access the Connector's metadata tables

partitionMetadataMapper - mapper class to transform partition metadata table rows into the Connector's domain models

metrics - metrics gathering class

resumeDuration - specifies the periodic schedule to re-execute the action

Returns:

single instance of the DetectNewPartitionsAction