[rules-users] Help on writing a rule

[Wolfgang Laun]

Well...

On 22/10/2013, Demian Calcaprina <calcacuervo at gmail.com> wrote:
> Yes! I receive many price change events.. but, as I am using window length
> = 1, I would expect to have the activation cancelled for the previous one?
>
> I am not sure how to express this:
> "when there is some price change, and some signal, and there has not been
> any order over the last minute, then place an order"
>
> The price change and signal are like "existence" facts.. "If there is some
> price change change.." "if there is some signal ..."

there ist the "exists" CE,well documented in Expert's section 4.8.3.6.4.

But then you'll have trouble accessing the order id of this anonymous existence.

Again, I recommend using what I call an auxiliary "peephole fact" to
keep track of the latest pair of PriceChange and Signal, possibly with
a reference to the OrderCreated.

Also, the "magic"  if value 1234 doesn't look kosher to me, too.

-W

>
> Would this be another way to achieve what I am trying to do?
>
> Thanks,
>
> Demian
>
> PS: This is a simple rule, but then, the idea is to have more complex
> rules.. like, if there has been 10 signals in the last time, place an
> order, etc.
>
>
> On Tue, Oct 22, 2013 at 5:40 PM, Davide Sottara <dsotty at gmail.com> wrote:
>
>> Am I wrong or do you have two PriceChange events - 392 and 394 ?
>> If so, you can expect two activations.. when you fire al rules, one of
>> the two
>> will insert the OrderCreated, which in turn will cancel the other
>>
>> On 10/22/2013 01:34 PM, calcacuervo wrote:
>> > Hi Guys. I have one quesiton on how could I implement my rule.
>> > I have this rule:
>> > when
>> >               t : PriceChange() over window:length(1)
>> >               signal : Signal( id == "1234" ) over window:length(1)
>> >               not OrderCreated( id == "1234" ) over window:time (1m)
>> >       then
>> >                 insert(new OrderCreated("1234));
>> >
>> > Basically, when there is some signal and some price change, create a
>> > new
>> > order if  there has no been any other order in the last minute.
>> > But this sometimes is being fired twice:
>> > 12:31:01,121 INFO  [org.drools.audit.WorkingMemoryConsoleLogger] (Camel
>> > (camel-1) thread #4 - JmsConsumer[marketDataTopic]) ACTIVATION CREATED
>> > rule:ertetr activationId:ertetr [393, 392, 0] declarations:
>> > t=PriceChange
>> > [](392); signal=Signal at 1413ddef(393)
>> > 12:31:01,160 INFO  [org.drools.audit.WorkingMemoryConsoleLogger] (Camel
>> > (camel-1) thread #4 - JmsConsumer[marketDataTopic]) ACTIVATION CREATED
>> > rule:ertetr activationId:ertetr [393, 394, 0] declarations:
>> > t=PriceChange
>> > [](394); signal=Signal at 1413ddef(393)
>> >
>> > I think that, when the 1m window have passed, it creates twice the
>> > activations, as I have not called fire all rules yet. Does is make
>> sense? Do
>> > you have some idea on how could I implement this rule? "when there has
>> been
>> > some price change and some signal, and I did not create a new order in
>> the
>> > last minute, just create a new order".
>> >
>> > Thanks in advance!
>> >
>> > Demian
>> >
>> >
>> >
>> > --
>> > View this message in context:
>> http://drools.46999.n3.nabble.com/Help-on-writing-a-rule-tp4026461.html
>> > Sent from the Drools: User forum mailing list archive at Nabble.com.
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>> >
>>
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