It sounds like that's a sequential-parallel process, not a
parallel-parallel one? I.e. you have to convert the PDF to image
before you can slice the image up, but you CAN post-process the images
in parallel.
Can you not do this (in psuedo-code)
imageArray = pdfToImage(myPdf);
threadArray = [];
for (image in imageArray) {
threadArray.add(new thread(image) {
doStuffToImage(image);
})
}
joinThreads(threadArray);
So you'll do the pdfToImage first, and then loop over each page's
image spawning a thread per page so they all process in parallel.
To answer your first question, if you use CFHTTP, you get a new
context. The no-nesting limitation is within a single CFML request,
so if you initiate another request, you get a new (empty) threading
context. Note that while this lets you spawn new threads, it means
you CAN'T interact with the original request's threads.
cheers,
barneyb
On Wed, Oct 28, 2009 at 12:32 PM, Stefan Richter
<[email protected]> wrote:
>
> Thanks Barney.
> What may be a good workaround for the child threads problem? Could I
> hit another CFM script via cfhttp from within my first thread and have
> tat CFM spawn another thread, or is that still consider a child thread
> then?
> Basically I have 2 or 3 long running processes (image conversions and
> manipulations) which should be chained somehow. For example I need to
> first kick off a PDF to image conversion via cfpdf after a user
> uploads a file. After that process is complete I need to rename and
> sometimes cut up the generated images, or apply a different
> compression setting, resize them etc.
> Each step can take a few minutes.
>
> Yes I could use some sort of polling mechanism but that's not slick
> enough ;-)
>
> Cheers
>
> Stefan
>
>
>
>
>
> On 27 Oct 2009, at 22:46, Barney Boisvert wrote:
>
>>
>> No limit to threads on Enterprise Edition, but no CF edition allows
>> child threads. Total buzzkill. Fortunately, with native threads can
>> be leveraged with Groovy or JavaLoader's CFC-based dynamic proxies.
>> Neither one is particularly elegant, but at least you can do it, since
>> CF itself doesn't provide the tooling.
>>
>> cheers,
>> barneyb
>>
>> On Tue, Oct 27, 2009 at 3:43 PM, Stefan Richter <[email protected]
>> > wrote:
>>>
>>> Quick question: does the CF Enterprise edition allow child threads?
>>> Also is there a limit of threads with that edition?
>>>
>>> Cheers
>>>
>>> Stefan
>>>
>>>
>>>
>
>
>
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