On Sep 12, 2007, at 12:24, Nicolas Baumann wrote:
Hi
I'm using FOP 0.93.
I've tried to isolate the instanciation part (the newFop method)
from the
transformation part, but when I try to reuse the instance, I get
this :
"FOTreeBuilder (and the Fop class) cannot be reused. Please
instantiate a new
instance."
Because the Fop and FOTreeBuilder instances contain references to
information that is specific to one particular rendering run.
The FopFactory and FOUserAgent, on the other hand, are there to make
sure that most info that can be re-used will also be re-used (like
font information for all the renderers, for example, or the image cache)
Why does the newFOP method takes so long the first time that it has
to timeout ?
Do you have any evidence that this is specific to FOP? As far as I
know, this phenomenon is quite common: the first time a particular
method is called, there may be referenced classes that still need to
be loaded, for instance. Depends a bit on the JVM, but it's not
something I would be worried about.
Can't this instance be created once as the server loads ?
That would be a no, but if I interpret you correctly, then it only
takes a long time the /first/ time, and so, running that method only
once would save you very little in overhead. As a possible route for
improving performance, you may want to take a look at instantiating
the FopFactory only once, as the server loads (if that is not the
case, yet). That should be enough to make sure that all but the very
first call to FopFactory.newFop() run quicker.
HTH! If not, just yell for more info.
Cheers
Andreas
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