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Ben Nadel at the jQuery Conference 2009 (Cambridge, MA) with: Scott Gonzalez
Ben Nadel at the jQuery Conference 2009 (Cambridge, MA) with: Scott Gonzalez ( @scott_gonzalez )

ColdFusion JavaCast() Adds No Performance Hit

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I love the fact that Java lives up ColdFusion's skirt. That is exciting. What's not as exciting is the fact that, in a seemingly random fashion, ColdFusion has trouble performing automatic casts from ColdFusion data types to Java data types. I have never really used JavaCast() to do this unless an actual error was being thrown. However, as I start to write more and more UDFs that harness Java, I have to get into the practice of doing a JavaCast() in every required place. This will make the inner working of the UDF are as black-boxed as possible.

I was concerned that JavaCast() method calls would be adding a lot of overhead to the page request. Each method call has on overhead to it. But, I am excited to say that after some basic speed testing, JavaCast() shows no apparent processing overhead. My tests were basic; I created a Java string, initialized it with a ColdFusion string (with and without a Cast) and then Upper-Cased the string:

<cftimer label="No Java Cast" type="outline">

	<!--- Loop 10,000 times. --->
	<cfloop index="intI" from="1" to="10000" step="1">

			<!--- Create a string based on date/time. --->
			<cfset strText = ("Now is " & Now()) />

			<!--- Create an upper cased string using Java. --->
			<cfset strUpperCase = CreateObject(
				"java",
				"java.lang.String"
				).Init( strText ).ToUpperCase() />

	</cfloop>

</cftimer>

<cftimer label="Java Cast" type="outline">

	<!--- Create a string based on date/time. --->
	<cfloop index="intI" from="1" to="10000" step="1">

		<!--- Create a string based on date/time. --->
		<cfset strText = ("Now is " & Now()) />

		<!--- Create an upper cased string using Java. --->
		<cfset strUpperCase = CreateObject(
			"java",
			"java.lang.String"
			).Init(
				JavaCast( "string", strText )
				).ToUpperCase() />

	</cfloop>

</cftimer>

Both of these tests performed anywhere from 450 ms to 550 ms. Neither of them showed any real trending towards better or worse.

Want to use code from this post? Check out the license.

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Ben Nadel