Alan,<br><br> If you have different sets of rules that you want to apply in different circunstances, you can compile and cache each of this sets as a rulebase (note that the set may contain a single rule).<br> Then, for each fact that arrives, you decide which is the rulebase that applies to it, create a working memory for that rulebase, assert the fact, run the rule and throw the working memory away (as, you mentioned you don't want this working memory anymore).
<br><br> You can, of course, work with a single rulebase and keep adding and removing rules from it, but it will be more expensive to handle that for the use case you described.<br><br> If you are able to detail your use case, we may be able to help you more.
<br><br> Regards,<br> Edson<br><br><br><div><span class="gmail_quote">2007/3/28, Jones, Alan R <<a href="mailto:alan.r.jones@boeing.com">alan.r.jones@boeing.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="">
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Yes, some of these things are being considered. Thanks for
your input , it has been helpful!</font></span></div>
<div> </div><br><br>
<p><span lang="en-us"><font face="Arial" size="2">aj</font></span> </p><br><br>
<div dir="ltr" align="left" lang="en-us">
<hr>
<font face="Tahoma" size="2"><span class="q"><b>From:</b> Anstis, Michael (M.)
[mailto:<a href="mailto:manstis1@ford.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">manstis1@ford.com</a>] <br></span><b>Sent:</b> Wednesday, March 28, 2007 9:12
AM</font><div><span class="e" id="q_1119963a6d7fc056_3"><font face="Tahoma" size="2"><br><b>To:</b> Rules Users List<br><b>Subject:</b> RE: [rules-users] Rules
Engine always running<br></font></span></div><br></div><div><span class="e" id="q_1119963a6d7fc056_5">
<div></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">I assume rules are dynamically added to the Rulebase and
that there is not a static set of rules associated with each application
release? </font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><font face="Arial"><font size="2"><font color="#0000ff"><span>I believe new rules can be dynamically added to the
existing Rulebase - whether existing WM's inherit the new rules I don't know.
Agenda Groups could provide the control of which groups of rules
fire.</span></font></font></font></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Also, if you retain FactHandles to all asserted Facts
depending upon the decision made by the component the legacy Facts can be
retracted before the new rule is activated.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">I assume you'll also have some "Rule life-cycle" control in
place? Either removing rules from a Rulebase (I believe to be possible) or
destroying redundant WM's (as per your proposal).</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Sorry, this doesn't add much more value - although
input from more experienced users is welcomed.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Cheers,</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Mike</font></span></div><br>
<blockquote dir="ltr" style="margin-right: 0px;">
<div dir="ltr" align="left" lang="en-us">
<hr>
<font face="Tahoma" size="2"><b>From:</b> <a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">rules-users-bounces@lists.jboss.org</a>
[mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">rules-users-bounces@lists.jboss.org</a>] <b>On Behalf Of </b>Jones, Alan
R<br><b>Sent:</b> 28 March 2007 15:29<br><b>To:</b> Rules Users
List<br><b>Subject:</b> RE: [rules-users] Rules Engine always
running<br></font><br></div>
<div></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Mike,</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Thanks for you rresponse, however I'm not sure based
on what we are wanting to do that we should use a single working memory. The
proposed </font></span><span><font color="#0000ff" face="Arial" size="2">approach is: </font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">a rule has been added to the rule base, then a Fact
(object) comes along and we instantiate a working memory and fire all rules
relative to this working memory. The outcome from Drools is evaluated by
another sw component, and it is decided to try a different rule with a given
Fact.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">So, a new rule, rule #2, comes along with slightly
different specifics on what it is supposed to match, so it is added to the
rule base. Then, Fact #2 comes down the pipeline. A new working
memory #2 is instantiated against the existing rulebase, Fact #2 is
asserted, and fireAllRules() called against the working memory
#2.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">The desired behavior is that only rule #2 is actually
kicked into action (against Fact #2), since the first rule and fact is done
with. We don't want the previous rules/facts in the rule base operating any
longer. </font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Maybe I just don't know enough about the proper
application of rules when solving particular problems to ask the right
questions -- my task is to expose JBoss rules as a service so
I'm trying to understand a bit about it's
operation.</font></span></div>
<div><font color="#0000ff" face="Arial" size="2"></font> </div><span></span><font face="Arial"><font color="#0000ff"><font size="2">Thanks,<span></span></font></font></font><br><br>
<p><span lang="en-us"><font face="Arial" size="2">aj</font></span> </p><br>
<p><span lang="en-us"><font face="Arial" size="2">--------------------------------------------</font></span> <br><span lang="en-us"><font color="#0000ff" face="Arial" size="2">Alan R Jones</font></span>
<br><span lang="en-us"><font face="Arial" size="2">Boeing S&IS Mission
Systems</font></span> <br><span lang="en-us"><font face="Arial" size="2">Denver
Engineering Center (BDEC)</font></span> <br><span lang="en-us"><font face="Arial" size="2">303.307.3415</font></span> </p>
<div> </div><br>
<div dir="ltr" align="left" lang="en-us">
<hr>
<font face="Tahoma" size="2"><b>From:</b> Anstis, Michael (M.)
[mailto:<a href="mailto:manstis1@ford.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">manstis1@ford.com</a>] <br><b>Sent:</b> Wednesday, March 28, 2007 2:23
AM<br><b>To:</b> Rules Users List<br><b>Subject:</b> RE: [rules-users] Rules
Engine always running<br></font><br></div>
<div></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">Hi Alan,</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2">A working memory is in essence always available\running
whilst there is a reference to it; other than the "main" thread (on which your
public static void main executes) you don't need to use other threads (but
this obviously depends upon what exactly you're trying to achieve). The
Rulebase can contain all of your production rules (in fact this is probably
the recommended approach as, assuming some rules share a common
pattern, the resulting RETE network will be optimised); and you can feed
incoming objects (Facts in JBoss Rules terms) into one working memory created
from the one Rulebase. As objects are asserted patterns (LHS) defining the
rules are matched and, once fully matched, rules are activated for execution
(RHS). <span><font color="#0000ff" face="Arial" size="2">Unfortunately I don't have any experience of JBoss Rules in a
multi-threaded environment.</font></span></font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"><span></span></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial" size="2"><span></span>For
example:-</font></span></div>
<blockquote dir="ltr" style="margin-right: 0px;">
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2">public static void main(String
args[]) {</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"> Rulebase rb =
loadRuleBase();</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"> WorkingMemory wm
= rb.newWorkingMemory();</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"> while (!exit())
{</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Courier New"><font size="2">
<font color="#0000ff">Collection c =
getObjectsFromWherever();</font></font></font></span></div>
<div dir="ltr" align="left"><span><font face="Courier New"><font size="2">
<font color="#0000ff">assertObjectsIntoWorkingMemory(c,
wm);</font></font></font></span></div>
<div dir="ltr" align="left"><span><font face="Courier New"><font size="2">
<font color="#0000ff">wm.fireAllRules();</font></font></font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"></font></span> </div>
<div dir="ltr" align="left"><span>
<font color="#0000ff" face="Courier New" size="2">try {</font></span></div>
<div dir="ltr" align="left"><span>
<font color="#0000ff" face="Courier New" size="2">Thread.sleep(1000);</font></span></div>
<div dir="ltr" align="left"><span>
<font color="#0000ff" face="Courier New" size="2">}</font></span></div>
<div dir="ltr" align="left"><span>
<font color="#0000ff" face="Courier New" size="2">catch(InterruptedException ie)
{</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"> }</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2">
}</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Courier New" size="2">}</font></span></div></blockquote>
<div><font color="#0000ff"><font face="Arial" size="2">With kind regards,</font></font></div>
<div><font color="#0000ff"><font face="Arial" size="2"></font></font> </div>
<div><font size="-0"><font color="#0000ff"><font size="2"><font face="Arial">M<span>ike</span></font></font></font></font></div>
<div><br></div>
<blockquote dir="ltr" style="margin-right: 0px;">
<div dir="ltr" align="left" lang="en-us">
<hr>
<font face="Tahoma" size="2"><b>From:</b> <a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">rules-users-bounces@lists.jboss.org</a>
[mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">rules-users-bounces@lists.jboss.org</a>] <b>On Behalf Of </b>Jones, Alan
R<br><b>Sent:</b> 27 March 2007 19:05<br><b>To:</b> Rules Users
List<br><b>Subject:</b> [rules-users] Rules Engine always
running<br></font><br></div>
<div></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span>Kind of new to JBoss Rules...I'm trying to fiigure
out from what i have read so far if the following scenario is
possible:</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span>1. Start up an instance of a working memory (say,
with dummy rule?) and keep it running, feeding it data objects to operate on
from time to time.</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span>2. As needed, kick off as many instance of working
memory within the single rule base (in a separate thread) and keep them
going as in step 1</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial" size="2"><span>The idea is to keep the rules engine running
constantly, but kick off separate working-memory threads for the injection
of various incoming rule sets and the objects those rule sets work on
as needed. Can anyone provide some insight to this? Pointers to examples,
perhaps?</span></font></div>
<div> </div><br><br>
<p><span lang="en-us"><font color="#0000ff" face="Arial" size="2"><span>Alan J.</span></font></span> </p><br>
<p><font color="#0000ff" face="Arial" size="2"></font> </p></blockquote></blockquote></span></div></div>
<br>_______________________________________________<br>rules-users mailing list<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><br><a onclick="return top.js.OpenExtLink(window,event,this)" href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">
https://lists.jboss.org/mailman/listinfo/rules-users</a><br><br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> Software Engineer - JBoss Rules Core Developer<br> Office: +55 11 3124-6000<br> Mobile: +55 11 9218-4151
<br> JBoss, a division of Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a>