com.hazelcast.map.impl

Class LazyMapEntry<K,V>

java.lang.Object

com.hazelcast.query.impl.QueryableEntry<K,V>

com.hazelcast.query.impl.CachedQueryEntry<K,V>

com.hazelcast.map.impl.LazyMapEntry<K,V>

Type Parameters:

K - key

V - value

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, Extractable, Serializable, Map.Entry<K,V>

Direct Known Subclasses:

LockAwareLazyMapEntry

public class LazyMapEntry<K,V>
extends CachedQueryEntry<K,V>
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:

EntryOperator.createMapEntry(Data, Object, Boolean), 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	hasNullValue() Checks if this entry has null value without any deserialization.
boolean	isModified()
void	readData(ObjectDataInput in) Reads fields from the input stream
void	remove() Similar to calling setValue(V) with null but doesn't return old-value hence no extra deserialization.
V	setValue(V 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

extractAttributeType, getAttributeValue, getMetadata, setMetadata

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 V setValue(V value)

Specified by:

setValue in interface Map.Entry<K,V>

Overrides:

setValue in class CachedQueryEntry<K,V>

remove

public void remove()

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

hasNullValue

public boolean hasNullValue()

Checks if this entry has null value without any deserialization.

Returns:

true if value is null, otherwise returns false.

isModified

public boolean isModified()

equals

public boolean equals(Object o)

Specified by:

equals in interface Map.Entry<K,V>

Overrides:

equals in class CachedQueryEntry<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map.Entry<K,V>

Overrides:

hashCode in class CachedQueryEntry<K,V>

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 - if an I/O error occurs. In particular, an IOException may be thrown if the input stream has been closed.

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 - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

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. It should be unique per DataSerializableFactory.

Specified by:

getId in interface IdentifiedDataSerializable

Returns:

type ID