Re: [Openflow-dev] Deleting instances etc.

[Daniele T. <d.t...@ic...>]

On Friday 22 February 2002 16:28, Peter Edwards wrote:
> I now have OpenFlow 0.7 (or 0.7777777 ?) downloaded from
> http://www.openflow.it/wwwopenflow/EN/index_html

I apologize for this: I think the 0.7 is a wrong name for that version...

Mmh, I think we have OpenFlow in way too many places around. Here is a re=
sume=20
of all the places you can find OpenFlow:

1) Sourgeforge: at http://sourceforge.net/projects/openflow
Here you can find the updated CVS developers use for their work. As soon =
as a=20
bug is fixed, a new functionality added and so on, this is the place that=
=20
gets modified first.

2) Zope: at http://www.zope.org/Members/vds
This place hosts some (out of date) documentation for OpenFlow as well as=
 the=20
latest (hopefully) stable version.

3) OpenFlow: at www.openflow.it
This site is trying to keep up with development. Its main objectives are =
to=20
spread knowledge about OpenFlow: general and specific documentation, late=
st=20
version download. While in the future this will be the main reference for=
=20
OpenFlow, at the moment it is on experimental development.

We are working on keeping all the sites aligned to the latest version. In=
=20
case of ambiguity the sourceforge CVS will certainly have the latest vers=
ion.

I just updated both OpenFlow and Zope site with the current version. I'll=
=20
update the latest sourceforge release as soon as possible (though the CVS=
 is=20
obviously up to date!)

> Currently I have 4 problems :
>
> 1.
> I am unable to delete instances. In the 'Process instances' tab I selec=
t
> one or more of the instances and press 'Delete instance', and all that
> happens is the selected instances remain, unselected.

Can you try this again with a more recent version (either on www.openflow=
=2Eit=20
or www.zope.org/Members/vds?

> 2.
> I tried creating an application from a DTML document, with URL
> http://localhost:8080/mywf/trialdtmldoc and empty brace parameters. The=
 URL
> is correct as I can call it directly from the browser. I then created a=
n
> activity to call this application (Manual start and finish, and empty b=
race
> parameters), and managed to get a 'Start application' action for it in =
a
> Work list. When I select the 'Start application', Zope fails, unable to
> locate the object at ...:8080/mywf/http%3A

Ok, this is easy: the url to be called should not be referred as=20
"http://localhost:8080/mywf/trialdtmldoc" but as "/mywf/trialdtmldoc"
or even just "trialdtmldoc" since the search starts from workflow level i=
tems=20
in the zope hirearchy anyway.

> 3.
> If I interrupt an OpenFlow session to browse (e.g. www.openflow.it) the=
n
> return by the browser 'Back' button, I usually find I have lost the
> required permissions to continue, and can only retrieve the situations =
by
> closing and re-loading the browser. Of course I don't know if this is a=
n
> OpenFlow problem, or Zope, or the browser (MS IE5).

Mmh, I'm not sure either. I'm sure OpenFlow product is currently not usin=
g=20
any session object (like Core Session Tracking) and that might cause some=
=20
session mess with browser's back button...

> 4.
> Please advise what is the format (or please give an example) for passin=
g
> parameters to applications.

First of all: five parameters are always passed to the application:=20
openflow_id, process_id, activity_id, instance_id and workitem_id. With t=
hese=20
parameters you can call any workflow API on the workitem you selected=20
starting the application.

For additional parameters, the format is a python-like dictionary:
comma separated key-values pairs expressed like '<key>':<value>, all wrap=
ped=20
in braces

Example 1:
You want to pass "int_one" parameter with value 1 (int) and "str_one"=20
parameter with value "one" (string):
You should write:
{'int_one': 1, 'str_one': 'one'}

You can pass items belonging to instance, activity, process and openflow,=
=20
like properties, python scripts results or other. As a rule of thumb you =
may=20
directly reference any attribute of an instance, activity, process or=20
openflow.

Example 2:
Suppose you want to pass a "myint" int property of your instance (that mi=
ght=20
have been set by some other application with a manage_addProperty call) t=
o=20
the application:
{'instance_myint': instance.myint}

You can specify parameters in two places: application definition and acti=
vity=20
definition. If parameter names collide, activity parameters override the=20
application ones (so that you can redefine an application parameter in th=
e=20
activity calling that application). You can also see application paramete=
rs=20
as a default value for the parameters, and activity parameters as actual=20
value if they need to be different from default.

Clear enough?

Thanks for your contribution,
=09Daniele =3D)