Esper窗口的使用：基于事件离开窗口的重新计算

Question

我需要这样。

//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 

现在插入到另一个事件从W1命名的窗口

//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 

，但有些事件3不能自动触发derivedevent recalculatin。
第4个事件到达时触发并根据需要输出。
任何标准的做法？

我想计算一个新事件是否进入窗口或离开它的总量。

Answer 1

3.事件（remove）通过“insert into derivedevent”触发输出一个新和，除非没有被删除，因此也许你的id键是错误的。 如果仍然遇到问题，可以向esper用户邮件列表发送一个最小的测试用例。 或使用@Audit来查看引擎在内部对每条语句执行的操作。