Hi Vincenzo,
Without sample code, it is hard to say for sure, but I believe
you need to check the for the token in fire()
if (input.hasToken(0)) {
}
Page 194 of the Designing Actors chapter in Volume 1 of the Design Doc at
http://ptolemy.eecs.berkeley.edu/ptolemyII/designdoc.htm
says:
* A domain-polymorphic actor cannot assume that there is data at all the input
ports. Most domainpolymorphic
actors will read at most one input token from each port, and if there are
sufficient
inputs, produce exactly one token on each output port.
* Some domains invoke the fire() method multiple times, working towards a
converged solution.
Thus, each invocation of fire() can be thought of as doing a tentative
computation with tentative
inputs and producing tentative outputs. Thus, the fire() method should not
update persistent state.
Instead, that should be done in the postfire() method, as discussed in the next
section.
_Christopher
On 6/21/11 1:18 AM, Vincenzo Forchi wrote:
Hi All,
I have a problem with the PN director on kepler 2.2. I have a simple workflow: string
constant -> file reader -> custom actor.
The string constant fires only once, but my acotr is triggered twice, and the
second times it fails because there is no token on the input port. I defined
the token consumption rate for the input
port, I have overridden prefire to return true only if a token is present on
the input port, but the actor is still fired twice.
This is a snippet from my fire method:
System.out.println(myPort.hasToken(0));
String xml = ((StringToken) myPort.get(0)).stringValue();
This is the command line output, I caught the exception and printed the stack
trace
[run] true
[run] ERROR (org.kepler.gui.MenuMapper:getActionFor:269) Exception trying to create
an Action for classname: <org.kepler.gui.RunWithFeedbackChkBoxAction>:
[run] java.lang.IllegalArgumentException: RunWithFeedbackChkBoxAction constructor
could not get actions for DEBUG->ANIMATE EXECUTION or DEBUG->STOP ANIMATING
(java.lang.reflect.InvocationTargetException)
[run] ERROR (org.kepler.gui.MenuMapper:getActionFor:269) Exception trying to create
an Action for classname: <org.kepler.gui.RunWithFeedbackChkBoxAction>:
[run] java.lang.IllegalArgumentException: RunWithFeedbackChkBoxAction constructor
could not get actions for DEBUG->ANIMATE EXECUTION or DEBUG->STOP ANIMATING
(java.lang.reflect.InvocationTargetException)
[run] ptolemy.actor.process.TerminateProcessException:
[run] at ptolemy.domains.pn.kernel.PNQueueReceiver.get(PNQueueReceiver.java:198)
[run] at ptolemy.actor.IOPort.get(IOPort.java:885)
[run] at MyClass.fire(MyClass.java:119)
[run] at ptolemy.actor.process.ProcessThread.run(ProcessThread.java:229)
The very same code works flawlessly with the DDF director: any ideas?
Thanks and cheers,
Vincenzo
--
Christopher Brooks, PMP University of California
CHESS Executive Director US Mail: 337 Cory Hall
Programmer/Analyst CHESS/Ptolemy/Trust Berkeley, CA 94720-1774
ph: 510.643.9841 (Office: 545Q Cory)
home: (F-Tu) 707.665.0131 cell: 707.332.0670
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