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From Remy Maucherat <>
Subject Re: Custom HttpSession passivation?
Date Fri, 03 Dec 2004 15:28:24 GMT
Jess Holle wrote:

> Remy Maucherat wrote:
>> Jess Holle wrote:
>>> I have a need to passivate HttpSessions on a more aggressive basis 
>>> than that of timing them out.
>>> Default behavior is to time out a sessions after 30 minutes of 
>>> inactivity -- which is fine.
>>> Rather I need to be able to passivate sessions to disk after say 
>>> 10-15 minutes or rather passivate all but the last 'n' (e.g. 200) to 
>>> disk -- re-activating these if/when necessary (i.e. when a request 
>>> comes in for the given session).
>>> Am I missing a configuration option for such behavior in Tomcat?  
>>> [Is this something SunONE or WebSphere add on top of the base code 
>>> they share with Tomcat?]
>>> If not, do APIs exist for:
>>>    * Passivation of individual sessions, i.e. serializing them to disk,
>>>      calling the right listeners, etc?
>>>    * Activation of individual sessions, i.e. re-storing them from disk,
>>>      cleaning files from disk as appropriate, calling the right
>>>      listeners, etc?
>>>          o Is this done automatically on attempts to access the session
>>>            in question?
>>> I'm using Tomcat 5.0.30 and 4.1.24, though I could limit things to 
>>> 5.0.30 if that helps.  [I could /possibly/ even pursue 5.5.x if that 
>>> helps enough, but there are significant obstacles to us pursuing 
>>> this direction at this time.] 
>> This is the purpose of the persistent manager, which supports a 
>> number of backends (JDBC and file, at the moment).
> Can you give me a brief summary of what is and is not there?  For 
> instance, I assume from your answer that there is no simple 
> configuration of "passivate after 15 minutes and auto-reactivate as 
> needed", true?  Is the auto-reactivate there?


> These may be stupid questions -- can you give a little more detailed 
> pointer, i.e. full class names and/or important method and pointers 
> any existing docs beyond Javadoc?

It's called persistent manager, and it's the same place as the standard 
manager, in the session package.
There's even docs:

> I can root around given the info given so far as well -- but a brief 
> high-level overview as to what's there already and where to begin 
> would be very helpful.
>> Note: We won't be accepting any contributions in this area for 4.1, 
>> and for 5.0, it is unlikely too.
> Thanks for the note.  Did this area change much between 4.1 and 5.0?  
> If not, then I could consider doing something against 5.0 and porting 
> to 5.5 as a contribution.  If this area changed significantly, then I 
> may need to consider whether I can just do this once against 5.5 
> rather having to do this against 5.0 and then rework it for 5.5. 

It changed a little, but not too much.


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