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
3
votes
1 answer
esper in custom rule engine
I need to implement a rule engine using ESPER
For this I have to prepare query for rules (if there is any other optimized way, please suggest). Rules must be declarable as well as modifiable at run time.Also I will have to create a UI to define…
Chaturvedi Dewashish
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3
votes
1 answer
Starting with Esper + sockets
I'm a rookie with Esper and I would like to get some help. I've already managed to use Esper with CSV files, but now I need to use Java objects as events sent through a socket and I can't find simple examples on the Internet to use as a guide.
Has…
user1712242
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3
votes
1 answer
Esper and SQS
I'm wondering if anyone here has tried using Esper to process stuff from the Cloud? Specifically Amazon's Simple Queueing Service. I've googled about this, and we know it's feasible, but it would be nice to know if anyone has tried it. Even better…
MrTelly
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2
votes
2 answers
sample code about esper engine
i wanted to begin learning ESPER engine, and i found out that ester native examples are a little complex.
is there any one who has a good simple example java code, which is about using esper?
saman
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2
votes
1 answer
Count and Time window in Esper EPL
I have the following use case, which I'm trying to write in EPL, without success. I'm generating analytics events of different types, generated in different intervals (1min, 5min, 10min, ...). In special kind of analytics, I need to collect 4…
feci
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2
votes
1 answer
Creating instances of Esper's epl
I am playing around with Esper, learning how to use more advanced concepts.
I have a program that fires mock stock events of 3 different stocks. I currently have a module with match_recognize pattern EPL that looks like this:
module…
jocund
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2
votes
2 answers
Which Open source CEP shoud I choose for distributed and pipelined processing ; siddhi, Flink , Esper?
I am little bised towards siddhi cep as it has siddhi query language but it uses storm for distributed processing and WSO2 provides an web interface / dashboard to create and deploy applications . I think it will give me less independence to enhance…
Amarjit Dhillon
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votes
0 answers
Esper Java EPL Pattern
I want to process the following JSON Objects :
[
{
id: "38485ndndndn4848",
value : 120, // kw
ts: 1456983266,
sensor_id: 20
},
{
id: "48485ndndndn4848",
value : 189, //kw
ts: 1456984286,
…
user4958578943093890
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2
votes
1 answer
Esper EPL Query for Time(t) and Time(t-1)
I am trying to implement an EPL query that can pick up the avg for Time(t) & Time(t-1).
For example:
a) in the first 5 seconds (seconds 0-5) there are 2 events with an avg of 12
b) in the next 5 seconds (seconds 5-10) there are 3 events with an…
Gene Bo
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2
votes
1 answer
How to get the convert a Jython class to Java class in Jython intepreter?
I am trying to register a User Defined Function with Esper API. It take a class or string type arguement
http://esper.codehaus.org/esper-4.0.0/doc/api/com/espertech/esper/client/ConfigurationOperations.html#addImport(java.lang.String)
class…
zmx
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2
votes
1 answer
WSO2 CEP On-demand query and continuous queries
I am currently using Esper CEP and wondering whether I can replace it with the WSO2 CEP. Trying do to a feature comparison of the two. The very first question based on my use case is -
Does WSO2 CEP support on-demand queries and continuous queries…
ASG17
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2
votes
2 answers
wso2/ws02 CEP, ESPER or something else?
I have a use case where a system transaction happen/completed over a period of time and with multiple "building up" steps. each step in the process generates one or more events (up to 22 events per transaction). All events within a transaction have…
Sbham
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2
votes
2 answers
Esper Callback on Error
I am currently using Esper within a Storm topology and I am aware that there is a method callback called update() that is called when Esper produces a result.
I have been wondering what would happen if there is an error within the Esper engine…
mchinaloy
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2
votes
1 answer
Storm Cluster Duplicate Tuples
Currently I am working on a project where I have setup a Storm cluster across four Unix hosts.
The topology itself is as follows:
JMS Spout listens to an MQ for new messages
JMS Spout parses and then emits the result to an Esper Bolt
The Esper…
mchinaloy
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2
votes
1 answer
run AlgoTrader Simulation in Eclipse
I am trying to run the SimulationStarted class with the moving average strategy in the open source edition of AlgoTrader.
When I start the SimulationStarter in eclipse I get
Exception in thread "main"…
Nema Tikaja
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