My colleague has an application [a rather old application written as
we learned WebObjects with much that is embarrassing in the cruel
light of our current skills] which occasionally is called on to
display a report that can take considerable computation as it grinds
through various nested WORepetitions -- in a worst case, about 45
seconds of elapsed time. The data for the report is already in memory
so no EO operations are happening during this, just lots of rattling
round and round in WOComponents.
We're looking at various options -- improve the Java code, generate
the reports off-line as static HTML, etc.
The option I'm looking at is to render this report under the operation
of a WOLongResponse. I've not used this class before, so I looked at
Apple's example and wrote a trivial example of my own to get a sense
of how it operates. What I'm stuck on though is whether it is
possible to generate a web page during a WOLongResponse with something
like:
public class Slow extends WOLongResponsePage {
public Slow(WOContext context) {
super(context);
}
@Override
public Object performAction() {
WOComponent calcPage = pageWithName(Calc.class.getName());
WOContext calcCntx = calcPage.context();
return calcPage.generateResponse().contentString(); // may
take a long time
}
@Override
public WOComponent refreshPageForStatus(Object o) {
return this;
}
@Override
public WOComponent pageForResult(Object result) {
WOComponent donePage = pageWithName(Done.class.getName());
donePage.takeValueForKey(result, "result");
return donePage;
}
@Override
public void appendToResponse(WOResponse aResponse, WOContext
aContext) {
setRefreshInterval(3);
super.appendToResponse(aResponse, aContext);
}
}
I'm clearly confused because this doesn't work -- the
generateResponse() method call fails with a null pointer exception.
The Calc component is simply:
<wo:WORepetition count = "20">x </wo:WORepetition>
I'd appreciate some help. I have this horrible suspicion that I'm
making this more complicated than is required .. Thanks, Gavin _______________________________________________
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