[rules-users] Updating an existing fact w/o using fact handle

[Edson Tirelli]

   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 at fedex.com>:

> 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 at 17653ae
> AssertBehaviour : equality
> ConflictResolver : org.drools.conflict.DepthConflictResolver at 16fe0f4
> ConsequenceExceptionHandler :
> org.drools.base.DefaultConsequenceExceptionHandler at 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());
>        }
>
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>



-- 
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
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