[rules-users] Fusion: Null pointer exception when using sliding windows

[Davide Sottara]

Wolfgang,
I was expecting you to do that :)

Btw, I don't know the requirements, but I wonder if some window
filter or temporal horizon (i.e. before[x,y]) shouldn't be applied to
the second pattern too... the use of a plain "before" requires to
keep all events in the WM since the beginning of time



On 04/19/2013 08:48 PM, Wolfgang Laun wrote:
> On 18/04/2013, burmanator <alexburman at gmail.com> wrote:
>> rule test
>> when
>> $primary : Foo($name : Name) over window:length(24)
>> $prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
>> $primary))
>> then
>> System.out.println("Found name: " + $name);
>> end
>>
> Apart from the sliding window and the manifest bug: I just wonder why
> nobody has pointed out that the rule can be rewritten as:
>
> rule test
> when
>     $primary : Foo($name : Name) over window:length(24)
>     not Foo(Name == $name, this before $primary)
> then
>    System.out.println("Found name: " + $name);
> end
>
> There is no other way the list size can be less than 1 :-)
> -W
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