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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Created: (JDO-630) Support specification of exact class in SingleFieldIdentity
Date Wed, 15 Apr 2009 07:22:15 GMT
Support specification of exact class in SingleFieldIdentity
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                 Key: JDO-630
                 URL: https://issues.apache.org/jira/browse/JDO-630
             Project: JDO
          Issue Type: Improvement
          Components: api2
            Reporter: Andy Jefferson
             Fix For: JDO 2 maintenance release 3


When calling PersistenceManager.getObjectById() with a SingleFieldIdentity, there seems to
be no way of avoiding the following 
(if the implementation decides to do so):
"It is an implementation decision whether to access the data store, if required to determine
the exact class. This will be the case of  inheritance, where multiple <code>PersistenceCapable</code>
classes share the same ObjectId class."

Now when I know for sure that the targetClassName of the given SingleFieldIdentity already
denotes the correct class for the given id,  how can I avoid that additional roundtrip to
the database for finding the exact class?

It would be useful to have a way of specifying a SingleFieldIdentity to be for the exact class
specified. This could be done by addition of methods
void setExact(boolean flag);
boolean getExact();
to SingleFieldIdentity

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