[hotproject-devel] scheduler UI, SPI, sample ready

[Jamey S. <ja...@sh...>]

OK, scheduler stuff is running now. If you want to write a scheduler
with direct access to the DOM, take a look at:

org.hotproject.scheduler.DummyScheduler

Schedulers which use this low-level interface must have their class name
listed in a file, somewhere on the class path, named

META-INF/services/org.hotproject.scheduler.SchedulerProvider

and must implement the SchedulerProvider interface. (But you probably
want to use SingletonSchedulerProvider in this case, like DummyScheduler
does.) This is because I'm using the "Service Provider" part of Sun's
JAR specification:

http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html#Service Provider

The good news is that this allows jar files containing new schedulers to
be plopped onto the classpath, and those schedulers will automagically
appear on the "Schedule" menu in hotProject. The bad news is now I'm
relying on a non-portable package, sun.misc. (It should work on any
platform with Sun's JVM, I'm guessing, but not with other vendors.) The
good news is I could reproduce their code in about half an hour. I
disassembled it, and it's not doing very much.

Oh, yeah: DummyScheduler is the "Hello, world!" of schedulers. It
doesn't actually schedule at all, it just prints a message on stdout
saying it was asked to do so.

Next step is to write the high-level interface as an implementation of
SchedulerProvider. But if somebody wanted to modify DummyScheduler to do
something amusing with the project data, I wouldn't complain.

I'd also like to apply the service provider treatment to reports. That
should be a half-hour job.
-- 
Jamey Sharp <ja...@sh...> - http://jamey.is.dreaming.org/