Esper is a lightweight, open-source library for CEP (Complex Event Processing) and ESP (Event Stream Processing) applications developed by EsperTech Inc.
It is available for Java as Esper, and for .NET as NEsper under the GPL V2 license.
Questions tagged [esper]
536 questions
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1 answer
NEsper Example explanation - StockTicker
I'm trying to understand the NEsper and it's examples. It seems like that the example - StockTicker is beginner level. Still I have difficulties to understand and implement this example. Can anyone tell me how to implement and test this example step…
Narsu
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1 answer
Is necessary to use a RMI Server in Esper 8 in order to Runtime deploy Esper Workflows
I'm trying to make an Esper application thats permits me to Runtime deploy dataflow based patterns. In order to implement this, I used a RMI based server for sending patterns, but thinking on that, it may be not necessary. There is a way embedded in…
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1 answer
Esper - Aggregations of sub-timewindows
I have a stream of market data events with (Price, Trade Time) properties.
I want to calculate the simple average for past time windows for every new market data event. Simple average = Sum of trade prices / # of events
However, the tricky part is…
yuu
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votes
1 answer
Esper: Select a specified attribute of all objects in a List
im totally new to Esper, so please don't shoot me, if the following question sounds stupid.
I am sending POJO-events to an esper instance. This POJOS have some attributes, as follows:
MyEventPOJO {
final String sourceIP;
final String destIP;
final…
Kai
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1 answer
Install Esper in Eclipse
I'm struggling to install Esper in Eclipse. I'm not good at technical issues, so please I need all details to do so.
In fact, I added all jar files of esper-5.4.0.zip in Java build path of my project. I have got the following error…
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1 answer
Sometimes do not work when use Esper inner join
EPL is like this:
select
cast(a.ReportTime,date,dateformat:'yyyy-MM-dd') as ReportTime,
a.Source,
aa.RequestNum,
a.ServerTotal,
a.ServerSucc,
b.Total,
b.Succ,
NULL as DataChange_LastTime,
c.Response
…
zyxing
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votes
1 answer
Pass parameter to ESPER EPL query?
I am new to esper epl query.I want to know is it possible to change EPL query in run time.It means I have a form which can use to change the time length,number of records in ESPER.It is simply like this,increase the time length in epl query,number…
Sajith Vijesekara
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1 answer
Check Data with Esper + Twitter4J
I am using Esper with Twitter4J to process Data from the Twitterstream. Now I want to compare current Data with all Data from the last 10 seconds. I want to check, if someone posts two or more Tweets in a time slice of 10 seconds. Whats Statement…
user3983913
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votes
1 answer
Allowing switching on/off of events in EPL
Just a general question with regards to Esper.
Does anyone know if it is possible to turn on/off EPL statements in an EPL file without having to comment the actual EPL statement.
Can it be done using XML config file?
If so, could you provide links…
Dave
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1 answer
Esper context usage for permission handling
I want to set up viewing permissions for different users in EPL query as follows:
Users AllowedView
U1 V1,V2
U2 V1,V3
U3 V2,V3
Input Events sequence are as:
User View Amount
1. U1, V1, 20
2. U2, V3, 30
3. U3, V3, 40
4. U3, V2,…
Chaturvedi Dewashish
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votes
1 answer
How to keep going to get average when restarting the Esper program?
Does Esper support exception handling for restarts?
I want this exception handling
I'm sorry. My English is not good.
so I added picture.
Jinhee Lee
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