RE: Enumerating sessions
It does, thank you. I was just starting to come to the same basic approach on my own, you verified it's probably the right way to go. Fortunately I already store the sessionID in my user table (for debugging purposes of a previous problem, but I just left it in). So now I just have to add the listener and I should get what I want. For the broadcast messages requirement, I was trying to figure out how to access all the sessions to add a message attribute to it that I could check on the next request, but that doesn't seem to be possible. Fortunately, it's also not necassery... because my Actions all make use of a helper class, and the first thing they all do is call a special startAction() method, I can just check my static app config object, which is where I will put the broadcast message, and return it with whatever the request is. Just need to implement a JavaScript popup on the client if the message is found in the response, and I'm all set. I could probably even do this as some sort of filter instead, but since I already have the helper there (it's an artifact of the app being converted from an old custom framework), it's a good place for it. Thanks a bunch guys! Frank From: "Van Riper, Mike" <[EMAIL PROTECTED]> Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> To: "'Struts Users Mailing List'" <[EMAIL PROTECTED]> Subject: RE: Enumerating sessions Date: Tue, 15 Jun 2004 13:57:54 -0700 I had to do something like this and I did use the HttpSessionListener interface (requires 2.3 servlet API support in your container) as part of the solution. However, it alone is not sufficient. The callbacks for the session creation and destruction events happen so early and so late respectively that you do not have access to any session data other than the sessionID. The solution I came up with was to record logins within the webapp to a tracking table *and* store the sessionID as a field in these records. Then, you can use the sessionDestroyed() callback to check to see if there is a login record that is still active that needs to be flagged as terminated. You have to go through all these hoops because you can't rely on the user explicitly logging out. So, to update the tracking table to reliably indicate who is currently logged in you have to do this. You will hit the sessionDestroyed() callback whether they explicitly log out and you expire the session, or the session simply times out on its own because of inactivity (or as a result of closing the client-side browser window without explicitly logging out). Hope this helps, Van Mike "Van" Riper Silicon Valley Struts User Group http://www.baychi.org/bof/struts/ mailto:[EMAIL PROTECTED] > -Original Message- > From: Nick Heudecker [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 15, 2004 1:43 PM > To: Struts Users Mailing List > Subject: Re: Enumerating sessions > > > Wouldn't this do it? > > http://jakarta.apache.org/tomcat/tomcat-5.0-doc/servletapi/jav > ax/servlet/http/HttpSessionListener.html > > Frank Zammetti wrote: > > > Hello all... is there any good way to enumerate all > sessions under a > > given webapp? I know there used to be the SessionContext, > but that has > > since been deprecated as of servlet spec 2.1 I believe... Is there > > anything in Struts that might help? > > > > Basically I'm just looking for an accurate way to display > all currently > > logged on users, and also have the ability to add a session > attribute to > > all of them (think broadcast messages and forced graceful > logoffs). I > > keep hearing the term "Session Listenter", but my research > is turning up > > server-specific (or third party-specific references), and I > need this to > > be server-nuetral. > > > > I could I guess create a wrapper class that is called to > create or kill > > a session, as well as to add of remove attributes, but I'd prefer > > something that won't require me to change a lot of code, or > any really! > > > > Thanks in advance for any ideas! > > > > Frank > > > > _ > > MSN 9 Dial-up Internet Access fights spam and pop-ups now > 3 months > > FREE! http://join.msn.click-url.com/go/onm00200361ave/direct/01/ > > > > > > > - > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > -- > Nick Heudecker > System Mobile, Inc. > Email: [EMAIL PROTECTED] > Web: http://www.systemmobile.com > > --
RE: Enumerating sessions
I had to do something like this and I did use the HttpSessionListener interface (requires 2.3 servlet API support in your container) as part of the solution. However, it alone is not sufficient. The callbacks for the session creation and destruction events happen so early and so late respectively that you do not have access to any session data other than the sessionID. The solution I came up with was to record logins within the webapp to a tracking table *and* store the sessionID as a field in these records. Then, you can use the sessionDestroyed() callback to check to see if there is a login record that is still active that needs to be flagged as terminated. You have to go through all these hoops because you can't rely on the user explicitly logging out. So, to update the tracking table to reliably indicate who is currently logged in you have to do this. You will hit the sessionDestroyed() callback whether they explicitly log out and you expire the session, or the session simply times out on its own because of inactivity (or as a result of closing the client-side browser window without explicitly logging out). Hope this helps, Van Mike "Van" Riper Silicon Valley Struts User Group http://www.baychi.org/bof/struts/ mailto:[EMAIL PROTECTED] > -Original Message- > From: Nick Heudecker [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 15, 2004 1:43 PM > To: Struts Users Mailing List > Subject: Re: Enumerating sessions > > > Wouldn't this do it? > > http://jakarta.apache.org/tomcat/tomcat-5.0-doc/servletapi/jav > ax/servlet/http/HttpSessionListener.html > > Frank Zammetti wrote: > > > Hello all... is there any good way to enumerate all > sessions under a > > given webapp? I know there used to be the SessionContext, > but that has > > since been deprecated as of servlet spec 2.1 I believe... Is there > > anything in Struts that might help? > > > > Basically I'm just looking for an accurate way to display > all currently > > logged on users, and also have the ability to add a session > attribute to > > all of them (think broadcast messages and forced graceful > logoffs). I > > keep hearing the term "Session Listenter", but my research > is turning up > > server-specific (or third party-specific references), and I > need this to > > be server-nuetral. > > > > I could I guess create a wrapper class that is called to > create or kill > > a session, as well as to add of remove attributes, but I'd prefer > > something that won't require me to change a lot of code, or > any really! > > > > Thanks in advance for any ideas! > > > > Frank > > > > _ > > MSN 9 Dial-up Internet Access fights spam and pop-ups – now > 3 months > > FREE! http://join.msn.click-url.com/go/onm00200361ave/direct/01/ > > > > > > > - > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > -- > Nick Heudecker > System Mobile, Inc. > Email: [EMAIL PROTECTED] > Web: http://www.systemmobile.com > > - > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Enumerating sessions
Wouldn't this do it? http://jakarta.apache.org/tomcat/tomcat-5.0-doc/servletapi/javax/servlet/http/HttpSessionListener.html Frank Zammetti wrote: Hello all... is there any good way to enumerate all sessions under a given webapp? I know there used to be the SessionContext, but that has since been deprecated as of servlet spec 2.1 I believe... Is there anything in Struts that might help? Basically I'm just looking for an accurate way to display all currently logged on users, and also have the ability to add a session attribute to all of them (think broadcast messages and forced graceful logoffs). I keep hearing the term "Session Listenter", but my research is turning up server-specific (or third party-specific references), and I need this to be server-nuetral. I could I guess create a wrapper class that is called to create or kill a session, as well as to add of remove attributes, but I'd prefer something that won't require me to change a lot of code, or any really! Thanks in advance for any ideas! Frank _ MSN 9 Dial-up Internet Access fights spam and pop-ups – now 3 months FREE! http://join.msn.click-url.com/go/onm00200361ave/direct/01/ - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Nick Heudecker System Mobile, Inc. Email: [EMAIL PROTECTED] Web: http://www.systemmobile.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
