Well, in the type of place I do method injection - say I have this method:
<cfscript>
function showValue()
{
return instance.value;
}
<cfscript>
And I also have 2 CFCs - A, and B
If I go:
A.showValue = showValue;
Then the CFC context of 'showValue' is now the 'A' CFC.. and if I run
the method, it will return the variable of 'instance.value' within
that CFC.
Now, if I also go:
B.showValue = showValue;
I can now call B.showValue() and the same thing happens, but the
context for this instance is the CFC instance 'B'.
Does that make sense?
Mark
On 10/23/07, Baz <[EMAIL PROTECTED]> wrote:
> I found that real interesting today as well. And my problem is basically
> solved. I was just asking about doing it with cfinvoke as an academic
> exercise.
>
> What do you mean by "losing the context of the calling CFC"? What kind of
> context and what problems can arise?
>
>
> Baz
>
>
> On 10/22/07, Mark Mandel <[EMAIL PROTECTED]> wrote:
> >
> > Interesting that you can set a function to a 'var' scoped variable,
> > and that it will resolve!
> >
> > That is pretty cool actually.
> >
> > However, you do run the risk of losing the context of the calling CFC
> > in relation to the method you wish to call - which may well be an
> > issue for you!
> >
> > I'll have a play with the technique, it's an interesting one.
> >
> > Mark
> >
> > On 10/23/07, Baz < [EMAIL PROTECTED]> wrote:
> > > Mark, in my case I am calling it from a parent CFC that is being
> extended by
> > > another CFC which may or may not be defining a custom function that
> needs to
> > > run. So the specific code in the parent CFC looks like this:
> > >
> > > <!--- generic set --->
> > > <cffunction name="set" access="public">
> > > <cfargument name="Name" type="string" />
> > > <cfargument name="Value" />
> > >
> > > <cfset var ReturnValue="" />
> > >
> > > <cfset var CustomFunctionName="set#arguments.Name#"
> />
> > > <cfset var CustomFunction="" />
> > >
> > > <!--- if a real function exists, use it --->
> > > <cfif existsFunction(CustomFunctionName)>
> > > <cfset
> CustomFunction=variables[CustomFunctionName]
> > > />
> > > <cfset ReturnValue=CustomFunction( arguments.Value) />
> > >
> > > <!--- if property is defined in PropertyList, set it --->
> > > <cfelseif listFindNoCase(getPropertyList(),
> > > arguments.Name)>
> > > <cfset ReturnValue=setValue( arguments.Name, arguments.Value) />
> > >
> > > </cfif>
> > >
> > > <cfreturn ReturnValue />
> > > </cffunction>
> > >
> > > I'm var'ing the appropriate variables and it looks thread-safe to me, am
> I
> > > mistaken?
> > >
> > > Baz
> > >
> > >
> > >
> > > On 10/22/07, Mark Mandel <[EMAIL PROTECTED]> wrote:
> > > >
> > > >
> > > > Baz,
> > > >
> > > > That has some pretty severe limitations however -
> > > >
> > > > - It can't be thread safe, as you are overwriting the same variable
> name
> > > > - If you wish to invoke that method from another CFC, you must
> > > > maintain the context of that method on that CFC, otherwise the context
> > > > of the method you are invoking is lost, and could quite possibly cause
> > > > an error
> > > >
> > > > Mark
> > > >
> > > > On 10/23/07, Baz <[EMAIL PROTECTED]> wrote:
> > > > > @Brian, there is a reason and method to the madness!
> > > > >
> > > > > @Matt, that solution won't work for this particular case because I
> know
> > > > > functionOne() will certainly define 1 named argument, but what that
> > > argument
> > > > > name is I won't know. So to adjust the test case:
> > > > >
> > > > > How can I rewrite this code:
> > > > >
> > > > > <cfinvoke method="functionOne" argument1="123"
> > > returnvariable="ReturnValue"
> > > > > />
> > > > >
> > > > > So that ReturnValue equals 123 regardless of whether functionOne is
> > > written
> > > > > like this:
> > > > >
> > > > > <cffunction name="functionOne">
> > > > > <cfargument
> > > name="SomeRandomNameThatICanNeverKnow"
> > > > > />
> > > > > <cfreturn
> > > arguments.SomeRandomNameThatICanNeverKnow
> > > > > />
> > > > > </cffunction>
> > > > > or like this:
> > > > >
> > > > > <cffunction name="functionOne">
> > > > > <cfargument name="XYZ" />
> > > > > <cfreturn arguments.XYZ />
> > > > > </cffunction>
> > > > > Another way of phrasing the question would be:
> > > > >
> > > > > Is there a way to pass unnamed arguments using cfinvoke?
> > > > >
> > > > > For the record, Dan Wilson ( http://nodans.com) helped me come up
> with a
> > > > > solution without using cfinvoke, but by dynamically invoking a
> function
> > > > > using script:
> > > > >
> > > > > // dynamic function name
> > > > > FunctionName='FunctionOne';
> > > > >
> > > > > // save the function object itself to a variable
> > > > > FunctionObject=variables[ FunctionName ];
> > > > >
> > > > > // invoke it
> > > > > FunctionObject('123');
> > > > >
> > > > > You will notice that if I invoke the function using the preceding
> > > syntax, I
> > > > > get the same result regardless of how functionOne() is defined (of
> the
> > > two
> > > > > options I specified earlier).
> > > > >
> > > > > Cheers,
> > > > > Baz
> > > > >
> > > > >
> > > > >
> > > > > On 10/22/07, Brian Kotek < [EMAIL PROTECTED]> wrote:
> > > > > > I'd argue that the better solution would be just to add a
> cfargument
> > > tag
> > > > > to the target method(s).
> > > > > >
> > > > > >
> > > > > > On 10/22/07, Baz < [EMAIL PROTECTED]> wrote:
> > > > > >
> > > > > > > Hi gang,
> > > > > > >
> > > > > > > I was wondering if it were possible to pass an un-named argument
> to
> > > a
> > > > > dynamic function. For example, I have this call:
> > > > > > >
> > > > > > >
> > > > > > > <cfinvoke method="get#arguments.Name#"
> returnvariable="ReturnValue"
> > > > > value="#arguments.Value#" /> - It is a CFINVOKE because to my
> knowledge,
> > > in
> > > > > CF8, you still can't invoke a dynamic function using script, i.e.
> > > > > set#DynamicFunction#(arguments) The attribute "value" in the
> cfinvoke
> > > call
> > > > > basically passes the invoked function an argument named "Value". Is
> it
> > > > > possible to pass in an un-named argument in position 1 instead?
> > > Basically
> > > > > the equivalent of set#DynamicFunction#(Value)??
> > > > > > >
> > > > > > > Cheers,
> > > > > > > Baz
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > E: [EMAIL PROTECTED]
> > > > W: www.compoundtheory.com
> > > >
> > > >
> > >
> > >
> > > >
> > >
> >
> >
> > --
> > E: [EMAIL PROTECTED]
> > W: www.compoundtheory.com
> >
> >
>
>
> >
>
--
E: [EMAIL PROTECTED]
W: www.compoundtheory.com
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