org.apache.beam.sdk.io.gcp.spanner.changestreams.mapper

Class PartitionMetadataMapper

java.lang.Object

org.apache.beam.sdk.io.gcp.spanner.changestreams.mapper.PartitionMetadataMapper

public class PartitionMetadataMapper
extends java.lang.Object

This class is responsible for transforming a Struct to a PartitionMetadata.

Method Summary

Modifier and Type	Method and Description
PartitionMetadata	from(com.google.cloud.spanner.Struct row) Transforms a Struct representing a partition metadata row into a PartitionMetadata model.

Methods inherited from class java.lang.Object

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

Method Detail

from

public PartitionMetadata from(com.google.cloud.spanner.Struct row)

Transforms a Struct representing a partition metadata row into a PartitionMetadata model. The Struct is expected to have the following fields:

• PartitionMetadataAdminDao.COLUMN_PARTITION_TOKEN: non-nullable String representing the partition unique identifier.
• PartitionMetadataAdminDao.COLUMN_PARENT_TOKENS: non-nullable List of String representing the partition parents' unique identifiers.
• PartitionMetadataAdminDao.COLUMN_START_TIMESTAMP: non-nullable Timestamp representing the start time at which the partition started existing in Cloud Spanner.
• PartitionMetadataAdminDao.COLUMN_END_TIMESTAMP: non-nullable Timestamp representing the end time for querying this partition.
• PartitionMetadataAdminDao.COLUMN_HEARTBEAT_MILLIS: non-nullable Long representing the number of milliseconds after the stream is idle, which a heartbeat record will be emitted.
• PartitionMetadataAdminDao.COLUMN_STATE: non-nullable String representing the PartitionMetadata.State in which the partition is in.
• PartitionMetadataAdminDao.COLUMN_WATERMARK: non-nullable Timestamp representing the time for which all records with a timestamp less than it have been processed.
• PartitionMetadataAdminDao.COLUMN_CREATED_AT: non-nullable Timestamp representing the time at which this partition was first detected.
• PartitionMetadataAdminDao.COLUMN_SCHEDULED_AT: nullable Timestamp representing the time at which this partition was scheduled to be queried.
• PartitionMetadataAdminDao.COLUMN_RUNNING_AT: nullable Timestamp representing the time at which the connector started processing this partition.
• PartitionMetadataAdminDao.COLUMN_FINISHED_AT: nullable Timestamp representing the time at which the connector finished processing this partition.

Parameters:

row - the Struct row to be converted. It should contain all the fields as specified above.

Returns:

a PartitionMetadata with the mapped Struct field values.