Re: [WebDNA] Timer
This WebDNA talk-list message is from 2009
It keeps the original formatting.
numero = 101741
interpreted = N
texte = I read more about triggers, they are tcp calls rather than internal calls, the software sends each request to dns which resolves the domain then redirects the request back to the server. I agree that timed precision is not possible via such a system. I read the description for the shell tag, there are no examples on the shell tag page at http://docs.webdna.us (only a long list of files) but if it works for changing ownership and permission that's one issue resolved. On 1/4/09, Terry Wilson
wrote: > Have you tried triggers? I have a web app that relies on triggers to > send emails out for a number of sites, and have never had any > problems. It is a Linux server. Just because a few people have > problems doesn't men you will too. It's easy enough to try it out in > your configuration. You will always hear about problems, but the ones > of us who use them routinely with success probably don't report that. > > Terry > >>Hi Chris, >> >>I do not mean to offend but I find no reports of "trigger bugs fixed" >>in the mail list archive. Instead I see several reports of failed >>triggers over a long time, including this post made just days ago: >> >>>> WebDNA Version 6 >>>> In the ISP Sandbox settings there are "Sandbox Options" >>>> for Emailer and Triggers. >>> >>> These are buggy in 6.0a so keep them checked on that >>> version. They should be fixed in the CICADA (6.1.x build) >>> but, I have yet to test the fix thoroughly. >> >>In this post Mr. Brooke seems to feel the bug may not yet be fixed >>even in the new version, thus I hesitate to trust triggers given the >>fact that timed event actions are mission critical for us. >> >>On 1/3/09, christophe.billiottet@webdna.us >> wrote: >>> A way to do that would be to add a "timestamp" to a small "witness >>> database" with only one record, any time the main database or the file >>> is updated (you must add a small [Replace] command to update the last >>> value). Then you can compare the last counter value with the last one >>> you had and send the response to your users. A WebDNA trigger should >>> be fine. >>> >>> You could also flag the event with just a "1" in your witness >>> database, then reset it to "0" each time you send the notification to >>> your users. >>> >>> You can also use the [FileInfo] and [ModTime] but it will not work >>> with the WebDNA database, since it is not written to disk. I guess >>> this would also be slower. >>> >>> There are many ways to do this. >>> >>> chris >>> >>> >>> >>> >>> On Jan 3, 2009, at 2:51, Jason Adams wrote: >>> >>>> Sorry for the delayed response, Christmas holidays and all. Happy New >>>> Year everyone! >>>> >>>> Dylan, after reading your response I think I need to explain in more >>>> detail. I need the software to check on the status of a database and a >>>> plain text file every few seconds. When the software detects that the >>>> database or the file has changed, it must send a response to all >>>> connected visitors. >>>> >>>> I'll be keeping connections open to these visitors for the sole >>>> purpose of sending them an update every few seconds. An update will be >>>> sent whether or not something has changed since the last update. This >>>> is necessary to keep visitors informed that they are still online and >>>> connected. >>>> >>>> I've read that triggers are buggy so I don't think I should rely on >>>> them until they are fixed. This checking and updating capability is >>>> absolutely critical to the application, so this may mean it should be >>>> done with cron. If this software can interface with cron and run cron >>>> events can someone post a code example to help me get started? >>>> >>>> I run Linux servers exclusively, and I could have hundreds of servers >>>> running this distributed online system at any given moment. They are >>>> generic servers, not all the same OS and not all the same hosts, so >>>> I'll need software that works on all of them. From what I've read it >>>> looks like the company is building such a new version for Linux so >>>> maybe this is good timing. >>>> >>>> ----------- >>>> Jason >>>> >>>> >>>> >>>> On 12/21/08, Dylan Wood wrote: >>>>> Jason- >>>>> >>>>> As long as the event your talking about yields some sort of evidence >>>>> that it occurred, you can use webdna to detect that. then trigger >>>>> your >>>>> own process whatever it may be. WebDNA can read files and folders, >>>>> so >>>>> if the event you are talking about impacts the file system, you >>>>> should >>>>> be able to detect it. >>>>> >>>>> On Dec 21, 2008, at 5:28 AM, Jason Adams wrote: >>>>> >>>>>> Hello I'm new here and new to WebDNA. Hoping to get some help from >>>>>> anyone who knows. Can WebDNA detect server events then send data to >>>>>> all logged in visitors incrementally? >>>>>> >>>>>> I may need to build a site that sends data from the server >>>>>> incrementally, every second or every few seconds, if it has changed >>>>>> since the last incrementing event. Wondering if WebDNA can do this? >>>>>> >>>>>> ----------- >>>>>> Jason >>>>>> --------------------------------------------------------- >>>>>> This message is sent to you because you are subscribed to >>>>>> the mailing list . >>>>>> To unsubscribe, E-mail to: >>>>>> archives: http://mail.webdna.us/list/talk@webdna.us >>>>>> old archives: http://dev.webdna.us/TalkListArchive/ >>>>> >>>>> --------------------------------------------------------- >>>>> This message is sent to you because you are subscribed to >>>>> the mailing list . >>>>> To unsubscribe, E-mail to: >>>>> archives: http://mail.webdna.us/list/talk@webdna.us >>>>> old archives: http://dev.webdna.us/TalkListArchive/ >>>>> >>>> --------------------------------------------------------- >>>> This message is sent to you because you are subscribed to >>>> the mailing list . >>>> To unsubscribe, E-mail to: >>>> archives: http://mail.webdna.us/list/talk@webdna.us >>>> old archives: http://dev.webdna.us/TalkListArchive/ >>> >>> --------------------------------------------------------- >>> This message is sent to you because you are subscribed to >>> the mailing list . >>> To unsubscribe, E-mail to: >>> archives: http://mail.webdna.us/list/talk@webdna.us >>> old archives: http://dev.webdna.us/TalkListArchive/ >>> >> >> >>-- >> >>----------- >>Jason >>--------------------------------------------------------- >>This message is sent to you because you are subscribed to >>the mailing list . >>To unsubscribe, E-mail to: >>archives: http://mail.webdna.us/list/talk@webdna.us >>old archives: http://dev.webdna.us/TalkListArchive/ > > -- > Terry Wilson | terry@terryfic.com | http://terryfic.com > http://WhosComing.com - a simplified, affordable online reservation system > http://TightJacket.com -- stylish protection for your laptop > -------------------------------------------------------------------------- > Attitude is the only difference between ordeal and adventure. > --------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > archives: http://mail.webdna.us/list/talk@webdna.us > old archives: http://dev.webdna.us/TalkListArchive/ > -- ----------- Jason
Associated Messages, from the most recent to the oldest:
I read more about triggers, they are tcp calls rather than internal calls, the software sends each request to dns which resolves the domain then redirects the request back to the server. I agree that timed precision is not possible via such a system. I read the description for the shell tag, there are no examples on the shell tag page at http://docs.webdna.us (only a long list of files) but if it works for changing ownership and permission that's one issue resolved. On 1/4/09, Terry Wilson wrote: > Have you tried triggers? I have a web app that relies on triggers to > send emails out for a number of sites, and have never had any > problems. It is a Linux server. Just because a few people have > problems doesn't men you will too. It's easy enough to try it out in > your configuration. You will always hear about problems, but the ones > of us who use them routinely with success probably don't report that. > > Terry > >>Hi Chris, >> >>I do not mean to offend but I find no reports of "trigger bugs fixed" >>in the mail list archive. Instead I see several reports of failed >>triggers over a long time, including this post made just days ago: >> >>>> WebDNA Version 6 >>>> In the ISP Sandbox settings there are "Sandbox Options" >>>> for Emailer and triggers. >>> >>> These are buggy in 6.0a so keep them checked on that >>> version. They should be fixed in the CICADA (6.1.x build) >>> but, I have yet to test the fix thoroughly. >> >>In this post Mr. Brooke seems to feel the bug may not yet be fixed >>even in the new version, thus I hesitate to trust triggers given the >>fact that timed event actions are mission critical for us. >> >>On 1/3/09, christophe.billiottet@webdna.us >> wrote: >>> A way to do that would be to add a "timestamp" to a small "witness >>> database" with only one record, any time the main database or the file >>> is updated (you must add a small [replace] command to update the last >>> value). Then you can compare the last counter value with the last one >>> you had and send the response to your users. A WebDNA trigger should >>> be fine. >>> >>> You could also flag the event with just a "1" in your witness >>> database, then reset it to "0" each time you send the notification to >>> your users. >>> >>> You can also use the [fileinfo] and [ModTime] but it will not work >>> with the WebDNA database, since it is not written to disk. I guess >>> this would also be slower. >>> >>> There are many ways to do this. >>> >>> chris >>> >>> >>> >>> >>> On Jan 3, 2009, at 2:51, Jason Adams wrote: >>> >>>> Sorry for the delayed response, Christmas holidays and all. Happy New >>>> Year everyone! >>>> >>>> Dylan, after reading your response I think I need to explain in more >>>> detail. I need the software to check on the status of a database and a >>>> plain text file every few seconds. When the software detects that the >>>> database or the file has changed, it must send a response to all >>>> connected visitors. >>>> >>>> I'll be keeping connections open to these visitors for the sole >>>> purpose of sending them an update every few seconds. An update will be >>>> sent whether or not something has changed since the last update. This >>>> is necessary to keep visitors informed that they are still online and >>>> connected. >>>> >>>> I've read that triggers are buggy so I don't think I should rely on >>>> them until they are fixed. This checking and updating capability is >>>> absolutely critical to the application, so this may mean it should be >>>> done with cron. If this software can interface with cron and run cron >>>> events can someone post a code example to help me get started? >>>> >>>> I run Linux servers exclusively, and I could have hundreds of servers >>>> running this distributed online system at any given moment. They are >>>> generic servers, not all the same OS and not all the same hosts, so >>>> I'll need software that works on all of them. From what I've read it >>>> looks like the company is building such a new version for Linux so >>>> maybe this is good timing. >>>> >>>> ----------- >>>> Jason >>>> >>>> >>>> >>>> On 12/21/08, Dylan Wood wrote: >>>>> Jason- >>>>> >>>>> As long as the event your talking about yields some sort of evidence >>>>> that it occurred, you can use webdna to detect that. then trigger >>>>> your >>>>> own process whatever it may be. WebDNA can read files and folders, >>>>> so >>>>> if the event you are talking about impacts the file system, you >>>>> should >>>>> be able to detect it. >>>>> >>>>> On Dec 21, 2008, at 5:28 AM, Jason Adams wrote: >>>>> >>>>>> Hello I'm new here and new to WebDNA. Hoping to get some help from >>>>>> anyone who knows. Can WebDNA detect server events then send data to >>>>>> all logged in visitors incrementally? >>>>>> >>>>>> I may need to build a site that sends data from the server >>>>>> incrementally, every second or every few seconds, if it has changed >>>>>> since the last incrementing event. Wondering if WebDNA can do this? >>>>>> >>>>>> ----------- >>>>>> Jason >>>>>> --------------------------------------------------------- >>>>>> This message is sent to you because you are subscribed to >>>>>> the mailing list . >>>>>> To unsubscribe, E-mail to: >>>>>> archives: http://mail.webdna.us/list/talk@webdna.us >>>>>> old archives: http://dev.webdna.us/TalkListArchive/ >>>>> >>>>> --------------------------------------------------------- >>>>> This message is sent to you because you are subscribed to >>>>> the mailing list . >>>>> To unsubscribe, E-mail to: >>>>> archives: http://mail.webdna.us/list/talk@webdna.us >>>>> old archives: http://dev.webdna.us/TalkListArchive/ >>>>> >>>> --------------------------------------------------------- >>>> This message is sent to you because you are subscribed to >>>> the mailing list . >>>> To unsubscribe, E-mail to: >>>> archives: http://mail.webdna.us/list/talk@webdna.us >>>> old archives: http://dev.webdna.us/TalkListArchive/ >>> >>> --------------------------------------------------------- >>> This message is sent to you because you are subscribed to >>> the mailing list . >>> To unsubscribe, E-mail to: >>> archives: http://mail.webdna.us/list/talk@webdna.us >>> old archives: http://dev.webdna.us/TalkListArchive/ >>> >> >> >>-- >> >>----------- >>Jason >>--------------------------------------------------------- >>This message is sent to you because you are subscribed to >>the mailing list . >>To unsubscribe, E-mail to: >>archives: http://mail.webdna.us/list/talk@webdna.us >>old archives: http://dev.webdna.us/TalkListArchive/ > > -- > Terry Wilson | terry@terryfic.com | http://terryfic.com > http://WhosComing.com - a simplified, affordable online reservation system > http://TightJacket.com -- stylish protection for your laptop > -------------------------------------------------------------------------- > Attitude is the only difference between ordeal and adventure. > --------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > archives: http://mail.webdna.us/list/talk@webdna.us > old archives: http://dev.webdna.us/TalkListArchive/ > -- ----------- Jason
"Jason Adams"
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