[rules-users] Behavioral differences between session.insert() and entryPoint.insert()?

[Barry Kaplan]

I am seeing different behavior whether I insert events directly into session
or into a named entry-point. 

The below rule and test is greenbar'ed:

----
rule "How_do_I_correlate_events_arriving_in_2_or_more_streams?"
when
    $e : WithdrawalEvent($accountNumber : accountNumber, $amount : amount)
over window:time(30s) 
        from entry-point "stream"
    $f : FraudWarningEvent(accountNumber == $accountNumber) over
window:time(30s) 
        from entry-point "stream"    
then
    results.put("accountNumber", $accountNumber);
    results.put("amount", $amount);
end
----
	def insert(fact) { 
		session.getWorkingMemoryEntryPoint("stream").insert(fact)
	}

	@Test
	def void How_do_I_correlate_events_arriving_in_2_or_more_streams() {
		// Not the same account
		insert new WithdrawalEvent(accountNumber: "AAA", amount: 100)
		insert new FraudWarningEvent(accountNumber: "BBB")
		fireAllRules()
		assert results.isEmpty()

		// Not within the 30s window
		advanceTime 31, SECONDS
		insert new FraudWarningEvent(accountNumber: "AAA")
		fireAllRules()
		assert results.isEmpty()

		....
	}
----

But if I do not specify a stream in the rules (ie, remove the 'from
entry-point "stream"') and instead insert directly into the session (like
many of the the drools integration do)...

	def insert(fact) { 
		session.insert(fact)
	}

...the test fails. It does not matter how far I advance the clock before
inserting the (second) FraudWarningEvent, the rule always fires. 

I only found this difference after looking at the integration tests and
seing that I did not need to use a named entry-point for events. Did I
understand incorrectly? (I was looking at
/drools-compiler/src/test/resources/org/drools/integrationtests/test_CEP_DelayingNot.drl
and its associated java test.)

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