Re: Equivalent of Resin run-at servlet configuration
I'm not a Tomcat developer, I'm an outside observer too, but I agree with Tim. If you want such a feature, I think you have to implement such a package, which could be an optional additional package for Tomcat (like the apache commons packages, ... or other), and, why not, available in a tomcat add-ons site (just a thought too)... Your solution or the Jonathan Wilson's solution could be an issue ... if you run your webapp on a single tomcat. But if you run it on a cluster, perhaps you don't want your servlet running (at xx:yy) on each node; only on one node... For this need, a daemon will be better if you need to run your servlet run-at only once per webapp... For this reason, even if a lot of developpers need such a feature, I think Tomcat has nothing to implement for this : it is a servlet container, not a full J2EE container. On Thu, 3 Mar 2005 22:28:41 -0500 Parsons Technical Services [EMAIL PROTECTED] wrote: And so the best way is to have a set of classes to add to your project that add this feature. It then moves with the app and can be applied per app or even as a jar in common lib for use by all apps. Tim, am I thinking right on this? Remember that Tomcat follows the spec which is developed and created by others. So impossible is not an accurate statement. Anything is possible. But this is not the forum to lobby. Tomcat nor Apache are the creators of the spec. They only follow it. Now if you want to lobby these folks, fell free to. You never know, it may be something that is being considered and another voice may help. As for Tomcat if you start adding things that are not spec driven you open yourself up for controversy and problems down the road. Just trying to follow the spec can be a pain in itself, for each creator of a container will interpret some areas differently. Knowing that you app will run on any container because the container you run on follows the spec can be a big load off a developers mind. Although I am not one of the developers working on Tomcat, I think this is why you are seeing some of the changes that have occurred in the last year. Tomcat is moving away from non spec features and trying to tow a tighter line. NOTE: This is my opinion as an outside observer. I know the developers sound a little rude or abrupt, but remember that is many way their hands are tied. They are committed to building a reliable product that is widely accepted and compatible/comparable to other containers. To accomplish this they must do their best to follow the spec for failure to do so would result in just that, failure. I am sure there are tons of features and ideas that they would love to add, but can't because of the spec. I have spoke up, many times, in defense of the wonderful folks who spend so much of their time on Tomcat. I do this because it is one way that I can contribute back. I do this not to belittle you or anyone else, but to inform you and help you and others understand. These guys do a great job and I for one am very thankful. So if someone will write these classes, and someone will host them maybe we can get a link off the Tomcat in the FAQ section??? Just a thought. Doug - Original Message - From: Tim Funk [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 8:51 PM Subject: Re: Equivalent of Resin run-at servlet configuration run-at is an extension to web.xml that is not portable across containers. That's why it will not be implemented. -Tim Aris Javier wrote: No, meaning impossible? cause if it would be very beneficial to many then why not change the specs to accommodate such service? Pardon me, maybe because I really don't understand the specs. I was just thinking in a layman's way. Thanks Aris -Original Message- From: Tim Funk [mailto:[EMAIL PROTECTED] Sent: Friday, March 04, 2005 9:42 AM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration no. (unless the spec says so) -Tim Aris Javier wrote: If this is not supported in Tomcat, is there a way or a plan to have this kind of service? This would really be a big help to many developers. Just a thought Aris -Original Message- From: David Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, March 03, 2005 9:34 PM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have
Re: Equivalent of Resin run-at servlet configuration
yup -Tim Parsons Technical Services wrote: And so the best way is to have a set of classes to add to your project that add this feature. It then moves with the app and can be applied per app or even as a jar in common lib for use by all apps. Tim, am I thinking right on this? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Equivalent of Resin run-at servlet configuration
Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. Thanks, Subbu. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Equivalent of Resin run-at servlet configuration
AFAIK Tomcat dont provide a replacement for this. It is not in Servlet spec. Search in archives as it was asked a few weeks before. rgds Antony Paul On Thu, 3 Mar 2005 16:45:24 +0530 (IST), Subramanya Sastry [EMAIL PROTECTED] wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. Thanks, Subbu. - 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: Equivalent of Resin run-at servlet configuration
: I am developing a Java web application, and one of the requirements is to run : a particular servlet periodically, or even at specified times. Resin provides : this ability via its run-at configuration element for servlets in web.xml Tomcat doesn't have this. Are you trying to run that particular servlet, or just the business logic called by that servlet? Look into a scheduler (such as Quartz) to call that business logic for you at given times. You could also use Java's builtin TimerTask class, but (IIRC) that takes a Runnable or a Thread, so it's up to you to make sure those threads are properly terminated at container shutdown. Tomcat won't do that for you. -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Equivalent of Resin run-at servlet configuration
Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Equivalent of Resin run-at servlet configuration
With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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: Equivalent of Resin run-at servlet configuration
I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Equivalent of Resin run-at servlet configuration
I think that what you want, with this feature, is a daemon (but not a servlet that respond to requests). So, Tomcat don't have to implement anything for this (it's not in its sphere of activities). I think that crons (eventually with httpclients), TimerTasks, ... are more usefull for this need... On Thu, 3 Mar 2005 08:27:46 -0500 Parsons Technical Services [EMAIL PROTECTED] wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Equivalent of Resin run-at servlet configuration
Well, I use a servlet that is kicked off at container start(On TC 3.x used load-on-startup attribute, TC 5.x+ there is something else which is now part of the J2EE spec). Most other containers have a load-on-startup type attribute available to them. When that servlet is init()ed at container start I kick off a class which loads more class names out of the web.xml that are Runnable. This parent class then kicks off a thread for each Runnable, and handles making sure they are all reaped when the destroy() method of the servlet is called(usually at container shutdown). There are better ways of doing this now with the newer TC's. If you don't shutdown your child threads, there may be a possibility that they will remain running after TC stops. Good luck. -JW Lionel Farbos wrote: I think that what you want, with this feature, is a daemon (but not a servlet that respond to requests). So, Tomcat don't have to implement anything for this (it's not in its sphere of activities). I think that crons (eventually with httpclients), TimerTasks, ... are more usefull for this need... On Thu, 3 Mar 2005 08:27:46 -0500 Parsons Technical Services [EMAIL PROTECTED] wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Equivalent of Resin run-at servlet configuration
If this is not supported in Tomcat, is there a way or a plan to have this kind of service? This would really be a big help to many developers. Just a thought Aris -Original Message- From: David Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, March 03, 2005 9:34 PM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - 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: Equivalent of Resin run-at servlet configuration
no. (unless the spec says so) -Tim Aris Javier wrote: If this is not supported in Tomcat, is there a way or a plan to have this kind of service? This would really be a big help to many developers. Just a thought Aris -Original Message- From: David Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, March 03, 2005 9:34 PM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - 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] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Equivalent of Resin run-at servlet configuration
No, meaning impossible? cause if it would be very beneficial to many then why not change the specs to accommodate such service? Pardon me, maybe because I really don't understand the specs. I was just thinking in a layman's way. Thanks Aris -Original Message- From: Tim Funk [mailto:[EMAIL PROTECTED] Sent: Friday, March 04, 2005 9:42 AM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration no. (unless the spec says so) -Tim Aris Javier wrote: If this is not supported in Tomcat, is there a way or a plan to have this kind of service? This would really be a big help to many developers. Just a thought Aris -Original Message- From: David Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, March 03, 2005 9:34 PM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - 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] - 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: Equivalent of Resin run-at servlet configuration
run-at is an extension to web.xml that is not portable across containers. That's why it will not be implemented. -Tim Aris Javier wrote: No, meaning impossible? cause if it would be very beneficial to many then why not change the specs to accommodate such service? Pardon me, maybe because I really don't understand the specs. I was just thinking in a layman's way. Thanks Aris -Original Message- From: Tim Funk [mailto:[EMAIL PROTECTED] Sent: Friday, March 04, 2005 9:42 AM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration no. (unless the spec says so) -Tim Aris Javier wrote: If this is not supported in Tomcat, is there a way or a plan to have this kind of service? This would really be a big help to many developers. Just a thought Aris -Original Message- From: David Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, March 03, 2005 9:34 PM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So, any pointers as to how I could achieve this for Tomcat would be appreciated. There is none and shouldn't be any. I understand the need to run periodical tasks, but J2EE specification, prior to 1.4 has no such provisions. Further, Servlet/JSP specification has no such provision, even in J2EE 1.4. You'd be best advised to setup a cron-job to perform this periodic activity. There are several good HTTP client packages out there, Jakarta-Commons HTTPclient, to name one, that will help you in building the client side of your cron-job. Nix. - 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] - 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] - 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] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Equivalent of Resin run-at servlet configuration
And so the best way is to have a set of classes to add to your project that add this feature. It then moves with the app and can be applied per app or even as a jar in common lib for use by all apps. Tim, am I thinking right on this? Remember that Tomcat follows the spec which is developed and created by others. So impossible is not an accurate statement. Anything is possible. But this is not the forum to lobby. Tomcat nor Apache are the creators of the spec. They only follow it. Now if you want to lobby these folks, fell free to. You never know, it may be something that is being considered and another voice may help. As for Tomcat if you start adding things that are not spec driven you open yourself up for controversy and problems down the road. Just trying to follow the spec can be a pain in itself, for each creator of a container will interpret some areas differently. Knowing that you app will run on any container because the container you run on follows the spec can be a big load off a developers mind. Although I am not one of the developers working on Tomcat, I think this is why you are seeing some of the changes that have occurred in the last year. Tomcat is moving away from non spec features and trying to tow a tighter line. NOTE: This is my opinion as an outside observer. I know the developers sound a little rude or abrupt, but remember that is many way their hands are tied. They are committed to building a reliable product that is widely accepted and compatible/comparable to other containers. To accomplish this they must do their best to follow the spec for failure to do so would result in just that, failure. I am sure there are tons of features and ideas that they would love to add, but can't because of the spec. I have spoke up, many times, in defense of the wonderful folks who spend so much of their time on Tomcat. I do this because it is one way that I can contribute back. I do this not to belittle you or anyone else, but to inform you and help you and others understand. These guys do a great job and I for one am very thankful. So if someone will write these classes, and someone will host them maybe we can get a link off the Tomcat in the FAQ section??? Just a thought. Doug - Original Message - From: Tim Funk [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 8:51 PM Subject: Re: Equivalent of Resin run-at servlet configuration run-at is an extension to web.xml that is not portable across containers. That's why it will not be implemented. -Tim Aris Javier wrote: No, meaning impossible? cause if it would be very beneficial to many then why not change the specs to accommodate such service? Pardon me, maybe because I really don't understand the specs. I was just thinking in a layman's way. Thanks Aris -Original Message- From: Tim Funk [mailto:[EMAIL PROTECTED] Sent: Friday, March 04, 2005 9:42 AM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration no. (unless the spec says so) -Tim Aris Javier wrote: If this is not supported in Tomcat, is there a way or a plan to have this kind of service? This would really be a big help to many developers. Just a thought Aris -Original Message- From: David Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, March 03, 2005 9:34 PM To: Tomcat Users List Subject: Re: Equivalent of Resin run-at servlet configuration I think the Cocoon project has such a facility. I'm not sure how complicated it would be to pull out that functionality, but their work might be worth looking at for this. --David Parsons Technical Services wrote: With all the questions and suggestions flying around, a question to the other programmers: If one was to write a class for the purpose of running classes at set times, what pitfalls would one need to watch for? I have a class that loads on startup and runs a continuous loop that is timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I know that it could be better. Any guidance or suggestions would be appreciated. And maybe we could create an add-on and post it for use in apps that need such a device. Thanks Doug - Original Message - From: Nikola Milutinovic [EMAIL PROTECTED] To: Tomcat Users List tomcat-user@jakarta.apache.org Sent: Thursday, March 03, 2005 6:55 AM Subject: Re: Equivalent of Resin run-at servlet configuration Subramanya Sastry wrote: Hello, I am developing a Java web application, and one of the requirements is to run a particular servlet periodically, or even at specified times. Resin provides this ability via its run-at configuration element for servlets in web.xml Example Resin configuration: servlet servlet-namedownload/servlet-name servlet-classDownloadNewsServlet/servlet-class run-at period='360m'/ /servlet However, I haven't found an equivalent configuration for Tomcat. I searched the web and was unsuccessful. So
