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From Chad Smith <chadksmi...@gmail.com>
Subject A little help w/ session state please
Date Wed, 07 Jan 2009 14:04:52 GMT
I have a web app that uses Cayenne 2.0.4 w/ Spring and it uses a servlet filter to manage the
data context ...

Request init code
--------------------------------
HttpSession session = ((HttpServletRequest)servletRequest).getSession(true);
DataContext dataContext = ServletUtil.getSessionContext(session);
DataContext.bindThreadDataContext(dataContext);


Request destroy code
--------------------------------
DataContext dataContext = DataContext.getThreadDataContext();
if (dataContext.hasChanges()) {
    dataContext.rollbackChanges();
}            
DataContext.bindThreadDataContext(null);

... I also have a parent table and child table in which the child table has a circular reference
to itself

parent table: Forum
    
    forum.forum_id

child table: forum_thread

    forum_thread.forum_id
    forum_thread.thread_id
    forum_thread.parent_thread_id (the circular reference)

... here is the cayenne mapping xml for the relationships ...

<db-relationship name="forumToThread" source="forum" target="forum_thread" toMany="true">
	<db-attribute-pair source="forum_id" target="forum_id"/>
</db-relationship>
<db-relationship name="subThreadToThread" source="forum_thread" target="forum_thread" toMany="false">
	<db-attribute-pair source="parent_thread_id" target="thread_id"/>
</db-relationship>
<db-relationship name="threadToForum" source="forum_thread" target="forum" toMany="false">
	<db-attribute-pair source="forum_id" target="forum_id"/>
</db-relationship>
<db-relationship name="threadToSubThread" source="forum_thread" target="forum_thread" toMany="true">
	<db-attribute-pair source="thread_id" target="parent_thread_id"/>
</db-relationship>
<obj-relationship name="forumToThread" source="Forum" target="Thread" deleteRule="Cascade"
db-relationship-path="forumToThread"/>
<obj-relationship name="subThreadToThread" source="Thread" target="Thread" db-relationship-path="subThreadToThread"/>
<obj-relationship name="threadToForum" source="Thread" target="Forum" db-relationship-path="threadToForum"/>
<obj-relationship name="threadToSubThread" source="Thread" target="Thread" deleteRule="Cascade"
db-relationship-path="threadToSubThread"/>

... here is the code I'm using to delete a thread ...

    public boolean deleteThread(int threadId) throws DataAccessException {
        // NOTE: transactions are auto commit unless otherwise specified!
        Thread thread = loadThread(threadId);
        
        // remove any parent association
        if (thread.getSubThreadToThread() != null) {
            Thread parentThread = thread.getSubThreadToThread();
            parentThread.removeFromThreadToSubThread(thread);
        }
        
        // remove forum association
        Forum forum = thread.getThreadToForum();
        forum.removeFromForumToThread(thread);
        
        super.delete(thread);
        return true;
    }

... so here is the problem: I setup the following data

Forum record which has 3 top level thread records.  Lets say thread 2 has several children
and several grand children.  When I delete one of thread 2's children it does the database
deletes perfectly (cascade deletes of the correct grandchildren), however, the gui continues
to show the grand children but the child record (that was deleted) is gone. Here is the SQL
and the data context looks clean before and after processing .... 

CayenneDao >>> --------------- Cayenne Context: 2009-01-07 06:49:40 ----------------
- hasChanges = false | isTransactionEventsEnabled = false | isUsingSharedSnapshotCache = true
| isValidatingObjectsOnCommit = true
2009-01-07 06:49:40,953 INFO (QueryLogger.java:423) - --- will run 1 query.
2009-01-07 06:49:40,953 INFO (QueryLogger.java:377) - --- transaction started.
2009-01-07 06:49:40,953 INFO (QueryLogger.java:300) - DELETE FROM gtools.forum_thread WHERE
thread_id = ?
2009-01-07 06:49:40,953 INFO (QueryLogger.java:322) - [bind: 228]
2009-01-07 06:49:40,968 INFO (QueryLogger.java:368) - === updated 1 row.
2009-01-07 06:49:40,968 INFO (QueryLogger.java:322) - [bind: 227]
2009-01-07 06:49:40,968 INFO (QueryLogger.java:368) - === updated 1 row.
2009-01-07 06:49:40,968 INFO (QueryLogger.java:322) - [bind: 226]
2009-01-07 06:49:40,968 INFO (QueryLogger.java:368) - === updated 1 row.
2009-01-07 06:49:41,015 INFO (QueryLogger.java:384) - +++ transaction committed.
CayenneDao >>> --------------- Cayenne Context: 2009-01-07 06:49:41 ----------------
- hasChanges = false | isTransactionEventsEnabled = false | isUsingSharedSnapshotCache = true
| isValidatingObjectsOnCommit = true

... no matter where I go w/in the application the data (grand children) seems to stick in
the cache but if I log off and back on they are now gone (no longer in the object cache).
 What am I doing wrong here?  I know that is a lot to wade through but I would greatly appreciate
any help on diagnosing the problem.

Thanks in advance.
Chad

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