Does each quote validation exercise enrich the StatefulKnowledgeSession with other facts that could influence validation of other quotes?<br><br>If not probably using a StatefulKnowledgeSession per HTTP request might be more simple (with the KnowledgeBase as an application scoped variable).<br>
<br>Regarding retrieval of results, there are a couple of options that spring to mind:-<br><ul><li>Look at using a Global to collate results.</li><li>Look at using a Query (<a href="http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t">http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t</a>)</li>
</ul>With kind regards,<br><br>Mike<br><br><div class="gmail_quote">On 2 May 2012 10:39, stelomax <span dir="ltr"><<a href="mailto:stephen.lomax@mattelli.com" target="_blank">stephen.lomax@mattelli.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
Please bear with me, I am relatively new to the world of Drools and have a<br>
question. I am hoping it will be a simple issue.<br>
<br>
First let me frame my planned implementation at a high level. I am hoping<br>
to use Drools as a real time service enabled quote validation tool.<br>
<br>
Facts representing products and attributes will be loaded into a stateful<br>
knowledge session upon boot (using a piece of Java that loads these as facts<br>
from our product DB).<br>
<br>
The front-end application will allow users to build up quotes consisting of<br>
quote lines that make references to these products. Once the quote is built<br>
they will press a "Validate" button. This will call a webservice that will:<br>
<br>
1) Insert the quote details as facts into the knowledge session<br>
2) Run a "rule flow" to validate the quote against the product facts<br>
3) The rules will insert validation results as facts tagged against the<br>
quote<br>
4) QUERY for the validation results<br>
5) Retract the facts for the quote (inc validation results)<br>
6) Send the validation results back as a response to the webservice call<br>
<br>
My first question is how to implement step 4 --> how to physically query for<br>
the validation results pertaining to that specific quote. Any help here<br>
would be greatly appreciated.<br>
<br>
My second question relates to concurrency. As this is a quote validation<br>
tool there will be multiple users validating quotes so we will get<br>
concurrent validation requests.<br>
<br>
What is the recommended manner of dealing with concurrent rule requests<br>
within a stateful knowledge session. If 2 people attempt to validate a<br>
different quote at the same time we will have two quotes within the<br>
knowledge session together with all of the product facts. Is drools capable<br>
of running two concurrent rule flows against the knowledge session, each<br>
referencing a different quote or would we need to instantiate 2 knowledge<br>
sessions, or even deal with the matter in a serial manner placing the 2nd<br>
quote validation flow on hold until the first completes?<br>
<br>
Any help/pointers would be great. I am hoping someone out there has<br>
attempted to use Drools in a similar manner :)<br>
<br>
Many Thanks<br>
<br>
Ste<br>
<br>
--<br>
View this message in context: <a href="http://drools.46999.n3.nabble.com/Query-for-a-fact-and-concurrent-rule-execution-tp3954737.html" target="_blank">http://drools.46999.n3.nabble.com/Query-for-a-fact-and-concurrent-rule-execution-tp3954737.html</a><br>
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</blockquote></div><br>