drools cep当前日期[副本]

Question

rule "Before rule test"
when
    $fall : Fall()
    $current : Date(this after[10m] $fall)
then
    System.out.println("Fall older than 10m at least");

rule "Before rule test"
when
    $fall : Fall(this before[10m] drools.currentDate)
then
    System.out.println("Fall older than 10m at least");

Answer 1

我们也有同样的问题，这里是我们的答案（不确定这是最好的方法）。

我们在云模式下工作，定期调用fireAllRules。

declare TickTocker
@propertyReactive
    Now : DateTime
end

rule "CreateTickTocker"
when
    not($tickTocker:TickTocker())
then
     TickTocker tickTocker = new TickTocker();
     tickTocker.setNow(new DateTime());
     insert(tickTocker);
end

rule "UpdateTickTocker"
timer (cron: 0/1 * * * * ? )
when
    $tickTocker:TickTocker()
then
    modify($tickTocker){
        setNow(new DateTime())
    }
end

用法：

rule "AlertOnLatency"
when
    $tickTocker:TickTocker()
    $monitored:MyObject(
        PeremptionDate < $tickTocker.Now)
then
    raiseAlert($monitored);
end