java - 超能力规则语言: return datafield of class from pattern

Question

我有以下规则，当心率保持在 160 以上达 5 分钟时触发。

EPStatement cepStatementRule3 = cepRule.createEPL("context PartitionByMacHeartRate "
                + "select * from pattern[every(HeartRate(heartrate > 160) "
                + "-> (timer:interval(5 min) "
                + "and not HeartRate(heartrate<=160)))]");
        cepStatementRule3.addListener(new rule3Listener());

我的 HeartRate 类具有以下字段:

int heartrate;
String heartratesTimestamp;
String macAddress;

我想要的是能够在我的ruleListener 中获取macAddress。然而这返回一个空的 HashMap 。所以我的问题是如何返回 HeartRate 的 macAddress？

Answer 1

模式保留并返回标记的事件，即这样做:

// we assign the 'h' tag to the first event and the engine now retains that
// the select clause could use "h.macAddress as macAddress", for example
...every(h=HeartRate(...