[kepler-users] Monitor Value and Display

[Kenneth Evans]

Edward,

Thanks, I think it works much better with those changes.

I wanted the Display to appear only if the contents are not blank.  What you
did is a necessary condition for that to be possible.  I can in fact do this
using an Expression involving input.length() and a BooleanSwitch.  I had
some problems, though.

1. In Kepler I could not use a StringCompare with the second string equal to
"" in place of the Expression.  It returned False even when a Monitor said
the value was "" and an Expression using input.length() said the length was
0.  (Why I ended up using input.length() in an Expression).  I don't
understand that.

2. I tried to make a ConditionalDisplay class with the switch logic and a
Display inside the class (since I had several of these and it makes the
diagram much cleaner).  It works but seems to ignore the default parameters
of 10 rows by 80 columns that I specified in the class and uses what are
probably the default parameters for the Display.

3. I could not define parameters in the class to pass things like the title
to the Display.  It ignores them in the same way.  What I would like to do
is have a parameter in the class that is named rowsDisplayed and use that as
the value of the rowsDisplayed parameter of the Display inside the class.  I
did not find syntax to do this.  At this point I would guess you probably
can't use an expression for the Display parameters like you can in a
Constant, for example.  (Or else I don't understand ;-)
 
Thanks,

        -Ken

-----Original Message-----
From: Edward A. Lee [mailto:eal at eecs.berkeley.edu] 
Sent: Saturday, November 10, 2007 2:55 AM
To: Kenneth Evans
Cc: Kepler Mailing List
Subject: Re: [kepler-users] Monitor Value and Display


Hi Ken.

I'm checking in the following improvements:

  Display: Modified to open the window only on receipt of the first token.
  MonitorValue: Modified to clear the display in initialize

Thanks for the suggestions.

Edward

At 11:09 AM 11/8/2007, Kenneth Evans wrote:
>Hi,
>
>I have minor problems with Monitor Value and Display that I havent been
>able to work around.  Perhaps someone with more experience can help.
>
>1. If you use Monitor Display, say as the result of a long calculation, it
>retains the same value when you run the workflow again.  Is there a way to
>clear it at the start of a run?
>
>2. If you use Display for, say an actor like SSH to Execute, that has
>outputs that typically have nothing in them (stderr and error in this case)
>then a Display attached to them comes up every time and can be a nuisance.
>Is there a way to make the Display (or an alternative) come up only when
the
>output is not empty.  You can't use a Monitor Value in this case as there
>may be more than one line on those occasions where the output is not empty.
>
>Thanks,
>
>        -Ken
>
>
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------------ 
Edward A. Lee
Chair of EECS and Robert S. Pepper Distinguished Professor
231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
phone: 510-642-0253, fax: 510-642-2845
eal at eecs.Berkeley.EDU,
http://www.eecs.berkeley.edu/Faculty/Homepages/lee.html