Proxy all types

[Todd Nine <to...@spidertracks.com>]

Hi all,
  I've run into an issue I can't seem to solve using the default Proxy
mechanism in Open JPA.  For building indexes in Cassandra, I need to
store both the value at load time, and the current value via a proxy for
any field.   I know the proxy has the change tracker, but that does not
contain a pointer to the original value.  How can I go about creating a
custom proxy that will automatically be injected by Open JPA when an
Entity is saved or loaded?

Thanks,
Todd

Re: Proxy all types

[Todd Nine <to...@spidertracks.com>]

Hi Michael,
  Thanks for the help.  I found the ProxyBean interface which seems to
be what I need.  Is there an implementation for it, or do I need to
implement it for each primitive type?

Thanks,
Todd





On Wed, 2011-03-23 at 08:32 -0500, Michael Dick wrote:

> Hi Todd,
> 
> In theory you can define your own ProxyManager which creates the
> appropriate proxy classes. I haven't tried it out myself, and I think
> some of it doesn't work as advertised (e.g. TrackChanges on the
> default ProxyManager), but it might be a good starting point. 
> 
> This area of the code needs some work, but if there's renewed interest
> we'll try to help. 
> 
> -mike
> 
> 
> On Tue, Mar 22, 2011 at 7:29 PM, Todd Nine <to...@spidertracks.com>
> wrote:
> 
>         Hi all,
>          I've run into an issue I can't seem to solve using the
>         default Proxy
>         mechanism in Open JPA.  For building indexes in Cassandra, I
>         need to
>         store both the value at load time, and the current value via a
>         proxy for
>         any field.   I know the proxy has the change tracker, but that
>         does not
>         contain a pointer to the original value.  How can I go about
>         creating a
>         custom proxy that will automatically be injected by Open JPA
>         when an
>         Entity is saved or loaded?
>         
>         Thanks,
>         Todd
>         
>         
>         
> 
> 

Re: Proxy all types

[Michael Dick <mi...@gmail.com>]

Hi Todd,

In theory you can define your own
ProxyManager<http://openjpa.apache.org/builds/latest/docs/manual/manual.html#ref_guide_pc_scos_proxy_custom>which
creates the appropriate proxy classes. I haven't tried it out myself,
and I think some of it doesn't work as advertised (e.g. TrackChanges on the
default ProxyManager), but it might be a good starting point.

This area of the code needs some work, but if there's renewed interest we'll
try to help.

-mike

On Tue, Mar 22, 2011 at 7:29 PM, Todd Nine <to...@spidertracks.com> wrote:

> Hi all,
>  I've run into an issue I can't seem to solve using the default Proxy
> mechanism in Open JPA.  For building indexes in Cassandra, I need to
> store both the value at load time, and the current value via a proxy for
> any field.   I know the proxy has the change tracker, but that does not
> contain a pointer to the original value.  How can I go about creating a
> custom proxy that will automatically be injected by Open JPA when an
> Entity is saved or loaded?
>
> Thanks,
> Todd
>
>
>
>