RE: 'Locking' a process
Wrap it with a named lock ? HTH -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 15:16 To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm
Re: 'Locking' a process
You could use a named cflock I believe Stephen - Original Message - From: Robertson-Ravo, Neil (REC) [EMAIL PROTECTED] To: CF-Talk [EMAIL PROTECTED] Sent: Wednesday, October 16, 2002 3:15 PM Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting.
Re: 'Locking' a process
How about doing CFLOCK and using a named lock? Greg At 03:15 PM 10/16/02 +0100, you wrote: Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting.
RE: 'Locking' a process
OK, probably didnt make myself clear enough, my mistake...(I am aware of the cflock) I obviously want this to happen at the system level, but what I want is an abstraction above that...i.e. I am editing a file names XXX.xml, I do not want anyone else to come into the system and edit this file without them being 'aware' that I have it openedyou see what I mean? N -Original Message- From: Stephen Moretti [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:30 To: CF-Talk Subject: Re: 'Locking' a process You could use a named cflock I believe Stephen - Original Message - From: Robertson-Ravo, Neil (REC) [EMAIL PROTECTED] To: CF-Talk [EMAIL PROTECTED] Sent: Wednesday, October 16, 2002 3:15 PM Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm
RE: 'Locking' a process
Use a semaphore or lock file. When someone grabs addams.xml for editing, write a really small file called addams.lck to the same directory. When done processing, delete the addams.lck file. Change the process to look for the existence of a filename.lck file and if one exists deny access to the filename.xml file. You'll need to have a method of clearing old locks, in case someone abandons the process in the middle. The timestamp on the filename.lck file should be sufficient. I'd think a lock file over eight hours old ought to be considered ignorable. -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 10:16 AM To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
RE: 'Locking' a process
sounds like he's got an xml file open for editing though. I think he's talking about locking it so that noone else can go into the file and edit it at the same time (ie implementing a client side lock not a server side lock) I guess you could flick a bit column between 1 and 0. If a user starts editing the file, hit the db and set the column to 1 (meaning the file is locked). Everytime someone else hits the page, check the db to see if the file is locked. If it is, don't allow them to open the file. Once the first user has finished and saves the changes, flick the bit column back to 0 to allow others read/write access. Also, you may want to create some sort of maximum lock time (as users may start editing a file and never finish, thus locking everyone else out forever) To do this, create a timestamp of the current time when a user starts editing the file and have a scheduled job running on your db to re-unlock the file after a set period of time etc... Obviously there's a little bit more thought required to it than that, but you get the idea. -Original Message- From: Greg Bullough [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:29 To: CF-Talk Subject: Re: 'Locking' a process How about doing CFLOCK and using a named lock? Greg At 03:15 PM 10/16/02 +0100, you wrote: Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm
RE: 'Locking' a process
excellent idea...indeed, superb. I see what I can knock up; -Original Message- From: Everett, Al [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:41 To: CF-Talk Subject: RE: 'Locking' a process Use a semaphore or lock file. When someone grabs addams.xml for editing, write a really small file called addams.lck to the same directory. When done processing, delete the addams.lck file. Change the process to look for the existence of a filename.lck file and if one exists deny access to the filename.xml file. You'll need to have a method of clearing old locks, in case someone abandons the process in the middle. The timestamp on the filename.lck file should be sufficient. I'd think a lock file over eight hours old ought to be considered ignorable. -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 10:16 AM To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Get the mailserver that powers this list at http://www.coolfusion.com
Re: 'Locking' a process
ermm... Create a .lck file like DW does and check for its existance before processing. Have a DB table with a lock flag. Just a couple that come immediately to mind. Stephen - Original Message - From: Robertson-Ravo, Neil (REC) [EMAIL PROTECTED] To: CF-Talk [EMAIL PROTECTED] Sent: Wednesday, October 16, 2002 3:34 PM Subject: RE: 'Locking' a process OK, probably didnt make myself clear enough, my mistake...(I am aware of the cflock) I obviously want this to happen at the system level, but what I want is an abstraction above that...i.e. I am editing a file names XXX.xml, I do not want anyone else to come into the system and edit this file without them being 'aware' that I have it openedyou see what I mean? N -Original Message- From: Stephen Moretti [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:30 To: CF-Talk Subject: Re: 'Locking' a process You could use a named cflock I believe Stephen - Original Message - From: Robertson-Ravo, Neil (REC) [EMAIL PROTECTED] To: CF-Talk [EMAIL PROTECTED] Sent: Wednesday, October 16, 2002 3:15 PM Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
RE: 'Locking' a process
cheers Rich, I did think of this, but the files has no reference in the DB - it doesnt need one for this... I think writing a lock file (.lck) is the way to go :-) -Original Message- From: Rich Wild [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:26 To: CF-Talk Subject: RE: 'Locking' a process sounds like he's got an xml file open for editing though. I think he's talking about locking it so that noone else can go into the file and edit it at the same time (ie implementing a client side lock not a server side lock) I guess you could flick a bit column between 1 and 0. If a user starts editing the file, hit the db and set the column to 1 (meaning the file is locked). Everytime someone else hits the page, check the db to see if the file is locked. If it is, don't allow them to open the file. Once the first user has finished and saves the changes, flick the bit column back to 0 to allow others read/write access. Also, you may want to create some sort of maximum lock time (as users may start editing a file and never finish, thus locking everyone else out forever) To do this, create a timestamp of the current time when a user starts editing the file and have a scheduled job running on your db to re-unlock the file after a set period of time etc... Obviously there's a little bit more thought required to it than that, but you get the idea. -Original Message- From: Greg Bullough [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:29 To: CF-Talk Subject: Re: 'Locking' a process How about doing CFLOCK and using a named lock? Greg At 03:15 PM 10/16/02 +0100, you wrote: Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm
RE: 'Locking' a process
hmm, I really like this. Better than my db idea in this instance nice one. -Original Message- From: Everett, Al [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:41 To: CF-Talk Subject: RE: 'Locking' a process Use a semaphore or lock file. When someone grabs addams.xml for editing, write a really small file called addams.lck to the same directory. When done processing, delete the addams.lck file. Change the process to look for the existence of a filename.lck file and if one exists deny access to the filename.xml file. You'll need to have a method of clearing old locks, in case someone abandons the process in the middle. The timestamp on the filename.lck file should be sufficient. I'd think a lock file over eight hours old ought to be considered ignorable. -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 10:16 AM To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
RE: 'Locking' a process
Woo-hoo! I win! -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 10:48 AM To: CF-Talk Subject: RE: 'Locking' a process cheers Rich, I did think of this, but the files has no reference in the DB - it doesnt need one for this... I think writing a lock file (.lck) is the way to go :-) -Original Message- From: Rich Wild [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:26 To: CF-Talk Subject: RE: 'Locking' a process sounds like he's got an xml file open for editing though. I think he's talking about locking it so that noone else can go into the file and edit it at the same time (ie implementing a client side lock not a server side lock) I guess you could flick a bit column between 1 and 0. If a user starts editing the file, hit the db and set the column to 1 (meaning the file is locked). Everytime someone else hits the page, check the db to see if the file is locked. If it is, don't allow them to open the file. Once the first user has finished and saves the changes, flick the bit column back to 0 to allow others read/write access. Also, you may want to create some sort of maximum lock time (as users may start editing a file and never finish, thus locking everyone else out forever) To do this, create a timestamp of the current time when a user starts editing the file and have a scheduled job running on your db to re-unlock the file after a set period of time etc... Obviously there's a little bit more thought required to it than that, but you get the idea. -Original Message- From: Greg Bullough [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:29 To: CF-Talk Subject: Re: 'Locking' a process How about doing CFLOCK and using a named lock? Greg At 03:15 PM 10/16/02 +0100, you wrote: Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm
RE: 'Locking' a process
I agree. The lock file idea is more applicable. -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:48 To: CF-Talk Subject: RE: 'Locking' a process cheers Rich, I did think of this, but the files has no reference in the DB - it doesnt need one for this... I think writing a lock file (.lck) is the way to go :-) -Original Message- From: Rich Wild [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:26 To: CF-Talk Subject: RE: 'Locking' a process sounds like he's got an xml file open for editing though. I think he's talking about locking it so that noone else can go into the file and edit it at the same time (ie implementing a client side lock not a server side lock) I guess you could flick a bit column between 1 and 0. If a user starts editing the file, hit the db and set the column to 1 (meaning the file is locked). Everytime someone else hits the page, check the db to see if the file is locked. If it is, don't allow them to open the file. Once the first user has finished and saves the changes, flick the bit column back to 0 to allow others read/write access. Also, you may want to create some sort of maximum lock time (as users may start editing a file and never finish, thus locking everyone else out forever) To do this, create a timestamp of the current time when a user starts editing the file and have a scheduled job running on your db to re-unlock the file after a set period of time etc... Obviously there's a little bit more thought required to it than that, but you get the idea. -Original Message- From: Greg Bullough [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:29 To: CF-Talk Subject: Re: 'Locking' a process How about doing CFLOCK and using a named lock? Greg At 03:15 PM 10/16/02 +0100, you wrote: Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm
RE: 'Locking' a process
It harkens back to my days as a BBS SysOp. At the time, multitasking was just getting into swing on PCs, but most of the third-party applications (read: games) were strictly single thread. Letting two people into an application at one time would cause all kinds of havok. It's also used all over. Access *.ldb files, for instance. -Original Message- From: Rich Wild [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 10:41 AM To: CF-Talk Subject: RE: 'Locking' a process hmm, I really like this. Better than my db idea in this instance nice one. -Original Message- From: Everett, Al [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:41 To: CF-Talk Subject: RE: 'Locking' a process Use a semaphore or lock file. When someone grabs addams.xml for editing, write a really small file called addams.lck to the same directory. When done processing, delete the addams.lck file. Change the process to look for the existence of a filename.lck file and if one exists deny access to the filename.xml file. You'll need to have a method of clearing old locks, in case someone abandons the process in the middle. The timestamp on the filename.lck file should be sufficient. I'd think a lock file over eight hours old ought to be considered ignorable. -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 10:16 AM To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting.
Re: 'Locking' a process
Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) Tapestry does this with all the content records -- they're flagged in the db as in use by user [x] with privelegdes [RWED] -- if another user has a record open with more than R privilege, other users get only R privilege, regardless of their role or permissions, until the first user closes the record. Let me know if you'd like a more thorough explanation of how it's accomplished. S. Isaac Dealey Certified Advanced ColdFusion 5 Developer www.turnkey.to 954-776-0046 ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Get the mailserver that powers this list at http://www.coolfusion.com
RE: 'Locking' a process
Problem with a named lock is it's only available for the short time that a single cfmodule is accessing that file -- I _think_ he's talking about something more like a source-control check-in/check-out idea. Wrap it with a named lock ? HTH -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 15:16 To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Signup for the Fusion Authority news alert and keep up with the latest news in ColdFusion and related topics. http://www.fusionauthority.com/signup.cfm
RE: 'Locking' a process
yep, but I am not using a DB on this one, and how does it react if someone doesnt go thru the actual process hence the timestamp check thingy? -Original Message- From: S. Isaac Dealey [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 16:31 To: CF-Talk Subject: Re: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) Tapestry does this with all the content records -- they're flagged in the db as in use by user [x] with privelegdes [RWED] -- if another user has a record open with more than R privilege, other users get only R privilege, regardless of their role or permissions, until the first user closes the record. Let me know if you'd like a more thorough explanation of how it's accomplished. S. Isaac Dealey Certified Advanced ColdFusion 5 Developer www.turnkey.to 954-776-0046 ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting.
RE: 'Locking' a process
yep, I think we have established that :-p LOL -Original Message- From: S. Isaac Dealey [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 16:33 To: CF-Talk Subject: RE: 'Locking' a process Problem with a named lock is it's only available for the short time that a single cfmodule is accessing that file -- I _think_ he's talking about something more like a source-control check-in/check-out idea. Wrap it with a named lock ? HTH -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 15:16 To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
RE: 'Locking' a process
-Original Message- From: Everett, Al [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 15:41 To: CF-Talk Subject: RE: 'Locking' a process Use a semaphore or lock file. When someone grabs addams.xml for editing, write a really small file called addams.lck to the same directory. When done processing, delete the addams.lck file. Change the process to look for the existence of a filename.lck file and if one exists deny access to the filename.xml file. The .lck file can actually be an xml file of it's own -- wddx should be sufficient -- containing the name and possibly some contact information for the individual who currently has the file locked. If you also include the time in your wddx packet this also prevents you having to perform a separate cfdirectory ( or windows filesystemobject scripting ) to get the time of the file -- unless you check for the existance of the .lck file with cfdirectory in which case, you could potentially get the time and a name/email address from just the cfdirectory call... S. Isaac Dealey Certified Advanced ColdFusion 5 Developer www.turnkey.to 954-776-0046 ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
RE: 'Locking' a process
how does it react if someone doesnt go thru the actual process hence the timestamp check thingy? The trouble with most application lock files, is that if you don't use the application, you can override the lock anyway. With access, you can just delete the .ldb file. With dreamweaver's .lck files, you can just log onto the server and edit the files directly anyway. I don't know of anyway of calling the O/S flock() Tom Chiverton You don't have to be a mad scientist to believe in ColdFusion ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm
RE: 'Locking' a process
you mean abandoning the session? ... Yea, Tapestry has a fairly hefty login-logout architecture, which theoretically prevents people from abandoning content -- it's still possible to do it, but you'd have to work pretty hard at it. If you did manage it, unlocking the record wouldn't be tremendously difficult. Under normal conditions any content you have open gets closed automagically when you log out or are automagically logged out by the application ( which happens after [x] idle time if keep alive isn't turned on for your session, or if you close the browser or type in a different url ). Most applications probably won't have this luxury, so you're probably right, the file-system solution is probably more appropriate in this instance, especially since you're wanting to lock access to a file and not to a database record as Tapestry does. S. Isaac Dealey Certified Advanced ColdFusion 5 Developer www.turnkey.to 954-776-0046 yep, but I am not using a DB on this one, and how does it react if someone doesnt go thru the actual process hence the timestamp check thingy? -Original Message- From: S. Isaac Dealey [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 16:31 To: CF-Talk Subject: Re: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) Tapestry does this with all the content records -- they're flagged in the db as in use by user [x] with privelegdes [RWED] -- if another user has a record open with more than R privilege, other users get only R privilege, regardless of their role or permissions, until the first user closes the record. Let me know if you'd like a more thorough explanation of how it's accomplished. S. Isaac Dealey Certified Advanced ColdFusion 5 Developer www.turnkey.to 954-776-0046 ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
RE: 'Locking' a process
serves me right for responding before I finish reading the previous posts. :) yep, I think we have established that :-p LOL -Original Message- From: S. Isaac Dealey [mailto:[EMAIL PROTECTED]] Sent: 16 October 2002 16:33 To: CF-Talk Subject: RE: 'Locking' a process Problem with a named lock is it's only available for the short time that a single cfmodule is accessing that file -- I _think_ he's talking about something more like a source-control check-in/check-out idea. Wrap it with a named lock ? HTH -Original Message- From: Robertson-Ravo, Neil (REC) [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 16, 2002 15:16 To: CF-Talk Subject: 'Locking' a process Anyone got any ideas on how to do a pseudo lock on a process within an application? My example is that I am reading from an .xml file whose contents can be edited and then updated. I want to be able to lock this process so no other user can overwrite the data while another user is performing the action on it (or at least flag the fact that its open by another process.) . Neil ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting.
RE: 'Locking' a process
I think there are ways to set readonly on a file using cffile or the windows scripting host, but my impression is that in most cases these sorts of operations aren't concerned with absolutely preventing people from maliciously circumventing the system ( as is the case with anti-virus and firewall software ) but rather to stop and notify most reasonable / normal users who are using the system as expected under reasonably normal circumstances. how does it react if someone doesnt go thru the actual process hence the timestamp check thingy? The trouble with most application lock files, is that if you don't use the application, you can override the lock anyway. With access, you can just delete the .ldb file. With dreamweaver's .lck files, you can just log onto the server and edit the files directly anyway. I don't know of anyway of calling the O/S flock() Tom Chiverton You don't have to be a mad scientist to believe in ColdFusion ~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/index.cfm?sidebar=listsbody=lists/cf_talk FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Structure your ColdFusion code with Fusebox. Get the official book at http://www.fusionauthority.com/bkinfo.cfm
