Mark,
Now I understand what you were trying to get at. You're solution would work, but you
could also place your locks in the
setup.cfm
runthis.cfm
where you call your component methods.
The locks in these files would also have the same name to avoid the potential thread
collisions.
Cheers,
Steve
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Stephen Bosworth
Application Development and Integration
Communication and Information Services
The University of Newcastle, Australia
Phone: 02 4921 6574
Fax: 02 4921 7087
Mobile: 0438 492518
Email: [EMAIL PROTECTED]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> [EMAIL PROTECTED] 1/06/2004 3:23:50 pm >>>
I've 'solved' it as such - but I'll put in the extra time. :o)
notThreadSafe.cfc
--
<cfcomponent>
<!--- pseudo constructor --->
<cfscript>
instance.myArray = arrayNew(1);
</cfscript>
<!---
Add an item to the CFC
--->
<cffunction name="add" access="public" returntype="void">
<cfargument name="obj" type="any" required="yes">
<cfscript>
ArrayAppend(instance.myArray, argument.obj);
</cfscript>
</cffunction>
<!---
Remove an item from the CFC
--->
<cffunction name="delete" access="public" returntype="void">
<cfargument name="index" type="numeric" required="Yes">
<cfscript>
ArrayDeleteAt(instance.myArray, arguments.index);
</cfscript>
</cffunction>
<!---
gets an item from the CFC
--->
<cffunction name="get" access="public" returntype="void">
<cfargument name="index" type="numeric" required="Yes">
<cfscript>
return instance.myArray[index];
</cfscript>
</cffunction>
</cfcomponent>
--
Application.cfm
--
<cfapplication name="notthreadsafe">
<cfif NOT isDefined("application.notThreadSafe")>
<cfset application.notThreadSafe = createObject("component", "notThreadSafe")>
</cfif>
--
setup.cfm
--
<cfscript>
//can assume notThreadSafe is in application scope.
application.notThreadSafe.add("fred");
application.notThreadSafe.add("dog");
application.notThreadSafe.add("yoda");
application.notThreadSafe.add("stuff");
application.notThreadSafe.add("another");
</cfscript>
--
runthis.cfm
--
<cfscript>
//can assume notThreadSafe is in application scope.
str = application.notThreadSafe.get(5);
application.notThreadSafe.delete(5);
application.notThreadSafe.add(str);
</cfscript>
--
Now obviously, I've not included any locking in any places.
(none of this code is tested, but it SHOULD work).
Run setup.cfm
The run runthis.cfm AT THE SAME TIME as another computer is also running it.
There is no way that you can guarentee data safety on the CFC - in fact I'm sure it
will error, but only when two
threads collide.
Obviously there should be some locking at SOME level, to prevent this from happening.
However, should the
locking be at the level internal to the CFC (which I would advocate, except as a
NAME'd lock, rather than a
SCOPE lock), or should it be at 'runthis.cfm' as a scoped locking?
This is the option I would advocate:
threadSafe.cfc
--
<cfcomponent>
<!--- pseudo constructor --->
<cfscript>
instance.myArray = arrayNew(1);
</cfscript>
<!---
Add an item to the CFC
--->
<cffunction name="add" access="public" returntype="void">
<cfargument name="obj" type="any" required="yes">
<cflock timeout="60" throwontimeout="Yes" name="threadSafe.lock"
type="EXCLUSIVE">
<cfscript>
ArrayAppend(instance.myArray, argument.obj);
</cfscript>
</cflock>
</cffunction>
<!---
Remove an item from the CFC
--->
<cffunction name="delete" access="public" returntype="void">
<cfargument name="index" type="numeric" required="Yes">
<cflock timeout="60" throwontimeout="Yes" name="threadSafe.lock"
type="EXCLUSIVE">
<cfscript>
ArrayDeleteAt(instance.myArray, arguments.index);
</cfscript>
</cflock>
</cffunction>
<!---
gets an item from the CFC
--->
<cffunction name="get" access="public" returntype="void">
<cfargument name="index" type="numeric" required="Yes">
<cflock timeout="60" throwontimeout="Yes" name="threadSafe.lock"
type="EXCLUSIVE">
<cfset var obj = instance.myArray[index]>
</cflock>
<cfscript>
return obj;
</cfscript>
</cffunction>
</cfcomponent>
--
Hopefully this makes sense at this point.
Mark
------------------------------------------------------------------
[EMAIL PROTECTED]
ICQ: 3094740
Safe From Bees
[ www.safefrombees.com ]
Quoting Stephen Bosworth <[EMAIL PROTECTED]>:
> Mark,
>
> I was reading what you sent, in fact, I was discussing it here with a couple
> of fellow workers.
>
> We are obviously at a lost as to what you are trying to explain/discuss
> here.
>
> Can you provide a code example of people like me you cannot understand what
> you are trying to acheive can gain an idea as to what you are trying to do
> exactly.
>
> Cheers
>
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