Syncrhonous and Asynchronous calls

[Morgan Duchène]

Thank you Todd.
We'll discuss with Guillaume to see when we can plan the development of 
this new tutorial.
Morgan

Todd Wright a écrit :
>
> Morgan Duchène wrote:
>> I have downloaded the latest release of Cougaar. It seems like all 
>> designs have not been coded in the Mandelbrot example.
>
> Right, only the first three examples have been implemented.
>
>> Is there a plan to add them
>
> Yes, I'd like to implement the remaining examples but it's been a low 
> priority.  I plan to implement them sometime early next year, ideally 
> in time for the 12.6 release.
>
>> or did you consider they were part of other tutorials?
>
> The distributed example (design 6) is similar to the ping demo, which 
> is included in the Cougaar release as:
>   demo-ping.zip
>
>> Because this is a very good tutorial and nice to have it explicitly 
>> explain all designs.
>
> Thanks.
>
>> On the other hand, we could probably help to add them.
>
> Thanks for the offer.  My guess is that it'd be easier for me to 
> implement the remaining examples, but I'm sure you could help with a 
> similar tutorial.
>
> For example, it'd be great to have a UI tutorial that illustrates the 
> same basic application implemented different ways.  The application 
> could be a simple blackboard object counter that displays a table of 
> classname to count, e.g.:
>   CLASSNAME, COUNT
>   Relay, 1234
>   Task, 234
>   Asset, 4321
>   ...
> and implement several different designs:
>   1) HTML page
>   2) HTML + AJAX
>   3) Applet (embedded Swing JTable, talks to Servlet)
>   4) Google Web Toolkit (embedded GWT widgets, talks to Servlet)
>   5) Swing GUI (stand-alone application, talks to Servlet via 
> URLConnection)
>   6) SOAP client (talks to Cougaar WebServicesService "webaxis" plugin)
> The existing Cougaar demos only illustrate simple HTML pages.
>
> Similarly, it'd be very interesting to see a UI example where Google 
> Maps and/or Google Earth talks to a Cougaar servlet.  The servlet 
> would generate KML data for Google's Map API to display.
>
> Todd
>>
>> Thanks,
>> Morgan
>>
>> Todd Wright a écrit :
>>>
>>> This design issue is discussed in the "Mandelbrot" demo:
>>>   http://cougaar.org/docman/view.php/17/201/cougaar_mandelbrot.ppt
>>>
>>> The code is included in the Cougaar 12.4 release, in:
>>>   demo-mandelbrot.zip
>>>
>>> Three design options are discussed:
>>>
>>>   v1) Servlet is self-contained
>>>
>>>   v2) Servlet invokes a synchronous Service, e.g. a service advertised
>>>       by another plugin.
>>>
>>>   v3) Servlet publishes a blackboard "Job" request and waits for a
>>>       synchronized "notify()" event or subscription change.
>>>
>>> Similar to design v3, your servlet could publish a blackboard 
>>> request and then poll the blackboard for the result, or have the 
>>> client poll the servlet. Polling is easy to implement but can be 
>>> inefficient.
>>>
>>> Todd
>>>
>>> Morgan Duchène wrote:
>>>> Hi,
>>>>
>>>> I have a basic architecture question about the development model 
>>>> with Cougaar.
>>>> * Developments with Cougaar and plugins are based on blackboard 
>>>> registrations to events (objects, tasks, ...). So it is an 
>>>> asynchronous model where plugins are awaken when new events they 
>>>> are interested in are published.
>>>> * Cougaar also offers to interact with "the outside world" with 
>>>> servlets to receive commands for example. When a browser sends a 
>>>> requests for a page to and http server, it's a synchronous call as 
>>>> it waits for the answer.
>>>>
>>>> So my simple question it this one: if we don't have the data 
>>>> available on the blackboard as the servlet is sending the search 
>>>> parameters (database, files, ...), what is the best way to have 
>>>> plugins give the answer to the servlet?
>>>>
>>>> Thanks,
>>>> Morgan
>>>>
>>>> _______________________________________________
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>>>> Cougaar-developers at cougaar.org
>>>> http://cougaar.org/mailman/listinfo/cougaar-developers
>>>>
>>>
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>>
>>
>>
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