Hi,
First, because an entity bean -must- run inside a transaction:
Is there anyway to identify the running transaction ? I remember
something like a JNDI lookup to java:/UserTransaction but this only
works for BMT. Does something else exist to get access to the
Transaction ID ?
Then we can store this in the VO and simply return at the beginning of a
VO getter if we are in the same transaction as the one saved in the VO.
Second, I think the same problem occurs for CMP2 container vendors for
bidirectionnal relationship. Of course they run inside the container so
they have access to the Transaction. This is more simple. For
MVCSoft that runs outside the container the problem is still there,...,
except of course if it generate BMT BMP. Any thoughts are welcome here.
Third, and the most important in fact ;). How would you solve your case
if xdoclet did not exist ?
Vincent.
Colin Daly wrote:
>
> Hi all,
>
> i've been playing with the new value objects and i got quite excited
> by the new (aggregate/compose) relationship handling (Excellent job
> Vincent). We have quite a deep, complicated graph of value objects which
> we currently construct and deconstruct manually. The code is thousands
> of lines long and is tedious, repetitive and error prone. The value
> objects could blow away all of this except for one "little" problem.
> They don't seem to handle bi-directional relationships. I tried it and
> ended up with StackOverflowExceptions.
> The problem is illustrated in the xdoclet samples themselves -
> the following methods (getCustomerValue() and getAccountValue()) are
> from the samples generated source files CustomerCMP and AccountCMP
> respectively. There is a 1-N bidirectional aggregate relationship
> between Customer and Account. As you can see, there is a problem.
> Craig (a colleague) and I have had a chat about the problem and
> there doesn't appear to be any quick fix. Hopefully this mail
> will start a discussion and we will find a solution.
>
> Colin Daly.
>
>
>
>
>
> public test.interfaces.CustomerValue getCustomerValue()
> {
> if( CustomerValue == null )
> {
> CustomerValue = new test.interfaces.CustomerValue();
> }
> try
> {
> CustomerValue.setCredit( getCredit() );
> CustomerValue.setId( getId() );
> CustomerValue.setName( getName() );
> CustomerValue.setFirstName( getFirstName() );
> CustomerValue.setPhone( getPhone() );
> CustomerValue.setFax( getFax() );
> java.util.Iterator iAccountView = getAccounts().iterator();
> while (iAccountView.hasNext()){
> -----> CustomerValue.addAccountView(
>((test.interfaces.AccountLocal)iAccountView.next()).getAccountValue() );
> | }
> | CustomerValue.cleanAccountView();
> | java.util.Iterator iShippingAddressValue =
>getShippingAddresses().iterator();
> | while (iShippingAddressValue.hasNext()){
> | CustomerValue.addShippingAddressValue(
>((test.interfaces.AddressLocal)iShippingAddressValue.next()).getAddressValue() );
> | }
> CustomerValue.cleanShippingAddressValue();
> S CustomerValue.setVersion(getVersion());
> T }
> A catch (Exception e)
> C {
> K throw new javax.ejb.EJBException(e);
> }
> O return CustomerValue;
> V }
> E
> R
> F public test.interfaces.AccountValue getAccountValue()
> L {
> O if( AccountValue == null )
> W {
> AccountValue = new test.interfaces.AccountValue();
> | }
> | try
> | {
> | AccountValue.setBalance( getBalance() );
> | AccountValue.setId( getId() );
> | if ( getOwner() != null )
> -----> AccountValue.setOwnerNormalValue(getOwner().getCustomerValue() );
> }
> catch (Exception e)
> {
> throw new javax.ejb.EJBException(e);
> }
> return AccountValue;
> }
>
>
>
>
>
>
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