Re: [rules-users] Two version of hibernate in the same classpath, how to specify thecorrect version to be used in drools ?
hi, I'm not sure if its possible to achieve it as you might get e.g. missing method/missing class exception if you start mixing different versions of hibernate artifacts. I'm afraid that the only safe solution would be running your workflow process in its own JVM. You might want to have a look on drools-server and check if it does what you want. I know it can run rules and return results back to the calling application but i'm not sure about workflows. good luck :) On 26/05/2011 14:36, JAMAL Moundir (EXT) wrote: versions of the hibernate in the same classpath whichs made several problems. Maybe I can use another implementation of JPA with drools, but It will be difficult to change the pers -- Greg Stasica PaceMetrics Ltd. T +353 1 8849921 PaceMetrics Limited is registered in Ireland as a private company limited by shares, Registration No. 298243, Registered office: PaceMetrics House, East Point Business Park, Dublin 3. This e-mail may contain confidential, proprietary or privileged information. If you are not the intended recipient (or have received this e-mail in error) please destroy this e-mail and notify the sender immediately by telephoning +353 1 8184000. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] [Drools Flow 5.1] persistence + spring + localTransaction
hi, sorry but i've never tried to use something else. My application uses spring so there was no other option for me. On 25/05/2011 20:16, anton.litvinenko wrote: Greg, were you able to achieve process persistence in other configurations? (e.g. without spring?) I don't use drools-spring bean factories to instantiate KnowledgeAgent and KnoweldgeBase (instead i created alternative factories) + the following JPA definition and spring context persistence.xml: ?xml version=1.0 encoding=UTF-8 standalone=yes? persistence version=1.0 xsi:schemaLocation=http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd; xmlns:orm=http://java.sun.com/xml/ns/persistence/orm; xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; xmlns=http://java.sun.com/xml/ns/persistence; persistence-unit name=org.drools.persistence.jpa providerorg.hibernate.ejb.HibernatePersistence/provider classorg.drools.persistence.session.SessionInfo/class classorg.drools.persistence.processinstance.ProcessInstanceInfo/class classorg.drools.persistence.processinstance.ProcessInstanceEventInfo/class classorg.drools.persistence.processinstance.WorkItemInfo/class classorg.drools.persistence.processinstance.variabletypes.VariableInstanceInfo/class classorg.drools.persistence.processinstance.variabletypes.SerializablePersistedVariable/class classorg.drools.persistence.processinstance.variabletypes.JPAPersistedVariable/class properties property name=hibernate.dialect value=org.hibernate.dialect.PostgreSQLDialect/ property name=hibernate.max_fetch_depth value=3/ property name=hibernate.hbm2ddl.auto value=update/ property name=hibernate.show_sql value=true/ property name=hibernate.connection.autocommit value=false/ /properties /persistence-unit /persistence ApplicationContext.xml: bean id=entityManagerFactory class=org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean property name=dataSource ref=dataSource/ property name=loadTimeWeaver bean class=org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver/ /property /bean jee:jndi-lookup id=dataSource jndi-name=jdbc/flowengine/ bean id=transactionManager class=org.springframework.orm.jpa.JpaTransactionManager constructor-arg type=javax.persistence.EntityManagerFactory ref=entityManagerFactory/ /bean tx:annotation-driven transaction-manager=transactionManager/ This kinda works, but I have to start transaction manually before invoking any method on Drools Flow. And of course if an exception happens during the invocation then everything is rolled back (e.g. process with 3 steps and the last step crashes then process state in database is not updated with 2 first steps). Is it possible to configure Drools Flow to start/commit transaction at before/after process step? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Flow-5-1-persistence-spring-localTransaction-tp2875263p2985689.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Greg Stasica PaceMetrics Ltd. T +353 1 8849921 PaceMetrics Limited is registered in Ireland as a private company limited by shares, Registration No. 298243, Registered office: PaceMetrics House, East Point Business Park, Dublin 3. This e-mail may contain confidential, proprietary or privileged information. If you are not the intended recipient (or have received this e-mail in error) please destroy this e-mail and notify the sender immediately by telephoning +353 1 8184000. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] [Drools Flow 5.1] Updating a process definition - Proceed updates running processes
hi, it's a long shot and by far should not be treated as something definite (i haven't checked the source code), but i suspect that you've just found another bug in JPA/persistence implementation. I agree with salaboy that once process has been updated only new processes should run with the newer version (all existing ones should run with the old version). But, if the events sequence is like below: 1. start process P1 2. persist session S1 (process not completed) 3. update process 4. restart server (just to reload persisted session) 5. load S1 and continue process P1 i suspect that due to the fact that persisted session persists only process_id when the same is loaded from the store all it sees is a new version of the process (hence your situation) on the other hand if no persistence is being used there is no problem at all because running process won't see any changes being made to the process definition etc. On 25/05/2011 20:44, anton.litvinenko wrote: I tried exactly that and my already running process continued with the *updated* process version. I have a process with 3 nodes: Action Node (writing to system.out) = Async Work Item (makes request and then waits for async result - not blocking) = Action Node (writing to system.out) So, I experimented like this: 1. started the process, saw first system.out, saw making request 2. updated the process to have a different system.out at last action node, deployed it to Guvnor, waited for KnowledgeAgent to pick it up 3. sent response to the process at Async Work Item - saw *new* system.out at the last node. Am i doing something wrong? Or have wrong expectations? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Flow-5-1-Updating-a-process-definition-Proceed-updates-running-processes-tp2928103p2985817.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Greg Stasica PaceMetrics Ltd. T +353 1 8849921 PaceMetrics Limited is registered in Ireland as a private company limited by shares, Registration No. 298243, Registered office: PaceMetrics House, East Point Business Park, Dublin 3. This e-mail may contain confidential, proprietary or privileged information. If you are not the intended recipient (or have received this e-mail in error) please destroy this e-mail and notify the sender immediately by telephoning +353 1 8184000. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Accessing globals after FireAllRules
Awesome! This worked Thank you very much Wolfgang!! Though, I have a architectural question My use case is in claims processing and here are the steps that need to happen 1) Recieve patients claim (prescription claim, like medicines) 2) Retrieve the patients Claim History (use patient ID in claim) 3) Retrieve the drug information (use RxID in claim) 4) Subject the claim to the rules in drools 5) Respond with rule results (show the contributing claims that caused the rules to fire) for this , I created a Rule flow Step 2) and 3) are rule tasks that ONLY fetch information Step 4) I want to write the rules (mix of java helper classes and drl) and subject the claim to that Step 5) return the results (via the List option that you just gave me) Is this the way people use the Rule Flow? Do you see anyting fundamentally wrong here? Do you think I should you Stateless sessions instead of rule flow? Do let me know -- View this message in context: http://drools.46999.n3.nabble.com/Accessing-globals-after-FireAllRules-tp2989144p2992639.html Sent from the Drools: User forum 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] Releases: Drools (Expert, Fusion, Planner) 5.2.0.CR1, Guvnor 5.2.0.CR1 and jbpm 5.1.0.CR1
Get them while they are hot. http://blog.athico.com/2011/05/releases-drools-expert-fusion-planner.html -- With kind regards, Geoffrey De Smet ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] DSL Entry Question
Hi,
The 5.2 docs list the following example DSL entry
[when][][Tt]here is an? {entity:\w+}=${entity!lc}: ${entity!ucfirst} ()
and say the following about what follows the equals sign
The remaining part of the line after the delimiting equal sign is the
replacement text for any DSLR text matching the regular expression. It may
contain variable references, i.e., a variable name enclosed in braces.
What does the colon following the first variable do? I'm guessing it acts as
an OR? I didn't see any explanation of this and I don't *think* this is
regex.
Also, I'm used to (and actually understand) the following syntax which does
not prefix { with a $.
[when]There is some {cheese} cheese available=Cheese(type=={cheese})
My best guess is that the $ denotes a class name that is specified
declaratively in the matching DSLR rule as opposed to a field {cheese} that
is simply a replaceable parameter that matches whatever you type between
some and cheese available and looks for Cheese objects of that type. So,
given the first DSL entry, if my rule text is
when
there is a cheese
the rule will fire if a Cheese object has been inserted. And, conversely
when
There is an Cheese
will also fire.
Am I on the right track here?
Thanks,
Jeff
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Re: [rules-users] Accessing globals after FireAllRules
Although not an expert on Flow, I can say that there can hardly be anything fundamentally wrong with this brief Flow, where a simpler solution might be equally possible. Much depends on other circumstances, e.g., possible future developments, deployment, workload,... -W On 27 May 2011 14:18, sdinoo sdi...@gmail.com wrote: Awesome! This worked Thank you very much Wolfgang!! Though, I have a architectural question My use case is in claims processing and here are the steps that need to happen 1) Recieve patients claim (prescription claim, like medicines) 2) Retrieve the patients Claim History (use patient ID in claim) 3) Retrieve the drug information (use RxID in claim) 4) Subject the claim to the rules in drools 5) Respond with rule results (show the contributing claims that caused the rules to fire) for this , I created a Rule flow Step 2) and 3) are rule tasks that ONLY fetch information Step 4) I want to write the rules (mix of java helper classes and drl) and subject the claim to that Step 5) return the results (via the List option that you just gave me) Is this the way people use the Rule Flow? Do you see anyting fundamentally wrong here? Do you think I should you Stateless sessions instead of rule flow? Do let me know -- View this message in context: http://drools.46999.n3.nabble.com/Accessing-globals-after-FireAllRules-tp2989144p2992639.html Sent from the Drools: User forum 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] DSL Entry Question
On 27 May 2011 16:24, jstroup jstr...@regenstrief.org wrote:
Hi,
The 5.2 docs list the following example DSL entry
[when][][Tt]here is an? {entity:\w+}=${entity!lc}: ${entity!ucfirst} ()
Oops, there is a spurious '$', the second one. It should be
=${entity!lc}: {entity!ucfirst} ()
and say the following about what follows the equals sign
The remaining part of the line after the delimiting equal sign is the
replacement text for any DSLR text matching the regular expression. It may
contain variable references, i.e., a variable name enclosed in braces.
What does the colon following the first variable do?
The colon in ...=${entity!lc}: {entity!ucfirst} () will remain a colon,
after expansion. It's the colon after a binding variable.
Also, I'm used to (and actually understand) the following syntax which does
not prefix { with a $.
[when]There is some {cheese} cheese available=Cheese(type=={cheese})
My best guess is that the $ denotes a class name that is specified
declaratively in the matching DSLR rule as opposed to a field {cheese} that
is simply a replaceable parameter that matches whatever you type between
some and cheese available and looks for Cheese objects of that type.
So,
given the first DSL entry, if my rule text is
when
there is a cheese
the rule will fire if a Cheese object has been inserted. And, conversely
when
There is an Cheese
will also fire.
Since both expand to
$cheese: Cheese ()
Am I on the right track here?
yes, and thanks for the Q.
-W
Thanks,
Jeff
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[rules-users] Thread hung while trying to addKnowledgePackages
Hi, I am trying to do some drools calls on startup of application server(Websphere) and the server gets hung at a point and shows the following warnings. Any pointers or help appreciated. [5/26/11 17:28:02:977 EDT] 0020 ThreadMonitor W WSVR0605W: Thread SoapConnectorThreadPool : 1 (0028) has been active for 674145 milliseconds and may be hung. There is/are 1 thread(s) in total in the server that may be hung. at java.lang.ClassLoader.defineClassImpl(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:275) at org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:576) at org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:259) at org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:242) at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:89) at java.lang.ClassLoader.loadClass(ClassLoader.java:619) at org.drools.rule.JavaDialectRuntimeData.wire(JavaDialectRuntimeData.java:410) at org.drools.rule.JavaDialectRuntimeData.reload(JavaDialectRuntimeData.java:477) at org.drools.rule.JavaDialectRuntimeData.onBeforeExecute(JavaDialectRuntimeData.java:237) at org.drools.rule.DialectRuntimeRegistry.onBeforeExecute(DialectRuntimeRegistry.java:134) at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:513) at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:430) at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:143) Thanks, Nirmal -- View this message in context: http://drools.46999.n3.nabble.com/Thread-hung-while-trying-to-addKnowledgePackages-tp2993222p2993222.html Sent from the Drools: User forum 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] Rule Flow and Stateless Session
I'm having some difficulty getting a rule flow with a stateless session to work. Essentially, it is just executing the first task and then stops. I'm using Drools 5.1.1 and I just built the sample Drools by creating a new Drools Project. My rule flow is simple: Start-RuleGroup1-RuleGroup2-End I use the 2 rules from example, putting the Hello World in RuleGroup1 and Goodbye in RuleGroup2. Here's my code to run it: // load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, test); // start a new process instance Message message = new Message(); message.setMessage(Hello World); message.setStatus(Message.HELLO); ArrayList cmds = new ArrayList(); ArrayList dataList = new ArrayList(); dataList.add(message); cmds.add(CommandFactory.newInsertElements(dataList)); cmds.add(CommandFactory.newStartProcess(com.sample.ruleflow)); ksession.execute(CommandFactory.newBatchExecution(cmds)); logger.close(); When I run the rules, all I get is Hello World (no Goodbye cruel world). It does work with a Stateful Session using insert, startProcess, and fireAllRules, but this is a test using the rule flows with CommandFactory functionality, something we need for an application we are developing. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] [Drools Flow 5.1] Updating a process definition - Proceed updates running processes
Greg, your guess is correct! The process instance is in fact persisted in db for the period waiting for response in node 2. Guys from dev-team, do you agree that this is a bug and should be filled in Jira? -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Flow-5-1-Updating-a-process-definition-Proceed-updates-running-processes-tp2928103p2993612.html Sent from the Drools: User forum 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] Catch 22 ANTLR DSL matching issue
Hi Droolers,
Regarding this blurb from the 5.2 DSL reference:
It is important to note that the compiler transforms DSL rule files line by
line. In the above example, all the text after Something is to the end of
the line is captured as the replacement value for {colour}, and this is
used for interpolating the target string. This may not be exactly what you
want. For instance, when you intend to merge different DSL expressions to
generate a composite DRL pattern, you need to transform a DSLR line in
several independent operations. The best way to achieve this is to ensure
that the captures are surrounded by characteristic text - words or even
single characters. As a result, the matching operation done by the parser
plucks out a substring from somewhere within the line. In the example below,
quotes are used as distinctive characters. Note that the characters that
surround the capture are not included during interpolation, just the
contents between them.
Given this DSL (test_expander.dsl)
[when](C|c)heese is {type}=Cheese(type=={type})
[when](is|hails|comes) from {country}=Cheese(country=={country})
[then]Add the message {message}=System.out.println({message});
And this DSLR
package com.sample
import com.sample.DroolsTest.Cheese;
expander test_expander.dsl
rule rule_1
when
Cheese is cheddar and is from Italy
then
Add the message Cheddar IS from Italy
end
rule rule_2
when
cheese is cheddar and comes from Italy
then
Add the message Cheddar COMES from Italy
end
I know that rule_2 fails because I removed the “distinctive characters” so
ANTLR is confused on what to capture. It just seems so unnatural for a rule
author to have to somehow magically know to add quotes in order to merge
different DSL expressions to generate a composite DRL pattern. The
documentation suggests also surrounding it with distinctive words so I sneak
an “and” into the DSL entry.
[when](C|c)heese is {type} and=Cheese(type=={type})
This allows me to write my rules more naturally.
rule rule_1
when
Cheese is cheddar and is from Italy
then
Add the message Cheddar IS from Italy
end
rule rule_2
when
cheese is cheddar and comes from Italy
then
Add the message Cheddar COMES from Italy
end
In the first example the “and” in
Cheese is cheddar and is from Italy
is actually a logical AND - not a matching character – which is nice because
we can use it to logically connect the 2 expressions or just match the first
DSL expression by itself as in
Cheese is cheddar
And since the second expression is not present we can drop the quotes. (But
how on earth will a rule author know this?). But if we add the “and” as part
of the first DSL expression
1) It is no longer a connecting logical character but is part of the
expression to match (yuk)
2) We can no longer just write “Cheese is cheddar” by itself but are
forced to write “Cheese is cheddar and” if we want to match only the first
expression. You might as well just combined the two expressions into one
since there is no real advantage now to having two expressions!
One nice thing would be for the Guvnor DSL editor to
1)try the capture greedily first,
2)get the annoying “no viable alternative error”,
3)CATCH the error instead of just giving up,
4)capture non-greedily and match only the first word,
5)then search for matching DSL expressions beyond that.
Or something like that. The only time you should have to add quotes is if
the text you are matching actually contains multiple words. Anything else is
counter-intuitive. Please tell me the planned replacement for DSL addresses
this!
Jeff
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Re: [rules-users] Rule Flow and Stateless Session
Hi John, this is a known issue https://issues.jboss.org/browse/JBRULES-2718. The fix is in 5.2.0.CR1 which you can get from http://www.jboss.org/drools/downloads.html. Thanks. On 5/27/11 12:14 PM, John Peterson wrote: I'm having some difficulty getting a rule flow with a stateless session to work. Essentially, it is just executing the first task and then stops. I'm using Drools 5.1.1 and I just built the sample Drools by creating a new Drools Project. My rule flow is simple: Start-RuleGroup1-RuleGroup2-End I use the 2 rules from example, putting the Hello World in RuleGroup1 and Goodbye in RuleGroup2. Here's my code to run it: // load up the knowledge base KnowledgeBase kbase = /readKnowledgeBase/(); StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory./newFileLogger/(ksession, test); // start a new process instance Message message = *new* Message(); message.setMessage(Hello World); message.setStatus(Message./HELLO/); ArrayList cmds = *new* ArrayList(); ArrayList dataList = *new* ArrayList(); dataList.add(message); cmds.add(CommandFactory./newInsertElements/(dataList)); cmds.add(CommandFactory./newStartProcess/(com.sample.ruleflow)); ksession.execute(CommandFactory./newBatchExecution/(cmds)); logger.close(); When I run the rules, all I get is Hello World (no Goodbye cruel world). It does work with a Stateful Session using insert, startProcess, and fireAllRules, but this is a test using the rule flows with CommandFactory functionality, something we need for an application we are developing. ___ 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] Catch 22 ANTLR DSL matching issue
Correction: I meant the DSL Parser - Not the Guvnor DSL Editor. But the UI could politely ask the user what alternative IS viable since it has access to all of them. -- View this message in context: http://drools.46999.n3.nabble.com/Catch-22-ANTLR-DSL-matching-issue-tp2993923p2993959.html Sent from the Drools: User forum 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] drools date compare not working as documented
hi - i am using drools-distribution-5.2.0.M2. Here is the drl i am using - -- dialect mvel import com.deltadental.drools.sample.* rule Rule 01 when $underageCustomer : Customer(dob15-May-1993) $order : Order(customerId == $underageCustomer.customerId) eval($order.discountPercentage == 0) then $order.discountPercentage = 25; System.out.println(Rule 01 fired. Applied discount +$order.discountPercentage); end -- I get a RuntimeDroolsException: Exception executing predicate dob 15-May-1993 Caused by: java.lang.RuntimeException: uncomparable values Mon May 01 00:00:00 EDT 2000 and 15-May-1993 caused by a class cast exception - String cannot be converted to a Date. I get the same exception with 5.1.1. I tried the same setting Locale and drools.dateformat properties - no luck so far.. Am I missing something here? Thanks Muk -- View this message in context: http://drools.46999.n3.nabble.com/drools-date-compare-not-working-as-documented-tp2994330p2994330.html Sent from the Drools: User forum 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] Decision Tables with Business Rule Tasks?
You can add the ruleflow-group Attribute to the XLS form, or in Guvnor using the guided editor. Decision Tables compile to a common form that KnowledgeBuilder uses to create your engine; so AFAIK using them in a flow should not be a problem. With kind regards, Mike On 26 May 2011 22:03, mmcintosh michael.g.mcint...@citi.com wrote: Is it possible to use a decision table to specify the rule for a business rule task? How is the ruleFlowGroup specified? -- View this message in context: http://drools.46999.n3.nabble.com/Decision-Tables-with-Business-Rule-Tasks-tp2990517p2990517.html Sent from the Drools: User forum 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] drools date compare not working as documented
I got this test case to work with Drools 5.1.1 - but I think the latest 5.2 distribution has an issue with date comparision. -- View this message in context: http://drools.46999.n3.nabble.com/drools-date-compare-not-working-as-documented-tp2994330p2994394.html Sent from the Drools: User forum 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] Decision Tables with Business Rule Tasks?
Thanks for your response. I have not seen any example of this. Where does the ruleFlow-group attribute go on the spreadsheet? -- View this message in context: http://drools.46999.n3.nabble.com/Decision-Tables-with-Business-Rule-Tasks-tp2990517p2994420.html Sent from the Drools: User forum 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] Decision Tables with Business Rule Tasks?
The same place as any attribute, like Salience, Agenda-Group etc Section 5.1.4.2. Keywords in Drools Expert 5.1.1's documents talks about it a bit. Cheers, Mike On 27 May 2011 22:02, mmcintosh michael.g.mcint...@citi.com wrote: Thanks for your response. I have not seen any example of this. Where does the ruleFlow-group attribute go on the spreadsheet? -- View this message in context: http://drools.46999.n3.nabble.com/Decision-Tables-with-Business-Rule-Tasks-tp2990517p2994420.html Sent from the Drools: User forum 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] Catch 22 ANTLR DSL matching issue
See inline.
On 27 May 2011 20:19, jstroup jstr...@regenstrief.org wrote:
Hi Droolers,
Regarding this blurb from the 5.2 DSL reference:
[snip]
Given this DSL (test_expander.dsl)
[when](C|c)heese is {type}=Cheese(type=={type})
[when](is|hails|comes) from {country}=Cheese(country=={country})
[then]Add the message {message}=System.out.println({message});
And this DSLR
package com.sample
import com.sample.DroolsTest.Cheese;
expander test_expander.dsl
rule rule_1
when
Cheese is cheddar and is from Italy
then
Add the message Cheddar IS from Italy
end
This will not do what the text implies because the expansion is
Cheese(type==cheddar) Cheese(country===Italy)
and there is nothing that links these Cheese facts, which could
be one and the same but also any other pair matching the
individual constraints.
I know that rule_2 fails because I removed the “distinctive characters” so
ANTLR is confused on what to capture.
ANTLR has nothing to do with DSL expansion, which is entirely based on
regular expressions.
It just seems so unnatural for a rule
author to have to somehow magically know to add quotes in order to merge
different DSL expressions to generate a composite DRL pattern.
The DSL designer has a range of options (characters, buzz words,...) but at
the
end of the day (s)he will have to document it for the rule authors. There's
no
way they'll know what to write, out of the blue.
2) We can no longer just write “Cheese is cheddar” by itself but are
forced to write “Cheese is cheddar and” if we want to match only the first
expression. You might as well just combined the two expressions into one
since there is no real advantage now to having two expressions!
There is a feature for adding arbitrary constraints into a preceding
pattern.
One nice thing would be for the Guvnor DSL editor to
1)try the capture greedily first,
2)get the annoying “no viable alternative error”,
3)CATCH the error instead of just giving up,
4)capture non-greedily and match only the first word,
5)then search for matching DSL expressions beyond that.
Or something like that.
Exactly. There is the fundamental problem of different levels of grammars
for DRL and natural languages, and this can't be overcome easily.
The only time you should have to add quotes is if
the text you are matching actually contains multiple words. Anything else
is
counter-intuitive.
The DSL designer can avoid this, at the cost of slightly more verbose
phrases.
Please tell me the planned replacement for DSL addresses
this!
Feel free to contribute proposals (but not something like that, please).
Wolfgang
Jeff
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