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From: Ramsey Gurley <rgurley@smarthealth.com>
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Subject: ServerRuntime from ObjectContext
Message-Id: <3E821683-E61D-4E67-86CF-3EFA1DECC6B9@smarthealth.com>
Date: Tue, 6 Sep 2016 14:01:10 -0700
To: user@cayenne.apache.org
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archived-at: Tue, 06 Sep 2016 21:01:19 -0000

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Hi all,

Long time EOF/WebObjects user, new to Cayenne. I=92m finding a lot of =
Cayenne is very similar to EOF. There are clearly major differences too. =
One of these is the ServerRuntime concept. It seems like it is fairly =
similar to an EOObjectStoreCoordinator at first glance, but I=92m =
finding it is quite different.=20

Let me share some code to illustrate my confusion:

final ServerRuntime first =3D new ServerRuntime("cayenne-project.xml");
final ServerRuntime second =3D new ServerRuntime("cayenne-project.xml");
final ServerRuntime third =3D new ServerRuntime("cayenne-project2.xml");
final ObjectContext oc =3D first.newContext();
final ObjectContext oc2 =3D second.newContext(oc);
final ObjectContext oc3 =3D third.newContext(oc);
final ObjectContext oc4 =3D third.newContext();
final ObjectContext oc5 =3D first.newContext(oc4);
final Customer c1 =3D Customer.customerForLoginId(oc, "login id");
final Customer c2 =3D Customer.customerForLoginId(oc2, "login id");
final Customer c3 =3D Customer.customerForLoginId(oc3, "login id");
final Customer c4 =3D Customer.customerForLoginId(oc4, "login id");
final Customer c5 =3D Customer.customerForLoginId(oc5, "login id");

where

public static Customer customerForLoginId(final ObjectContext context, =
final String loginId) {
	return SelectQuery.query(Customer.class, =
LOGIN_ID.eq(loginId)).selectOne(context);
}

cayenne-project.xml contains all my cayenne models. cayenne-project2.xml =
is entirely empty. Exceptions are not thrown until the last two lines =
fetching c4 and c5. I didn=92t expect to make it past oc2. I only =
expected c1 to work for fetching.

In the given situation, I=92m obviously working on authentication. In =
the EOF code there is a process that logs a login attempt. In order to =
do that in EOF, I use a peer editing context to create, edit, and save =
the log object to the database. Therefore, I need a way to get a peer =
ObjectContext given an ObjectContext. Thus far, the best I=92ve come up =
with is to have a public static final ServerRuntime stashed on a utility =
class, and use that one instance for everything=85 but this seems to go =
against all the work done with dependency injection. I tried to follow =
the advice found in this message,

=
http://cayenne.markmail.org/search/?q=3Dpeer+objectcontext#query:peer%20ob=
jectcontext+page:2+mid:v77r6qhv6c4m72iy+state:results

but storing the Injector in the user properties breaks serialization of =
the ObjectContext. Is there an easy way to get a peer OC that I am =
missing? Also, how do I know the OC is appropriate for something like a =
SelectQuery? Do I need to wrap all calls in try blocks in case some code =
hands in the wrong ServerRuntime=92s OC?

Thanks,

Ramsey


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