Creating a custom session manager 2007-01-09 - By Bryan Basham
Back
Hello Tomcat users,
I have a need that I believe Tomcat's pluggable session manager
facility can satisfy, but I am having trouble getting it configured.
BTW, I have googled and searched the mail archives on this topic
and have not found anything useful yet.
My application requires a modular architecture in which pluggable
modules can be added a removed. We would like to use the web
container's ability to deploy, undeploy, and redeploy WAR files as
a means to install, uninstall, and upgrade the modules within our
system. However, there is also a need to share session state between
these modules which is not allowed in the servlet specification.
I have researched a few solutions (such as using a Singleton in a
common/lib/ package), but these solutions appear to require a non-
trivial amount of infrastructure (and configuration of filters and/or
session listeners) for every webapp. I would like to avoid all of that
explicit infrastructure and hide the complexity by using a custom
session manager.
Before I proceed with my question, does anyone have any other
suggestions for solving the above problem?
OK, here is the test case that I am trying. I have created a very simple
decorator which implements the org.apache.catalina.Manager  interface.
It simply delegates all calls to an instance of StandardManager and
prints a message to System.out. Attached is the Tomcat config file
that I am trying to use to configure my custom session manager. I am
trying to use the <DefaultContext> tag to setup the manager on all
webapps.
Unfortunately, when I run a simple webapp (after restarting Tomcat, of
course) I am not seeing any output in any log file (nor to the console) from
my test manager.
Is my configuration invalid? What am I missing?
Sincere thanks,
Bryan
--
*StillSecure*
Bryan Basham
Senior Software Engineer (UI Development)
F 303.381.3881
C 303.917.4546
www.stillsecure.com <http://www.stillsecure.com>
/The information transmitted is intended only for the person
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Hello Tomcat users,<br>
<br>
I have a need that I believe Tomcat's pluggable session manager<br>
facility can satisfy, but I am having trouble getting it configured.<br>
<br>
BTW, I have googled and searched the mail archives on this topic<br>
and have not found anything useful yet.<br>
<br>
My application requires a modular architecture in which pluggable<br>
modules can be added a removed. We would like to use the web<br>
container's ability to deploy, undeploy, and redeploy WAR files as<br>
a means to install, uninstall, and upgrade the modules within our<br>
system. However, there is also a need to share session state between<br>
these modules which is not allowed in the servlet specification.<br>
<br>
I have researched a few solutions (such as using a Singleton in a<br>
common/lib/ package), but these solutions appear to require a non-<br>
trivial amount of infrastructure (and configuration of filters and/or<br>
session listeners) for every webapp. I would like to avoid all of that<br>
explicit infrastructure and hide the complexity by using a custom<br>
session manager.<br>
<br>
Before I proceed with my question, does anyone have any other<br>
suggestions for solving the above problem?<br>
<br>
OK, here is the test case that I am trying. I have created a very
simple<br>
decorator which implements the org.apache.catalina.Manager interface.<br>
It simply delegates all calls to an instance of StandardManager and<br>
prints a message to System.out. Attached is the Tomcat config file<br>
that I am trying to use to configure my custom session manager. I am<br>
trying to use the <DefaultContext> tag to setup the manager on all<br>
webapps.<br>
<br>
Unfortunately, when I run a simple webapp (after restarting Tomcat, of<br>
course) I am not seeing any output in any log file (nor to the console)
from<br>
my test manager.<br>
<br>
Is my configuration invalid? What am I missing?<br>
<br>
Sincere thanks,<br>
Bryan<br>
<br>
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<p><font color="#000000" face="verdana, arial, sans serif" size="1"><strong
>StillSecure</strong></font><br>
<font color="#000000" face="verdana, arial, sans serif" size="1">Bryan
Basham<br>
Senior Software Engineer (UI Development)<br>
<br>
<font color="#ff8000">F</font> 303.381.3881<br>
<font color="#ff8000">C</font> 303.917.4546<br>
</font> <font color="#666666" face="verdana, arial, sans serif"
size="1"><a href="http://www.stillsecure.com">www.stillsecure.com</a></font>
<font
color="#006633" face="verdana, arial, sans serif" size="1"><br>
</font> <font color="#666666" face="verdana, arial, sans serif"
size="1"><i>The information transmitted is intended only for the person<br>
to whom it is addressed and may contain confidential material.<br>
Review or other use of this information by persons other than<br>
the intended recipient is prohibited. If you've received<br>
this in error, please contact the sender and delete<br>
from any computer.
</i></font></p>
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