[rules-users] Updating an existing fact w/o using fact handle
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());
}