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From Andrey Razumovsky <razumovsky.and...@gmail.com>
Subject Re: Updating DataMap through ROP client
Date Tue, 17 Feb 2009 20:01:12 GMT
Hi again,

I've done some surfing through the code. Probably this information will be
useful for you:
Cayenne-Hessian classes do not have their own Configuration instance, but
they do have their own EntityResolver instance, which is created using
EntityResolver.getClientEntityResolver(). This object is created once, so I
assume you should modify it as well after you modified server
EntityResolver, e.g.

resolver.getClientEntityResolver().setDataMaps(new ArrayList<DataMap>());
for (DataMap map : resolver.getDataMaps()) {
                    DataMap clientMap = map.getClientDataMap(resolver);

                        if (clientMap != null) {

resolver.getClientEntityResolver().addDataMap(clientMap);
                        }
                    }

Hope this helps!

2009/2/17 Zissis Trabaris <z.trabaris@insysware.com>

> The ROP server is controlled by an instance of HessianServlet. I have
> tried to run Configuration.getSharedConfiguration() to get the map from
> the server and then clear the EntityResolver that way but it seems like
> the HessianServlet has its own version of the Configuration instance
> therefore its EntityResolver does not get cleared. The reason I must
> modify the Maps from the ROP client is that our application is
> distributed over the Web and has an MDA modeling component that allows
> our business users to modify the application at runtime. By doing so,
> they can create new tables or modify existing tables. Once they have
> finished modeling, they need the capability to synchronize Cayenne with
> the new models right from their ROP client in order for everyone else to
> use the changes. The client application must work through firewalls and
> HTTP proxies so I am forced to code everything in the ROP client layer.
> If I knew how to get access to HessianServlet's instance of the
> Configuration instance on the server side I could clear the
> EntityResolver and everything would work perfectly.
>
> Zissis Trabaris * Chief Technology Officer * INSYSWARE * 3235 West River
> Road, Grand Island, New York, 14072, USA
> Mobile (716) 930-5654 * Office (518) 636-4118 * Fax (716) 625-1305 *
> z.trabaris@insysware.com * www.insysware.com
>
> CONFIDENTIALITY: This email (including any attachments) may contain
> confidential, proprietary and privileged information, and unauthorized
> disclosure or use is prohibited. If you received this email in error,
> please notify the sender and delete this email from your system. Thank
> you.
>
>
> -----Original Message-----
> From: Andrey Razumovsky [mailto:razumovsky.andrey@gmail.com]
> Sent: Tuesday, February 17, 2009 12:21 PM
> To: user@cayenne.apache.org
> Subject: Re: Updating DataMap through ROP client
>
> The most common case to fetch Configuration instance in server is via
> Configuration.getSharedConfiguration(). But I still don't understand why
> you
> don't want to apply all changes on server side. This way, in theory, no
> reloading will be required on server (except cache cleaning).
>
> 2009/2/17 Zissis Trabaris <z.trabaris@insysware.com>
>
> > I can clear the EntityResolver on the client side but since I don't
> know
> > how to get to the Configuration instance on the server side I can't
> > re-load the maps. Without re-loading the maps on the server side, I
> will
> > always get an entity not found exception when I try to use a newly
> added
> > ObjEntity.
> >
> > Zissis Trabaris * Chief Technology Officer * INSYSWARE * 3235 West
> River
> > Road, Grand Island, New York, 14072, USA
> > Mobile (716) 930-5654 * Office (518) 636-4118 * Fax (716) 625-1305 *
> > z.trabaris@insysware.com * www.insysware.com
> >
> > CONFIDENTIALITY: This email (including any attachments) may contain
> > confidential, proprietary and privileged information, and unauthorized
> > disclosure or use is prohibited. If you received this email in error,
> > please notify the sender and delete this email from your system. Thank
> > you.
> >
> >
> > -----Original Message-----
> > From: Andrey Razumovsky [mailto:razumovsky.andrey@gmail.com]
> > Sent: Monday, February 16, 2009 3:15 PM
> > To: user@cayenne.apache.org
> > Subject: Re: Updating DataMap through ROP client
> >
> > I don't know details of Hessian, but I don't think HessianServlet
> caches
> > any
> > data. Have you tried simply clearing client context's cache?
> >
> > 2009/2/16 Zissis Trabaris <z.trabaris@insysware.com>
> >
> > > I have solved the DataMap problem with the following: I have created
> > an
> > > HTTP back-channel that send the map xmls to the client. The client
> > then
> > > creates a new Configuration instance, modifies the data maps,
> > serializes
> > > the results to XML, sends them to the server and the server saves
> them
> > > to disk. The remaining problems to solve are the following:
> > >
> > > 1) I need to somehow refresh the configuration instances that are in
> > > memory for the HessianServlet.
> > > 2) Once refreshed, I need to somehow clear the object caches of the
> > > HessianServlet.
> > >
> > > All of this without dropping any connections that the HessianServlet
> > is
> > > servicing.
> > >
> > > Zissis Trabaris * Chief Technology Officer * INSYSWARE * 3235 West
> > River
> > > Road, Grand Island, New York, 14072, USA
> > > Mobile (716) 930-5654 * Office (518) 636-4118 * Fax (716) 625-1305 *
> > > z.trabaris@insysware.com * www.insysware.com
> > >
> > > CONFIDENTIALITY: This email (including any attachments) may contain
> > > confidential, proprietary and privileged information, and
> unauthorized
> > > disclosure or use is prohibited. If you received this email in
> error,
> > > please notify the sender and delete this email from your system.
> Thank
> > > you.
> > >
> > >
> > > -----Original Message-----
> > > From: Andrey Razumovsky [mailto:razumovsky.andrey@gmail.com]
> > > Sent: Sunday, February 15, 2009 1:10 PM
> > > To: user@cayenne.apache.org
> > > Subject: Re: Updating DataMap through ROP client
> > >
> > > Hi Zissis,
> > >
> > > DbEntities are not being sent to client (and DataMap is sent
> trimmed).
> > > So I
> > > don't think you can perform DataMap changes from client. What I
> would
> > > try to
> > > do is to write a custom query which performs your operations and the
> > > fire it
> > > from the client. I'm not sure this will work though.
> > >
> > > Regards,
> > > Andrey
> > >
> > > 2009/2/15 Zissis Trabaris <z.trabaris@insysware.com>
> > >
> > > > We have an ROP client that acts as a modeler for our runtime
> > > > application. Is there any way to modify a DataMap via an ROP
> client
> > > > layer, synchronize the DB schema like I would do using
> > > > ExecutingMergerContext at the server layer and then clear the
> server
> > > and
> > > > client object caches without dropping the ROP connection?
> > > >
> > > >
> > > >
> > > > Zissis Trabaris * Chief Technology Officer * INSYSWARE * 3235 West
> > > River
> > > > Road, Grand Island, New York, 14072, USA
> > > > Mobile (716) 930-5654 * Office (518) 636-4118 * Fax (716) 625-1305
> *
> > > > z.trabaris@insysware.com
> > > <mailto:%20%20z.trabaris@insysware.com<20%2520z.trabaris@insysware.com>
> <20%2520z.trabaris@insysware.com <20%252520z.trabaris@insysware.com>>
> > <20%2520z.trabaris@insysware.com <20%252520z.trabaris@insysware.com> <
> 20%252520z.trabaris@insysware.com <20%25252520z.trabaris@insysware.com>>><
> > > 20%2520z.trabaris@insysware.com <20%252520z.trabaris@insysware.com> <
> 20%252520z.trabaris@insysware.com <20%25252520z.trabaris@insysware.com>>
> <
> > 20%252520z.trabaris@insysware.com <20%25252520z.trabaris@insysware.com>
> <20%25252520z.trabaris@insysware.com<20%2525252520z.trabaris@insysware.com>
> >>>>
> > > >  *
> > > > www.insysware.com <http://www.insysware.com/>
> > > >
> > > > ________________________________
> > > >
> > > > CONFIDENTIALITY: This email (including any attachments) may
> contain
> > > > confidential, proprietary and privileged information, and
> > unauthorized
> > > > disclosure or use is prohibited. If you received this email in
> > error,
> > > > please notify the sender and delete this email from your system.
> > Thank
> > > > you.
> > > >
> > > >
> > > >
> > > >
> > >
> >
>

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