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Date: Wed, 20 Dec 2006 04:00:27 -0800 (PST)
From: =?utf-8?Q?J=C3=B6rg_von_Frantzius_=28JIRA=29?= <jira@apache.org>
To: jdo-dev@db.apache.org
Subject: [jira] Commented: (JDO-445) Add convenience method that returns a
 PersistenceManager proxy
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    [ http://issues.apache.org/jira/browse/JDO-445?page=3Dcomments#action_1=
2459912 ]=20
           =20
J=C3=B6rg von Frantzius commented on JDO-445:
----------------------------------------

And what about non-transactional reads? What we do in our systems is to kee=
p track of one PM per thread in a Map, and upon returning a PM, we iterate =
the keyset() of threads in this map, "reaping" dead threads by closing thei=
r PMs if they weren't closed already, and removing found dead threads from =
the Map afterwards.

As far as I can see, this could provide an implementation of the proposed m=
ethods, as with an ongoing transaction the current thread is equivalent to =
the ongoing transaction. The only problem could be transactions that (seque=
ntially) span multiple threads, but I don't believe that any XA implementat=
ion supports that scenario anyway.

> Add convenience method that returns a PersistenceManager proxy
> --------------------------------------------------------------
>
>                 Key: JDO-445
>                 URL: http://issues.apache.org/jira/browse/JDO-445
>             Project: JDO
>          Issue Type: New Feature
>          Components: api2, api2-legacy
>            Reporter: Michelle Caisse
>         Assigned To: Craig Russell
>             Fix For: JDO 2 maintenance release 1
>
>         Attachments: PMProxy-patch.txt
>
>
> In Chapter 8, add a convenience method that returns a PersistenceManager =
proxy that can be used in web and ejb containers to dynamically bind to the=
 transaction-associated PersistenceManager.

--=20
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