Question

我有Drools规则，在该规则中，我将java对象中的数值与规则中的数字进行比较，如果该规则为true，则java对象中的计数器将递增。最后，如果计数器超过特定数目，则应执行另一条规则。最后一条规则永远不会得到评估。

要检查计数器是否足够高，我在计数器递增后打印了计数器，这表明计数器变量应该足够高。

当计数器为0时，我将规则更改为评估为true时，其评估为true。

似乎采用了实例化的值。

我的Java对象看起来像这样（简化）：

public class CTDSIRSNotification {

    private double temperature;
    private double heartRate;
    private double respRate;
    private double paCo2;
    private double wbCellCount;
    private double immatureBand;

    private double counter;


    public CTDSIRSNotification(double temperature, double heartRate, double respRate, double paCo2, double wbCellCount, double immatureBand) {
        this.temperature = temperature;
        this.heartRate = heartRate;
        this.respRate = respRate;
        this.paCo2 = paCo2;
        this.wbCellCount = wbCellCount;
        this.immatureBand = immatureBand;
    }
//getters and setters
}

这些是我的规则：

rule "temperature"
    when
    $n1 : CTDSIRSNotification( temperature > 38 || temperature < 36 )
    then
    $n1.setCounter($n1.getCounter()+1);
    System.out.println($n1.getCounter()+", temperature");
end

rule "respRateAndPaCo2"
    when
    $n1 : CTDSIRSNotification( respRate > 20 || paCo2 < 32 )
    then
    $n1.setCounter($n1.getCounter()+1);
    System.out.println($n1.getCounter()+", respRateAndPaCo2");
end

rule "wbCellCountAndimmatureBand"
    when
    $n1 : CTDSIRSNotification( wbCellCount > 12000 || wbCellCount < 4000 || immatureBand > 10 )
    then 
    $n1.setCounter($n1.getCounter()+1);
    System.out.println($n1.getCounter()+", wbCellCountAndimmatureBand");
end 

rule "sirsNotification"
    when
    $n1 : CTDSIRSNotification( counter >= 3 )
    then 
    System.out.println($n1.getCounter()+", Alert for SIRS");
end

并且输出显示计数器正在递增：

1.0, temperature
2.0, respRateAndPaCo2
3.0, wbCellCountAndimmatureBand

当我更改最后一条规则以检查0：

rule "sirsNotification"
    when
    $n1 : CTDSIRSNotification( counter >= 0 )
    then 
    System.out.println($n1.getCounter()+", Alert for SIRS");
end

即使计数器实际打印为3，它的计算结果也为true：

1.0, temperature
2.0, respRateAndPaCo2
3.0, wbCellCountAndimmatureBand
3, Alert for SIRS

问题是我无法检查在规则执行运行期间更改的变量吗？

Answer 1

您需要从规则中调用update方法，该方法会使计数器增加。这使规则引擎意识到事实已被修改。因此，必须重新评估依赖于该事实的规则。

rule "temperature"
    when
    $n1 : CTDSIRSNotification( temperature > 38 || temperature < 36 )
    then
    $n1.setCounter($n1.getCounter()+1);
    System.out.println($n1.getCounter()+", temperature");
    update($n1);
end

rule "respRateAndPaCo2"
    when
    $n1 : CTDSIRSNotification( respRate > 20 || paCo2 < 32 )
    then
    $n1.setCounter($n1.getCounter()+1);
    System.out.println($n1.getCounter()+", respRateAndPaCo2");
    update($n1);
end

rule "wbCellCountAndimmatureBand"
    when
    $n1 : CTDSIRSNotification( wbCellCount > 12000 || wbCellCount < 4000 || immatureBand > 10 )
    then 
    $n1.setCounter($n1.getCounter()+1);
    System.out.println($n1.getCounter()+", wbCellCountAndimmatureBand");
    update($n1);
end 

rule "sirsNotification"
    when
    $n1 : CTDSIRSNotification( counter >= 3 )
    then 
    System.out.println($n1.getCounter()+", Alert for SIRS");
end

Drools规则未得到评估，以前的规则可以正常工作

1 个答案: