9:44 a.m.
Hi all. Respected experts of drools, please help me to understand how pattern
+ accumulate behave.
I believe that an example is the best way to explain the problem, maybe it
will look bulky, but suppose be enough.
I use CEP and EventProcessingOption.Stream.
Event class:
/public class ServicePerformanceEvent {
private String serviceName;
private Integer duration;
public ServicePerformanceEvent(String name, Integer duration) {
serviceName = name;
this.duration = duration;
}
}/
There are 2 tests, 1st - with fireAllRules invocation, 2nd - with
firwUntilHalt invocation.
/ @Test
public void *test1_FireAllRules() *throws RuleGeneratorException {
System.out.println("-= 1 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 2));
ksession.fireAllRules();
System.out.println("-= 2 =-");
ksession.insert(new ServicePerformanceEvent("AnotherService", 10));
ksession.fireAllRules();
System.out.println("-= 3 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 12));
ksession.fireAllRules();
System.out.println("---test1 end---");
}
@Test
public void *test2_FireUntilHalt()* throws RuleGeneratorException,
InterruptedException {
System.out.println("-= 1 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 2));
runFireUntilHaltThread();
Thread.sleep(1000);
System.out.println("-= 2 =-");
ksession.insert(new ServicePerformanceEvent("AnotherService", 10));
Thread.sleep(1000);
System.out.println("-= 3 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 12));
Thread.sleep(1000);
System.out.println("---test2 end---");
}/
There are 3 simple rules for which I performing tests:
*////First Rule:*
declare com.test.event.ServicePerformanceEvent
@role( event )
end
rule "ServicePerformanceEvent test rule1"
dialect "mvel"
when
$event : ServicePerformanceEvent(serviceName == "MyService");
then
System.out.println("$event.duration = " + $event.duration);
System.out.println("----------FIRED----------");
end
Invocation results of the test1_FireAllRules() and test2_FireUntilHalt() the
same:
-= 1 =-
$event.duration = 2
----------FIRED----------
-= 2 =-
-= 3 =-
$event.duration = 12
----------FIRED----------
---test end---
Actual: As expected rule fires for each new inserted event with desired
serviceName "MyService" (- behavior is clear).
*////Second rule:*
rule "ServicePerformanceEvent test rule2"
dialect "mvel"
when
accumulate(ServicePerformanceEvent(serviceName == "MyService",
$thisDuration : duration); $avg : average($thisDuration));
then
System.out.println("$events avg duration = " + $avg);
System.out.println("----------FIRED----------");
end
Invocation results of the test1_FireAllRules() and the test2_FireUntilHalt()
the same again:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
---test end---
Actual: Now rule accumulates average only for events from working memory
with desired serviceName (-this is clear) but fires only for inserted events
with expected serviceName "MyService" (- not clear)
*My expectation*: rule must fire for each currently inserted event and
average must be calculated for all events from working memory with
serviceName=="MyService".
*////Third rule:*
/rule "ServicePerformanceEvent test rule3"
dialect "mvel"
when
$event : ServicePerformanceEvent(serviceName == "MyService");
accumulate(ServicePerformanceEvent(serviceName ==
"MyService", $thisDuration : duration);
$avg : average($thisDuration));
then
System.out.println("$event.duration = " + $event.duration);
System.out.println("$events avg duration = " + $avg);
System.out.println("----------FIRED----------");
end/
Invocation results of the test1_FireAllRules():
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test1 end---
Actual: In case -=3=- rule fires for each event into working memory during
average calculation (- not clear)
*My expectation*: firing rule only for current/last inserted event and
calculation average for all events into working memory considering
sevriceName=="MyService".
Invocation results of the test2_FireUntilHalt():
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 2.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test2 end---
OR (with another sleep time)
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test2 end---
This results I can't explain and understand.
Could anyone help me to understand this pattern + accumulate behavior.
I spent a lot of time on my actual project task but with no result .
*The actual task is*:
Rule must fire for last inserted event if its serviceName equals to
"MyService" and
its duration greater than average duration of all events with same
serviceName from the working memory.
On the project we use fireUntilHalt strategy.
I really hope and appreciate any help. Thanks in advance.
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10:20 a.m.
Forgot to mention, I use drools version 5.0.4 Final.
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11:27 p.m.
As to the second test, what you observe is correct. All hell would
break loose in most KBs if rules *not* referring to a certain fact would
fire when such a fact is inserted! But you can easily achieve what
you want by adding the pattern
ServicePerformanceEvent()
in front of the accumulate CE.
The result of the third rule and test looks like a bug to me. There's
no version 5.0.4. Are you using 5.4.0? Can you try with a later
version?
-W
On 03/12/2013, ters <ters(a)ukr.net> wrote:
Hi all. Respected experts of drools, please help me to understand
how
pattern
+ accumulate behave.
I believe that an example is the best way to explain the problem, maybe it
will look bulky, but suppose be enough.
I use CEP and EventProcessingOption.Stream.
Event class:
/public class ServicePerformanceEvent {
private String serviceName;
private Integer duration;
public ServicePerformanceEvent(String name, Integer duration) {
serviceName = name;
this.duration = duration;
}
}/
There are 2 tests, 1st - with fireAllRules invocation, 2nd - with
firwUntilHalt invocation.
/ @Test
public void *test1_FireAllRules() *throws RuleGeneratorException {
System.out.println("-= 1 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 2));
ksession.fireAllRules();
System.out.println("-= 2 =-");
ksession.insert(new ServicePerformanceEvent("AnotherService", 10));
ksession.fireAllRules();
System.out.println("-= 3 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 12));
ksession.fireAllRules();
System.out.println("---test1 end---");
}
@Test
public void *test2_FireUntilHalt()* throws RuleGeneratorException,
InterruptedException {
System.out.println("-= 1 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 2));
runFireUntilHaltThread();
Thread.sleep(1000);
System.out.println("-= 2 =-");
ksession.insert(new ServicePerformanceEvent("AnotherService", 10));
Thread.sleep(1000);
System.out.println("-= 3 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 12));
Thread.sleep(1000);
System.out.println("---test2 end---");
}/
There are 3 simple rules for which I performing tests:
*////First Rule:*
declare com.test.event.ServicePerformanceEvent
@role( event )
end
rule "ServicePerformanceEvent test rule1"
dialect "mvel"
when
$event : ServicePerformanceEvent(serviceName == "MyService");
then
System.out.println("$event.duration = " + $event.duration);
System.out.println("----------FIRED----------");
end
Invocation results of the test1_FireAllRules() and test2_FireUntilHalt()
the
same:
-= 1 =-
$event.duration = 2
----------FIRED----------
-= 2 =-
-= 3 =-
$event.duration = 12
----------FIRED----------
---test end---
Actual: As expected rule fires for each new inserted event with desired
serviceName "MyService" (- behavior is clear).
*////Second rule:*
rule "ServicePerformanceEvent test rule2"
dialect "mvel"
when
accumulate(ServicePerformanceEvent(serviceName == "MyService",
$thisDuration : duration); $avg : average($thisDuration));
then
System.out.println("$events avg duration = " + $avg);
System.out.println("----------FIRED----------");
end
Invocation results of the test1_FireAllRules() and the
test2_FireUntilHalt()
the same again:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
---test end---
Actual: Now rule accumulates average only for events from working memory
with desired serviceName (-this is clear) but fires only for inserted
events
with expected serviceName "MyService" (- not clear)
*My expectation*: rule must fire for each currently inserted event and
average must be calculated for all events from working memory with
serviceName=="MyService".
*////Third rule:*
/rule "ServicePerformanceEvent test rule3"
dialect "mvel"
when
$event : ServicePerformanceEvent(serviceName == "MyService");
accumulate(ServicePerformanceEvent(serviceName ==
"MyService", $thisDuration : duration);
$avg : average($thisDuration));
then
System.out.println("$event.duration = " + $event.duration);
System.out.println("$events avg duration = " + $avg);
System.out.println("----------FIRED----------");
end/
Invocation results of the test1_FireAllRules():
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test1 end---
Actual: In case -=3=- rule fires for each event into working memory during
average calculation (- not clear)
*My expectation*: firing rule only for current/last inserted event and
calculation average for all events into working memory considering
sevriceName=="MyService".
Invocation results of the test2_FireUntilHalt():
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 2.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test2 end---
OR (with another sleep time)
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test2 end---
This results I can't explain and understand.
Could anyone help me to understand this pattern + accumulate behavior.
I spent a lot of time on my actual project task but with no result .
*The actual task is*:
Rule must fire for last inserted event if its serviceName equals to
"MyService" and
its duration greater than average duration of all events with same
serviceName from the working memory.
On the project we use fireUntilHalt strategy.
I really hope and appreciate any help. Thanks in advance.
--
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8:58 a.m.
laune, thanks for fast reply! So from point to point:
*-- "Are you using 5.4.0?"*
Yes, I'm using 5.4.0.Final.
*-- "But you can easily achieve what you want by adding the pattern
ServicePerformanceEvent() in front of the accumulate CE."*
I've tested this, LHS is:
/ ServicePerformanceEvent()
accumulate(ServicePerformanceEvent(serviceName == "MyService", $thisDuration
: duration);
$avg : average($thisDuration));/
The result is:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test end---
Now (e.g. in case -3-) rule fires on all already inserted/processed events!
but I expect (in case -3-) firing only for last inserting event which is not
processed before, that is:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$events avg duration = 2.0
----------FIRED----------
/-= 3 =-
$events avg duration = 7.0
----------FIRED----------/
---test end---
*--"Can you try with a later version?"*
I've just tried with 6.0.0.Final version. Now result of Third rule becomes
the same for both fireAllRules and fireUntilHalt tests (good point):
/////Third rule:
when
$event : ServicePerformanceEvent(serviceName == "MyService");
accumulate(ServicePerformanceEvent(serviceName == "MyService",
$thisDuration : duration); $avg : average($thisDuration));
then
System.out.println("$event.duration = " + $event.duration);
System.out.println("$events avg duration = " + $avg);
System.out.println("----------FIRED----------");
end /
Result:
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$event.duration = 2
$events avg duration = 7.0
----------FIRED----------
$event.duration = 12
$events avg duration = 7.0
----------FIRED----------
---test end---
As can see, in case -3-, rule fires 2 times - on already inserted and
processed as fact event with duration=2 and
on the event with duration=12 which inserted just now and was not processed
as fact before.
Actually what I want in this case - the rule should fire only on events
restricted with serviceName constraint, /*which are not
processed as fact/not-fact before (inserted between fireAllRules() calls)*/,
but average should be calculated for all existed in wm events considering
serviceName constraint.
I.e. my expectation for Third rule result is:
/ -= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
*-= 3 =-
$event.duration = 12
$events avg duration = 7.0*
----------FIRED----------
---test end---/
How I can achieve this behavior???
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9:58 a.m.
Hi ters,
I've run a few tests and I think that you'll have to use an entirely
different approach to achieve what you want.
accumulate creates a "virtual object" maintaining the accumulated
value(s). This is updated with every change to its domain, i.e., the
set of matching facts. Thus, for every inserted "MyService" the rule
will fire. (If you add some other pattern, then all matching products
result in an activation. So my advice for seeing the average for every
insert was wrong.)
You could write your own accumulate function (using the
init/action/result paradigm) where you accumulate over all
ServicePerformanceEvent events but count and sum only the "MyService"
events.
Alternatively, use a fact of a class that contains a count and a sum
and use this to collect the average:
public class Accu {
private String trigger;
private int sum;
private int count;
public Accu( String t ){
trigger = t;
}
public String getTrigger(){ return trigger; }
public int getAverage(){ return sum/count; }
public void accumulate( int value ){
sum += value;
count++;
}
}
rule a when
$event : Event( $source: source, $value: value)
$accu: Accu( trigger == $source )
then
$accu.accumulate( $value );
System.out.println("$events avg value = " + $accu.getAverage() );
end
rule b when
$event : Event( $source: source, $value: value)
$accu: Accu( trigger != $source )
then
System.out.println("$events avg value = " + $accu.getAverage() );
end
Cheers
-W
On 04/12/2013, ters <ters(a)ukr.net> wrote:
laune, thanks for fast reply! So from point to point:
*-- "Are you using 5.4.0?"*
Yes, I'm using 5.4.0.Final.
*-- "But you can easily achieve what you want by adding the pattern
ServicePerformanceEvent() in front of the accumulate CE."*
I've tested this, LHS is:
/ ServicePerformanceEvent()
accumulate(ServicePerformanceEvent(serviceName == "MyService",
$thisDuration
: duration);
$avg : average($thisDuration));/
The result is:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
$events avg duration = 7.0
----------FIRED----------
---test end---
Now (e.g. in case -3-) rule fires on all already inserted/processed events!
but I expect (in case -3-) firing only for last inserting event which is
not
processed before, that is:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$events avg duration = 2.0
----------FIRED----------
/-= 3 =-
$events avg duration = 7.0
----------FIRED----------/
---test end---
*--"Can you try with a later version?"*
I've just tried with 6.0.0.Final version. Now result of Third rule becomes
the same for both fireAllRules and fireUntilHalt tests (good point):
/////Third rule:
when
$event : ServicePerformanceEvent(serviceName == "MyService");
accumulate(ServicePerformanceEvent(serviceName == "MyService",
$thisDuration : duration); $avg : average($thisDuration));
then
System.out.println("$event.duration = " + $event.duration);
System.out.println("$events avg duration = " + $avg);
System.out.println("----------FIRED----------");
end /
Result:
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
$event.duration = 2
$events avg duration = 7.0
----------FIRED----------
$event.duration = 12
$events avg duration = 7.0
----------FIRED----------
---test end---
As can see, in case -3-, rule fires 2 times - on already inserted and
processed as fact event with duration=2 and
on the event with duration=12 which inserted just now and was not processed
as fact before.
Actually what I want in this case - the rule should fire only on events
restricted with serviceName constraint, /*which are not
processed as fact/not-fact before (inserted between fireAllRules()
calls)*/,
but average should be calculated for all existed in wm events considering
serviceName constraint.
I.e. my expectation for Third rule result is:
/ -= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
*-= 3 =-
$event.duration = 12
$events avg duration = 7.0*
----------FIRED----------
---test end---/
How I can achieve this behavior???
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11:21 a.m.
laune, thanks for explanations.
Could you please provide me with links/examples of how to /write your own
accumulate function (using the
init/action/result paradigm) /, and how to use this custom function instead
of standard one?
Regards!
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1:08 p.m.
On 04/12/2013, ters <ters(a)ukr.net> wrote:
laune, thanks for explanations.
Could you please provide me with links/examples of how to /write your own
accumulate function (using the
init/action/result paradigm) /, and how to use this custom function instead
of standard one?
rule manacc
when
Number( $avg: intValue )
from accumulate( Event( $source: source, $value: value),
init( int sum = 0; int count = 0; )
action( if( "server1".equals( $source ) ){
sum += $value; count++;
} )
result( count != 0 ? sum/count : 0 ) )
then
System.out.println("$events avg value = " + $avg );
end
You could add a
reverse( if( "server1".equals( $source ) ){
sum -= $value; count--;
})
Cheers
Wolfgang
Regards!
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5:24 a.m.
laune,
I've tried your proposed accumulate approach, the Result of
test1_FireAllRules() is:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
---test1 end---
Ok, it fires for each new inserted event (between fireAllRules calls) and
calculates avg for all events witn name "MyService".
But, as I wrote in first post, I need to fire a rule if last inserting event
duration
greater than value which depends on average duration of all events from the
wm. Lets take $avg/10(/10 - take for convenience to show issue).
So I need to add pattern along with accumulate:
/ Number( $avg: doubleValue ) from accumulate( ServicePerformanceEvent(
$name: serviceName, $thisDuration: duration),
init( double sum = 0; double count = 0; )
action( if("MyService".equals($name)){
sum += $thisDuration;
count++;})
result( count != 0 ? sum/count : 0 ) );
$event : ServicePerformanceEvent(serviceName == "MyService", duration >
*/$avg/10/*);/
Result of test1_FireAllRules():
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$event.duration = 12
$events avg duration = 7.0
----------FIRED----------
$event.duration = 2
$events avg duration = 7.0
----------FIRED----------
---test1 end---
As can see, it fires on both for newly inserted event and for old already
matched events/facts.
Ok, if rule analyzes all previous events/facts I decide to check previous
rule with test:
/ @Test
public void test12_FireAllRules() throws RuleGeneratorException {
System.out.println("-= 1 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 2));
ksession.fireAllRules();
System.out.println("-= 2 =-");
ksession.insert(new ServicePerformanceEvent("AnotherService", 10));
ksession.fireAllRules();
System.out.println("-= 3 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 12));
ksession.fireAllRules();
*/ System.out.println("-= 4 =-");
ksession.fireAllRules(); // call firing without inserting event after last
fire/*
System.out.println("---test1 end---");
}/
Result of test12_FireAllRules():
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$event.duration = 12
$events avg duration = 7.0
----------FIRED----------
$event.duration = 2
$events avg duration = 7.0
----------FIRED----------
/-= 4 =-
---test1 end---/
And what I see, in case -3- the rule analyzed both new and old facts...
but in case -4- the rule analyzed nothing! though, as in case -3-, there
were potentially matched old facts.
I completely don't understand such behavior...
Again, what I need for last test is:
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
/$event.duration = 12
$events avg duration = 7.0/
----------FIRED----------
-= 4 =-
---test1 end---
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6:08 a.m.
Try the following separation of the computation of the average from
the detection of critical events.
The first rule with a salience > 0 simply computes the average of all
Events and update a singular Fact (Average) containing a field with
the running average value.
A second rule matches on Average and the kind of Event you're
interested and tests the duration, e.g.
Average( $v: value )
Event( name == "MyService", duration > $v )
-W
On 05/12/2013, ters <ters(a)ukr.net> wrote:
laune,
I've tried your proposed accumulate approach, the Result of
test1_FireAllRules() is:
-= 1 =-
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$events avg duration = 7.0
----------FIRED----------
---test1 end---
Ok, it fires for each new inserted event (between fireAllRules calls) and
calculates avg for all events witn name "MyService".
But, as I wrote in first post, I need to fire a rule if last inserting
event
duration
greater than value which depends on average duration of all events from the
wm. Lets take $avg/10(/10 - take for convenience to show issue).
So I need to add pattern along with accumulate:
/ Number( $avg: doubleValue ) from accumulate( ServicePerformanceEvent(
$name: serviceName, $thisDuration: duration),
init( double sum = 0; double count = 0; )
action( if("MyService".equals($name)){
sum += $thisDuration;
count++;})
result( count != 0 ? sum/count : 0 ) );
$event : ServicePerformanceEvent(serviceName == "MyService", duration >
*/$avg/10/*);/
Result of test1_FireAllRules():
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$event.duration = 12
$events avg duration = 7.0
----------FIRED----------
$event.duration = 2
$events avg duration = 7.0
----------FIRED----------
---test1 end---
As can see, it fires on both for newly inserted event and for old already
matched events/facts.
Ok, if rule analyzes all previous events/facts I decide to check previous
rule with test:
/ @Test
public void test12_FireAllRules() throws RuleGeneratorException {
System.out.println("-= 1 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 2));
ksession.fireAllRules();
System.out.println("-= 2 =-");
ksession.insert(new ServicePerformanceEvent("AnotherService", 10));
ksession.fireAllRules();
System.out.println("-= 3 =-");
ksession.insert(new ServicePerformanceEvent("MyService", 12));
ksession.fireAllRules();
*/ System.out.println("-= 4 =-");
ksession.fireAllRules(); // call firing without inserting event after
last
fire/*
System.out.println("---test1 end---");
}/
Result of test12_FireAllRules():
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 3 =-
$event.duration = 12
$events avg duration = 7.0
----------FIRED----------
$event.duration = 2
$events avg duration = 7.0
----------FIRED----------
/-= 4 =-
---test1 end---/
And what I see, in case -3- the rule analyzed both new and old facts...
but in case -4- the rule analyzed nothing! though, as in case -3-, there
were potentially matched old facts.
I completely don't understand such behavior...
Again, what I need for last test is:
-= 1 =-
$event.duration = 2
$events avg duration = 2.0
----------FIRED----------
-= 2 =-
-= 3 =-
/$event.duration = 12
$events avg duration = 7.0/
----------FIRED----------
-= 4 =-
---test1 end---
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8:40 a.m.
Agree with you, I also have think about such approach. I will try it later
and inform here about the results.
laune, thank you again for your quick and adequate responses, I'm really
appreciate.
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12:19 p.m.
Wolfgang, hi again. I've tried your suggestion of the computation separation.
But I tried to use global variable instead of additional fact-accumulator:
/ @Test
public void test1_FireAllRules() throws RuleGeneratorException {
ksession.setGlobal("globalAccum", new ArrayList(Arrays.asList(0)));
ksession.insert(new ServicePerformanceEvent("MyService", 100));
ksession.fireAllRules();
}/
....................................................................
/global java.util.ArrayList *globalAccum*;
rule "HELPER rule to calculate value and put into global variable"
dialect "mvel"
*salience 10*
when
Number( $avg: doubleValue )
from accumulate( $e: ServicePerformanceEvent( $name: serviceName,
$thisDuration: duration),
init( double sum = 0; double count = 0;)
action( if("MyService".equals($name)){sum +=
$thisDuration; count++;})
result( count != 0 ? sum/count : 0 ) );
then
globalAccum.set(0, *$avg + 100*);
System.out.println("--------------------- HELPER RULE salience
10--------------------------------" );
System.out.println("RHS: HELPER RULE: globalAccum = " +
globalAccum.get(0));
end
rule "MAIN rule"
dialect "mvel"
when
$event : ServicePerformanceEvent(*duration >
globalAccum.get(0)*);
then
System.out.println("---------------------- MAIN
RULE--------------------------------" );
System.out.println("RHS: MAIN RULE: $event.duration = " +
$event.duration);
System.out.println("RHS: MAIN RULE: globalAccum = " +
globalAccum.get(0));
end/
The output of invocation was unexpected for me:
--------------------- HELPER RULE salience
10--------------------------------
RHS: HELPER RULE: globalAccum = *200.0*
---------------------- MAIN RULE--------------------------------
RHS: MAIN RULE: $event.duration = *100*
RHS: MAIN RULE: globalAccum = *200.0*
I've found that the order of invocation is:
1 - HELPER rule LHS (calculating avg)
2 - MAIN rule LHS (comparison duration(100) > globalAccum(0))!
3 - HELPER rule RHS (assigning globalAccum with value 200)!
4 - MAIN rule RHS
It was surprise for me, I've expected invocation of Main rule LHS after
Helper rule RHS.
So, as I understand, the only way to achieve desired behavior is insert
helper Fact (insert(new Average($avg)))
in the HELPER rule RHS and then matching this fact into MAIN rule LHS, use
avg from it and further retract it.
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12:01 a.m.
On 09/12/2013, ters <ters(a)ukr.net> wrote:
Wolfgang, hi again. I've tried your suggestion of the
computation
separation.
But I tried to use global variable instead of additional fact-accumulator:
The Rule Engine is very narrow-minded when it comes to evaluating
globals on the LHS of a rule. Changes aren't "seen" by the engine.
(Read the doc: "a global should never be used to establish conditions
in rules except when it has a constant immutable value.")
-W
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ters -
Wolfgang Laun