[cfaussie] Re: Object Locking
Dale,
Assuming the object is thread safe, no.
Mark
On 6/6/07, Dale Fraser [EMAIL PROTECTED] wrote:
This might be a dumb question.
But if I create an instance of an Object at Application level, such as a
logging Object.
Then I want to invoke the log method on every action of every page, do I
need to lock the object before invoking the log method.
Ie
cfset application.Logger = createObject('component',
'com.company.data.Logger.init()' /
Then from other pages
cfset result = applicationer.Logger.log(username, datetime, event) /
Or would the cfset need to have a lock around it.
Regards
Dale Fraser
http://dalefraser.blogspot.com
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[cfaussie] Re: Object Locking
Dale,
This has been discussed many times, and the debate still rages about race
conditions.
The answer to your question will depend on whether a race condition will
occur. What I have done in the past is done a cflock around global variables
within the cfc when being set. This will do two things, one the request is
halted until it is finished by a predecessor and secondly you do not need to
worry about locking outside your package.
Think thread safe.
Andrew Scott
Senior Coldfusion Developer
Aegeon Pty. Ltd.
www.aegeon.com.au
Phone: +613 8676 4223
Mobile: 0404 998 273
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf
Of Dale Fraser
Sent: Wednesday, 6 June 2007 12:28 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Object Locking
This might be a dumb question.
But if I create an instance of an Object at Application level, such as a
logging Object.
Then I want to invoke the log method on every action of every page, do I
need to lock the object before invoking the log method.
Ie
cfset application.Logger = createObject('component',
'com.company.data.Logger.init()' /
Then from other pages
cfset result = applicationer.Logger.log(username, datetime, event) /
Or would the cfset need to have a lock around it.
Regards
Dale Fraser
http://dalefraser.blogspot.com
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[cfaussie] Re: Object Locking
Ok,
So thread safe, I'm not really sure what this means. Well I know what it
means, but what would be an example of something that's not thread safe so
that I can think if my example would be safe.
My thinking is that if the call to the object doesn't modify the object it's
self then it's safe, is that right.
Regards
Dale Fraser
http://dalefraser.blogspot.com http://dalefraser.blogspot.com
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf
Of Andrew Scott
Sent: Wednesday, 6 June 2007 12:33 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Re: Object Locking
Dale,
This has been discussed many times, and the debate still rages about race
conditions.
The answer to your question will depend on whether a race condition will
occur. What I have done in the past is done a cflock around global variables
within the cfc when being set. This will do two things, one the request is
halted until it is finished by a predecessor and secondly you do not need to
worry about locking outside your package.
Think thread safe.
Andrew Scott
Senior Coldfusion Developer
Aegeon Pty. Ltd.
www.aegeon.com.au
Phone: +613 8676 4223
Mobile: 0404 998 273
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf
Of Dale Fraser
Sent: Wednesday, 6 June 2007 12:28 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Object Locking
This might be a dumb question.
But if I create an instance of an Object at Application level, such as a
logging Object.
Then I want to invoke the log method on every action of every page, do I
need to lock the object before invoking the log method.
Ie
cfset application.Logger = createObject('component',
'com.company.data.Logger.init()' /
Then from other pages
cfset result = applicationer.Logger.log(username, datetime, event) /
Or would the cfset need to have a lock around it.
Regards
Dale Fraser
http://dalefraser.blogspot.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
cfaussie group.
To post to this group, send email to cfaussie@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
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[cfaussie] Re: Object Locking
http://www.google.com.au/search?source=ighl=enq=CFC+thread+safebtnG=Google+Searchmeta=
Mark
On 6/6/07, Dale Fraser [EMAIL PROTECTED] wrote:
Ok,
So thread safe, I'm not really sure what this means. Well I know what it
means, but what would be an example of something that's not thread safe so
that I can think if my example would be safe.
My thinking is that if the call to the object doesn't modify the object it's
self then it's safe, is that right.
Regards
Dale Fraser
http://dalefraser.blogspot.com
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf
Of Andrew Scott
Sent: Wednesday, 6 June 2007 12:33 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Re: Object Locking
Dale,
This has been discussed many times, and the debate still rages about race
conditions.
The answer to your question will depend on whether a race condition will
occur. What I have done in the past is done a cflock around global variables
within the cfc when being set. This will do two things, one the request is
halted until it is finished by a predecessor and secondly you do not need to
worry about locking outside your package.
Think thread safe.
Andrew Scott
Senior Coldfusion Developer
Aegeon Pty. Ltd.
www.aegeon.com.au
Phone: +613 8676 4223
Mobile: 0404 998 273
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf
Of Dale Fraser
Sent: Wednesday, 6 June 2007 12:28 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Object Locking
This might be a dumb question.
But if I create an instance of an Object at Application level, such as a
logging Object.
Then I want to invoke the log method on every action of every page, do I
need to lock the object before invoking the log method.
Ie
cfset application.Logger = createObject('component',
'com.company.data.Logger.init()' /
Then from other pages
cfset result = applicationer.Logger.log(username, datetime, event) /
Or would the cfset need to have a lock around it.
Regards
Dale Fraser
http://dalefraser.blogspot.com
--
E: [EMAIL PROTECTED]
W: www.compoundtheory.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
cfaussie group.
To post to this group, send email to cfaussie@googlegroups.com
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[cfaussie] Re: Object Locking
Ahh,
Thats funny, would have just been easier to give me your page ;)
So we do all that local var stuff, thus should be good.
Regards
Dale Fraser
http://dalefraser.blogspot.com
-Original Message-
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf
Of Mark Mandel
Sent: Wednesday, 6 June 2007 12:52 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Re: Object Locking
http://www.google.com.au/search?source=ighl=enq=CFC+thread+safebtnG=Googl
e+Searchmeta=
Mark
On 6/6/07, Dale Fraser [EMAIL PROTECTED] wrote:
Ok,
So thread safe, I'm not really sure what this means. Well I know what it
means, but what would be an example of something that's not thread safe so
that I can think if my example would be safe.
My thinking is that if the call to the object doesn't modify the object
it's
self then it's safe, is that right.
Regards
Dale Fraser
http://dalefraser.blogspot.com
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On
Behalf
Of Andrew Scott
Sent: Wednesday, 6 June 2007 12:33 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Re: Object Locking
Dale,
This has been discussed many times, and the debate still rages about race
conditions.
The answer to your question will depend on whether a race condition will
occur. What I have done in the past is done a cflock around global
variables
within the cfc when being set. This will do two things, one the request is
halted until it is finished by a predecessor and secondly you do not need
to
worry about locking outside your package.
Think thread safe.
Andrew Scott
Senior Coldfusion Developer
Aegeon Pty. Ltd.
www.aegeon.com.au
Phone: +613 8676 4223
Mobile: 0404 998 273
From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On
Behalf
Of Dale Fraser
Sent: Wednesday, 6 June 2007 12:28 PM
To: cfaussie@googlegroups.com
Subject: [cfaussie] Object Locking
This might be a dumb question.
But if I create an instance of an Object at Application level, such as a
logging Object.
Then I want to invoke the log method on every action of every page, do I
need to lock the object before invoking the log method.
Ie
cfset application.Logger = createObject('component',
'com.company.data.Logger.init()' /
Then from other pages
cfset result = applicationer.Logger.log(username, datetime, event) /
Or would the cfset need to have a lock around it.
Regards
Dale Fraser
http://dalefraser.blogspot.com
--
E: [EMAIL PROTECTED]
W: www.compoundtheory.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
cfaussie group.
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[cfaussie] Re: Object Locking
And Race Conditions as well Dale... That is also a must when changing any variable that can be changed within a thread and is global to that thread, while that thread is running. For example you may have a global variable, that is changed and dependant on the thread running at the time and another thread comes along and changes that variable while your thread is still running. This can cause undesired results. Example: cfcomponent cfset variables.IsOpen = true / cffunction name=testThread cfif variables.IsOpen . if one thread is reliant on this variable condition, and it is changed by another thread then the results can be very unexpected. /cfif /cffunction /cfcomponent Race conditions are almost non existant, but the above scenario can happen. Andrew Scott Senior Coldfusion Developer Aegeon Pty. Ltd. www.aegeon.com.au Phone: +613 8676 4223 Mobile: 0404 998 273 -Original Message- From: cfaussie@googlegroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Dale Fraser Sent: Wednesday, 6 June 2007 1:03 PM To: cfaussie@googlegroups.com Subject: [cfaussie] Re: Object Locking Ahh, Thats funny, would have just been easier to give me your page ;) So we do all that local var stuff, thus should be good. Regards Dale Fraser http://dalefraser.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups cfaussie group. To post to this group, send email to cfaussie@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/cfaussie?hl=en -~--~~~~--~~--~--~---
