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Re: [eclipselink-users] Virtual Metlhods | questions
|
Hi Tom,
I also checked the spring entity manager creations (JpaTemplate).
Please see the code below. getEntityManagerFactory() basically uses the
same entitymanager factory, to which I added new mappings.
/**
* Create a close-suppressing proxy for the given JPA EntityManager.
* The proxy also prepares returned JPA Query objects.
* @param em the JPA EntityManager to create a proxy for
* @return the EntityManager proxy, implementing all interfaces
* implemented by the passed-in EntityManager object (that is,
* also implementing all provider-specific extension interfaces)
* @see javax.persistence.EntityManager#close
*/
protected EntityManager createEntityManagerProxy(EntityManager em) {
Class[] ifcs = null;
EntityManagerFactory emf = getEntityManagerFactory();
if (emf instanceof EntityManagerFactoryInfo) {
Class entityManagerInterface = ((EntityManagerFactoryInfo)
emf).getEntityManagerInterface();
if (entityManagerInterface != null) {
ifcs = new Class[] {entityManagerInterface};
}
}
if (ifcs == null) {
ifcs = ClassUtils.getAllInterfacesForClass(em.getClass());
}
return (EntityManager) Proxy.newProxyInstance(
em.getClass().getClassLoader(), ifcs, new
CloseSuppressingInvocationHandler(em));
}
On 25-07-2012 02:31 PM, gaurav malhotra wrote:
Hi Tom,
The issues currently I am facing are as follows
1) An application event (which is published on all the nodes in the
cluster - coherence grid aware) is triggered when there is a need to
create a mapping. (Works fine)
2) I have service named DynamicRecordWeaverImpl which creates the
mappings as follows (Please verify, if below correct way of adding
mappings. As chris mentioned I am not creating mapping on active session)
NOTE >> after weave method, I can see the need added relationship
in the session.
@Autowired
private DynamicRecordContext dynamicRecordContext;
@Autowired
@Qualifier("entityManagerFactory")
private LocalContainerEntityManagerFactoryBean
localContainerEntityManagerFactoryBean;
/*
* (non-Javadoc)
* @see
com.oracle.healthinsurance.common.domain.internal.dyndata.components.DynamicRecordWeaver#weave()
*/
@SuppressWarnings("rawtypes")
@Override
public void weave() {
JpaEntityManagerFactory jpaEntityManagerFactory =
JpaEntityManagerFactory.class.cast(localContainerEntityManagerFactoryBean
.getNativeEntityManagerFactory());
Session session = jpaEntityManagerFactory.getServerSession();
for (Map.Entry<Class, ClassDescriptor> entry :
session.getDescriptors().entrySet()) {
if (MetaModelUtil.isDynamicRecordContainer(entry.getKey())) {
Class<? extends
DynamicRecordContainer<DynamicRecordStorable>>
dynamicRecordContainerClass = CastUtil
.uncheckedCast(entry.getKey());
Class<? extends DynamicRecordStorable>
dynamicRecordStorableClass = CastUtil
.uncheckedCast(GenericTypeResolver.resolveTypeArgument(dynamicRecordContainerClass,
DynamicRecordContainer.class));
ClassDescriptor dynamicRecordContainerClassCd =
session.getDescriptor(dynamicRecordContainerClass);
ClassDescriptor dynamicRecordStorableClassCd =
session.getDescriptor(EclipseLinkMetadata
.getDomainClass(dynamicRecordStorableClass));
Map<String, DynamicRecordSetup> dynamicRecordSetupMap
= dynamicRecordContext
.doGetDynamicRecordsSetup(dynamicRecordContainerClass);
for (Map.Entry<String, DynamicRecordSetup> setupEntry
: dynamicRecordSetupMap.entrySet()) {
String fieldName = setupEntry.getKey();
DynamicRecordSetup dynamicRecordSetup =
setupEntry.getValue();
// OneToMany
oneToManyMapping(dynamicRecordContainerClassCd, fieldName,
dynamicRecordStorableClassCd.getJavaClass());
for (FieldDetails fieldDetails :
dynamicRecordSetup.getFieldDetailsList()) {
// Add the attributes dynamicRecordStorableClass
String attributeName = fieldDetails.getCode();
String columnName = columnName(fieldDetails);
Class<?> attributeType =
attributeType(fieldDetails);
directFieldMapping(dynamicRecordStorableClassCd, attributeName,
columnName, attributeType);
}
}
}
}
jpaEntityManagerFactory.refreshMetadata(null);
System.gc();
3) You mentioned >> " The way refreshMetadata works, should allow your
system to stay live. When you call refreshMetadata, all existing
EntityManagers continue to operate on the previous metadata. The new
metadata is only in effect for new EntityManagers. "
Now I am searching for entity to which new mappings where added.
What I found that entityManager does not contain the newly added
mappings. I cann't figure out why?? It should be picked up?? so do I
have keep adding the mappings for each session and call
refreshMetadata, this doen't look elegant. Is some where there is
caching of entity managers happening???
On 25-07-2012 01:56 PM, Tom Ware wrote:
Hi Gaurav,
I am assuming you've figured out how to get refreshMetadata to work
for you to get your mappings added. EclipseLink itself does not
provide a mechanism to trigger the refresh There are a number of
options open to you depending on how your app is architected, JMS,
RMI, ServerSentEvents, WebSockets, Oracle QCN/DCN combined with one
of those technologies.
The way refreshMetadata works, should allow your system to stay
live. When you call refreshMetadata, all existing EntityManagers
continue to operate on the previous metadata. The new metadata is
only in effect for new EntityManagers.
-Tom
On 24/07/2012 8:12 PM, gaurav malhotra wrote:
I understand the problem, but I don't know how to fix it.
1) I am recording all the changes (we store them in the database)
2) I don't know how to signal that session needs to pick them using
refreshMetadata. Does this mean using SessionEventAdapter?? If yes
then which
method(s) should I use. As per my understanding refreshMetadata
should be only
called once if there are recorded changes. When recorded changes has
been pushed
to session, then there is no need to refreshMetadata. It will be
great if you
point me some code snippets.
Also, my product, is a claim processing system (with millions of
transactions
handled in a day). What is the impact of refreshMetadata on the running
transactions?? We dont expect setup for the dynamic fields change
every another
minute or a day??
On 25-07-2012 12:04 AM, Christopher Delahunt wrote:
Through a metadata source repository, or the customizer approach.
Your app
must record the changes that are needed somehow and then signal
that the
session needs to pick them up using refreshMetadata. The app should
not
directly change the running session.
On 2012-07-24, at 5:47 PM, gaurav malhotra
<gaurav.malhotra@xxxxxxxxxx> wrote:
Hi Chris,
It's the requirement of my product - Dynamic Fields can be
configured at the
runtime and should be picked up in live application with zero down
time. Its
for the dynamic fields I am creating the mappings.
How to accomplish above reqirement?
~Gaurav
On 24-07-2012 11:29 PM, Christopher Delahunt wrote:
This would occur if the mapping has not been initialized;
initialization
occurs during session login. Earlier posts showed mappings being
added
through a session customizer which get called prior to login. How
and when
is this mapping added?
Calling refreshMetadata as Tom mentions creates a new session
from the
metadata, and would call customizers on it before logging in. If
your
customizer picks up the new mapping changes, then that might
explain why it
works for you, since they get initialized with the new session
login.
It is not a good idea to make mapping/descriptor changes to
active sessions
after login has occurred.
On 24/07/2012 5:05 PM, gaurav malhotra wrote:
ava.lang.NullPointerException
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2019)
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:1987)
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.buildCloneFromRow(ForeignReferenceMapping.java:276)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:1548)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:1694)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:664)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:601)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:560)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:717)
at
org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:769)
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