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<p style="margin: 10px 0 0 0">A conversation with Steve about the possible design:</p>
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<p style="margin: 10px 0 0 0"><sannegrinovero> sebersole: is there an "auto-flush" event I could listen to?<br /> <sebersole> org.hibernate.event.spi.AutoFlushEventListener<br /> <sannegrinovero> as that issue about the Session.clear() method is far more complex than what I initially thought<br /> <sannegrinovero> nice. Is that also fired if a user is performing an explicit Session.flush() ?<br /> <sebersole> no<br /> <sebersole> auto flush is a specific thing<br /> <sannegrinovero> if you could bare my thoughts: the problem is that if a user does a clear() opertion, but somehow changes where already flushed to the DB, ...<br /> <sebersole> yep<br /> <sebersole> then you dont want to clear the index<br /> <sebersole> was thining about that<br /> <sannegrinovero> exactly, or I get out of synch anyway.<br /> <sebersole> but my connection makes comms hard <img class="emoticon" src="https://hibernate.atlassian.net/images/icons/emoticons/smile.gif" height="20" width="20" align="absmiddle" alt="" border="0" /><br /> <sebersole> well its a tough deal<br /> <sannegrinovero> is there a specific event for flush() or could I add one like with clear() ?<br /> <sebersole> there is a flush event too yes<br /> <sannegrinovero> ah great.<br /> <sebersole> org.hibernate.event.spi.FlushEventListener<br /> <sebersole> there is also...<br /> <sebersole> org.hibernate.event.spi.FlushEntityEventListener<br /> <sebersole> which is the listener for each entity within a flush (no matter if auto or explicit)<br /> <sannegrinovero> you agree that if I listen to both flush events & and hypotetical clear event then I should have enough info to do "the right thing" at TX commit?<br /> <sebersole> do you have a notion of flushing the pending index updates?<br /> <sannegrinovero> yes<br /> <sebersole> other than transactionally<br /> <sannegrinovero> we provide an explicit method for that, "flushToIndexes()"<br /> <sannegrinovero> which forces a flush even if the transaction is not finished yet<br /> <sebersole> but is that a transaction boundary thing?<br /> <sebersole> so transaction still has an effect?<br /> <sannegrinovero> it's similar to the Session.flush() with the important difference that it won't be cancelled by a TX rollback<br /> <sebersole> well thats a very important diff <img class="emoticon" src="https://hibernate.atlassian.net/images/icons/emoticons/smile.gif" height="20" width="20" align="absmiddle" alt="" border="0" /><br /> <sebersole> you really need something akin to our actionqueue<br /> <sannegrinovero> right, but we can't do much about it, other than clearly document it.<br /> <sebersole> a "staging" place for actions<br /> <sannegrinovero> we have something like that, it's where we collect all events from the ORM listeners normally.<br /> <sannegrinovero> it's then registered in a tx synch, so we "flush" it to indexes as an after-commit event.<br /> <sebersole> but you need to know which have been flushed<br /> <sebersole> in the orm sense<br /> <sebersole> so you know what to do properly on clear<br /> <sebersole> couple ways to attack this, but thats the crux<br /> <sannegrinovero> my thought was that on a flush, we would receive a sequence of ORM events, so I collect all these in a block.<br /> <sebersole> thats FlushEntityEventListener<br /> <sebersole> you'd get one per entity being flushed<br /> <sannegrinovero> ah I thought that ORM would flush all or nothing? Is it able to flush only a specific type?<br /> <sebersole> well thats essentially what an auto flush is<br /> <sebersole> we have a query that we know hits the table Animal, e.g.<br /> <sannegrinovero> I see, so the "auto" one is somewat smar and flushes only the minimum needed to achieve consistency with queries, no more. Right?<br /> <sebersole> so flush all entity changes that write to that table<br /> <sebersole> yep<br /> <sannegrinovero> cool, thanks I'll take it from here.<br /> <sebersole> partial flush is a better name probably<br /> <sannegrinovero> now that I know the bird's eye design it's much easier to handle. thanks<br /> <sebersole> np<br /> <sebersole> btw, FlushEntityEventListener is not per type<br /> <sebersole> its literally per entity<br /> <sebersole> each instance<br /> <sebersole> Animal#1, Animal#2, ...<br /> <sannegrinovero> great that makes it easier<br /> <sannegrinovero> I can then literally "promote" each update task to a separate level where it's "protected" from clear()<br /> <sebersole> exactly<br /> <sebersole> thats my "staging"</p>
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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HSEARCH" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-1270" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-1270" style="color: #3b73af; text-decoration: none">HSEARCH-1270</a>
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I have a use-case with a nested transaction in a loop. <br /> <br /> When the nested transaction is committed, I manually flush and clear the Hibernate-Session, because otherwise, the program would run into an {{OutOfMemoryException}}, because it loads to many objects into the Hibernate session. <br /> <br /> Sometimes, the nested transaction is rolled back, to cancel some wor...
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