RavenclawDev: returning frame from a back end; with lists
Svetlana Stenchikova
svetastenchikova at gmail.com
Fri Oct 13 00:13:30 EDT 2006
Hi,
I am now trying to hard-code a string to return, just for a test:
String str = "{\nerror false\n}";
/ "{\n" +
"error false\n" +
"results :1\n" +
"{\n" +
"{\n" +
"date_time {\n" +
"time {\n" +
" start_time 1700\n" +
" end_time 1800\n" +
"}\n" +
"date {\n" +
" valid_date true\n" +
" year 2006\n" +
" month 10\n" +
" day 11\n" +
" weekday 3\n" +
"}\n" +
"}\n" +
"}\n" +
"}\n" +
"}";
GFrame newframe = new Clause("");
newframe.setProperty(":outframe", str);
and getting exception in FrameConcept.cpp on line 288
Can anyone see a problem with this hard-coded string?
thanks,
Svetlana
On 10/12/06, Svetlana Stenchikova <svetastenchikova at gmail.com> wrote:
>
> OK, it worked after several replacements were done to the string:
>
> GFrame eventAdded = new Clause("");
>
> String strRes = tempFrame.toString();
>
> String newstr1 = strRes.replaceAll("\\{c", "{\n");
> String newstr2 = newstr1.replaceAll("\\\"", "");
> String newstr = newstr2.replaceAll("\\}", "\n}");
>
> eventAdded.setProperty(":outframe", newstr);
>
> thanks,
> Svetlana
>
> On 10/11/06, Dan Bohus <dbohus at cs.cmu.edu> wrote:
> >
> > Hi Svetlana,
> >
> >
> >
> > Yes, you should indeed return a GFrame from the java backend server.
> > This GFrame should contain one string element, called :outframe which
> > contains the string representation you had below of the desired structure (
> > e.g. like for instance the RoomLine perl returns it). If you look into
> > the BackendServer for RoomLine, essentially what that does is take that
> > string representation and put it in an outframe string slot in a galaxy
> > return frame.
> >
> >
> >
> > Hope this helps, but let me know if it doesn't
> >
> > Dan
> >
> >
> >
> >
> > ------------------------------
> >
> > *From:* Svetlana Stenchikova [mailto:svetastenchikova at gmail.com]
> > *Sent:* Wednesday, October 11, 2006 3:32 PM
> > *To:* Dan Bohus
> > *Cc:* ravenclaw-developers at cs.cmu.edu
> > *Subject:* Re: RavenclawDev: returning frame from a back end
> >
> >
> >
> > Do you think it is possible to return a structure from a java back-end
> > in a format expected by RavenClaw?
> >
> > If so, could you please recomment how, and if not, could someone point
> > to the place in RavenClaw that I could modify to work around this issue?
> >
> > I am sorry to bother you with this question, but we have a demo coming
> > up and listing the events is one of the essential functionality that we
> > wanted to show.
> >
> > Thank you all for your help!
> >
> > Svetlana
> >
> > On 10/10/06, *Svetlana Stenchikova* <svetastenchikova at gmail.com> wrote:
> >
> > Thanks Dan,
> >
> > this generally makes sense, but I am not sure how to do this in the java
> > server.
> >
> > The operation function in the java galaxy service returns a GFrame.
> >
> > I can set properties of this frame in any way, but I must return a
> > GFrame, I think. I tried declaring an operation that returns String and it
> > causes runtime exception:
> > java.lang.ClassCastException: java.lang.String
> >
> >
> > This is how a RoomLine return from a perl back end looks like:
> >
> > {
> > suggested_refine none
> > error false
> > results :1
> > {
> > {
> > date_time {
> > time {
> > start_time 1700
> > end_time 1800
> > }
> > date {
> > valid_date true
> > year 2006
> > month 10
> > day 11
> > weekday 3
> > }
> > }
> > room_size 30
> > room_projector true
> > room_whiteboard true
> > room_computer true
> > room_network true
> > room_location Wean Hall
> > room_size_spec large
> > room_number 4625
> > }
> > }
> > }
> >
> >
> > And here is how my java back end frame looks like:
> >
> > Server environment sending frame:
> > {c java_be.add_event
> > error "false"
> > :hub_opaque_data {c admin_info
> > :reply_requested 1
> > :session_id "Default"
> > :tidx 70
> > :scriptless 1
> > :timestamp [array: type GAL_FLOAT_64, 1 elements]
> > :provider_id "[8]"
> > :invoked_stype "java_be" } }
> >
> > Please make a suggestion on how to return a string from a java server.
> >
> > thank you,
> > Svetlana
> >
> >
> >
> > On 10/10/06, *Dan Bohus* <dbohus at cs.cmu.edu > wrote:
> >
> > Hi Svetlana,
> >
> >
> >
> > I think this is the same problem with "Ravenclaw frames" and "galaxy
> > frames" but on the output side. Basically what you're doing in the code
> > below is constructing a galaxy frame. Instead ravenclaw expects a single
> > string in that galaxy frame which contains the information in a single
> > string in the "string Ravenclaw frame" format…
> >
> >
> >
> > If this message is too cryptic, let me know and I can send you more
> > details,
> >
> > Dan
> >
> >
> > ------------------------------
> >
> > *From:* ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu [mailto:
> > ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu] * On Behalf Of *Svetlana
> > Stenchikova
> > *Sent:* Tuesday, October 10, 2006 5:41 PM
> > *To:* ravenclaw-developers at cs.cmu.edu
> > *Subject:* RavenclawDev: returning frame from a back end
> >
> >
> >
> > Hi,
> >
> > How should a back-end function of a ravenclaw dialog manager format a
> > frame?
> >
> > For example, I am expecting to get a "error" parameter from:
> >
> > CALL("java_be.add_event <event_add error>backend_error")
> >
> > backend_error is declared as:
> > BOOL_SYSTEM_CONCEPT(backend_error)
> >
> > In the java back-end:
> >
> > public GFrame serverOpAddEvent(GFrame f) {
> > ...
> >
> > GFrame eventAdded = new Clause("event_add");
> >
> > eventAdded.setProperty("error", "false");
> >
> > return eventAdded;
> > }
> >
> >
> > But the backend_error in DM does not get initialized.
> >
> > Is there a particular way that the return GFrame from the backend server
> > has to be generated?
> >
> > Thank you,
> > Svetlana
> >
> >
> >
> >
> >
>
>
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