java - Esper窗口使用: Recalculation based on event leaving window

Question

我需要这样的东西。

//Create a named window (w1)
Create window w1....

//then insert events into window
insert into w1....
select amount,.....
from....
where...

//remove from window
on RemoveEventArrived as r
Delete from w1
where w1.id = r.id

现在插入 w1 中名为 window 的另一个事件

//inserting into final output event
insert into derivedevent
select sum(w.amount)
from w1 as w

suppose event sequence:
1. Event with id=1 and amount= 100 arrived.
   o/p of sum(amount) triggered and gives 100.

2. Event withid = 2 and amount=200 arrived.
  o/p of sum(amount) triggered and gives 300.

3. **Remove** Event with id=1 arrived.
o/p of sum(amount) triggered and gives 200.

4. Event with id = 3 and amount=500 arrived
o/p of sum(amount) triggered and gives  700

但第三个事件无法自动触发派生事件重新计算。
当第四个事件到达时触发并根据需要给出输出。
有什么标准的方法吗？

我想计算新事件进入或离开窗口的金额总和。

Answer 1

3.事件(删除)确实会通过“插入派生事件”触发新总和的输出，除非没有删除任何内容，因此您的 id 键可能是错误的。如果仍然遇到问题，请将最小测试用例发送到 esper 用户邮件列表。或者使用 @Audit 查看引擎内部对每个语句执行的操作。