Mark has provided the elegant way to do it. However, as a newbie, it can be done simpler without using this API for stateless rules,.
In this JIRA, https://jira.jboss.org/jira/browse/GUVNOR-354, you will find complete working examples.

This has a ruby file, which invokes the webservice --> easily doable in struts
It uses json format - you could pass in the xml format as well.

You don't have to use Guvnor, its just that Guvnor has tooling that creates the packaging (.pkg files) , snapshots, etc and it is easier.
You can skip Guvnor ( I just have'nt tried it).


Regards,
Prem


On Thu, Jun 18, 2009 at 9:05 AM, tanzu <tanu421@rediffmail.com> wrote:

My requirement is to expose drools rules as a web service ,which can be
accessed by any kind of client including .net .I have built a struts based
web application.When the user submits the struts client should be able to
submit the data ,to the web service ,which will execute the rule engine ,and
fire all rules ,and send a response back to the client.You said it correctly
the drools execution server can suffice my need.


My doubts are
1.Is it possible that I dont use guvnor ,and instead use just the drools
expert with drl files with the execution server.
2.The data from the struts client should be converted into xml ,fact object
and sent to the server to be used in the rules.Am I thinking right.

A sample code showing how the client ,sends xml data to server ,and the
response sent back to the client ,will be very helpful to me.

Please help.I have a deadline.:-(

tanzu



pkpkpkpk wrote:
>
> Using the Drools execution server, the rules engine can be exposed as a
> web
> service.
>
> In
> http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/docs/drools-guvnor/html_single/index.html,
> check out section 1.4.7.2
>
> The web service can be invoked using JSON or XML, so, it is possible to
> invoke it from any client.
>
> Regards,
> Prem
>
>
> On Sun, Jun 14, 2009 at 6:45 AM, tanzu <tanu421@rediffmail.com> wrote:
>
>>
>> Can the drools rule engine ,be exposed as a web service or do we need to
>> write a web service and make an explicit call to rule engine ,using the
>> working memory.
>> Is it possible for a .net application to invoke drools rule engine.
>>
>>
>> Please help as I am a newbie
>>
>>
>> Thanks
>> tanzu
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