[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]
Subject: Re: [cam] RE: Drools and CAM
Martin, I look forward to Marks' comments. I'm wondering if he is west coast based - giving us an 8 hour time spread here... What I'm envisioning using DROOLS for is complex business logic. For example - in the grants application processing we have implemented in java - an applicant can resubmit their application. Then the validation runs something like this - if (resubmission) and (prior grant # entered) and (phase2 submission) check prior grant if (for this applicants organization) and if (not awarded) and (pending or in review) and (was submitted in previous council round) then accept action - mark prior application as superceded Needless to say this is not doable with XPath alone - requiring queries to the database - and checking of various conditions and values between the backend data and the XML data. DW ----- Original Message ----- From: <martin.me.roberts@bt.com> To: <mproctor@codehaus.org>; <david@drrw.info> Cc: <TANVEER_ASHIQUE@bah.com>; <cam@lists.oasis-open.org> Sent: Monday, January 02, 2006 7:36 AM Subject: [cam] RE: Drools and CAM Hi, In JCAM I have built in a mechanism to have DROOLS perform the DataValidation section of the CAM Spec. The idea is that by passing in a set of nodes described by an XPath it would be posible to invoke a script that would then work with the nodes supplied. This is done by describing a Java Class that allows the nodes to be added to the DROOLS working memory and allow the consequences to interact with the nodes by changing values etc. It seems to work reasonably well and is very simple to implement. I am also toying with the idea of using the DROOLS ApplicationData construct to allow the rules engine to be passed the either the template or the xmlfile. This would enable DROOLS to manipulate the complete tree and possibly transform the output based on the rules. The other extension would be to allow the DROOLS to be passed an empty document that it could use to hang new constructs off based on the rules firing. One of the questions I have is what rules might be applied. Without some clear examples it if not easy to know how to integrate the tool. It seems to me that DROOLS could be used in two parts of the CAM template - DataValidations and External Mappings. One further thing I am investigating for jCAM is the use of PicoContainer as a method to allow the other processors to be included into the processor. The idea being that for each section of the CAM template a processor would be passed three possible things - the XML file being processed, the Assembly Structure after the Business Rules hade been applied and the section of the CAM template the applied to the processor being plugin. The advantage of this method is that we can get the whole of the CAM Spec done by different people yet all work with the same tool. It also means that somebody can change the default processor with another without affecting the other bits. For example if I get the split right we should be able to allow schema based includes without disrupting the rest of the tool. Happy New Year Martin ________________________________ From: Mark Proctor [mailto:mproctor@codehaus.org] Sent: Mon 02/01/2006 05:46 To: David RR Webber (XML) Cc: TANVEER_ASHIQUE@bah.com; CAM TC; Roberts,MME,Martin,XBX R Subject: Re: Drools and CAM Sure no problem, we are always there - just letting you know, in case you need any help with Drools. Mark David RR Webber (XML) wrote: Mark, We'll see who it goes. My time is extremely short this week - will attend to the PPT first. Maybe some of the other folks on the list may want to hop over for a chat.... Thanks, DW -------- Original Message -------- Subject: Re: Drools and CAM From: Mark Proctor <mproctor@codehaus.org> <mailto:mproctor@codehaus.org> Date: Sun, January 01, 2006 10:38 pm To: "David Webber (XML)" <david@drrw.info> <mailto:david@drrw.info> Cc: TANVEER_ASHIQUE@bah.com, CAM TC <cam@lists.oasis-open.org> <mailto:cam@lists.oasis-open.org> , Martin Roberts <martin.me.roberts@bt.com> <mailto:martin.me.roberts@bt.com> IRC isn't a list it's a live chat room where you can talk to me and the other developers - no need to subscribe, just pop in and have a chat :) Mark David Webber (XML) wrote: Mark, Your PPT is a great introduction to the world of rule engines and methods. My own background is heavily Prolog - for 15 years. I missed seeing constraint based solutioning - but I guess DROOLS has to leave somethings to those old purpose built engines! And besides DROOLS could always collaborate with a Prolog engine as a close cousin.... ; -) On to CAM and DROOLS. I have some PPT slides I will share during the week once I've cleaned them up for external perusal. Basically the notion is to use the mechanisms in CAM - that is essentially a domain expert agent in XML structures and metadata - and provide an interface directly in CAM to DROOLS and back again. Then we're adding the ability to persist to SQL databases in CAM directly from the XML source - using simple XML syntax based assignment instructions. This should allow people who are not DROOLS experts - to create a business-centric solution that quickly handles basic ebusiness transactions - while allowing extended rules to be layered into this - by software staff - that handle decreet rules and tests that are beyond the scope of the base CAM function set. This gives people the best of both worlds - a purpose built business XML expert agent - coupled to the extensible DROOLS engine. Your snippet of DROOLS V3 shows that this is all heading in the right direction. We've been experimenting with: <as:includeScript location="{url/my.drl}"/> and <as:executeScript name="{name.drl}" parm="\\xpath\locator\*"/> as a first pass to provide linkage between the two. I am definately interested in discussing this with the DROOLS community - where CAM can provide a pluggable XML handler toolkit for DROOLS users? Beyond all this - DROOLS also looks like a good means to implement a state machine for BPSS (and JBOSS driven BPM) as envisioned in our BCM architecture work - but we'll solve one problem at a time here! I'm a bit allergic to signing up for IRC lists - my daily bandwidth is severally constrained already - but we can definately look at sharing some collaboration resources - possibly a wiki area - where ideas and test components can be posted..? Thanks, DW ----- Original Message ----- From: "Mark Proctor" <mproctor@codehaus.org> <mailto:mproctor@codehaus.org> To: <david@drrw.info> <mailto:david@drrw.info> ; <TANVEER_ASHIQUE@bah.com> <mailto:TANVEER_ASHIQUE@bah.com> Sent: Sunday, January 01, 2006 2:24 PM Subject: Drools and CAM David, Tanveer, GoogleAlert brought your postings to my attention. We have big plans for Drools 3.0, which will be available at the end of Q1 - see the slides at http://drools.org/download/attachments/20545/Business+Rules+Engines.ppt?version=1 for more details. In the mean time if there is anything more we can do to assist or you just want a general chat, we are always on the irc server #drools at irc.codehaus.org - we provide a web gateway at http://irc.codehaus.org <http://irc.codehaus.org/> if you do not want to install an IRC client. Mark --------------------------------------------------------------------- To unsubscribe from this mail list, you must leave the OASIS TC that generates this mail. You may a link to this group and all your TCs in OASIS at: https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]