Re: [rules-users] How to write a rule that fires when it matches against specific facts in working memory.
Edson, I did manage to use the 'CollectSetAccumulateFunction' as a template for the MatchAll and have also successfully 'called' the accumulate function from a rule written in a .drl file. But I'm stuck at one point - how to send the value of $param to the accumulate method ? From what I understand, the accumulate method is invoked for each fact - so if I write MatchAll( $o ) it will invoke the accumulate method and passing $o fact to the method via the 'Object value' parameter. So far so go, however, I'm stuck on how to pass the value of '$param' to the accumulate method (or any other method like init, getResult for that matter). One option I can think of is to change the definition of the Option fact to include a 'param' field and then write a rule that sets the value of that field to $param (so every Options param field would get set to the value of $param). I can then extract that in the accumulate method it self. But is there a better way that I might be missing ? Thanks in advance, Gurvinder -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/How-to-write-a-rule-that-fires-when-it-matches-against-specific-facts-in-working-memory-tp2294599p2369936.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to write a rule that fires when it matches against specific facts in working memory.
Up to Drools 5, the accumulate function API supports only a single
argument to the function, but that argument can be an array or a list. So
what I do on my own implementations is to pass the $param as one element of
the array and $o as the other. It is not ideal, but it is how you can do
that in Drools 5. In Drools 6 I will change the API to support multiple
parameters, but I've been postponing that because when I do it, it will
break existing implementations of the interface.
Anyway, if you are using the MVEL dialect, creating a list is as simple
as wrapping it in [ ], as you could see in my previous e-mail.
$options : List() from accumulate(
$op : Option(),
matchAll( [ ${param}, $op ] ) )
Edson
2011/1/29 groovenarula gnaru...@la-z-boy.com
Edson,
I did manage to use the 'CollectSetAccumulateFunction' as a template for
the
MatchAll and have also successfully 'called' the accumulate function from a
rule written in a .drl file. But I'm stuck at one point - how to send the
value of $param to the accumulate method ? From what I understand, the
accumulate method is invoked for each fact - so if I write
MatchAll( $o ) it will invoke the accumulate method and passing $o fact
to the method via the 'Object value' parameter.
So far so go, however, I'm stuck on how to pass the value of '$param' to
the
accumulate method (or any other method like init, getResult for that
matter).
One option I can think of is to change the definition of the Option fact to
include a 'param' field and then write a rule that sets the value of that
field to $param (so every Options param field would get set to the value of
$param). I can then extract that in the accumulate method it self. But is
there a better way that I might be missing ?
Thanks in advance,
Gurvinder
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[rules-users] Sliding window of length (1) equals latest event?!
Hey again everyone, I seem to be having another problem. When I have a rule like that when A() over window:length(1) B() over window:length(1) then ... I imagine now having two windows of length 1. One always keeping the latest A event and one always keeping the latest B event. And I expect them to update themselves once a new event comes in. But if I have events coming in like this... A1, A2, B1 The rule fires for (A2, B1) then another event B2 is coming in and it fires for (A2,B2) So far so good. Then another event A3 is coming in and the rule fires for (A3,B2) and (A3,B1). Why? Shouldn't the B window only have B2 inside since it arrived and thus fire only for (A3,B2)? I have already been searching for this problem, found this http://drools-java-rules-engine.46999.n3.nabble.com/DROOLS-problem-with-sliding-windows-td2039892.html but I'm not sure if this is the same problem as mine. Helping me understand this is highly appreciated, since I thought I had completely understood the window behaviour. Thanks in advance. Kind regards Oliver -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Sliding-window-of-length-1-equals-latest-event-tp2370162p2370162.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Writing a pattern in which each event constraint depends on the previous event
Hello everyone. Lets say we have StockTicks... Is it possible to detect a monotonically decreasing StockTick stream over a window? If I knew the number of events I want to check on, I'd do it this way $a : StockTick() over window:time(20s) $b : StockTick(this after $a, price $a.price) over window:time(20s) ... But I don't know for how long the StockTick prices continue to decrease.. I imagine doing something like that $list : List(size 0) from collect(StockTick() over window:time(20s)) forall($a : StockTick() from $list $b : StockTick(this after $a, price $a.price from $list ) That results in a nice exception. Any idea how to do this work? And more efficiently than my approach? Thanks Oliver Exception in thread Thread-1 java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be cast to org.drools.common.EventFactHandle at org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedLeft(AfterEvaluatorDefinition.java:336) at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:110) at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:115) at org.drools.common.DoubleBetaConstraints.isAllowedCachedLeft(DoubleBetaConstraints.java:166) at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274) at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:220) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:81) at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:279) at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:220) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:81) at org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:662) at org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:270) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1187) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1089) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:893) at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:238) -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Writing-a-pattern-in-which-each-event-constraint-depends-on-the-previous-event-tp2370165p2370165.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Writing a pattern in which each event constraint depends on the previous event
See the current discussion of accumulate functions. That should satisfy your need. GreG On Jan 29, 2011, at 10:18, OlliSee o.ro...@seeburger.de wrote: Hello everyone. Lets say we have StockTicks... Is it possible to detect a monotonically decreasing StockTick stream over a window? If I knew the number of events I want to check on, I'd do it this way $a : StockTick() over window:time(20s) $b : StockTick(this after $a, price $a.price) over window:time(20s) ... But I don't know for how long the StockTick prices continue to decrease.. I imagine doing something like that $list : List(size 0) from collect(StockTick() over window:time(20s)) forall($a : StockTick() from $list $b : StockTick(this after $a, price $a.price from $list ) That results in a nice exception. Any idea how to do this work? And more efficiently than my approach? Thanks Oliver Exception in thread Thread-1 java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be cast to org.drools.common.EventFactHandle at org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedLeft(AfterEvaluatorDefinition.java:336) at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:110) at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:115) at org.drools.common.DoubleBetaConstraints.isAllowedCachedLeft(DoubleBetaConstraints.java:166) at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274) at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:220) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:81) at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:279) at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:220) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:81) at org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:662) at org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:270) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1187) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1089) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:893) at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:238) -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Writing-a-pattern-in-which-each-event-constraint-depends-on-the-previous-event-tp2370165p2370165.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Writing a pattern in which each event constraint depends on the previous event
Is there a *defined *order in which objects resulting from an over clause are presented to the preceding from? Otherwise, an accumulate function requiring a specific order is based on implementation details. -W On 29 January 2011 18:24, Greg Barton greg_bar...@yahoo.com wrote: See the current discussion of accumulate functions. That should satisfy your need. GreG On Jan 29, 2011, at 10:18, OlliSee o.ro...@seeburger.de wrote: Hello everyone. Lets say we have StockTicks... Is it possible to detect a monotonically decreasing StockTick stream over a window? If I knew the number of events I want to check on, I'd do it this way $a : StockTick() over window:time(20s) $b : StockTick(this after $a, price $a.price) over window:time(20s) ... But I don't know for how long the StockTick prices continue to decrease.. I imagine doing something like that $list : List(size 0) from collect(StockTick() over window:time(20s)) forall($a : StockTick() from $list $b : StockTick(this after $a, price $a.price from $list ) That results in a nice exception. Any idea how to do this work? And more efficiently than my approach? Thanks Oliver Exception in thread Thread-1 java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be cast to org.drools.common.EventFactHandle at org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedLeft(AfterEvaluatorDefinition.java:336) at org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:110) at org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:115) at org.drools.common.DoubleBetaConstraints.isAllowedCachedLeft(DoubleBetaConstraints.java:166) at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274) at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:220) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:81) at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:279) at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:220) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:81) at org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:662) at org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:270) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1187) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1089) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:893) at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:238) -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Writing-a-pattern-in-which-each-event-constraint-depends-on-the-previous-event-tp2370165p2370165.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to write a rule that fires when it matches against specific facts in working memory.
Edson,
That worked beautifully !
Drools is looking more and more promising for what we need to do.
Thanks for all your help,
Gurvinder
-Original Message-
From: Edson Tirelli-4 [via Drools - Java Rules Engine]
[mailto:ml-node+2380361-572428564-9...@n3.nabble.com]
Sent: Sat 1/29/2011 10:59 PM
To: Gurvinder Narula1
Subject: Re: How to write a rule that fires when it matches against specific
facts in working memory.
  Up to Drools 5, the accumulate function API supports only a single
argument to the function, but that argument can be an array or a list. So what
I do on my own implementations is to pass the $param as one element of the
array and $o as the other. It is not ideal, but it is how you can do that in
Drools 5. In Drools 6 I will change the API to support multiple parameters, but
I've been postponing that because when I do it, it will break existing
implementations of the interface.
  Anyway, if you are using the MVEL dialect, creating a list is as simple as
wrapping it in [ ], as you could see in my previous e-mail.
$options : List() from accumulate(Â
    $op : Option(),
    matchAll( [ ${param}, $op ] ) )
   Edson
2011/1/29 groovenarula [hidden email]
Edson,
I did manage to use the 'CollectSetAccumulateFunction' as a template
for the
MatchAll and have also successfully 'called' the accumulate function
from a
rule written in a .drl file. But I'm stuck at one point - how to send
the
value of $param to the accumulate method ? From what I understand, the
accumulate method is invoked for each fact - so if I write
  MatchAll( $o ) it will invoke the accumulate method and passing
$o fact
to the method via the 'Object value' parameter.
So far so go, however, I'm stuck on how to pass the value of '$param'
to the
accumulate method (or any other method like init, getResult for that
matter).
One option I can think of is to change the definition of the Option
fact to
include a 'param' field and then write a rule that sets the value of
that
field to $param (so every Options param field would get set to the
value of
$param). I can then extract that in the accumulate method it self. But
is
there a better way that I might be missing ?
Thanks in advance,
Gurvinder
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Re: [rules-users] Writing a pattern in which each event constraint depends on the previous event
how about numbering your ticks ?
as a rough outline, this might look something like:
1st : Tick ($number : num)
2nd : Tick (num == $number+1, {this.value below 1st.value})
3rd : Tick (num == $number+2, {this.value above 2nd.value})
this should find all bottoms
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