org.apache.druid.query.aggregation

Class SerializablePairLongStringSerde

java.lang.Object

org.apache.druid.segment.serde.ComplexMetricSerde

org.apache.druid.query.aggregation.SerializablePairLongStringSerde

public class SerializablePairLongStringSerde
extends ComplexMetricSerde

The SerializablePairLongStringSerde serializes a Long-String pair (SerializablePairLongString). The serialization structure is: Long:Integer:String

The class is used on first/last String aggregators to store the time and the first/last string. Long:Integer:String -> Timestamp:StringSize:StringData

Constructor Summary

Constructors

Constructor and Description
SerializablePairLongStringSerde()

Method Summary

Modifier and Type	Method and Description
void	deserializeColumn(ByteBuffer buffer, ColumnBuilder columnBuilder) Deserializes a ByteBuffer and adds it to the ColumnBuilder.
ComplexMetricExtractor	getExtractor()
ObjectStrategy	getObjectStrategy() This is deprecated because its usage is going to be removed from the code.
GenericColumnSerializer	getSerializer(SegmentWriteOutMedium segmentWriteOutMedium, String column) This method provides the ability for a ComplexMetricSerde to control its own serialization.
String	getTypeName()

Methods inherited from class org.apache.druid.segment.serde.ComplexMetricSerde

fromBytes, inputSizeFn, toBytes

Methods inherited from class java.lang.Object

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

Constructor Detail

SerializablePairLongStringSerde

public SerializablePairLongStringSerde()

Method Detail

getTypeName

public String getTypeName()

Specified by:

getTypeName in class ComplexMetricSerde

getExtractor

public ComplexMetricExtractor getExtractor()

Specified by:

getExtractor in class ComplexMetricSerde

deserializeColumn

public void deserializeColumn(ByteBuffer buffer,
                              ColumnBuilder columnBuilder)

Description copied from class: ComplexMetricSerde

Deserializes a ByteBuffer and adds it to the ColumnBuilder. This method allows for the ComplexMetricSerde to implement it's own versioning scheme to allow for changes of binary format in a forward-compatible manner.

Specified by:

deserializeColumn in class ComplexMetricSerde

Parameters:

buffer - the buffer to deserialize

columnBuilder - ColumnBuilder to add the column to

getObjectStrategy

public ObjectStrategy getObjectStrategy()

Description copied from class: ComplexMetricSerde

This is deprecated because its usage is going to be removed from the code.

It was introduced before deserializeColumn() existed. This method creates the assumption that Druid knows how to interpret the actual column representation of the data, but I would much prefer that the ComplexMetricSerde objects be in charge of creating and interpreting the whole column, which is what deserializeColumn lets them do.

Specified by:

getObjectStrategy in class ComplexMetricSerde

Returns:

an ObjectStrategy as used by GenericIndexed

getSerializer

public GenericColumnSerializer getSerializer(SegmentWriteOutMedium segmentWriteOutMedium,
                                             String column)

Description copied from class: ComplexMetricSerde

This method provides the ability for a ComplexMetricSerde to control its own serialization. For large column (i.e columns greater than Integer.MAX_VALUE) use LargeColumnSupportedComplexColumnSerializer

Overrides:

getSerializer in class ComplexMetricSerde

Returns:

an instance of GenericColumnSerializer used for serialization.