Re: [OT] JMS-like event framework for Perl
* Michael A. Nachbaur ([EMAIL PROTECTED]) [010310 14:25]: Since today seems to be "The Day of the Off Topic(tm)", I thought I'd jump in with my question. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). I could probably implement something like this to finish my project, but I'd rather not do a one-off. Does anyone know of anything that can accomodate this functionality? If I'm the first one trying to modularize this, what features would you like to see? Hi Michael, Just to put another 2 cents in -- I have this exact same idea and interest. I setup a project on Sourceforge for it (sourceforge.net/projects/perlmq/) but haven't been able to put together an initial ideas document yet. (Real life intrudes.) JMS seems to me a good model to follow as well. Why not use all that hard work lots of people have already done? :-) My initial thoughts were to base both the client and server around POE. Messages would be standard objects but would have different types of payloads: scalar, hash, array, object, XML document. SOAP would be another way to request/send messages as well. There is a mailing list on the sourceforge site to which we can move all this discussion, if you'd like. (That way it will all be archived in one place :-) Thanks! Chris -- Chris Winters ([EMAIL PROTECTED]) Building enterprise-capable snack solutions since 1988.
Re: [OT] JMS-like event framework for Perl
could be both another thread in client's process, and separate process that is running on the same (or even separate) machine, and client doesn't need to keep process up and running all the time. The thing that would be interesting to me is a more detailed description of what is needed. What features of JMS specifically are interesting to the original poster. Perhaps a project written on top of SOAP::Lite or POE would be in order. Or perhaps maybe the problem is just simpler than it's made out to be by asking for JMS features. I'm also not sure that that's something user asked about, but at least it's something I'm working on :)) and it looks similar to what was discussed. Any comments, ideas, thoughts? Best wishes, Paul. Date: Sun, 11 Mar 2001 15:24:30 +0800 From: Gunther Birznieks [EMAIL PROTECTED] Subject: Re: [OT] JMS-like event framework for Perl Although SOAP::Lite interfaces with SMTP and POP3, I don't know if SOAP::Lite really qualifies to be in the same class as products like JMS, Neon, or Microsoft MSMQ. However, I think the description of what the author is interested in is a bit vague. The words seem to indicate that he would be satisfied by setting up a SOAP service on an HTTP server that listens to calls made to it (the events) and then runs. This is a simpler model and does not really describe publish/subscribe as being a feature he wants. That is, to me, IMHO ... Publish/subscribe entails a lot of headaches about allowing multiple subscribers (consumers of data), maintaining the integrity of those messages, and making sure that all subscribers have a fair chance to get them. In larger environments the idea behind messaging is that you sacrifice speed for reliability of having a central queueing mechanism that may or may not be backed up by a persistent storage and that can notify clients that are subscribed in sort-of real time that a new message exists on the queue (without having to poll). And it doesn't sound like this user needs that. Also has not made clear what the relationship is between the event-driven objects. If the client is always requesting from the server or if the server needs to "call back" to the client to notify the client that something has occured. The former is obvious and easy with SOAP while the later is somewhat less trivial. POE seems more interesting, but is also not precisely publish/subscribe. It seems a bit more generic than that. Again, not quite the same as JMS, but something like it could be built from POE it seems. The thing that would be interesting to me is a more detailed description of what is needed. What features of JMS specifically are interesting to the original poster. Perhaps a project written on top of SOAP::Lite or POE would be in order. Or perhaps maybe the problem is just simpler than it's made out to be by asking for JMS features. At 09:25 AM 3/11/2001 +1300, Nathan Torkington wrote: jeff saenz wrote: Might be possible that soap is addressing messaging issues. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). You're right, SOAP::Lite can do these things (and more). I was hallucinating, thinking that you wanted to write a program in an event-driven style. http://www.soaplite.com/ http://guide.soaplite.com/ Nat __ Gunther Birznieks ([EMAIL PROTECTED]) eXtropia - The Web Technology Company http://www.extropia.com/ __ Do You Yahoo!? Yahoo! Auctions - Buy the things you want at great prices. http://auctions.yahoo.com/
Re: [OT] JMS-like event framework for Perl
On Sat, 10 Mar 2001, Michael A. Nachbaur wrote: Since today seems to be "The Day of the Off Topic(tm)", I thought I'd jump in with my question. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). POE works a bit like this. -- Matt/ /||** Founder and CTO ** ** http://axkit.com/ ** //||** AxKit.com Ltd ** ** XML Application Serving ** // ||** http://axkit.org ** ** XSLT, XPathScript, XSP ** // \\| // ** mod_perl news and resources: http://take23.org ** \\// //\\ // \\
Re: [OT] JMS-like event framework for Perl
"Michael A. Nachbaur" wrote: Since today seems to be "The Day of the Off Topic(tm)", I thought I'd jump in with my question. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). I think there's an Event.pm, but you're probably after something like POE: http://www.perl.com/pub/2001/01/poe.html - intro and tutorial http://poe.perl.org/ - homepage (down?) http://poe.dyndns.org/ - Rocco's dialin machine Nat
Re: [OT] JMS-like event framework for Perl
Might be possible that soap is addressing messaging issues. Nathan Torkington wrote: "Michael A. Nachbaur" wrote: Since today seems to be "The Day of the Off Topic(tm)", I thought I'd jump in with my question. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). I think there's an Event.pm, but you're probably after something like POE: http://www.perl.com/pub/2001/01/poe.html - intro and tutorial http://poe.perl.org/ - homepage (down?) http://poe.dyndns.org/ - Rocco's dialin machine Nat -- Perl/Linux/Java Development Resume: http://resumes.yahoo.com/undertheash/perljavalinux
Re: [OT] JMS-like event framework for Perl
jeff saenz wrote: Might be possible that soap is addressing messaging issues. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). You're right, SOAP::Lite can do these things (and more). I was hallucinating, thinking that you wanted to write a program in an event-driven style. http://www.soaplite.com/ http://guide.soaplite.com/ Nat
Re: [OT] JMS-like event framework for Perl
Although SOAP::Lite interfaces with SMTP and POP3, I don't know if SOAP::Lite really qualifies to be in the same class as products like JMS, Neon, or Microsoft MSMQ. However, I think the description of what the author is interested in is a bit vague. The words seem to indicate that he would be satisfied by setting up a SOAP service on an HTTP server that listens to calls made to it (the events) and then runs. This is a simpler model and does not really describe publish/subscribe as being a feature he wants. That is, to me, IMHO ... Publish/subscribe entails a lot of headaches about allowing multiple subscribers (consumers of data), maintaining the integrity of those messages, and making sure that all subscribers have a fair chance to get them. In larger environments the idea behind messaging is that you sacrifice speed for reliability of having a central queueing mechanism that may or may not be backed up by a persistent storage and that can notify clients that are subscribed in sort-of real time that a new message exists on the queue (without having to poll). And it doesn't sound like this user needs that. Also has not made clear what the relationship is between the event-driven objects. If the client is always requesting from the server or if the server needs to "call back" to the client to notify the client that something has occured. The former is obvious and easy with SOAP while the later is somewhat less trivial. POE seems more interesting, but is also not precisely publish/subscribe. It seems a bit more generic than that. Again, not quite the same as JMS, but something like it could be built from POE it seems. The thing that would be interesting to me is a more detailed description of what is needed. What features of JMS specifically are interesting to the original poster. Perhaps a project written on top of SOAP::Lite or POE would be in order. Or perhaps maybe the problem is just simpler than it's made out to be by asking for JMS features. At 09:25 AM 3/11/2001 +1300, Nathan Torkington wrote: jeff saenz wrote: Might be possible that soap is addressing messaging issues. Is there a event messaging framework available for Perl, similar to JMS? I'd like to be able to have an object registered as a handler for certain "events", and have perl code throw those events causing the object to be run automatically (publish / subscribe model). You're right, SOAP::Lite can do these things (and more). I was hallucinating, thinking that you wanted to write a program in an event-driven style. http://www.soaplite.com/ http://guide.soaplite.com/ Nat __ Gunther Birznieks ([EMAIL PROTECTED]) eXtropia - The Web Technology Company http://www.extropia.com/
