Package org.apache.ignite.lang

Class IgniteUuid

java.lang.Object

org.apache.ignite.lang.IgniteUuid

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, Comparable<IgniteUuid>, Iterable<IgniteUuid>, Binarylizable

public final class IgniteUuid
extends Object
implements Comparable<IgniteUuid>, Iterable<IgniteUuid>, Cloneable, Externalizable, Binarylizable

This is a faster performing version of UUID. On basic tests this version is at least 10x time faster for ID creation. It uses extra memory for 8-byte counter additionally to internal UUID.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static UUID	VM_ID	VM ID.

Constructor Summary

Constructors

Constructor	Description
IgniteUuid()	Empty constructor required for Externalizable.
IgniteUuid(UUID gid, long locId)	Constructs IgniteUuid from a global and local identifiers.

Method Summary

Modifier and Type	Method	Description
Object	clone()
int	compareTo(IgniteUuid o)
boolean	equals(Object obj)
static IgniteUuid	fromString(String s)	Converts string into IgniteUuid.
static IgniteUuid	fromUuid(UUID id)	Constructs new IgniteUuid based on global and local ID portions.
UUID	globalId()	Gets global ID portion of this IgniteUuid.
int	hashCode()
org.apache.ignite.internal.util.lang.GridIterator<IgniteUuid>	iterator()
static long	lastLocalId()	Gets last generated local ID.
long	localId()	Gets local ID portion of this IgniteUuid.
static IgniteUuid	randomUuid()	Creates new pseudo-random ID.
void	readBinary(BinaryReader reader)	Reads fields from provided reader.
void	readExternal(ObjectInput in)
String	shortString()	Gets a short string version of this ID.
String	toString()
static UUID	vmId()	Gets UUID associated with local VM.
void	writeBinary(BinaryWriter writer)	Writes fields to provided writer.
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

VM_ID

public static final UUID VM_ID

VM ID.

Constructor Detail

IgniteUuid

public IgniteUuid()

Empty constructor required for Externalizable.

IgniteUuid

public IgniteUuid(UUID gid,
                  long locId)

Constructs IgniteUuid from a global and local identifiers.

Parameters:

gid - UUID.

locId - Counter.

Method Detail

vmId

public static UUID vmId()

Gets UUID associated with local VM.

Returns:

UUID associated with local VM.

lastLocalId

public static long lastLocalId()

Gets last generated local ID.

Returns:

Last generated local ID.

randomUuid

public static IgniteUuid randomUuid()

Creates new pseudo-random ID.

Returns:

Newly created pseudo-random ID.

fromUuid

public static IgniteUuid fromUuid(UUID id)

Constructs new IgniteUuid based on global and local ID portions.

Parameters:

id - UUID instance.

Returns:

Newly created pseudo-random ID.

fromString

public static IgniteUuid fromString(String s)

Converts string into IgniteUuid. The String must be in the format generated by toString() method.

Parameters:

s - String to convert to IgniteUuid.

Returns:

IgniteUuid instance representing given string.

shortString

public String shortString()

Gets a short string version of this ID. Use it only for UI where full version is available to the application.

Returns:

Short string version of this ID.

globalId

public UUID globalId()

Gets global ID portion of this IgniteUuid.

Returns:

Global ID portion of this IgniteUuid.

localId

public long localId()

Gets local ID portion of this IgniteUuid.

Returns:

Local ID portion of this IgniteUuid.

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

compareTo

public int compareTo(IgniteUuid o)

Specified by:

compareTo in interface Comparable<IgniteUuid>

iterator

public org.apache.ignite.internal.util.lang.GridIterator<IgniteUuid> iterator()

Specified by:

iterator in interface Iterable<IgniteUuid>

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

writeBinary

public void writeBinary(BinaryWriter writer)
                 throws BinaryObjectException

Writes fields to provided writer.

Specified by:

writeBinary in interface Binarylizable

Parameters:

writer - Binary object writer.

Throws:

BinaryObjectException - In case of error.

readBinary

public void readBinary(BinaryReader reader)
                throws BinaryObjectException

Reads fields from provided reader.

Specified by:

readBinary in interface Binarylizable

Parameters:

reader - Binary object reader.

Throws:

BinaryObjectException - In case of error.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

toString

public String toString()

Overrides:

toString in class Object