How to fire pattern on partial match in Esper CEP

Question

I'm trying to solve route-violation problem. User defines a route as series of location sequences (in exact order) that some item needs to be seen on. So lets say that correct route is (this is defined by user)

A -> B -> C

I'm trying to write Esper EPL which will fire on all route violations. A is a starting point, which needs to start a pattern (a valid location).

A -> !B -> !C

This will fire when there are all 3 types of events found in ESPER.

But what I want is also to fire when there is only partial combination like

A -> !B

or

!B -> !C

or

B -> !C

because if route is missed on B then I'll probably never come to C and will not be notified of route violation.

Is this even possible with patterns in Esper?

Answer 1

我可以看到一些选项。

• 为每个
注册一个带有模式或匹配识别的单独语句
• 将每个人与＆＃34;或＆＃34;即＆＃34;每个（..）或每个（..）或每个（..）
• 将部分匹配的结果插入到另一个模式的流中以继续匹配
• 我认为匹配识别有一些恢复选项围绕＆＃34;跳过＆＃34;