February 2010 - rules-users - Jboss List Archives

Drools Flow: Variable Persistence Strategies

by Dale Wyttenbach

I'm trying to adapt the StringVariablePersister presented in http://blog.athico.com/2009/09/drools-flow-variable-persistence.html <http://blog.athico.com/2009/09/drools-flow-variable-persistence.html>I can create process instances with variable "color": private static WorkflowProcessInstance startProcess(StatefulKnowledgeSession ksession, String color) { Map<String, Object> vars = new HashMap<String, Object>(); vars.put("color", color); WorkflowProcessInstance p1 = (WorkflowProcessInstance) ksession.startProcess("com.sample.ruleflow", vars); return p1; } I can count them: select count(*) from ProcessInstanceInfo However I'm stymied as to counting process instances with a given color, as there appears to be no join column between ProcessInstanceInfo and VariableInstanceInfo. Can such a query be written? Thanks.

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What is the Best practice of using "Drools Fusion" in a Load balancing environment (ie temporal reasoning between 2 working memories)??

by Chetan Mahadev

Hi Can anyone tell me how to Implement temporal based event correlation using drools fusion in a load balancing environment. What is the best practice in a situation like this?? Use case : To correlate events which comes into the system with in a time window. Scenario1: Single System Scenario: that is One working memory 1.All the events come into the system, 2.Temporal based rules are written using Drools-Fusion. 3.Correlations takes place if all the events come with in the time window, else the rule expires. Note: All these takes place with in a single working memory ( Single System) Scenario2: Two System Scenario in active/active: that is two working memories 1.All the events come into the system, 2.Temporal based rules are written using Drools-Fusion. 3. Same rules are deployed in both the systems (active/active) 4.Both systems are load-balanced, 5. Event1 goes to System1, Event2 goes to System2 and again Event3 goes system1. ( load -balanced) As a result, System1 recieves 2 events out of 3 events, and System2 the other 1 event. Correlation never happens since I dont recieve all the events in a single working memory. How do we handle this kinda scenario?? Do we have any best practise that is followed in a clustered or load-balanced environment?? Pls help me.. I am stuck. Regds Chetan In a single system, Fusion/temporal based correlation works completely fine. Use case: I have a situation, where events flow into two active components (both running simultaneosly)

16 years, 4 months

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How to use Drools 5 TimeMachine for controlling effective dates?

by H.C.

Hey, I have a use case where we need to retroactively process data using rules, but with the rules that were effective at the time the data was created (maybe a year ago), not at the time the data is run through the engine (today). We are setting effective and expiration dates on our rules to accomplish this. I am now trying to figure out how to control the date the agenda sees against which it evaluates which rules are in effect. I understand the TimeMachine class is part of this control mechanism but I am not sure how to properly use it in the context of a session. We may have multiple stateless sessions executing at the same time and each session needs its own independent control over its date parameter. Thanks HC -- View this message in context: http://n3.nabble.com/How-to-use-Drools-5-TimeMachine-for-controlling-effe... Sent from the Drools - User mailing list archive at Nabble.com.

16 years, 4 months

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Drools

by Nilima R

Hi All , How to prevent the below important URL information available while building rule packages from unauthorized access. URL for package source: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/test... URL for package binary: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/test... URL for running tests: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/test... Status: . Nilima ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

16 years, 4 months

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Sending value to decision table ?

by mklaric

What if i want to send some value insted of object in the decision table, how will i write it RuleTable(Integer i) or ?? -- View this message in context: http://n3.nabble.com/Sending-value-to-decision-table-tp217042p217042.html Sent from the Drools - User mailing list archive at Nabble.com.

16 years, 4 months

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Decision table list problem ?

by mklaric

I have written this in my decision table, and i wan't to iterate over SubParamAttribute values, but it doesn't work, why ? The program runs normaly, but no action is fired. http://n3.nabble.com/file/n214823/ScreenShot020.jpg -- View this message in context: http://n3.nabble.com/Decision-table-list-problem-tp214823p214823.html Sent from the Drools - User mailing list archive at Nabble.com.

16 years, 4 months

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How to avoid clearing the rulebase in case of bad version of package found or no package found

by Sartaj Shaik

16 years, 4 months

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Question on use of Timer node in rule flow

by Alan.Gairey＠tessella.com

I'm currently experimenting with including a Timer node within a rule flow. My question is: what (if any) runtime state information is persisted by Drools Flow for a Timer node? I can recreate a session via a call to JPAKnowledgeService.loadStatefulKnowledgeSession, but if a process instance was previously on a Timer node, will it start from where it left off, or will the Timer delay start from the beginning again? For example, if I have a Timer node with a delay of 7 days, but the application is stopped / crashes after 6 days, then when I recreate my session, will the Timer node just wait 1 more day, or will the delay of 7 days start from scratch? Thanks in advance for any help, Alan

16 years, 4 months

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Decision table parameter problem ?

by mklaric

When i write this in decision table RuleTable example(Integer i, Integer j) i got exception : nvalid rule table header cell. Should be in the format of 'RuleTable YourRuleName'. It was: [RuleTable example(ParamAttribute p, Integer i)] why ? -- View this message in context: http://n3.nabble.com/Decision-table-parameter-problem-tp215178p215178.html Sent from the Drools - User mailing list archive at Nabble.com.

16 years, 4 months

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Flow and Rules Together - Best practice question

by J Michael Dean

Have been working solely with rules and have now created an overall rule flow that has enabled me to eliminate parts of the conditions of many rules, because the rules are in rule flow groups. For example, if the glucose value must be below 40 to get into a rule flow group called "Below 40", then I do not need to check that the glucose is below 40 in the condition of every rule in the group. I have noticed, however, that when a fact is inserted, it appears to activate all rules for which the conditions match, even though the majority of the rules are not in the rule flow group. I am interpreting this as simply activating everything applicable, taking advantage of the Rete, and then the activated rules are filtered by rule flow group. Is this a correct interpretation? The corollary question is whether I am using best practice by eliminating "redundant" conditions from my rules, or whether I should include in those conditions the constraints that were determining whether the rule flow group becomes active. If this scaled up to one to two thousand rules, would the activations and filtering be more costly? Thanks for any advice. My colleagues and I were very happy to eliminate the redundant conditions because it makes our rules look simpler, but now concerned may be going down wrong track. - Mike

16 years, 4 months

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rules-users February 2010