Is it required to use WorkingMemory.update to update an existing fact? I thought if assert behavior was set to equality and you implemented the equals method properly, then you could simply use WorkingMemory.insert to overwrite a fact in working memory with a new version. If this isn't the case, then are there other settings that will give this behavior? I'm using 4.0.7. Thanks for any help. Eric Here's my RuleBaseConfiguration: AlphaNodeHashingThreshold : 3 CompositeKeyDepth : 3 ExecutorServiceorg.drools.concurrent.DefaultExecutorService RuleBaseUpdateHandler : org.drools.base.FireAllRulesRuleBaseUpdateListener AgendaGroupFactory : org.drools.common.PriorityQueueAgendaGroupFactory@17653ae AssertBehaviour : equality ConflictResolver : org.drools.conflict.DepthConflictResolver@16fe0f4 ConsequenceExceptionHandler : org.drools.base.DefaultConsequenceExceptionHandler@19d0a1 LogicalOverride : discard SequentialAgenda : sequential AlphaMemory : false IndexLeftBetaMemory : true IndexRightBetaMemory : true MaintainTms : true RemoveIdenities : true Sequential : false ShadowProxy : true ShareAlphaNodes : true ShareBetaNodes : true UseStaticObjensis : false My TestFact class: public class TestFact { private String id; private String value; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } @Override public int hashCode() { return id.hashCode(); } @Override public boolean equals(Object obj) { if (this == obj) return true; if (!(obj instanceof TestFact)) return false; TestFact other = (TestFact) obj; // not null safe, i know return this.id.equals(other.id); } } And the JUnit Test Case that fails: public void testFactUpdate() throws Exception { TestFact testFact = new TestFact(); testFact.setId("1234"); testFact.setValue("old"); FactHandle testFactHandle = workingMemory.insert(testFact); TestFact updatedFact = new TestFact(); updatedFact.setId("1234"); updatedFact.setValue("new"); FactHandle updatedFactHandle = workingMemory.insert(updatedFact); // using workingMemory.update here works // passes assertTrue(testFactHandle == updatedFactHandle); TestFact retrievedTestFact = (TestFact) workingMemory.getObject(testFactHandle); // fails assertEquals("new", retrievedTestFact.getValue()); } _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Thanks. What I've done is add an insertOrUpdate method on a util class we use. How efficient is getFactHandle? Is it a simple HashMap lookup? Or would we be better off keeping our own map of handles->facts? public static FactHandle insertOrUpdate(Object fact, boolean dynamic) { FactHandle factHandle = workingMemory.getFactHandle(fact); if (factHandle == null) { return workingMemory.insert(fact, dynamic); } workingMemory.update(factHandle, fact); return factHandle; } ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: Saturday, May 31, 2008 9:12 AM To: Rules Users List Subject: Re: [rules-users] Updating an existing fact w/o using fact handle Nope. You must use the update method. You can get the previous fact handle using the get method in working memory if you still have the original non-modified object, or if behavior is equals based, using an equals object. [] Edson 2008/5/30 Fenderbosch, Eric <Eric.Fenderbosch(a)fedex.com&gt;: Is it required to use WorkingMemory.update to update an existing fact? I thought if assert behavior was set to equality and you implemented the equals method properly, then you could simply use WorkingMemory.insert to overwrite a fact in working memory with a new version. If this isn't the case, then are there other settings that will give this behavior? I'm using 4.0.7. Thanks for any help. Eric Here's my RuleBaseConfiguration: AlphaNodeHashingThreshold : 3 CompositeKeyDepth : 3 ExecutorServiceorg.drools.concurrent.DefaultExecutorService RuleBaseUpdateHandler : org.drools.base.FireAllRulesRuleBaseUpdateListener AgendaGroupFactory : org.drools.common.PriorityQueueAgendaGroupFactory@17653ae AssertBehaviour : equality ConflictResolver : org.drools.conflict.DepthConflictResolver@16fe0f4 ConsequenceExceptionHandler : org.drools.base.DefaultConsequenceExceptionHandler@19d0a1 LogicalOverride : discard SequentialAgenda : sequential AlphaMemory : false IndexLeftBetaMemory : true IndexRightBetaMemory : true MaintainTms : true RemoveIdenities : true Sequential : false ShadowProxy : true ShareAlphaNodes : true ShareBetaNodes : true UseStaticObjensis : false My TestFact class: public class TestFact { private String id; private String value; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getValue() { return value; } public void setValue(String value) { this.value = value; } @Override public int hashCode() { return id.hashCode(); } @Override public boolean equals(Object obj) { if (this == obj) return true; if (!(obj instanceof TestFact)) return false; TestFact other = (TestFact) obj; // not null safe, i know return this.id.equals(other.id); } } And the JUnit Test Case that fails: public void testFactUpdate() throws Exception { TestFact testFact = new TestFact(); testFact.setId("1234"); testFact.setValue("old"); FactHandle testFactHandle = workingMemory.insert(testFact); TestFact updatedFact = new TestFact(); updatedFact.setId("1234"); updatedFact.setValue("new"); FactHandle updatedFactHandle = workingMemory.insert(updatedFact); // using workingMemory.update here works // passes assertTrue(testFactHandle == updatedFactHandle); TestFact retrievedTestFact = (TestFact) workingMemory.getObject(testFactHandle); // fails assertEquals("new", retrievedTestFact.getValue()); } _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users