[opencms-dev] Challange! External Program access to OpenCMS I nstance...
Marcus Redeker
mredeker at web.de
Sat Nov 15 23:49:02 CET 2003
Ralf,
we have OpenCMS running within JBoss. This way you have the EJB
technology running in the same VM and is really easy to access the
already existing OpenCMS object and read eg. the user information out of
it. The OpenCMS user can be mad serializable or you just create your own
user object which holds the same information. This can be done in a few
minutes.
--Marcus
> -----Original Message-----
> From: opencms-dev-admin at opencms.org
> [mailto:opencms-dev-admin at opencms.org] On Behalf Of Ralf Bierig
> Sent: Saturday, November 15, 2003 10:47 PM
> To: opencms-dev at opencms.org
> Subject: Re: [opencms-dev] Challange! External Program access
> to OpenCMS I nstance...
>
>
> Yes, I actually only need to store and read user and
> usergroup information. Sound logical...
>
> I have some more questions in the meantime.
>
> How can I insert a User in OpenCMS when I have the OpenCms
> object. In particular, do I need the CmsObject for that ? How
> can I create the CmsObject object from the OpenCms object?
> Maybe you can provide some code?
>
> Kind Regards with new hope :-),
> Ralf
>
> > What you could do is to make a server that offers commands like the
> > CmsShell which you call over RMI and the server operates on the
> > OpenCms.
> >
> > ----- Original Message -----
> > From: "Ralf Bierig" <ambiesense at gmx.de>
> > To: <opencms-dev at opencms.org>
> > Sent: Saturday, November 15, 2003 10:28 PM
> > Subject: Re: [opencms-dev] Challange! External Program access to
> > OpenCMS I nstance...
> >
> >
> > > Hi Stephan,
> > >
> > > yes, I got a NotSerializableException. It seems that I cannot use
> > > RMI interface to connect to OpenCMS. It seems that OpenCMS is not
> > > made for
> > any
> > other
> > > access then web.
> > >
> > > It is quite disappointing...
> > >
> > > Ralf
> > >
> > > > Hi Ralf,
> > > >
> > > > it won't help to mark the OpenCms class as serializable. All
> > > > members
> > of
> > > > OpenCms and the members' members have to be
> serializable as well
> > > > (or transient, but thats surely not what you want).
> > > >
> > > > Bye,
> > > > Stephan
> > > >
> > > > ----- Original Message -----
> > > > From: "Ralf Bierig" <ambiesense at gmx.de>
> > > > To: <opencms-dev at opencms.org>
> > > > Sent: Saturday, November 15, 2003 9:43 PM
> > > > Subject: RE: [opencms-dev] Challange! External Program access to
> > OpenCMS
> > I
> > > > nstance...
> > > >
> > > >
> > > > > Hello,
> > > > >
> > > > > I followed your tip and programmed a RMI Server, which is
> > > > > initiateed
> > by
> > > > the
> > > > > OpenCmsHTTPServlet class when the opencms servlet it
> called. The
> > server
> > > > is
> > > > > up
> > > > > and running.
> > > > >
> > > > > However when I access the server and want to get the OpenCms
> > > > > object
> > I
> > > > get
> > > > > the following message:
> > > > >
> > > > > System RemoteExceptionjava.rmi.UnmarshalException: error
> > unmarshalling
> > > > > return; nested exception is:
> > > > > java.io.WriteAbortedException: writing aborted;
> > > > > java.io.NotSerializableException: com.opencms.core.OpenCms
> > > > >
> > > > > The OpenCms object does indeed not implement the Serializable
> > interface.
> > > > My
> > > > > question now is, when I modify the OpenCms class file and add
> > > > > that
> > it
> > > > > implements Serializable will it work then and will it work
> > > > > properly?
> > > > >
> > > > > Is the problem another one and how can I fix it. I am soooo
> > > > > close
> > and
> > > > there
> > > > > should be a way...
> > > > >
> > > > >
> > > > > Cheers,
> > > > > Ralf
> > > > >
> > > > > > You will need RMI to call the wrapper class if you start
> > > > > > another application with "java myApplication"
> because then you
> > > > > > start a new JVM,
> > different
> > > > than
> > > > > > the JVM which is started by your web application
> and in which
> > > > > > your
> > > > wrapper
> > > > > > class was initialized.
> > > > > > w
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: ambiesense at gmx.de [mailto:ambiesense at gmx.de]
> > > > > > Sent: mercredi 12 novembre 2003 14:32
> > > > > > To: opencms-dev at opencms.org
> > > > > > Subject: RE: [opencms-dev] Challange! External
> Program access
> > > > > > to
> > > > OpenCMS
> > > > > > I nstance...
> > > > > >
> > > > > >
> > > > > > Hello Wouter,
> > > > > >
> > > > > > can another Java program (started indepentendly with "java
> > > > myApplication")
> > > > > > call the static Wrapper embedded as part of the OpenCMS
> > > > > > server? If
> > > > this
> > > > is
> > > > > > possible, then I am fine.
> > > > > >
> > > > > > I think this is more a Java question then a OpenCMS
> question.
> > > > > > I
> > > > appologise
> > > > > > if I might have confused you.
> > > > > >
> > > > > > Ralf
> > > > > >
> > > > > > > I don't understand exactly what you are trying to
> say. Why
> > > > > > > don't
> > you
> > > > > > > consider the Wrapper class as being part of the OpenCms
> > > > > > > server ?
> > > > It's
> > > > > > > the
> > > > > > > client which afterwards calls the wrapper class
> in order to
> > > > > > > get
> > > > acces
> > > > > > > to the
> > > > > > > singleton OpenCms.
> > > > > > >
> > > > > > > Concerning the other question , as long you keep the
> > > > > > > singleton
> > > > "single"
> > > > > > > there no problem that different threads or
> clients (possibly
> > through
> > > > > > > rmi)
> > > > > > > make use of the singleton. They all use a
> reference to the
> > > > > > > same
> > > > object.
> > > > > > >
> > > > > > > wouter
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: Ralf Bierig [mailto:ambiesense at gmx.de]
> > > > > > > Sent: mercredi 12 novembre 2003 11:22
> > > > > > > To: opencms-dev at opencms.org
> > > > > > > Subject: Re: [opencms-dev] Challange! External Program
> > > > > > > access to OpenCMS Instance...
> > > > > > >
> > > > > > >
> > > > > > > Hi Matt and Wouter,
> > > > > > >
> > > > > > > the method is more direct. However using this
> appraoch would
> > change
> > > > the
> > > > > > > workflow. My initial idea was that OpenCMS with data and
> > everything
> > > > is
> > > > > > > like
> > > > > > > a
> > > > > > > service and I have a client, who can access this without
> > > > > > > HTTP/SOAP/Webservice but API(local)/RMI or Sockets.
> > > > > > >
> > > > > > > Wouter's method is good but change the workflow
> in the way
> > > > > > > that
> > the
> > > > > > > OpenCMS
> > > > > > > server is acutally calling my application (the wrapper).
> > > > > > > This
> > would
> > > > > > > turn
> > > > > > > OpenCMS into a pseudo client and the application which was
> > supposed
> > > > to
> > > > > > > be a
> > > > > > > client into a pseudo server. The application would be
> > > > > > > invoked by starting OpenCMS.
> > > > > > > I would like it however the other way round. Would this be
> > possible
> > > > to
> > > > > > > start
> > > > > > > a RMI server/Socket Server with this extra line
> and let the
> > > > appliation
> > > > > > > client connect to that, get the OpenCms Object
> and work with
> > > > > > > the singleton OpenCms
> > > > > > > instance.
> > > > > > >
> > > > > > > If more then one client applications would connect like
> > > > > > > that,
> > would
> > > > > > > this way
> > > > > > > of accessing still ensure that each client sees the same
> > > > > > > (files,
> > > > users,
> > > > > > > etc)?
> > > > > > >
> > > > > > > Another question based on the fact that I would
> accept the
> > > > > > > fact
> > that
> > > > > > > OpenCMS
> > > > > > > starts the application. Could this line:
> > > > > > >
> > > > > > > // added by myself
> > > > > > > opencms.addons.CmsWrapper.setOpenCms(m_opencms);
> > > > > > > // end added by myself
> > > > > > >
> > > > > > > be extended to start a number of appliations (Wrappers)
> > > > simultaniously
> > > > > > > (i.e.
> > > > > > > as Threads). Would this still ensure that each
> application
> > > > > > > would
> > see
> > > > > > > the
> > > > > > > same OpenCMS instance with the same changes made
> by others
> > > > > > > (i.e.
> > > > users,
> > > > > > > files,
> > > > > > > tasks...)?
> > > > > > >
> > > > > > > Cheers,
> > > > > > > Ralf
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > Ralf Bierig wrote:
> > > > > > > > > Hello Matt,
> > > > > > > > >
> > > > > > > > > thank you again for you competent answer.
> > > > > > > > >
> > > > > > > > > Do you agree that this solution should not have side
> > effects,
> > if
> > > > > > > the
> > > > > > > > only
> > > > > > > > > user would be this Java programm and there would NO
> > > > > > > > > OTHER
> > user
> > > > > > > logged in
> > > > > > > > via
> > > > > > > > > HTTP/Tomcat?
> > > > > > > >
> > > > > > > > I think that should be okay. wouter's method is probably
> > better,
> > > > > > > though
> > > > > > > > -- esp. if you were planning on using RMI anyway.
> > > > > > > >
> > > > > > > > Matt
> > > > > > > >
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