Keep track of ScriptSessions for one browser

[kape]

Is there a way to send back information to only one browser even though multiple browsers are on the given page?

My problem is that I have multiple users logged in accessing their data.  If there is an update for any given user, I don't want it to be sent to all users currently logged in.

I saw a post on how to deal with this if the thread is started by DWR, but in my case it isn't.  Also, in the javadoc there is mention of getScriptSession(String id) but I can't find the method anywhere.  Maybe I could use this to determine which ScriptSession I need to send updates to.

Thanks,

Erlend

[XMaNIaC]

I think that we need a FAQ somewhere because this has been answered hundreds of times by now

On Wed, May 7, 2008 at 10:39 PM, Erlend Sobec <erlend.sobec@...> wrote:

Is there a way to send back information to only one browser even though multiple browsers are on the given page?

My problem is that I have multiple users logged in accessing their data.  If there is an update for any given user, I don't want it to be sent to all users currently logged in.

I saw a post on how to deal with this if the thread is started by DWR, but in my case it isn't.  Also, in the javadoc there is mention of getScriptSession(String id) but I can't find the method anywhere.  Maybe I could use this to determine which ScriptSession I need to send updates to.

Thanks,

Erlend

[kape]

If this question has been asked so many times, I agree that it should definitely be in the FAQ.  However, since it isn't, perhaps you could tell me where I can find the answer rather than just tell me that it's been answered.  I did search and only found the solution for threads started by DWR, but in my case, the thread is NOT started by DWR so I can't just use WebContextFactory.get().getScriptSession().

Also, I asked where I can find info about the function getScriptSession(String id).  Has that also been answered?  If so where?

Thanks,

Erlend

On Wed, May 8, 2008 at 9:53 AM, Jose Noheda <jose.noheda@...> wrote:

> I think that we need a FAQ somewhere because this has been answered hundreds
> of times by now
> 
> On Wed, May 7, 2008 at 10:39 PM, Erlend Sobec <erlend.sobec@...> wrote:

> 
> > Is there a way to send back information to only one browser even though
> > multiple browsers are on the given page?
> >
> > My problem is that I have multiple users logged in accessing their data.

> > If there is an update for any given user, I don't want it to be sent to all
> > users currently logged in.
> >
> > I saw a post on how to deal with this if the thread is started by DWR, but

> > in my case it isn't.  Also, in the javadoc there is mention of
> > getScriptSession(String id) but I can't find the method anywhere.  Maybe I
> > could use this to determine which ScriptSession I need to send updates to.

> >
> > Thanks,
> >
> > Erlend
> >

[Lance Java]

One solution is to implement your own script session manager which intercepts script session creation, adding attributes to the script session based on the http session.

Later on, a reverse ajax thread can then differentiate between script sessions by their attributes.

<servlet>
    <servlet-name>dwr-invoker</servlet-name>
    <display-name>DWR Servlet</display-name>
    <description>Direct Web Remoter Servlet</description>
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
    <init-param>
        <param-name>org.directwebremoting.extend.ScriptSessionManager</param-name>
        <param-value>foo.bar.MyScriptSessionManager</param-value>
    </init-param>
</servlet>

Not sure about looking up a script session by id... what's your use case?

Cheers,
Lance.

2008/5/8 Erlend Sobec <erlend.sobec@...>:

If this question has been asked so many times, I agree that it should definitely be in the FAQ.  However, since it isn't, perhaps you could tell me where I can find the answer rather than just tell me that it's been answered.  I did search and only found the solution for threads started by DWR, but in my case, the thread is NOT started by DWR so I can't just use WebContextFactory.get().getScriptSession().

Also, I asked where I can find info about the function getScriptSession(String id).  Has that also been answered?  If so where?

Thanks,

Erlend

On Wed, May 8, 2008 at 9:53 AM, Jose Noheda <jose.noheda@...> wrote:

> I think that we need a FAQ somewhere because this has been answered hundreds
> of times by now
> 
> On Wed, May 7, 2008 at 10:39 PM, Erlend Sobec <erlend.sobec@...> wrote:


> 
> > Is there a way to send back information to only one browser even though
> > multiple browsers are on the given page?
> >
> > My problem is that I have multiple users logged in accessing their data.


> > If there is an update for any given user, I don't want it to be sent to all
> > users currently logged in.
> >
> > I saw a post on how to deal with this if the thread is started by DWR, but


> > in my case it isn't.  Also, in the javadoc there is mention of
> > getScriptSession(String id) but I can't find the method anywhere.  Maybe I
> > could use this to determine which ScriptSession I need to send updates to.


> >
> > Thanks,
> >
> > Erlend
> >

[XMaNIaC]

getScriptSessionById is a method of ServerContext. Here's the javadoc (from 3.0 HEAD)

getScriptSessionById

ScriptSession getScriptSessionById(java.lang.String sessionId)

You can request access to a specific ScriptSession if you know it's ID.

Take care with this method because it allows actions from one browser to affect another which could be a bad thing. It is certainly a VERY BAD idea to let session id's from one browser escape into another.

Consider that it is entirely possible that the ScriptSession may timeout while you are holding a reference to it.

Parameters:

sessionId - The script session ID to lookup

Returns:

The ScriptSession for the given ID, or null if it does not exist

On Thu, May 8, 2008 at 4:18 PM, Lance Java <lance.java@...> wrote:

One solution is to implement your own script session manager which intercepts script session creation, adding attributes to the script session based on the http session.

Later on, a reverse ajax thread can then differentiate between script sessions by their attributes.

<servlet>
    <servlet-name>dwr-invoker</servlet-name>
    <display-name>DWR Servlet</display-name>
    <description>Direct Web Remoter Servlet</description>
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
    <init-param>
        <param-name>org.directwebremoting.extend.ScriptSessionManager</param-name>
        <param-value>foo.bar.MyScriptSessionManager</param-value>
    </init-param>
</servlet>

Not sure about looking up a script session by id... what's your use case?

Cheers,
Lance.

2008/5/8 Erlend Sobec <erlend.sobec@...>:

If this question has been asked so many times, I agree that it should definitely be in the FAQ.  However, since it isn't, perhaps you could tell me where I can find the answer rather than just tell me that it's been answered.  I did search and only found the solution for threads started by DWR, but in my case, the thread is NOT started by DWR so I can't just use WebContextFactory.get().getScriptSession().

Also, I asked where I can find info about the function getScriptSession(String id).  Has that also been answered?  If so where?

Thanks,

Erlend

On Wed, May 8, 2008 at 9:53 AM, Jose Noheda <jose.noheda@...> wrote:

> I think that we need a FAQ somewhere because this has been answered hundreds
> of times by now
> 
> On Wed, May 7, 2008 at 10:39 PM, Erlend Sobec <erlend.sobec@...> wrote:



> 
> > Is there a way to send back information to only one browser even though
> > multiple browsers are on the given page?
> >
> > My problem is that I have multiple users logged in accessing their data.



> > If there is an update for any given user, I don't want it to be sent to all
> > users currently logged in.
> >
> > I saw a post on how to deal with this if the thread is started by DWR, but



> > in my case it isn't.  Also, in the javadoc there is mention of
> > getScriptSession(String id) but I can't find the method anywhere.  Maybe I
> > could use this to determine which ScriptSession I need to send updates to.



> >
> > Thanks,
> >
> > Erlend
> >