@Internal public class MapDataSerializer extends TypeSerializer<MapData>
MapData
.Modifier and Type | Class and Description |
---|---|
static class |
MapDataSerializer.MapDataSerializerSnapshot
|
Constructor and Description |
---|
MapDataSerializer(LogicalType keyType,
LogicalType valueType) |
Modifier and Type | Method and Description |
---|---|
void |
copy(DataInputView source,
DataOutputView target)
Copies exactly one record from the source input view to the target output view.
|
MapData |
copy(MapData from)
NOTE: Map should be a HashMap, when we insert the key/value pairs of the TreeMap into a
HashMap, problems maybe occur.
|
MapData |
copy(MapData from,
MapData reuse)
Creates a copy from the given element.
|
MapData |
createInstance()
Creates a new instance of the data type.
|
MapData |
deserialize(DataInputView source)
De-serializes a record from the given source input view.
|
MapData |
deserialize(MapData reuse,
DataInputView source)
De-serializes a record from the given source input view into the given reuse record instance
if mutable.
|
TypeSerializer<MapData> |
duplicate()
Creates a deep copy of this serializer if it is necessary, i.e. if it is stateful.
|
boolean |
equals(Object o) |
TypeSerializer |
getKeySerializer() |
int |
getLength()
Gets the length of the data type, if it is a fix length data type.
|
TypeSerializer |
getValueSerializer() |
int |
hashCode() |
boolean |
isImmutableType()
Gets whether the type is an immutable type.
|
void |
serialize(MapData record,
DataOutputView target)
Serializes the given record to the given target output view.
|
TypeSerializerSnapshot<MapData> |
snapshotConfiguration()
Snapshots the configuration of this TypeSerializer.
|
BinaryMapData |
toBinaryMap(MapData from) |
public MapDataSerializer(LogicalType keyType, LogicalType valueType)
public boolean isImmutableType()
TypeSerializer
isImmutableType
in class TypeSerializer<MapData>
public TypeSerializer<MapData> duplicate()
TypeSerializer
We need this because Serializers might be used in several threads. Stateless serializers are inherently thread-safe while stateful serializers might not be thread-safe.
duplicate
in class TypeSerializer<MapData>
public MapData createInstance()
TypeSerializer
createInstance
in class TypeSerializer<MapData>
public MapData copy(MapData from)
copy
in class TypeSerializer<MapData>
from
- The element reuse be copied.public MapData copy(MapData from, MapData reuse)
TypeSerializer
copy
in class TypeSerializer<MapData>
from
- The element to be copied.reuse
- The element to be reused. May or may not be used.public int getLength()
TypeSerializer
getLength
in class TypeSerializer<MapData>
-1
for variable length data types.public void serialize(MapData record, DataOutputView target) throws IOException
TypeSerializer
serialize
in class TypeSerializer<MapData>
record
- The record to serialize.target
- The output view to write the serialized data to.IOException
- Thrown, if the serialization encountered an I/O related error. Typically
raised by the output view, which may have an underlying I/O channel to which it
delegates.public BinaryMapData toBinaryMap(MapData from)
public MapData deserialize(DataInputView source) throws IOException
TypeSerializer
deserialize
in class TypeSerializer<MapData>
source
- The input view from which to read the data.IOException
- Thrown, if the de-serialization encountered an I/O related error.
Typically raised by the input view, which may have an underlying I/O channel from which
it reads.public MapData deserialize(MapData reuse, DataInputView source) throws IOException
TypeSerializer
deserialize
in class TypeSerializer<MapData>
reuse
- The record instance into which to de-serialize the data.source
- The input view from which to read the data.IOException
- Thrown, if the de-serialization encountered an I/O related error.
Typically raised by the input view, which may have an underlying I/O channel from which
it reads.public void copy(DataInputView source, DataOutputView target) throws IOException
TypeSerializer
target.write(source, 8);
.copy
in class TypeSerializer<MapData>
source
- The input view from which to read the record.target
- The target output view to which to write the record.IOException
- Thrown if any of the two views raises an exception.public boolean equals(Object o)
equals
in class TypeSerializer<MapData>
public int hashCode()
hashCode
in class TypeSerializer<MapData>
@VisibleForTesting public TypeSerializer getKeySerializer()
@VisibleForTesting public TypeSerializer getValueSerializer()
public TypeSerializerSnapshot<MapData> snapshotConfiguration()
TypeSerializer
The snapshot of the TypeSerializer is supposed to contain all information that affects the serialization format of the serializer. The snapshot serves two purposes: First, to reproduce the serializer when the checkpoint/savepoint is restored, and second, to check whether the serialization format is compatible with the serializer used in the restored program.
IMPORTANT: TypeSerializerSnapshots changed after Flink 1.6. Serializers implemented against Flink versions up to 1.6 should still work, but adjust to new model to enable state evolution and be future-proof. See the class-level comments, section "Upgrading TypeSerializers to the new TypeSerializerSnapshot model" for details.
snapshotConfiguration
in class TypeSerializer<MapData>
null
).TypeSerializerSnapshot.resolveSchemaCompatibility(TypeSerializer)
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