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From "Rick Curtis (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OPENJPA-2068) Improve performance of java.util.Calendar fields
Date Wed, 02 Nov 2011 19:47:32 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Curtis updated OPENJPA-2068:
---------------------------------

    Attachment: OPENJPA-2068.patch

I'm attaching a patch with a bulk of the changes. Obviously this isn't complete, but I want
to get something out here.
                
> Improve performance of java.util.Calendar fields
> ------------------------------------------------
>
>                 Key: OPENJPA-2068
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2068
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc
>    Affects Versions: 2.2.0
>            Reporter: Rick Curtis
>            Assignee: Rick Curtis
>         Attachments: OPENJPA-2068.patch
>
>
> While doing some performance testing, I've found that we could improve the performance
of loading Entities that have java.util.Calendar fields. When loading the data into a Calendar
field, we actually create two Calendar instances per field. Normally creating an extra instance
wouldn't be that big of a deal, but since creating a Calendar is very expensive I would like
to remove creation of the extra instance.
> The call flow is something like this:
> - em.find(...) // find an Entity which has a calendar field
> ... execute query, processing result set...
> - DBDictionary.getCalendar(ResultSet,...) // Here we pull a Timestamp out of the result
set, and create an unproxied Calendar instance.
> ...
> // now while trying to store the Calendar into the Entity instance, we find that this
type needs to be proxied. 
> SingleFieldManager.proxy(...) // Here we create the second Calendar instance, which is
a proxied calendar
> I'd like to add a configuration property to DBDictionary that tells the runtime to always
create proxied calendar instances. This would remove the creation of the initial un-proxied
instance. For a large majority of application which use Calendars this would help. 
> As always, there is a catch to this approach. If you were to execute a query such as
: em.createQuery("SELECT c.myCal FROM CalendarEntity c where c.id=:id", MyCalendar.class),
you would get back a proxied instance. This shouldn't be that big of a deal... but still a
bit of a quirk.

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