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Ben Nadel at Scotch On The Rocks (SOTR) 2011 (Edinburgh) with: Rob Rawlins
Ben Nadel at Scotch On The Rocks (SOTR) 2011 (Edinburgh) with: Rob Rawlins ( @SirRawlins )

Ask Ben: Limiting The Amount Of Time A Block Of Code Can Run (Attempt II)

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I have this application that uses a black-boxed piece of functionality. 98% of the time, this black-boxed functionality runs very fast as expected. Sometimes though, for reasons I cannot yet debug, this function takes so long that the page times out. Is there a way to make sure that just this block of code only executes for X number of seconds?

Ok, my last attempt at answering this question was a total failure that demonstrated my lack of understanding regarding the CFLock tag. Thankfully, Christoph Schmitz has shown my the light. I have re-attempted an answer using the CFSetting / RequestTimeOut tag and attribute. I am not 100% sure it can be done this way, but testing seems to say that Yes, it can.

<!--- Try to execute the following block of code. --->
<cftry>

	<!---
		By setting a request time out for this page, we are
		forcing it to have a maximum amount of time that it
		can run. Since the black-boxed code comes after it,
		it will be dominated by this CFSetting.
	--->
	<cfsetting
		requesttimeout="5"
		/>


	<!---
		This is our black-boxed piece of code. Not
		sure how it works, but we know that 2% of the
		time it runs way longer than it should and
		crashes the page.
	--->
	<p>
		This will only be allowed to execute for
		a maximum of 5 seconds.
	</p>


	<!---
		Catch an errors that get thrown from our
		code exceeding the CFSetting timeout attribute.
	--->
	<cfcatch>

		<!---
			Our black-boxed piece of code has run too
			long. Use this opprotunity to set default
			values so that you might be able to recover
			from this timeout.
		--->

		<!---
			Since the rest of the page will take some time
			to execute, set a new time out for this request.
		--->
		<cfsetting
			requesttimeout="60"
			/>

		<!--- Perform recovery code here. --->

	</cfcatch>

</cftry>

Hopefully this is better.

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

Reader Comments

56 Comments

while this solution would work for a calling template, it won't work within a function. I think what the person is asking is if they can make a CFC method time out after a certain amount of time. Now personally I have no idea how to do this.

15,377 Comments

Yeah, this seems to be a very difficult task (or something simple that I am just not thinking of). I saw a presentation on Blue Dragon not so long ago and they had a CFThread tag... I wonder if the CFThread tag has a timeout attribute; that seems like something that would do the trick here - wrapping the "locked down" code in a CFThread tag and forcing a small timeout.

172 Comments

When I use "while" loops, I often do something like this:

-----------------------
<!--- Set the time before entering the loop --->
<cfset var timeout = now() />

<cfloop condition="TRUE">
...do something here...

<!--- End the loop if it has run for more than five seconds --->
<cfif dateDiff("s", timeout, now()) GTE 5>
<cfbreak />
</cfif>
</cfloop>
-----------------------

Of course, that won't prevent the processing during an individual iteration of the loop from running more than five seconds.

1 Comments

YES YES YES!!! thank you so much for this post!

I was having trouble with a cffeed from an external site which was timing out constantly so getting a horrible error message on my page,

but i stumbled across this solution after lots of googling and now i have it so if my first feed times out then it reads in an alternative feed so no more errors!

I know your post is quite old but its just helped me out so much!

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Ben Nadel