[xep-support] Rendering Intermediate XML to PS and PDF

[Chris Bowditch]

I've been looking at the ConcatFormatter.java class that comes with the 
Dev kit. I have some observations that I would like to share:

1) The ConcatFormatter class doesn't work when going to PS. Works fine 
with PDF. The problem is that the PS Renderer places page data into a 
cache keyed by page number, the result is a PS file with just one 
document, no matter how many XML files you sent to ConcatFormatter. This 
happens because the 2nd and subsequent documents are just over writing 
the existing pages in the cache. The solution si simple enough, in the 
startElement event just modify the page-number attribute to match the 
ordinal position in the complete input set.
2) PS is about 3 times faster than PDF when PDF compression is off. When 
compression is on, PDF is 5 times slower than PS. Any ideas why PDF is 
so much slower than PS?
3) There seems to be a memory leak when going from the intermediate XML 
to either PS or PDF. Memory increases steadily with document count. All 
the documents I have been presenting are the same. I can process 10,000 
identical documents with 64M, but 100,000 fails with OOM Exception. 
Increasing JVM memory to 256M allows processing of 100,000. But I would 
like to know cause of this leak. Do I need to call FormatterImpl.cleanup 
  every now and again, say after every 1000 documents?

Thanks,

Chris



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