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<p class="MsoPlainText">The "rules as a service" app I was talking about for option #2 is using spring and it is a RESTful webapp, but dedicated to handle "rules requests".<o:p></o:p></p>
<p class="MsoPlainText">There is no DRL handled by the "rules service" , the DRL / decision tables resides outside this "rules service" app.
<o:p></o:p></p>
<p class="MsoPlainText">It is a java app devoted to take "rules request" from other applications and has a proxy to GUVNOR and wraps the returned result ( I use JSON) and<o:p></o:p></p>
<p class="MsoPlainText">Returns to the caller. <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">So, it is java code can use unit tests .... but only deals with a special task of taking "rules" related request and responses by one or more applications. Architecturally, it is a "Horizontal" layer, serving "Verticals".<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I am not quite convinced on the ‘single failure’ argument …. as reason against option #2.
<o:p></o:p></p>
<p class="MsoPlainText">Yes, architecture determines …. is it to serve one application or multiple?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Genene<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>adarsh.chaini@hsbcib.com<br>
<b>Sent:</b> Friday, September 06, 2013 11:28 AM<br>
<b>To:</b> Rules Users List<br>
<b>Cc:</b> Rules Users List; rules-users-bounces@lists.jboss.org<br>
<b>Subject:</b> Re: [rules-users] Integrate Drools with Java application, need recommendations<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I think it all depends on the architecture and the type of application and the usage of rules with in those applications.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Having a separate server adds another single point of failure and latency.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">The applications that are very distributed in nature and spread across 100's of JVM's would like the business logic more close to the data present in those nodes/JVM's.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thanks<br>
&<br>
Regards,<br>
Adarsh <br>
<br>
SENIOR LEAD DEVELOPMENT SPECIALIST<br>
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<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">Genene Geda <<a href="mailto:ggeda@ghx.com">ggeda@ghx.com</a>></span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">Rules Users List <<a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a>></span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">06/09/2013 16:22</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">Subject:</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">Re: [rules-users] Integrate Drools with Java application, need recommendations</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif""><a href="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a></span><o:p></o:p></p>
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<tt><span style="font-size:10.0pt">My preference is option #2 - REST based</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
<tt>Why? That way you will have "rules as a service" and you can serve more than one application.</tt><br>
<tt>Your interface to the GUVNOR repository would be from this "rules service" server instead of each application duplicating the same code.</tt><br>
<br>
<tt>I am building "rules service" as a horizontal for all applications to use it when they need it. In multi-applications environment, standing "rules as a service" is in my opinion - the best solution.
</tt><br>
<br>
<tt>>From the limited test I did, the cost of invoking these RESTful "rules services" is minimal than the cost to call GUVNOR to load the knowledge base.</tt><br>
<tt>So if you are using GUVNOR as a rules repository ( which is a key requirement to achieve separation of "business rules/ logic" from application code base - and to gradually engage the business analysts to fully or partially own rules authoring) .... from
my limited experience so far, option #2 is the best approach.</tt><br>
<br>
<tt>Let's know what you decide eventually and the challenges / opportunities ....</tt><br>
<br>
<tt>Genene </tt><br>
<br>
<tt>-----Original Message-----</tt><br>
<tt>From: <a href="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a> [</tt></span><a href="mailto:rules-users-bounces@lists.jboss.org"><tt><span style="font-size:10.0pt">mailto:rules-users-bounces@lists.jboss.org</span></tt></a><tt><span style="font-size:10.0pt">]
On Behalf Of Stephen Masters</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
<tt>Sent: Thursday, September 05, 2013 6:00 PM</tt><br>
<tt>To: Rules Users List</tt><br>
<tt>Subject: Re: [rules-users] Integrate Drools with Java application, need recommendations</tt><br>
<br>
<tt>My preference is option 1 ... using a Spring application with a class which wraps a knowledge base / session. This has the advantage that sometimes I really do want to be able to mix up rules results with logic that I want to implement in Java code.</tt><br>
<br>
<tt>There's obviously a performance impact if you additionally marshall to a separate Drools server, but not a huge amount. The decision should be more about whether you expect all business logic to be implemented in the Drools rules or a combination of rules
and business logic code. </tt><br>
<br>
<tt>Steve</tt><br>
<br>
<br>
<tt>On 6 Sep 2013, at 00:15, srikanthmalli <<a href="mailto:srikanthmalli@gmail.com">srikanthmalli@gmail.com</a>> wrote:</tt><br>
<br>
<tt>> Hi,</tt><br>
<tt>> </tt><br>
<tt>> I am trying Drools/Guvnor for very first time, we are planned to do </tt><br>
<tt>> Rule Authoring in Guvnor, compile, build and download the package to </tt><br>
<tt>> "Rule Package Directory".</tt><br>
<tt>> </tt><br>
<tt>> Now the question I am having is, what is the best way to integrate </tt><br>
<tt>> Drools with our Java application?</tt><br>
<tt>> Option 1) Build the knowledge agent and start inserting the facts into </tt>
<br>
<tt>> memory for rule evaluation in our application. In this case Drools </tt><br>
<tt>> engine use JVM same as application JVM.</tt><br>
<tt>> Option 2) Have a Drools Server which builds the knowledge agent, and </tt><br>
<tt>> application can send the requests to Drools Server for rule evaluation </tt>
<br>
<tt>> using REST API. Rules will be executed in separate JVM than application JVM.</tt><br>
<tt>> </tt><br>
<tt>> I also wondering is there any performance (in terms of execution time) </tt>
<br>
<tt>> difference between the options mentioned above?</tt><br>
<tt>> </tt><br>
<tt>> Could you please also let me know if I am thinking in the right direction?</tt><br>
<tt>> </tt><br>
<tt>> -Sri</tt><br>
<tt>> </tt><br>
<tt>> </tt><br>
<tt>> </tt><br>
<tt>> --</tt><br>
<tt>> View this message in context: </tt><br>
<tt>> </tt></span><a href="http://drools.46999.n3.nabble.com/Integrate-Drools-with-Java-applicati"><tt><span style="font-size:10.0pt">http://drools.46999.n3.nabble.com/Integrate-Drools-with-Java-applicati</span></tt></a><span style="font-size:10.0pt;font-family:"Courier New""><br>
<tt>> on-need-recommendations-tp4025834.html</tt><br>
<tt>> Sent from the Drools: User forum mailing list archive at Nabble.com.</tt><br>
<tt>> </tt><br>
<tt>> _______________________________________________</tt><br>
<tt>> rules-users mailing list</tt><br>
<tt>> <a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a></tt><br>
<tt>> </tt></span><a href="https://lists.jboss.org/mailman/listinfo/rules-users"><tt><span style="font-size:10.0pt">https://lists.jboss.org/mailman/listinfo/rules-users</span></tt></a><span style="font-size:10.0pt;font-family:"Courier New""><br>
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