AW: AW: Tomcat 5.5 Cluster: Session Replication before sending the response 2007-01-16 - By Andy.Scherzinger@(protected)
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Hi Filip,
I understand that I will just change the session in a way the delta manager
will replicate everything.
But is there no other Manager I can use which just replicates the complete
session and not just the changed data (like the DeltaManager does)?!
I couldn't find a Manager which replicates everything. Is there one?
Thanks in advance!
Andy
-- --Urspr?ngliche Nachricht-- --
Von: Filip Hanik - Dev Lists [mailto:devlists@(protected)]
Gesendet: Dienstag, 16. Januar 2007 15:35
An: Tomcat Users List
Betreff: Re: AW: Tomcat 5.5 Cluster: Session Replication before sending the
response
even with this method, you are not managing the sessions, you're just making
sure that everything gets replicated, so doing this, you are not changing the
session manager.
remember, the code below would be inserted into a filter or a valve
Filip
wrote:
> Hi Filip,
>
> Thanks for your answer. I also thought about this solution of just setting
all objects again at the end of the doGet method.
> But if possible I would like to use a tomcat replication mechanism
> since I do not want to "manage" session since I have a tomcat-built-in
> session manager :)
>
> Andy
>
> -- --Urspr?ngliche Nachricht-- --
> Von: Filip Hanik - Dev Lists [mailto:devlists@(protected)]
> Gesendet: Mittwoch, 10. Januar 2007 16:52
> An: Tomcat Users List
> Betreff: Re: Tomcat 5.5 Cluster: Session Replication before sending
> the response
>
> to achieve what you want, although slower, you can create a filter,
> and in that filter simply set all the attributes again
>
> Enumeration e = session.getAttributeNames(); while ( e.hasNext() ) {
> String name = e.next();
> Object value = session.getAttribute(name);
> if ( value != null ) session.setAttribute(name,value); }
>
> you get the point :)
>
> Filip
>
> wrote:
>
>> Hi everybody,
>>
>> I have a Tomcat 5.5 cluster with 2 nodes on SLES8 and want to replicate the
complete session before the response is send. According to the Tomcat
Clustering documentation the example with the DeltaManager does this since the
ReplicationValve triggers the replication after the request has been processed
and before the response is sent.
>>
>> Unfortunately the DeltaManager only replicates the changed data. Only
changes made by using methods like setAttribute make changes visible to the
DeltaManager and changes made to the object (like changing one field value noch
setAttribute-call) do not.
>> Thus I would need to change the way these objects are handled in the
application. So I thought it would be the easiest way to just replicate the
complete session instead of changes only. Is this possible?
>>
>> JavaDoc of org.apache.catalina.session.StandardManager  :
>> "Standard implementation of the Manager interface that provides simple
session persistence across restarts of this component (such as when the entire
server is shut down and restarted, or when a particular web application is
reloaded."
>>
>> This sounds like the session is only replicated when the server ist shutdown
/restarted/app reloaded. It also doesn't specify what is replicated - the
complete session?
>>
>> Any suggestions?
>>
>> Thanks in advance
>> --Andy
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