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SAX and parallel processing


parellel processing
On Fri, 31 Dec 2004 11:57:44 -0500, Alan Gutierrez
<alan-xml-dev@e...> wrote:

>     It tells me that SAX, as an API, is missing support for parallel
>     processing. Parellel porcessing is possible in SAX, or rather,
>     it is possible with ContentHandler implementations that were
>     co-operative and synchorized, but then you're forgetting an
>     interface to specify ContentHandlers, and a bunch of other whatnot.

I think that there's been a terrible amount of confusion on this thread.

As soon as the filter pipeline design pattern started to become
popular for applications based on SAX1, I assumed that people would
insert tee-joints in the pipeline to allow for parallel processing
when they needed it, especially since thread management in Java is so
easy.  Note that we're talking about parallel threads performing
different operations on the *same* sequential event stream (i.e. one
thread might be populating a database, while another is producing an
HTML page).  I can also conceive of applications where different
threads deal with different parts of the document, as long as the
source event stream stays single-thread and sequential -- for example,
a filter might divert a series of events representing a document
subtree to a separate thread that builds a data structure and performs
time-consuming operations while the rest of the event stream continues
on to the original thread (which was briefly suspended waiting for
more input).

So the source of the SAX event stream has to be sequential, but
there's no reason that the rest of the filter pipeline cannot be
parallelized.


All the best,


David

-- 
http://www.megginson.com/

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