com.hazelcast.map.eviction

Class LFUEvictionPolicy

java.lang.Object

com.hazelcast.map.eviction.MapEvictionPolicy

com.hazelcast.map.eviction.LFUEvictionPolicy

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, Comparator

public class LFUEvictionPolicy
extends MapEvictionPolicy
implements IdentifiedDataSerializable

LFU eviction policy for an IMap

Field Summary

Fields

Modifier and Type	Field and Description
static LFUEvictionPolicy	INSTANCE LFU eviction policy instance.

Constructor Summary

Constructors

Constructor and Description
LFUEvictionPolicy()

Method Summary

Modifier and Type	Method and Description
int	compare(EntryView entryView1, EntryView entryView2)
boolean	equals(Object obj)
int	getFactoryId() Returns DataSerializableFactory factory ID for this class.
int	getId() Returns type identifier for this class.
int	hashCode()
void	readData(ObjectDataInput in) Reads fields from the input stream
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

INSTANCE

public static final LFUEvictionPolicy INSTANCE

LFU eviction policy instance.

Constructor Detail

LFUEvictionPolicy

public LFUEvictionPolicy()

Method Detail

compare

public int compare(EntryView entryView1,
                   EntryView entryView2)

Description copied from class: MapEvictionPolicy

If you prefer to evict the 1st entry then return negative number, if the 2nd entry is a better candidate then return a positive number or return 0 if both entries are equally good candidates for eviction

Specified by:

compare in class MapEvictionPolicy

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

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.

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.

equals

public boolean equals(Object obj)

Specified by:

equals in interface Comparator

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object