er.extensions.eof

Class ERXTemporaryGlobalID

java.lang.Object

com.webobjects.eocontrol.EOGlobalID

er.extensions.eof.ERXTemporaryGlobalID

All Implemented Interfaces:

Serializable, Cloneable

public class ERXTemporaryGlobalID
extends EOGlobalID

Experimental class to have quasi-GUIDs that fit into a long. Used as an alternative to the ERXLongPrimaryKeyFactory or the 24 byte built-in keys. To have it installed, set your pk prototype to "longId".
Note: by default, the key is partitioned by the lower 2 bytes host address, the lower byte of the port number and the current time in seconds. Then you have a byte left for inserts in one second.
This means, if you you are inserting - say - one thousand objects and your app crashes and restarts in 4 seconds and directly inserts new objects, then you might end up with duplicate keys. So this might only be for apps that stay at a low volume.
Also you need to be sure that your app is in one class B subnet and your instances port numbers are partitionable over the lower byte - which means less than 256 instances on one host.
Given these restrictions, you might want to stay with sequences...

See Also:

Serialized Form

Author:

ak

Field Summary

Fields inherited from class com.webobjects.eocontrol.EOGlobalID

_CLASS, GlobalIDChangedNotification

Constructor Summary

Constructors

Constructor and Description
ERXTemporaryGlobalID()

Method Summary

Modifier and Type	Method and Description
NSDictionary	dictionary(String key) Returns a pk-ready dictionary with the supplied key.
boolean	equals(Object obj)
int	hashCode()
boolean	isTemporary()
static void	setIdentifier(int value)
String	toString()
long	value()

Methods inherited from class com.webobjects.eocontrol.EOGlobalID

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

ERXTemporaryGlobalID

public ERXTemporaryGlobalID()

Method Detail

setIdentifier

public static void setIdentifier(int value)

equals

public boolean equals(Object obj)

Specified by:

equals in class EOGlobalID

isTemporary

public boolean isTemporary()

Overrides:

isTemporary in class EOGlobalID

hashCode

public int hashCode()

Specified by:

hashCode in class EOGlobalID

value

public long value()

dictionary

public NSDictionary dictionary(String key)

Returns a pk-ready dictionary with the supplied key.

Parameters:

key -

toString

public String toString()

Overrides:

toString in class Object