[infinispan-dev] OGM, Hot Rod and Grouping API

[William Burns]

On Fri, Jun 6, 2014 at 9:33 AM, Emmanuel Bernard <emmanuel at hibernate.org> wrote:
>
> On 06 Jun 2014, at 15:29, Emmanuel Bernard <emmanuel at hibernate.org> wrote:
>
>
> On 06 Jun 2014, at 15:04, William Burns <mudokonman at gmail.com> wrote:
>
> Does that answer your question? Because I’m not sure what you mean by the
> key being attached to the Tx.
>
>
> The difference is say you have a tx1 on thread 1 then on the same
> thread you ask for the group, if it is in the transaction controls
> whether or not that pending update is seen.
>
> Example:
>
>   tx1 starts
>   // Note key1 is in group 1
>   cache.put(key1, someValue);
>
>   Set<K> keys = cache.getGroup("group1");
>   // The keys would contain key1 if taking part of transaction.
>
>
> Yes that would be necessary.
>
>
> That is provided by repeatable read BTW I think.

It is provided for both REPEATABLE_READ and READ_COMMITTED.

I think there is a disconnect with what we mean when we say part of
the transaction.  What we mean when we say part of the transaction is
we literally would suspend any current transaction on that thread,
start a new one if needed and then do the operation, commit/rollback
the new transaction and resume the original one.  In this case any
pending updates in the original transaction are not viewable to the
second.


>
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