|
|
|
 |
|
Sort Order:
This issue is with regard to
Animal snoop = pm.newInstance(Animal.class); pm.makePersistent(snoop); SingleFieldIdentity oid = (SingleFieldIdentity) pm.getObjectId(snoop); In this case, the oid refers to a single instance in the datastore, and the mapping is specified in the metadata for the Animal interface. if...
Animal snoopy = pm.newInstance(Animal.class); pm.makePersistent(snoopy); SingleFieldIdentity oid = (SingleFieldIdentity) pm.getObjectId(snoopy); //snoopy@Animal.class ... Dog snoopy= new Dog(); pm.makePersistent(snoopy); Object snoopyId = Object pm.getObjectId(snoopy); //snoopy@Dog.class ... Cat rex= new Cat(); pm.makePersistent(rex); object rexId = Object pm.getObjectId(rex); //rex@Cat.class ... Dog rex= new Dog(); pm.makePersistent(rex); object rexId = Object pm.getObjectId(rex); //rex@Dog.class ... Query q = pm.newQuery(Animal.class); results = q.execute(); To correspond to the above ids, the result in the below [snoopy@Animal.class,snoopy@Dog.class,rex@Cat.class,,rex@Dog.class] I don't agree. The make persistent operation should not care if the class definition of the persisting instance was generated by the JDO implementation or by another framework, or if it is an instance of an interface. We are storing instance of interfaces that can be PersistenceCapable, have other interfaces, and be manipulated by other parties between the instantiation and persistence, when the instance is retrieved back from database it must be of the same class. The make persistent must store the instance in a manner that it's capable to reconstruct a new instance of that same class. During reconstruction, the only way to resolve the class is storing the class name of the instance (discriminator) or putting into different tables(one table per class name). After a cold boot and with the class name on hands, we look after that class definition in the classloader to be able to reconstruct, and if the definition is there, we will not generate a new class definition. So, my point here is that snoopy's id target class should have the concrete class. Animal snoopy = pm.newInstance(Animal.class); pm.makePersistent(snoopy); SingleFieldIdentity oid = (SingleFieldIdentity) pm.getObjectId(snoopy); //snoopy@AnimalImpl.class ... Dog snoopy= new Dog(); pm.makePersistent(snoopy); Object snoopyId = Object pm.getObjectId(snoopy); //snoopy@Dog.class ... Cat rex= new Cat(); pm.makePersistent(rex); object rexId = Object pm.getObjectId(rex); //rex@Cat.class ... Dog rex= new Dog(); pm.makePersistent(rex); object rexId = Object pm.getObjectId(rex); //rex@Dog.class ... Query q = pm.newQuery(Animal.class); results = q.execute(); To correspond to the above ids, the result in the below [snoopy@AnimalImpl.class,snoopy@Dog.class,rex@Cat.class,,rex@Dog.class] Other examples could be useInstanceGenerator("default"); Animal snoopy = pm.newInstance(Animal.class); //implements PersistenceCapable useInstanceGenerator("spring"); Animal snoopyBrother1 = pm.newInstance(Animal.class); //implements PersistenceCapable, Beagle useInstanceGenerator("emf"); Animal snoopyBrother2 = pm.newInstance(Animal.class); //implements PersistenceCapable, FlyingAce pm.makePersistent(snoopy); pm.makePersistent(snoopyBrother1); pm.makePersistent(snoopyBrother2); SingleFieldIdentity snoopyOid = (SingleFieldIdentity) pm.getObjectId(snoopy); //snoopy@AnimalDefaultImpl.class SingleFieldIdentity snoopyBrother1Oid = (SingleFieldIdentity) pm.getObjectId(snoopyBrother1); //snoopyBrother1@AnimalSpringImpl.class SingleFieldIdentity snoopyBrother2Oid = (SingleFieldIdentity) pm.getObjectId(snoopyBrother2); //snoopyBrother2@AnimalEmfImpl.class more examples... useInstanceGenerator("default"); Animal snoopy = pm.newInstance(Animal.class); //implements PersistenceCapable snoopy.setName("snoopy"); useInstanceGenerator("spring"); Animal snoopyBeagle= pm.newInstance(Animal.class); //implements PersistenceCapable, Beagle snoopyBeagle.setName("snoopy"); useInstanceGenerator("emf"); Animal snoopyAce = pm.newInstance(Animal.class); //implements PersistenceCapable, FlyingAce snoopyAce.setName("snoopy"); Animal snoopyJoeCool = anotherFramework.create(Animal.class); //implements PersistenceCapable, JoeCool snoopyJoeCool .setName("snoopy"); pm.makePersistent(snoopy); pm.makePersistent(snoopyBeagle); pm.makePersistent(snoopyAce); pm.makePersistent(snoopyJoeCool); SingleFieldIdentity snoopyOid = (SingleFieldIdentity) pm.getObjectId(snoopy); //snoopy@AnimalDefaultImpl.class SingleFieldIdentity snoopyBeagleOid = (SingleFieldIdentity) pm.getObjectId(snoopyBeagle); //snoopy@AnimalSpringImpl.class SingleFieldIdentity snoopyAceOid = (SingleFieldIdentity) pm.getObjectId(snoopyAce); //snoopy@AnimalEmfImpl.class SingleFieldIdentity snoopyJoeCoolOid = (SingleFieldIdentity) pm.getObjectId(snoopyJoeCool); //snoopy@AnimalAnotherImpl.class retrieving from database... [snoopy@AnimalDefaultImpl.class,snoopy@AnimalSpringImpl.class,snoopy@AnimalEmfImpl.class,snoopy@AnimalAnotherImpl.class] Marking as Wont Fix since there was no consensus in the issue description, and JPOX/DataNucleus pass the JDO TCK as it is
|
||||||||||||||||||||||||||||||||||
Bug
Closed
Major
Persistent interface object ids have wrong target class
//SingleFieldIdentity
Interface Animal
{
}
Class dog implements Animal
{
String name="snoop"; // primary-key
}
Class cat implements Animal
{
String name="snoop"; // primary-key
}