org.gridgain.grid

Class GridUuid

java.lang.Object

org.gridgain.grid.GridUuid

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, Comparable<GridUuid>, Iterable<GridUuid>, GridOptimizedMarshallable

public final class GridUuid
extends Object
implements Comparable<GridUuid>, Iterable<GridUuid>, Cloneable, Externalizable, GridOptimizedMarshallable

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 and Description
static UUID	VM_ID VM ID.

Fields inherited from interface org.gridgain.grid.marshaller.optimized.GridOptimizedMarshallable

CLS_ID_FIELD_NAME

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone()
int	compareTo(GridUuid o)
boolean	equals(Object obj)
static GridUuid	fromString(String s) Converts string into GridUuid.
static GridUuid	fromUuid(UUID id) Constructs new GridUuid based on global and local ID portions.
Object	ggClassId() Implementation of this method should simply return value of GG_CLASS_ID field.
UUID	globalId() Gets global ID portion of this GridUuid.
int	hashCode()
GridIterator<GridUuid>	iterator()
static long	lastLocalId() Gets last generated local ID.
long	localId() Gets local ID portion of this GridUuid.
static GridUuid	randomUuid() Creates new pseudo-random ID.
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	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Detail

VM_ID

public static final UUID VM_ID

VM ID.

Constructor Detail

GridUuid

public GridUuid()

Empty constructor required for Externalizable.

GridUuid

public GridUuid(UUID gid,
        long locId)

Constructs GridUuid 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 GridUuid randomUuid()

Creates new pseudo-random ID.

Returns:

Newly created pseudo-random ID.

fromUuid

public static GridUuid fromUuid(UUID id)

Constructs new GridUuid based on global and local ID portions.

Parameters:

id - UUID instance.

Returns:

Newly created pseudo-random ID.

fromString

public static GridUuid fromString(String s)

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

Parameters:

s - String to convert to GridUuid.

Returns:

GridUuid 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 GridUuid.

Returns:

Global ID portion of this GridUuid.

localId

public long localId()

Gets local ID portion of this GridUuid.

Returns:

Local ID portion of this GridUuid.

ggClassId

public Object ggClassId()

Implementation of this method should simply return value of GG_CLASS_ID field.

Specified by:

ggClassId in interface GridOptimizedMarshallable

Returns:

Class ID for optimized marshalling.

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(GridUuid o)

Specified by:

compareTo in interface Comparable<GridUuid>

iterator

public GridIterator<GridUuid> iterator()

Specified by:

iterator in interface Iterable<GridUuid>

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

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