[CFCDev] Programmatically determining a method call

[Matt Liotta]

A while back I seem to remember someone asking how to programmatically 
determine what method of a CFC was called and by whom. At the time it 
didn't seem like there was a way to do it, but I have come up with a 
way through a new feature found in JDK 1.4. Below is an example CFC 
that has a single method, which determines who called it and what 
method it is.

<cfcomponent>
        <cffunction name="getCaller" returntype="struct" access="public">
                <cfscript>
                        e = CreateObject("java", "java.lang.Exception");
                        sts = e.getStackTrace();
                        foundme = false;
                        theCaller = StructNew();
                        for(itr = 1; itr lte ArrayLen(sts); itr = itr + 1) {
                                className = sts[itr].getClassName();
                                if(foundme and className contains "2ecf") {
                                        index = Find("2ecf", className);
                                        theCaller.from = Mid(className, 3, index - 3);
                                        break;
                                }
                                if(not foundme and className contains "2ecfc") {
                                        foundme = true;
                                        methodName = sts[itr].getClassName();
                                        index = Find("$func", methodName);
                                        theCaller.toMethod = Mid(methodName, index + 
5, Len(methodName));
                                }
                        }
                </cfscript>
                <cfreturn theCaller>
        </cffunction>
</cfcomponent>
Again, the above only works in JDK 1.4. There is a way to make it work 
with earlier JDKs, but that would be more time consuming both from a 
development point of view and a performance one.

I also blogged this at http://devilm.com/archives/000044.html.

Matt Liotta
President & CEO
Montara Software, Inc.
http://www.MontaraSoftware.com
(888) 408-0900 x901
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