com.hazelcast.map.impl

Class LazyMapEntry

java.lang.Object

com.hazelcast.query.impl.QueryableEntry

com.hazelcast.query.impl.CachedQueryEntry

com.hazelcast.map.impl.LazyMapEntry

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, Extractable, Serializable, Map.Entry

public class LazyMapEntry
extends CachedQueryEntry
implements Serializable, IdentifiedDataSerializable

A Map.Entry implementation which serializes/de-serializes key and value objects on demand. It is beneficial when you need to prevent unneeded serialization/de-serialization when creating a Map.Entry. Mainly targeted to supply a lazy entry to EntryProcessor.process(Map.Entry) and EntryBackupProcessor.processBackup(Map.Entry)} methods.

Note that this implementation is not synchronized and is not thread-safe.

LazyMapEntry itself is serializable as long as the object representations of both key and value are serializable. After serialization objects are resolved using injected SerializationService. De-serialized LazyMapEntry does contain object representation only Data representations and SerializationService is set to null. In other words: It's as usable just as a regular Map.Entry.

See Also:

MutatingKeyBasedMapOperation.createMapEntry(Data, Object), Serialized Form

Field Summary

Fields inherited from class com.hazelcast.query.impl.CachedQueryEntry

keyData, keyObject, valueData, valueObject

Fields inherited from class com.hazelcast.query.impl.QueryableEntry

extractors, serializationService

Constructor Summary

Constructors

Constructor and Description
LazyMapEntry()
LazyMapEntry(Data key, Object value, InternalSerializationService serializationService)
LazyMapEntry(Data key, Object value, InternalSerializationService serializationService, Extractors extractors)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
int	getFactoryId() Returns DataSerializableFactory factory id for this class.
int	getId() Returns type identifier for this class.
int	hashCode()
boolean	isModified()
void	readData(ObjectDataInput in) Reads fields from the input stream
void	remove() Similar to calling setValue(java.lang.Object) with null but doesn't return old-value hence no extra deserialization.
Object	setValue(Object value)
String	toString()
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class com.hazelcast.query.impl.CachedQueryEntry

getKey, getKeyData, getTargetObject, getValue, getValueData, init

Methods inherited from class com.hazelcast.query.impl.QueryableEntry

getAttributeType, getAttributeValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map.Entry

comparingByKey, comparingByKey, comparingByValue, comparingByValue

Constructor Detail

LazyMapEntry

public LazyMapEntry()

LazyMapEntry

public LazyMapEntry(Data key,
                    Object value,
                    InternalSerializationService serializationService)

LazyMapEntry

public LazyMapEntry(Data key,
                    Object value,
                    InternalSerializationService serializationService,
                    Extractors extractors)

Method Detail

setValue

public Object setValue(Object value)

Specified by:

setValue in interface Map.Entry

Overrides:

setValue in class CachedQueryEntry

remove

public void remove()

Similar to calling setValue(java.lang.Object) with null but doesn't return old-value hence no extra deserialization.

isModified

public boolean isModified()

equals

public boolean equals(Object o)

Specified by:

equals in interface Map.Entry

Overrides:

equals in class CachedQueryEntry

hashCode

public int hashCode()

Specified by:

hashCode in interface Map.Entry

Overrides:

hashCode in class CachedQueryEntry

toString

public String toString()

Overrides:

toString in class Object

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException

getFactoryId

public int getFactoryId()

Description copied from interface: IdentifiedDataSerializable

Returns DataSerializableFactory factory id for this class.

Specified by:

getFactoryId in interface IdentifiedDataSerializable

Returns:

factory id

getId

public int getId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. Id should be unique per DataSerializableFactory.

Specified by:

getId in interface IdentifiedDataSerializable

Returns:

type id