er.extensions.eof
Class ERXTemporaryGlobalID
java.lang.Object
com.webobjects.eocontrol.EOGlobalID
er.extensions.eof.ERXTemporaryGlobalID
- All Implemented Interfaces:
- java.io.Serializable, java.lang.Cloneable
public class ERXTemporaryGlobalID
- extends com.webobjects.eocontrol.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
Fields inherited from class com.webobjects.eocontrol.EOGlobalID |
_CLASS, GlobalIDChangedNotification |
Methods inherited from class com.webobjects.eocontrol.EOGlobalID |
clone |
Methods inherited from class java.lang.Object |
finalize, getClass, notify, notifyAll, wait, wait, wait |
ERXTemporaryGlobalID
public ERXTemporaryGlobalID()
setIdentifier
public static void setIdentifier(int value)
equals
public boolean equals(java.lang.Object obj)
- Specified by:
equals
in class com.webobjects.eocontrol.EOGlobalID
isTemporary
public boolean isTemporary()
- Overrides:
isTemporary
in class com.webobjects.eocontrol.EOGlobalID
hashCode
public int hashCode()
- Specified by:
hashCode
in class com.webobjects.eocontrol.EOGlobalID
value
public long value()
dictionary
public com.webobjects.foundation.NSDictionary dictionary(java.lang.String key)
- Returns a pk-ready dictionary with the supplied key.
- Parameters:
key
-
toString
public java.lang.String toString()
- Overrides:
toString
in class java.lang.Object
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