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<DIV><FONT face=Arial size=2>Mark,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>One thing that I forgot to comment on was how the
flow architecture with its splits and joins can be used to emulate "work flow
patterns". I am VERY pleased to see this as it (in my opinion) gives rules flow
an enormous amount of logical processing power that is just not present in an
ordinary rules processing environment.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Again, congratulations !!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Rich Halsey</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>"GENIUS IS THE ULTIMATE WEAPON"</DIV>
<DIV> </DIV>
<DIV>....God grant me...<BR>The senility to forget the people I never
liked<BR>The good fortune to run into the ones that I do<BR>And the eyesight to
tell the difference."<BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mproctor@codehaus.org href="mailto:mproctor@codehaus.org">Mark
Proctor</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=rules-dev@lists.jboss.org
href="mailto:rules-dev@lists.jboss.org">Rules Dev List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=rich_halsey@bellsouth.net
href="mailto:rich_halsey@bellsouth.net">Rich Halsey</A> ; <A
title=jco@kbsc.com href="mailto:jco@kbsc.com">James C. Owen</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 26, 2007 7:58
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [rules-dev] Re: RuleFlow
preview</DIV>
<DIV><BR></DIV>Our implementation is a light layer to provide "wait states"
for one or more rules, it uses a similar principle to agenda-groups (Clips
modules) to partition the execution. Activated rules are placed in temporary
buckets (rule-flow-groups), instead of onto the agenda, when the
rule-flow-group is activated the bucket empties onto the Agenda for normal
execution, when all the emptied rules are fired the next rule-flow-groups are
activated. <BR><BR>The system is still "parallel" in nature, in that the
agenda is still responsible for executing rules and the agenda can have more
than one rule on it at at time. In our implementation all the rules in the
rule-flow-group will be put onto the agenda for execution, at the same time
standard rules can also continue to be managed and executed by the agenda, and
agenda groups (clips modules) still continue to operate - all in
parallel.<BR><BR>A rule that is specified to execute as part of a
rule-flow-group can also be part of an agenda-group, but that use case is
discouraged because it can get quite hairy unless you really know what you are
doing :) As it means a rule-flow-group can be activated, the rules moved onto
their respective agenda-groups, where any rules not in agenda-groups that do
not have focus will not fire, the next rule-flow-group will not activate
untill all rules for the current rule-flow-group have fired, regardless of the
agenda-groups they are in.<BR><BR>The limitation at the moment is that the
temporary bucket has no ability to handle different start instances and
differentiate between the rules in it's bucket of the same rule-flow, but you
can have multiple different rule flows executing in parallel. We purposefuly
kept it simple for "version 1" to build up the functionality needed for rule
flow. The use cases for parallel execution of the same flow are not easy - as
one instance can catch up and over take another instance on the same flow.
Also if a rule in a rule-flow-group activates which of the two current
instances for the same rule flow are responsible for firing it? The same issue
arrises for when you have the same rule-flow-group in multiple rule-flows. We
are currently not sure how best to handle these types of situations; maybe you
could help us on those use cases? Or even provide a patch
:)<BR><BR>Mark<BR>Rich Halsey wrote:
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<DIV><FONT face=Arial size=2>Hi Mark,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>The part in the document where it says: <FONT
face=TimesNewRomanPSMT>
<P align=left>"At this point, ruleflow-groups should not be reused in more
than one ruleflow, and you should not</P>
<P align=left>start a new instance of a process before the previous one has
ended." </P>
<P align=left>will be the weak link in the chain, i.e. there should not be
any reason why rule-flow-groups should not be reused nor having multiple
instances since rules are implicitly parallel in operation. This was what I
found to be the problem with ILOG's JRules back in the v4.0 edition. It
turned JRules into a clunky procedural processing engine (which was not what
we needed at that time).</P>
<P align=left>However, I am very proud to see that Jboss Rules (JBRules) has
successfully evolved to this point. You (and your team) are to be commended
for your efforts.</P>
<P align=left>Tally-ho !!</P>
<P align=left>Rich Halsey</P>
<P align=left> </P>
<P align=left> </P>
<P align=left> </P></FONT></FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>"GENIUS IS THE ULTIMATE WEAPON"</DIV>
<DIV> </DIV>
<DIV>....God grant me...<BR>The senility to forget the people I never
liked<BR>The good fortune to run into the ones that I do<BR>And the eyesight
to tell the difference."<BR></DIV>
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<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal">-----
Original Message ----- </DIV>
<DIV
style="BACKGROUND: rgb(228,228,228) 0% 50%; FONT: 10pt arial; font-size-adjust: none; font-stretch: normal; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial"><B>From:</B>
<A title=mproctor@redhat.com href="mailto:mproctor@redhat.com"
moz-do-not-send="true">Mark Proctor</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>To:</B>
<A title=rules-dev@lists.jboss.org href="mailto:rules-dev@lists.jboss.org"
moz-do-not-send="true">Rules Dev List</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Sent:</B>
Monday, February 26, 2007 5:12 AM</DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Subject:</B>
RuleFlow preview</DIV>
<DIV><BR></DIV>I thought everyone on the dev list would be interested in
reviewing and providing feedback on Kris' excellent work on RuleFlow -
includes screenshots :)<BR><BR>Mark<BR>-------- Original Message --------
<TABLE class=moz-email-headers-table cellSpacing=0 cellPadding=0
border=0><TBODY>
<TR>
<TH vAlign=baseline noWrap align=right>Date: </TH>
<TD>Mon, 26 Feb 2007 01:51:29 +0100</TD></TR>
<TR>
<TH vAlign=baseline noWrap align=right>From: </TH>
<TD>Kris Verlaenen <A class=moz-txt-link-rfc2396E
href="mailto:kris.verlaenen@gmail.com%3E"
moz-do-not-send="true"><kris.verlaenen@gmail.com></A></TD></TR>
<TR>
<TH vAlign=baseline noWrap align=right>Subject: </TH>
<TD>Ruleflow</TD></TR></TBODY></TABLE><BR><BR><PRE>I've attached a document describing how ruleflow is implemented /
could be used in the future. If anyone has got any suggestions or
improvements (on the API I'm proposing, or things you would like to
see differently), just let me know asap.
I think I'll be able to commit a first working version on svn soon.
Still have to include conditional connections (where a connection is
only selected if its condition evaluates to true), and some smaller
stuff.
Kris
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