Re: [rules-users] MVEL strict mode -- when, why?
Hey Edson, If I don't explicitly set strict to false my rules fail to compile. I will create a simple example. Or maybe this two phase is post 5.0.1? -barry -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/MVEL-strict-mode-when-why-tp95666p907803.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] MVEL strict mode -- when, why?
Ping??? -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/MVEL-strict-mode-when-why-tp95666p883142.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] MVEL strict mode -- when, why?
From the MVEL docs (http://mvel.codehaus.org/MVEL+2.0+Typing): Strict Typing Strict typing in MVEL is an optional mode for the compiler, in which all types must be fully qualified, either by declaration or inference. Enabling Strict Mode When compiling an expression, the compiler can be put into strict mode through the ParserContext by setting setStrictTypeEnforcement(true). Satisfying type strictness can be accomplished both by requiring explicit declaration of types inside the expression, or by notifying the parser ahead of time of what the types of certain inputs are. For example: ExpressionCompiler compiler = new ExpressionCompiler(expr); ParserContext context = new ParserContext(); context.setStrictTypeEnforcement(true); context.addInput(message, Message.class); context.addInput(person, Person.class); compiler.compile(context); In this example we inform the compiler that this expression will be accepting two external inputs: message and person and what the types of those inputs are. This allows the compiler to determine if a particular call is safe at compile time, instead of failing at runtime. Note about Generic Types You must use Strong Typing Mode to enable awareness of generic types. Type parameters for collections and other types will not be visible in strict-typing mode alone. Strong Typing Strong typing is a newly introduced mode in MVEL 2.0. It is different from strict mode in the sense that strongly typed mode requires that all variables be type qualified. Contrast this with strict mode which only requires that properties and method calls be qualified at compile-time. See the full article: Strong Typing Mode -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/MVEL-strict-mode-when-why-tp95666p883155.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] Potential Deadlock using fireUntilHalt and signalEvent
Thanks for tracking that down. I've had to stop using fireUntilHalt due to deadlocks but did not get the chance to determine the problem. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Potential-Deadlock-using-fireUntilHalt-and-signalEvent-tp826121p826897.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] Fusion and open-ended intervals?
If I understand you correctly Edson, you have provided a better description to solution 1) in my post above. This works to a degree but leaves a bit to be desired. For example when correlating instant events as during the interval events (ie, startX, endX, eventX) those correlations cannot simply use during, because there may be no eventX yet (ie, endX has not yet occurred). This requires patterns of the form: instant: InstantEvent beginX: BeginX (or (and instant after beginX not endX(id == beginX.id) instant is during eventX(id == beginX.id) Which like I said gets messy. Again, if the @timestamp and @duration were not stored in the fact handle and could be altered via a working-memory update then instant is during eventX would work in all instances. The trade off is that it would make the drools internals much more complex as behaviors scheduled based on @timestamp and @duration would need to be modified according on a wm.update, along with all race conditions that would entail. It could also be argued that modifying an event's timestamp smells for purity reasons. But that would depend the perspective you take. Some events unfold over time (hence the modeling construct of using startX, endX, eventX). So a counter argument might be that a CEP engine should have first class support events of this nature. -- View this message in context: http://n3.nabble.com/Fusion-and-open-ended-intervals-tp719076p721426.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] Fusion and open-ended intervals?
Actually Greg I did something very similar. Since drools locks down the event
temporal values, I added to my event class some helper methods indicating
whether the interval is open or closed:
abstract class Event {
def interval: Interval // joda interval
def isOpen = interval.end.getMillis == infiniteMillis
def isClosed = !isOpen
}
And then in rules, when to consider only open intervals I do something like
when
device: Device()
executionState: ExecutionStateEvent(deviceId == device.id, name ==
STOPPED) from entry-point mtconnect
not (DowntimeInterval(deviceId == device.id, open == true, this includes
executionState) from entry-point downtime)
This is not going to work for all situations, but its a pattern in the
toolbox.
-barry
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[rules-users] Mvel and import issues
There is a mvel bug that I run into from time to time relating to imports. I present it here to hopefully save others from spending too much time discovering the work around. My drl file starts like: import systeminsights.model.device.* import systeminsights.event.mtconnect.* import systeminsights.plugin.downtime.* declare DowntimeInterval @role(event) @timestamp(interval.start.getMillis) @duration(interval.toDurationMillis) end Every once in a while mvel will fail with ClassNotFoundException for the class DowntimeInterval. If I change the imports to: import systeminsights.model.device.* import systeminsights.event.mtconnect.* import systeminsights.plugin.downtime.* import systeminsights.plugin.downtime.DonwtimeInterval Then mvel finds the class. Later on, after making various edits I will remove the redundant import and won't get the exception. I can't reproduce this in any way -- its completely intermittent for causes (begin:rant) 80% of the time I spend debugging drools issues ends up as an mvel quirk (end:rant) -- View this message in context: http://n3.nabble.com/Mvel-and-import-issues-tp719007p719007.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] Fusion and open-ended intervals?
A fusion design question: I have events that represent intervals. Initially the intervals are open-ended (kind a like the current state of an entity). Other events are matched during the interval and correlated. At some point the interval will be closed (eg, a specific downtime interval is closed because the device is no online again). All the events in this system are immutable -- so if some property of an event changes, it is cloned and modified in working-memory. For the case of the interval events, initially the interval is inserted open-ended, and at some point later closed and then modified. This does not work with fusion however, since an event's duration is maintained by the fact-handle not the event itself. Hence a modify with a now closed interval (ie, a finite @duration) has no effect. I'm guessing the temporal values are maintained the handle to ensure stable values for the behaviors that trigger based on temporal values, which is reasonable. So I'm looking for alternative designs. Some are: 1) Modeled the intervals as begin/end events, but that gets messy real fast (have to correlate the begin/end events somehow, can't use evaluators like 'includes' or 'during', etc). 2) Retract the interval event when it is closed (this way closed intervals no longer correlate with other incoming events). But then we really have a manually maintained state machine using only facts, and there can be no reasoning over a series these interval events. (eg, 3 downtimes longer than 2 minutes in the last hour). Opinions? -barry -- View this message in context: http://n3.nabble.com/Fusion-and-open-ended-intervals-tp719076p719076.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] drl's and silent failures
No jira yet, my brain was too frazzled late last night. Dialect was mvel against 5.0.1. Also ran into a few internal exceptions wrt to window:length(1) and doing an explicit retract of an event from that window. In 5.0.1 it yielded an NPE, in 5.1.M1 it yielded an internal error (can't build trunk). Should be able to reproduce easily, but I want to try to figured these out myself as part of learning the internals a bit more. -- View this message in context: http://n3.nabble.com/drl-s-and-silent-failures-tp704973p706069.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] drl's and silent failures
** warning: This is a rant, but it just might save you some head scratching if you run into these issues ** I really hate writing rules. Not, well not rules, but rules in the DRL language. There are so many edge conditions that fail silently. Here just two from today: ... then retract(f1) // some comment retract(f2) end In the above retract(f2) will not be invoke. No message about any problems -- it just doesn't happen. Remove the comment and f2 is retracted. And, where 'ksession' is a global ... then update(ksession.getFactHandle(f1), new MyF1(10, 10)) end In this one the constructor used for MyF1 does not exists. No message, just silent failure. Change the rule to: ... then MyF1 fi_new = MyF1(10, 10) update(ksession.getFactHandle(f1), f1_new) end And now the error message about the missing constructor is produced. -- View this message in context: http://n3.nabble.com/drl-s-and-silent-failures-tp704973p704973.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] No sources for the snapshot builds??
Really? -- View this message in context: http://n3.nabble.com/No-sources-for-the-snapshot-builds-tp705081p705081.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] Overriding default evaluators
That may be how its supposed to work, but it does not.
PackageBuilderConfiguration#buildEvaluatorRegistry selects properties from
'chainedProperties' from the two collections of properties -- the drools
default and the scala extensions -- into a single map. It then adds the
evaluators from that combined map, which is now intermingled so the add
order is undefined.
My workaround was, after the registry is first created but before any drls
are parsed (hack alert):
def registerScalaEvaluators(kbuilder: KnowledgeBuilder) {
val kbuilderConfig =
kbuilder.asInstanceOf[KnowledgeBuilderImpl].getPackageBuilder.getPackageBuilderConfiguration
val chainedProperties = kbuilderConfig.getChainedProperties
val evaluatorRegistry = kbuilderConfig.getEvaluatorRegistry
val scalaEntries = new java.util.HashMap[String, String]
chainedProperties.mapStartsWith(scalaEntries,
EvaluatorOption.PROPERTY_NAME+scala_, true)
for (className - scalaEntries.values) {
evaluatorRegistry.addEvaluatorDefinition(className)
}
}
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Re: [rules-users] Overriding default evaluators
I should point out that this is only a problem when overriding operators. But I won't, at least here, go into the other nasty hacks I have to do to get around the non-polymorphic ValueType systems. I'm assuming that that design is there for performance reasons (ie, to eliminate the need for instanceOf checks) but it really creates serious smells all over the code base. Ok, I guess I'm going into it ;-) Consider SetEvaluatorDefintion. It has to define duplicate evaluators for all the ValueTypes -- even though they all do the same thing. This duplication is seems to exists only to support the lookup of evaluators by ValueType. Of course I did not follow this pattern in the scala evaluators since I'm way too lazy for that ;-) Anyway, I've worked around all my issues for now. Once I get mostly done with scala extensions to the DRL syntax I'll compile my issues and maybe we can discuss modifications to drools internals. -- View this message in context: http://n3.nabble.com/Overriding-default-evaluators-tp441342p442366.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] MVEL strict mode -- when, why?
I have never gotten any of my rules to compile using mvel strict mode. If I
leave the default I get spews of error messages that I can't make any sense
of. For example with:
---
package systeminsights.plugin.core.schedule
rule foo
when
eval(true)
then
// noop
end
---
I get messages like
[Error: Failed to compile: 3 compilation error(s):
- (1,21) unqualified type in strict mode for: plugin
- (1,26) unqualified type in strict mode for: core
- (1,35) unqualified type in strict mode for: schedule]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
If I set strict mode to false all is good.
So, what is actually going on with strict mode? And how does one interpret
messages such as the above?
-barry
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[rules-users] mythical functions
Chris Richmond wrote:
So..assuming I *did* want to put a simple function in my .drl
file..*where*
do I have to put it? My oringal question about how to make a simple
function declaration is still a mystery to me.
Did this ever get answered? I have never been able to use a function. I
always get mvel compile errors.
Consider this:
package systeminsights.plugin.core.schedule
dialect mvel
function String f() {
return function;
}
rule Invoke function
when
eval(true)
then
System.out.println(*** f= f())
end
With strict mvel:
[Error: Failed to compile: 1 compilation error(s):
- (1,3) unable to resolve method using strict-mode: java.lang.Object.f()]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
at
org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:78)
With non-strict mvel:
org.drools.runtime.rule.ConsequenceException: rule: Invoke function
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:975)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:915)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1121)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:698)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:664)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:198)
at
systeminsights.infra.drools.DroolsGroovyTestFixture.fireAllRules(DroolsGroovyTestFixture.groovy:89)
at
systeminsights.infra.drools.DroolsGroovyTestFixture._clinit__closure19(DroolsGroovyTestFixture.groovy:226)
at
systeminsights.infra.drools.DroolsGroovyTestFixture.getProperty(DroolsGroovyTestFixture.groovy)
at systeminsights.plugin.core.schedule.FunctionsTest.With device(_) -
device(_) is effective(FunctionsTest.groovy:19)
Caused by: [Error: unable to access property (null parent): f]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
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Re: [rules-users] mythical functions
Yes, the above example had a typo: System.out.println(*** f= f()) Was really when I ran the test: System.out.println(*** f= + f()) -- View this message in context: http://n3.nabble.com/functions-tp60463p95673.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] mythical functions
Interesting, if I change from mvel to java and remove the package statement:
function String f() {
return function;
}
rule Invoke function
when
eval(true)
then
System.out.println(*** f= + f());
end
---
Then this works.
So then, what permutations of mvel/java actually work:
--
1. Java + Qualified package:
package systeminsights.plugin.core.schedule
function String f() {
return function;
}
rule Invoke function
when
eval(true)
then
System.out.println(*** f= + f());
end
---
Nope, this gives the obscure exception
org.drools.RuntimeDroolsException: java.lang.ClassNotFoundException:
systeminsights.plugin.core.schedule.Rule_Invoke_function_0ConsequenceInvoker
--
2. Java + simple package
package systeminsights
...
Yep, this works.
--
3. Mvel + qualified package + strict
Nope:
[Error: Failed to compile: 1 compilation error(s):
- (1,3) unable to resolve method using strict-mode: java.lang.Object.f()]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
--
4. Mvel + qualified package + non-strict
Nope:
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:975)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:915)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1121)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:698)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:664)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:198)
at
systeminsights.infra.drools.DroolsGroovyTestFixture.fireAllRules(DroolsGroovyTestFixture.groovy:89)
at
systeminsights.infra.drools.DroolsGroovyTestFixture._clinit__closure19(DroolsGroovyTestFixture.groovy:226)
at
systeminsights.infra.drools.DroolsGroovyTestFixture.getProperty(DroolsGroovyTestFixture.groovy)
at systeminsights.plugin.core.schedule.FunctionsTest.With device(_) -
device(_) is effective(FunctionsTest.groovy:19)
Caused by: [Error: unable to access property (null parent): f]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:860)
--
5. Mvel + simple package + strict
package systeminsights
dialect mvel
function String f() {
return function
}
rule Invoke function
when
eval(true)
then
System.out.println(*** f= + f())
end
---
Nope:
[Error: Failed to compile: 1 compilation error(s):
- (1,3) unable to resolve method using strict-mode: java.lang.Object.f()]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
--
6. Mvel + simple package + non-strict
Nope:
org.drools.runtime.rule.ConsequenceException: rule: Invoke function
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:975)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:915)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1121)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:698)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:664)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:198)
at
systeminsights.infra.drools.DroolsGroovyTestFixture.fireAllRules(DroolsGroovyTestFixture.groovy:89)
at
systeminsights.infra.drools.DroolsGroovyTestFixture._clinit__closure19(DroolsGroovyTestFixture.groovy:226)
at
systeminsights.infra.drools.DroolsGroovyTestFixture.getProperty(DroolsGroovyTestFixture.groovy)
at systeminsights.plugin.core.schedule.FunctionsTest.With device(_) -
device(_) is effective(FunctionsTest.groovy:19)
Caused by: [Error: unable to access property (null parent): f]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:860)
--
7. Mvel + no package + strict
Nope:
[Error: Failed to compile: 1 compilation error(s):
- (1,3) unable to resolve method using strict-mode: java.lang.Object.f()]
[Near : {... Unknown }]
Re: [rules-users] Trivial rule with condition in RHS won't compile, help please
Ok, I found http://n3.nabble.com/Strange-MVEL-error-td62055.html#a62055 which indicates that expressions are disabled in mvel RHS. I understand good intentions, but I **need** this expression for this particular situation. Anybody know some what to turn this back on? Also, when I try wrap the RHS in a function, that also fails. I'm guessing because I declare dialect mvel for the entire file. If this is why function fails to compile with an if-statement, this must be a bug. -- View this message in context: http://n3.nabble.com/Trivial-rule-with-condition-in-RHS-won-t-compile-help-please-tp67458p67472.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] Trivial rule with condition in RHS won't compile, help please
The following rule:
rule test dialect mvel
when
eval(true)
then
if (true) {
System.out.println(***)
}
end
Fails with:
java.lang.RuntimeException: Unable to build expression for 'consequence':
was expecting type: java.lang.Object; but found type: void 'if (true) {
System.out.println(***)
}
true
' : [Rule name='test']
I can't for the live of me figure out what mvel is bitching about.
Note that the following does compile:
rule test dialect mvel
when
eval(true)
then
//if (true) {
System.out.println(***)
//}
end
--
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Re: [rules-users] Trivial rule with condition in RHS won't compile, help please
Greg Barton wrote: You can use them in the RHS, but just with java dialect. This is inconsistent. If they can be used in java, then they should not be disabled for mvel. -- View this message in context: http://n3.nabble.com/Trivial-rule-with-condition-in-RHS-won-t-compile-help-please-tp67458p67488.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] MVEL wows: what does importInjectionRequired mean?
I'm at my wits end. I have two simple rules in two separate packages, they are of the form: rule1: import somepackage.* global somepackage.Foo foo ... then foo.doSomething(...) end rule2: import otherpackage.* global otherpackage.Gar gar ... then gar.doSomething(...) end When mvel is resolving foo for rule1 it does so via org.mvel2.compiler.CompiledExpression#getValue:line-104 When resolving gar for rule2 it does so via org.mvel2.compiler.CompiledExpression#getValue:line-107 The difference is that for rule1 the variable 'importInjectionRequired' is true, which results in 'foo' being resolved, but for rule2 this variable is false which results in 'gar' not being resolved. I suspecting that its important that the packages and the global instances are added dynamically *after* the session is created (in scala'ish dialect): val session = createSessionUsingNoPackages val kbuilder1 = KnowledgeBuilderFactory.newKnowledgeBuilder kbuilder1.add(rule1.drl, ResourceType.DRL) session.knowledgeBase addKnowledgePackages (kbuilder1.getKnowledgePackages) session addGlobal (foo, foo) val kbuilder2 = KnowledgeBuilderFactory.newKnowledgeBuilder kbuilder2.add(rule2.drl, ResourceType.DRL) session.knowledgeBase addKnowledgePackages (kbuilder2.getKnowledgePackages) session addGlobal (Gar, gar) If just one or the other packages are added the session, then either variable is resolved. But if both are added the session the 'gar' is not resolved. It does not matter what order they added to the session. I can also try to access 'gar' in rule1 and it also will not be resolved. I guess I really don't expect any help on this, but I will boil it down to a simple test and submit it to jira -barry -- View this message in context: http://n3.nabble.com/MVEL-wows-what-does-importInjectionRequired-mean-tp66496p66496.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] MVEL wows: what does importInjectionRequired mean?
Oh boy, what a ride. In my real code the two variables are called DeviceOperatingStateModel and DeviceUtilizationStateModel. Just as an experiment I renamed the second to aa -- low and behold the variable was resolved. Then I changed to DeviceUtilizationStateModelx and deviceUtilizationStateModel and both of those were resolved. This is so strange. There something about the name DeviceUtilizationStateModel that mvel just does not like! (Ok, surely that's not it and its something else in classpath. But its more fun to make believe that mvel doesn't like my names). -- View this message in context: http://n3.nabble.com/MVEL-wows-what-does-importInjectionRequired-mean-tp66496p66543.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] MVEL wows: what does importInjectionRequired mean?
Wolfgang Laun-2 wrote: The usual approach is to add all KPs in a single add call: Yes, but for my system rules are modular and there is no single place where they are all known. I could of course define a dual-pass configuration, but that adds a lot of boilerplate code that adds no business value. -- View this message in context: http://n3.nabble.com/MVEL-wows-what-does-importInjectionRequired-mean-tp66496p66595.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] Does Session effeciently filter unused facts, or...
Greg, I'm not following how this is related to my question. Probably I was unclear. Suppose I have 1000 event types/classes, but rules that use only 50 types in LHS patterns. I will be receiving events of random types at say 100hz. The question is whether I should just insert the events regardless of whether any rule actually uses the instances' event type (because the rete-oo will filter out the unused types very quickly) or whether I should add a filter before sesssion.insert(..) to let only those types of events that are actually used by a rule. My second problem/question then becomes: How to determine which types/classes are actually used in LHS patterns for a given package? By this I mean, how can I write code to make this determination. -- View this message in context: http://old.nabble.com/Does-Session-effeciently-filter-unused-facts%2C-or...-tp26489782p26505340.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] Does Session effeciently filter unused facts, or...
Ah, yes Edson. I didn't even think of that. That will probably force my hand to filter. But that then leaves me with how to determine the set of classes used in the rules. Doing it by textual inspection is not viable since rules can be added as part of the application (by users'). -- View this message in context: http://old.nabble.com/Does-Session-effeciently-filter-unused-facts%2C-or...-tp26489782p26507196.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] Does Session effeciently filter unused facts, or...
An option like that would be ideal. However it would also be nice to have the ability to determine the fact types so filtering pre fact-handle-creation/insertion can be done as well. In the meantime, for our current design at least, it will almost always be the case that we can scale out if we overload drools. ie, Have a separate thread/process per device (or subset), as the rules/cep processing is hierarchical. Higher levels will be consuming events generated by lower levels, but the rate of creation will decrease up the hierarchy. Edson Tirelli-4 wrote: For future versions, I think we should add a kbase configuration option to tell the engine what to do in case of facts that don't match any rule: either keep them (as it does today) or discard them right away. What do you think? -- View this message in context: http://old.nabble.com/Does-Session-effeciently-filter-unused-facts%2C-or...-tp26489782p26507232.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] Does Session effeciently filter unused facts, or...
... should I put a filter before insert(). I will have lots of events coming from hardware devices, only some of which be applicable to a given session instance. I've tried extracting the declared types from the packages, but that doesn't include classes used in patterns which where only imported. So determine the actual set of event classes used by a given set of packages seems not to be so easy. I've drilled down to EntryPointNode.assertObject.. -- View this message in context: http://old.nabble.com/Does-Session-effeciently-filter-unused-facts%2C-or...-tp26489782p26489782.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] Can't use global in RHS constructor call
In the following, [A] works but [B] yields the exception below. Is this some
kind of limitation of MVEL?
dialect mvel
...
global StateFactory stateFactory
global String NotOperating
...
rule transition
when
...
then
newState = stateFactory(NotOpering) // [A]
newState = new State(NotOperating) // [B]
end
--
Caused by: [Error: unable to access property (null parent): NotOperating]
[Near : {... Unknown }]
^
[Line: 1, Column: 0]
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:860)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:584)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:312)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)
at
org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:41)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileConstructor(ReflectiveAccessorOptimizer.java:1090)
at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeObjectCreation(ReflectiveAccessorOptimizer.java:1047)
at
org.mvel2.ast.NewObjectNode.getReducedValueAccelerated(NewObjectNode.java:158)
at
org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
at
org.mvel2.ast.AssignmentNode.getReducedValueAccelerated(AssignmentNode.java:89)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:104)
at org.mvel2.MVEL.executeExpression(MVEL.java:995)
at
org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:87)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:966)
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[rules-users] immediate vs path bound variables wrt performance?
The docs state that == with bound variables is very fast due to hashing. The example only shows a simple bound value, eg Person( likes : favouriteCheese ) Cheese( type == likes ) In the following will drools create an implicit hashed variable for '$p.likes' and yield the same performance? $p : Person( ) Cheese( type == $p.likes ) -- View this message in context: http://www.nabble.com/immediate-vs-path-bound-variables-wrt-performance--tp25269900p25269900.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] immediate vs path bound variables wrt performance?
Ok, I think I just found my answer, from 4.8.2.1 'Note: Nested accessors have a much greater performance cost than direct field accesses, so use them carefully. But is the simple case in the previous post considered nested? -- View this message in context: http://www.nabble.com/immediate-vs-path-bound-variables-wrt-performance--tp25269900p25269967.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] Order matters!
Found my problem. I was invoking kbuilder.add(..) for the declarations /after/ the rules. Simply switching the order fixed the problem. -- View this message in context: http://www.nabble.com/Share-%27declare%27-by-adding-drl-to-KnowledgeBuilder--tp25208077p25216742.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] Not conditional 'not' for event streams?
I'm trying to formulate a condition like: $se : StartEvent() from entry-point stream $fe : FinishedEvent(exchangeId == $se.exchangeId, this after[0s,30s] $se) from entry-point stream not AbortedEvent(exchangeId == $se.exchangeId, this after[0s,30s] $se) from entry-point stream A compile error is issued due to the use of 'not' on the last clause. Is this not supported? Is there another way to obtain this behavior. Even this simple clause is not value: not AbortedEvent() from entry-point stream The corresponding esper for this would be something like: select * from pattern [every s=StartEvent - (f=FinishedEvent(exchangeId = s.echangeId) where timer:within(30 sec) and not AbortedEvent(exchangeId = s.echangeId) where timer:within(30 sec)] -- View this message in context: http://www.nabble.com/Not-conditional-%27not%27-for-event-streams--tp25217095p25217095.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] Conditional 'not' invalid for event streams?
Well, I seem to have gotten past the compilation error by using parens: ... not (AbortedEvent(exchangeId == $se.exchangeId, this after[0s,30s] $se) from entry-point stream) But my rule does not fire as expected. Has anybody formed a rule like this with events? (BTW, does the Rete Tree in eclipse have any practical function, given that none of the nodes are labeled?) -barry -- View this message in context: http://www.nabble.com/Conditional-%27not%27-invalid-for-event-streams--tp25217095p25217265.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] Conditional 'not' invalid for event streams?
After looking at ../integrationtests/test_CEP_DelayingNot.drl I'm getting
closer, but not really understanding. I can get a greenbar with the below.
However if change the last advanceTime() value to anything less than 30 the
test fails. So it seems that the the conditional not clause does not start
its window until the first two clauses are true.
Why would this be? Why does it not start ticking when the first StartEvent
is inserted?
rule [every s-f!a] How do I use patterns to correlate events arriving
in-order or out-of-order?
when
$se : StartEvent($exchangeId : exchangeId)
from entry-point stream
$fe : FinishedEvent(exchangeId == $exchangeId, this after[0s,30s] $se)
from entry-point stream
not (AbortedEvent(exchangeId == $exchangeId, this after[0s,30s] $se)
from entry-point stream)
then
results.put(startEvent, $se);
results.put(finishedEvent, $fe);
end
@Test
def void
How_do_I_use_patterns_to_correlate_events_arriving_in_order_or_out_of_order__B()
{
insert new StartEvent(id: se1, exchangeId: BBB)
advanceTime 10, SECONDS
fireAllRules()
assert results.isEmpty()
advanceTime 10, SECONDS
insert new FinishedEvent(id: fe1, exchangeId: BBB)
fireAllRules()
assert results.isEmpty()
advanceTime 30, SECONDS
assert results[startEvent].id == se1
assert results[finishedEvent].id == fe1
}
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[rules-users] Behavioral differences between session.insert() and entryPoint.insert()?
I am seeing different behavior whether I insert events directly into session
or into a named entry-point.
The below rule and test is greenbar'ed:
rule How_do_I_correlate_events_arriving_in_2_or_more_streams?
when
$e : WithdrawalEvent($accountNumber : accountNumber, $amount : amount)
over window:time(30s)
from entry-point stream
$f : FraudWarningEvent(accountNumber == $accountNumber) over
window:time(30s)
from entry-point stream
then
results.put(accountNumber, $accountNumber);
results.put(amount, $amount);
end
def insert(fact) {
session.getWorkingMemoryEntryPoint(stream).insert(fact)
}
@Test
def void How_do_I_correlate_events_arriving_in_2_or_more_streams() {
// Not the same account
insert new WithdrawalEvent(accountNumber: AAA, amount: 100)
insert new FraudWarningEvent(accountNumber: BBB)
fireAllRules()
assert results.isEmpty()
// Not within the 30s window
advanceTime 31, SECONDS
insert new FraudWarningEvent(accountNumber: AAA)
fireAllRules()
assert results.isEmpty()
}
But if I do not specify a stream in the rules (ie, remove the 'from
entry-point stream') and instead insert directly into the session (like
many of the the drools integration do)...
def insert(fact) {
session.insert(fact)
}
...the test fails. It does not matter how far I advance the clock before
inserting the (second) FraudWarningEvent, the rule always fires.
I only found this difference after looking at the integration tests and
seing that I did not need to use a named entry-point for events. Did I
understand incorrectly? (I was looking at
/drools-compiler/src/test/resources/org/drools/integrationtests/test_CEP_DelayingNot.drl
and its associated java test.)
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Re: [rules-users] Conditional 'not' invalid for event streams?
Good evening Edson, I am using insert time -- the event classes have no timestamps properties. BTW, I have git project with all this code, but I don't think this last bit is pushed yet... (http://github.com/memelet/drools-esper/tree/master). Maybe once I've gotten thru the pattersn we can add it to drools-contrib as additional examples? -barry -- View this message in context: http://www.nabble.com/Conditional-%27not%27-invalid-for-event-streams--tp25217095p25218351.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] clock.advanceTime behaviour?
I've been using esper for some time with great success. But the appeal of
having integrated rules is overwhelming. To get familiar with Fusion, I'm
trying to implement the esper patterns, yet I and am stuck on the very first
one:
How do I measure the rate of arrival of events in a given time period?
- select count(*) as cnt from MarketDataEvent.win:time_batch(1 second)
For now I'm just trying to get my rule to fire at all, so its not really
trying to count just trigger when the number events in the window exceeds a
certain number. (But I admit, I'm not sure how to just the get running count
over the window, so if anybody knows...):
declare MarketDataEvent
@role(event)
end
rule How do I measure the rate of arrival of events in a given time
period?
when
$count : Long( longValue 5) from accumulate (
$e: MarketDataEvent() over window:time(1s) from entry-point
stream, count($e))
then
System.out.println(* 5);
end
My test driver is just inserting events every 10ms:
(1..10).each {
drools.clock.advanceTime(10, TimeUnit.MILLISECONDS)
drools.entryPoint.insert(new MarketDataEvent(it as String))
drools.session.fireAllRules()
}
If I do /not/ advance the clock, then I rule fires each time after the 5th
insert. But if the clock /is/ advanced (at any increment) then the rule
never fires.
Any clues what I might be missing?
thanks!
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Re: [rules-users] clock.advanceTime behaviour?
The @expires( 10s ) did the trick. (I was already in stream mode). I was just debugging down into WorkingMemoryReteExpireAction and was saw that every time I advanced the clock the events in the window were evicted. I guess this is the 5.0.1 bug. Are there maven snapshot builds? I'll be happy to use those. thanks very much Edson! -- View this message in context: http://www.nabble.com/clock.advanceTime-behaviour--tp25205578p25207390.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] clock.advanceTime behaviour?
I'm building 5.1.0-SNAPSHOT now... Is there already some support batch windows in there now? -- View this message in context: http://www.nabble.com/clock.advanceTime-behaviour--tp25205578p25207433.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] Share 'declare' by adding drl to KnowledgeBuilder?
I have a drl that only contains a declare statement. When I load a drl containing rules I also load that drl. But when the rule executes I get an error which is the same as if I didn't have the declare. When I debug and check the PackageDescr for the drl containing the 'declare' the TypeDeclarationDescr is in the package and seems to have the correct values. Both the rule and the drl with the 'declare' are in the same package: declartions.drl: --- package memelet.droolsesper import memelet.droolsesper.MarketDataEvent declare MarketDataEvent @role(event) @expires(10s) end --- rule.drl: --- package memelet.droolsesper import memelet.droolsesper.ArrivalRate global ArrivalRate arrivalRate rule How do I measure the rate of arrival of events in a given time period? /* select count(*) as cnt from MarketDataEvent.win:time_batch(1 second) */ /* 5.0.1 does not support 'time_batch', so the best we can do is capture the continous count. */ when $rate : Long() from accumulate ( $e: MarketDataEvent() over window:time(1s) from entry-point stream, count($e)) then arrivalRate.value = $rate; end --- -- View this message in context: http://www.nabble.com/Share-%27declare%27-by-adding-drl-to-KnowledgeBuilder--tp25208077p25208077.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] DSL debugging?
Also, I get these below errors, which seems to indicate that something is very wrong with rule parser. Like it cannot parse anything because of the expander? [25] Unable to expand: Strategy strategy = new Strategy(drools.getRule().getName(), 1, [26] Unable to expand: new StrategyLeg(LongShort.LONG, availableQuantity, equity)); [27] Unable to expand: insertLogical(strategy); [6] Unable to expand: equity : EquityInstrument()[8] Unable to expand: position : Position([9] Unable to expand: instrument == equity,[10] Unable to expand: longShort == LongShort.SHORT,[11] Unable to expand: quantity 0)[13] Unable to expand: legsQuantity : Integer(intValue position.quantity)[14] Unable to expand: from accumulate( StrategyLeg([15] Unable to expand: priority 1,[16] Unable to expand: instrument == equity,[17] Unable to expand: longShort == LongShort.SHORT,[18] Unable to expand: legQuantity : quantity )[19] Unable to expand: legsQuantity(legQuantity) )[22] Unable to expand: int availableQuantity = position.getQuantity() - legsQuantity; [23] Unable to expand: Strategy strategy = new Strategy(drools.getRule().getName(), 1, [24] Unable to expand: new StrategyLeg(LongShort.SHORT, availableQuantity, equity)); [25] Unable to expand: insertLogical(strategy); -- View this message in context: http://www.nabble.com/DSL-debugging--tp18095970p18096038.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] LHS reuse?
I have a set of rules that /all/ contain the following condition... positionQuantityAllocatedToLegs : Integer(intValue position.quantity) from accumulate( StrategyLeg(priority 1, instrument == equity, longShort == LongShort.LONG, legQuantity : quantity ) legsQuantity(legQuantity) ) ...the only difference being the values for the StrategyLeg. It would be very nice if there was some way to create reusable LHS constructs, say maybe something like: positionQuantityAllocatedToLegs : legsAllocation(1, position.quantity, LongShort.LONG) Where 'legsAllocation' is replaced with the condition above. Is there such a mechanism, or need I simply live with large amounts of duplication in my LHS? thanks! -- View this message in context: http://www.nabble.com/LHS-reuse--tp17986260p17986260.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] No accumulator function found for identifier
Is there any other magic for the IDE to see this file? With drools.packagebuilder.conf in my windows home directory I still get the IDE error. Also, for my environment I'm not using a property file at runtime -- I create the properties in code and construct a PackageBuilderConfiguration. It would be nice if there was another way to configure the IDE that is compatible for this supported use of the API. -barry -- View this message in context: http://www.nabble.com/No-accumulator-function-found-for-identifier-tp17339463p17932670.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] question on rule efficiency
When the value of a property is compared across two instances, is it better to create variables for the properties, or is using the object.property for the comparison equivalent? Here's an example: I need to match based on the strikePrice property. Is either version better than the other? version 1) putContract : OptionInstrument( optionType == OptionType.PUT) callContract : OptionInstrument( optionType == OptionType.CALL, strikePrice putContract.strikePrice) // compare using navigation version 2) putContract : OptionInstrument( optionType == OptionType.PUT, putStrikePrice : strikePrice) // delcare the variable callContract : OptionInstrument( optionType == OptionType.CALL, strikePrice putStrikePrice) // compare using variable -- View this message in context: http://www.nabble.com/question-on-rule-efficiency-tp17672843p17672843.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] Matching on instanceof without eval?
Edson, I do not assert the Instruments, on the Positions which contains multiple Instruments. I an trying to match Option Positions (ie, Positions that contain one or more Option legs). What I did was... when position : Position(option : instrument, option.class == OptionInstrument) ...and this works correctly. Is the above more or less efficient than using eval or the from-clause? It certainly is easier to read. thanks! -barry -- View this message in context: http://www.nabble.com/Matching-on-instanceof-without-eval--tp17425953p17453068.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] Matching on instanceof without eval?
I would like to match on the class of a field. I know I can use eval(option instanceof OptionInstrument), but my understanding is that the use of eval precludes indexing. What I want is something like the below, which does not work. Is some other mechanism other than putting type codes that are redundant with the class for this use case? thanks! rule Long Call/Put, Short Uncovered Call/Put when position : Position(option : instrument, option.class == OptionInstrument.class) then ... end -- View this message in context: http://www.nabble.com/Matching-on-instanceof-without-eval--tp17425953p17425953.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] Matching on instanceof without eval?
Ok, I figured it out. Just a small typo on my part: ... option.class = OptionInstrument ... not ... option.class = OptionInstrument.class ... -- View this message in context: http://www.nabble.com/Matching-on-instanceof-without-eval--tp17425953p17427082.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] debugging with 3.1M1 IDE?
Well, I just checked out head and rebuilt the IDE with both the feature and plugin. But I get no drools launch type (BTW, The ant/maven build seem to run clean. But importing the drools projects into eclipse results in lots of projects with errors. Is this expected for M1.) -barry ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] debugging with 3.1M1 IDE?
::--)) I installed a fresh eclipse 3.2.2 and drools as the only plugin. All works!!! Then I added back all my plugins, and all /still/ works good. So, who knows. Who cares. Now I can have fun. Thanks all!!! -barry ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] FYI: IDE 3.1M1 does not work with eclipse 3.3M5
The problems seems to be the jar container created by the plugin in the project. In 3.3M5 it seems to only have the JDT. So for example classes like RuleBase and WorkingMemory are not found. This not really a problem for me since I'm going to add the jars to the project directly (as opposed to using the eclipse plugin.) But I'm not sure yet whether the compiler or debugger will work with 3.3M5. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
