net.viktorc.detroid.framework.engine

Class ETEntry

Object

ETEntry

All Implemented Interfaces:

Comparable<ETEntry>, Cache.Entry<ETEntry>

public class ETEntry
extends Object
implements Cache.Entry<ETEntry>

An evaluation hash table entry that stores information about the static evaluation scores of leaf nodes. It uses Robert Hyatt's lock-less hashing.

Author:

Viktor

Constructor Summary

Constructors

Constructor and Description
ETEntry()

Method Summary

Modifier and Type	Method and Description
void	assume(ETEntry entry) It has the object assume the state of the parameter instance.
int	compareTo(ETEntry e)
void	empty() It renders the entry empty.
byte	getGeneration()
long	getKey()
short	getScore()
long	hashKey() Returns a long integer hash code.
boolean	isEmpty() Determines whether the entry is to be considered void.
void	set(long key, short score, byte generation)
void	setGeneration(byte generation)
void	setupKey() XORs the data fields into the key.
void	swap(ETEntry entry) It swaps the states of the object and the parameter instance.
String	toString()

Methods inherited from class Object

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

Constructor Detail

ETEntry

public ETEntry()

Method Detail

getKey

public long getKey()

Returns:

The 64 bit position hash key.

getScore

public short getScore()

Returns:

The evaluation score.

getGeneration

public byte getGeneration()

Returns:

The age of the entry.

setGeneration

public void setGeneration(byte generation)

Parameters:

generation - The age of the entry.

set

public void set(long key,
                short score,
                byte generation)

Parameters:

key - The 64 bit position hash key.

score - The evaluation score.

generation - The age of the entry.

setupKey

public void setupKey()

XORs the data fields into the key.

hashKey

public long hashKey()

Description copied from interface: Cache.Entry

Returns a long integer hash code.

Specified by:

hashKey in interface Cache.Entry<ETEntry>

Returns:

A 64 bit hash key.

isEmpty

public boolean isEmpty()

Description copied from interface: Cache.Entry

Determines whether the entry is to be considered void.

Specified by:

isEmpty in interface Cache.Entry<ETEntry>

Returns:

Whether the entry is empty, by whatever definition.

assume

public void assume(ETEntry entry)

Description copied from interface: Cache.Entry

It has the object assume the state of the parameter instance.

Specified by:

assume in interface Cache.Entry<ETEntry>

Parameters:

entry - The entry whose state is to be assumed.

swap

public void swap(ETEntry entry)

Description copied from interface: Cache.Entry

It swaps the states of the object and the parameter instance.

Specified by:

swap in interface Cache.Entry<ETEntry>

Parameters:

entry - The instance with which the entry on which the method is invoked is supposed to swap states.

empty

public void empty()

Description copied from interface: Cache.Entry

It renders the entry empty.

Specified by:

empty in interface Cache.Entry<ETEntry>

compareTo

public int compareTo(ETEntry e)

Specified by:

compareTo in interface Comparable<ETEntry>

toString

public String toString()

Overrides:

toString in class Object