3:03 p.m.
Hi,
I would like to write a rule for events timeout case.
Consider the events EventRecord(type=EventRequest, id=1) and
EventRecord(type=EventResponse, id=1).
I have written rules (in .drl file) for correlting the event request with
event response.
Now I would like to write timeout case. Suppose
EventRecord(type=EventRequest, id=2) is not followed by its response. If we
doesn't recieve response within 10 seconds, then it is considered as timeout
case.
I tried to use timers but it doen't work as it is not allowing me write
inside when (LHS) pattern.
Is there any other way to find timeout cases?
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4:48 p.m.
First question: are you using Drools Fusion?
If yes, did you try with something like this?:
EventRecord(type=EventRequest, id=1)
not EventRecord(type=EventResponse, id=1, this after [1s,10s]).
I'm using a 10s timeout here.
Best Regards,
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com
On Fri, Apr 13, 2012 at 3:03 PM, skatta1986 <shivaprasad_gdk(a)yahoo.co.in>wrote:
Hi,
I would like to write a rule for events timeout case.
Consider the events EventRecord(type=EventRequest, id=1) and
EventRecord(type=EventResponse, id=1).
I have written rules (in .drl file) for correlting the event request with
event response.
Now I would like to write timeout case. Suppose
EventRecord(type=EventRequest, id=2) is not followed by its response. If we
doesn't recieve response within 10 seconds, then it is considered as
timeout
case.
I tried to use timers but it doen't work as it is not allowing me write
inside when (LHS) pattern.
Is there any other way to find timeout cases?
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12:36 p.m.
Hi,
For the first time even I have tried the same. But it doesn't work.
I need to correlate the events on live. I am using fire rule until hault
(ksession.fireUntilHalt()).
EventRecord(type=EventRequest, id=1)
not EventRecord(type=EventResponse, id=1, this after [1s,10s])
This rule doesn't work because when EventRecord(type=EventRequest, id=1) hit
working memory, this rule also looks for EventRecord(type=EventResponse,
id=1). As the EventResponse doesn't the working memory, "not" logic become
true and executing the R.H.S part as soon as EventRequest arrives. This is
not waiting for 10seconds time interval.
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12:43 p.m.
You might use a timer:
rule no_response
timer( int: 10s )
when
EventRecord( type=EventRequest, id=1 )
not EventRecord( type=EventResponse, id=1 )
then
// ... no matching response after 10s
end
-W
On 16/04/2012, skatta1986 <shivaprasad_gdk(a)yahoo.co.in> wrote:
Hi,
For the first time even I have tried the same. But it doesn't work.
I need to correlate the events on live. I am using fire rule until hault
(ksession.fireUntilHalt()).
EventRecord(type=EventRequest, id=1)
not EventRecord(type=EventResponse, id=1, this after [1s,10s])
This rule doesn't work because when EventRecord(type=EventRequest, id=1) hit
working memory, this rule also looks for EventRecord(type=EventResponse,
id=1). As the EventResponse doesn't the working memory, "not" logic become
true and executing the R.H.S part as soon as EventRequest arrives. This is
not waiting for 10seconds time interval.
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3:24 p.m.
Hi, Thanks for the response..
This is working fine.. But I have a query on the rule:
rule no_response
timer( int: 10s )
when
EventRecord( type=EventRequest, id=1 )
not EventRecord( type=EventResponse, id=1 )
In general timer means executing a thread for every specified time period
interval. But in our case, one time would be enough for an event. In the
above rule my query is - after timeout case (i.e., firstime 10 seconds from
the EventRequest), timer thread will be closed or will it be still running?
Second Query is:
Consider the below Success rule:
rule event_success_case
when
EventRecord( type=EventRequest, id=1 )
and EventRecord( type=EventResponse, id=1 )
With "no_response" rule, for every EventRequest there is a timer thread
running for every 10Sec. Second rule "event_success_case" looks for its
EventResponse. Suppose with in 10 seconds there is a response then
"event_success_case" rule is run. Now I would like to close the timer thread
because it uses my system memory. Please let me know if this is possible.
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4:52 p.m.
See inline.
On 16/04/2012, skatta1986 <shivaprasad_gdk(a)yahoo.co.in> wrote:
Hi, Thanks for the response..
In general timer means executing a thread for every specified time period
interval.
Why would you think so? java.util.Timer runs one thread, and
TimerTasks are executed by it, one after the other.
But in our case, one time would be enough for an event. In the
above rule my query is - after timeout case (i.e., firstime 10 seconds from
the EventRequest), timer thread will be closed or will it be still running?
There's no point in disposing a Timer thread and to recreate it for
another activity. A dormant thread doesn't burden the system.
Second Query is:
Consider the below Success rule:
rule event_success_case
when
EventRecord( type=EventRequest, id=1 )
and EventRecord( type=EventResponse, id=1 )
With "no_response" rule, for every EventRequest there is a timer thread
running for every 10Sec. Second rule "event_success_case" looks for its
EventResponse. Suppose with in 10 seconds there is a response then
"event_success_case" rule is run. Now I would like to close the timer thread
because it uses my system memory. Please let me know if this is possible.
Trust Drools, trust Java. If the condition isn't true, everything will
be taken care of. (Threads don't use that much memory.)
-W
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9:04 a.m.
Hi,
Now time out is working fine.
But facing issues for correlating success and failure events which doesnot
have unique id. I want to correlate an event request followed by its
immediate event response.
Ex: Consider the events in below order
EventRecord( type=EventRequest, user="katta" )
EventRecord( type=EventResponseFailure, user="katta" )
EventRecord( type=EventRequest, user="katta" )
EventRecord( type=EventResponseSuccess, user="katta" )
Rules:
rule event_success_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and EventRecord( type=EventResponseSuccess, user="katta", this after[0s,
10s] $req )
then
System.out.println("Success case for user " + $req.getUser());
retract($req);
end
rule event_failure_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and EventRecord( type=EventResponseFailure, user="katta", this after[0s,
10s] $req )
then
System.out.println("Failed case for user " + $req.getUser());
retract($req);
end
In the above example I don't have any unique identity to correlate request
and response. I need to correlate only based on events order.
In the above example events order is EventRequest --> EventResponseFailure
and then EventRequest --> EventResponseSuccess. So my expected output is:
Failed case for user katta
Success case for user katta
But I am getting below response:
Success case for user katta
Success case for user katta
First EventRequest and second EventRequest are correlating with second
response EventResponseSuccess as this response is within 0 to 10sec for both
events.
Note: I am getting expected result only when I send few events. If I insert
around 50 events at time into Working Memory, I face this kind of unexpected
result.
I need to work on live trafic, where I receive hurends of messages per
second.
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12:12 p.m.
"Immediate response" is one way of saying that there is no other
response between a request and a response for one user. Simply add
this condition, testing for both kinds of response.
-W
On 19/04/2012, skatta1986 <shivaprasad_gdk(a)yahoo.co.in> wrote:
Hi,
Now time out is working fine.
But facing issues for correlating success and failure events which doesnot
have unique id. I want to correlate an event request followed by its
immediate event response.
Ex: Consider the events in below order
EventRecord( type=EventRequest, user="katta" )
EventRecord( type=EventResponseFailure, user="katta" )
EventRecord( type=EventRequest, user="katta" )
EventRecord( type=EventResponseSuccess, user="katta" )
Rules:
rule event_success_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and EventRecord( type=EventResponseSuccess, user="katta", this after[0s,
10s] $req )
then
System.out.println("Success case for user " + $req.getUser());
retract($req);
end
rule event_failure_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and EventRecord( type=EventResponseFailure, user="katta", this after[0s,
10s] $req )
then
System.out.println("Failed case for user " + $req.getUser());
retract($req);
end
In the above example I don't have any unique identity to correlate request
and response. I need to correlate only based on events order.
In the above example events order is EventRequest --> EventResponseFailure
and then EventRequest --> EventResponseSuccess. So my expected output is:
Failed case for user katta
Success case for user katta
But I am getting below response:
Success case for user katta
Success case for user katta
First EventRequest and second EventRequest are correlating with second
response EventResponseSuccess as this response is within 0 to 10sec for both
events.
Note: I am getting expected result only when I send few events. If I insert
around 50 events at time into Working Memory, I face this kind of unexpected
result.
I need to work on live trafic, where I receive hurends of messages per
second.
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7:54 p.m.
Could you please help out me in this...
modified rules: But it is giving thread exception at runtime
rule event_success_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and $resp : EventRecord( type=EventResponseSuccess, user="katta", this
after[0s, 10s] $req )
and ( not (EventRecord( type=EventResponseSuccess, user="katta", this
after[0s, 10s] $req , this before[0s, 10s] $resp)))
#and ( not (EventRecord( type=EventResponseSuccess, user="katta", $req
overlaps this, this overlaps $resp) ))
then
System.out.println("Success case for user " + $req.getUser());
retract($req);
end
rule event_failure_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and EventRecord( type=EventResponseFailure, user="katta", this
after[0s, 10s] $req )
and ( not (EventRecord( type=EventResponseFailure, user="katta", this
after[0s, 10s] $req , this before[0s, 10s] $resp)))
#and ( not (EventRecord( type=EventResponseFailure, user="katta", $req
overlaps this, this overlaps $resp) ))
then
System.out.println("Failed case for user " + $req.getUser());
retract($req);
end
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8:26 p.m.
without the error trace, hard to say why it crashes ...
But your rules can be simplified/clarified :
- "and" to connect conditions is not needed
- in your first 'not' condition, which you add to test that no other event
takes place between the two objects matched in previous patterns, you should test the two
response types, as you don't want *any* response ...
- again in your first 'not' condition, the after/before should not be in a
interval. Why not using after/before only ? For timeout ? Should be a third rule to me ...
and should add a rule to handle response coming after the timeout too.
- I cant see the utility of you second 'not' pattern (may be because of my
previous remarks)
Another question : why don't you retract the response too ? Is it because you want to
keep them ?
To me it is better to retract it, especially if it takes place between another initial
EventRequest and its response. at least mark the response as treated and ignore the
treated responses in your conditions
So, your rules will become 2 groups of rules : first group to handle the response that
correspond to a request, second group to handle the timeout cases :
rule event_success_case
when
$req : EventRecord( type=EventRequest, $user : user )
$resp : EventRecord( type=EventResponseSuccess, user=$user, this after $req )
not (EventRecord( type=EventResponseSuccess || EventResponseFailure, user=$user,
this != $resp, this after $req , this before $resp)))
# 'this != $resp' is not mandatory as you test after/before (which are
strict), but it does not harm ...
then
System.out.println("Success case for user " + $req.getUser());
retract($req);
retract($resp);
end
rule event_failure_case : same but testing the other status
rule event_timeout_case
when
$req : EventRecord( type=EventRequest, $user : user )
not (EventRecord( type=EventResponseSuccess || EventResponseFailure, user=$user,
this after[0,10s] $req))) // assuming 10s for timeout
then
System.out.println("Timeout case for user " + $req.getUser());
retract($req);
end
rule event_response_after_timeout_case
when
$resp: EventRecord( type=EventResponseSuccess || EventResponseFailure, $user : user )
not (EventRecord( type=EventRequest, user=$user,
this before $resp)))
then
System.out.println("Response coming after timeout case for user " +
$req.getUser());
retract($resp);
end
8:53 p.m.
With this kind of scenario it helps a lot if you retract a matching
pair (R+S, R+F). (If you need the information for further processing,
create another fact.)
And make sure to use '==' when testing for equality!
rule request_success
when
$req : EventRecord( type == EventRequest, $user: user)
$resp : EventRecord( type == EventResponseSuccess, user==$user,
this after[0s.10s] $req )
not EventRecord( type == EventResponseSuccess || == EventResponseFailure,
user == $user, this before $resp )
then
// success
retract( $req );
retract( $resp );
end
-W
On 19/04/2012, skatta1986 <shivaprasad_gdk(a)yahoo.co.in> wrote:
Could you please help out me in this...
modified rules: But it is giving thread exception at runtime
rule event_success_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and $resp : EventRecord( type=EventResponseSuccess, user="katta", this
after[0s, 10s] $req )
and ( not (EventRecord( type=EventResponseSuccess, user="katta", this
after[0s, 10s] $req , this before[0s, 10s] $resp)))
#and ( not (EventRecord( type=EventResponseSuccess, user="katta", $req
overlaps this, this overlaps $resp) ))
then
System.out.println("Success case for user " + $req.getUser());
retract($req);
end
rule event_failure_case
when
$req : EventRecord( type=EventRequest, user="katta" )
and EventRecord( type=EventResponseFailure, user="katta", this
after[0s, 10s] $req )
and ( not (EventRecord( type=EventResponseFailure, user="katta", this
after[0s, 10s] $req , this before[0s, 10s] $resp)))
#and ( not (EventRecord( type=EventResponseFailure, user="katta", $req
overlaps this, this overlaps $resp) ))
then
System.out.println("Failed case for user " + $req.getUser());
retract($req);
end
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4:08 p.m.
thanks for the reply its giving expected results
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5:25 p.m.
and thanks for providing feedback !
----- Mail original -----
De: "skatta1986" <shivaprasad_gdk(a)yahoo.co.in>
À: rules-users(a)lists.jboss.org
Envoyé: Mardi 24 Avril 2012 16:08:02
Objet: Re: [rules-users] please provide a rule for events timeout cases
thanks for the reply its giving expected results
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participants (4)
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Esteban Aliverti -
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Vincent LEGENDRE -
Wolfgang Laun