NEsper is a CLR-based component for building CEP and ESP engines.
NEsper is a CLR-based component for building CEP and ESP engines. NEsper is based upon the Esper baseline, but includes customizations that are specific to the .NET CLR.
Questions tagged [nesper]
63 questions
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dissect a string (removing portions) with Esper syntax
I'm using an esper statement to compare to variables and trigger when variable1 != variable2.
My issue is that variable1 contains additional information I don't care about. I just want to match the first portion
Example Data:
Variable1 =…
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1 answer
How and where to add Named Window using EPL in NEsper?
I already have the createstatement function and have successfully detected a simple event. My problem now is to process a complex event using EPL.
I need to process both simple and complex events in the same process. I thought I could use…
Ruby
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NEsper memory usage of "output" keyword
I have many EPL statements that output a period of time (1~24 hours), and following is my statement
"SELECT MessageID, VName, count(VName) as count FROM DDIEvent(MajorType=4).std:groupwin(VName).win:time(3 hour).win:length(10) group by VName having…
Rex Feng
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Is it possible to differentiate in a window among the removed items, when an item is updated or if it expired?
I'm novice in NESPER, and I have an application that works with a StateEvent (id string, ts long, State int). The application is based on the values supplied by ts(Timestamp) of the StateEvent.
The values of the state property of StateEvent can be…
Lurdes Hernandez
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How elaborate more an intermediate event via a C# function invocation?
I'm novice in NESPER, and in some point of my application (stm-A), I need to use a function in C# that transform the original event in (possible) several different events (the original one enriched, and possibly additional events)
I think that a…
Lurdes Hernandez
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nesper: how to see audit information
When you use the @Audit annotation in a sentence how / where can I find the @audit information in nesper?
I have configured
Configuration config = new Configuration();
config.EngineDefaults.ExecutionConfig.IsPrioritized = true;
…
Lurdes Hernandez
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Nesper - LoaderExceptions
I am building a Nesper application and after deployment it throws this error:
System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
at…
littlecodefarmer758
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Transform SQL JOIN SELECT to Esper EPL syntax
Let's consider a simple object with the same representation in a SQL database with properties(columns¨): Id, UserId,Ip.
I would like to prepare a query that would generate event in case that one user logs in from 2 IP adresses (or more) within 1…
Vojtech B
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EPL Esper query use historical time stored in event's property instead of publish time
Let's say that I have a simple object:
public class StockTick{
private String symbol;
private decimal price;
private Date date;
private int unixTimestamp
}
How should I modify following query to use StockTick.date or…
Vojtech B
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Grouping and batching events in Esper
I am trying to group events by User and return them in batches (per user). For example, if 3 users each sent 5 events, I would like 3 batches of 5 events to be output from esper.
Using the following EPL, I am able to validate that 3 data windows…
beterthanlife
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Time mesauring of unique objects with Nesper
I would like to measure the time of cars with an unique Id with NEsper. My problem is, that there are several cars on a road. This road has predefined steps. I want to start to stop the time for every unique car that is in first step until this car…
HassanJackson
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2 answers
Forcing output from an esper stream on expression
I've got an esper query for pulling market data. It looks like
select * from L1Quote(Symbol='MSFT')
This will fire when ever a new quote occurs. I require a first quote/event to do some initial setup. This is no problem for symbols where…
chollida
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3 answers
Nesper engine always tries to load types from Nesper.dll first
Every time I try to add a new type to my nesper engine, I get the following exception thrown in the nesper engine.
Could not load type 'K2Common.Order' from assembly 'NEsper, Version=4.8.0.0, Culture=neutral, PublicKeyToken=null'.
The engine eats…
chollida
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Nesper - difference between MarketDepth.std.unique(key).win:time_batch(500 msec) vs MarketDepth.win:time_batch(500 msec).std:unique(key)
What is the difference between doing the following statements in Nesper
MarketDepth.std.unique(key).win:time_batch(500 msec) vs MarketDepth.win:time_batch(500 msec).std:unique(key)
Does the first one batch all events with the unique key and dispatch…
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Nesper adding event types to my winforms app.config
I'm interested in defining multiple event-types my app.config file but it doesn't appear to get loaded by default. Is there something that I'm doing wrong? The event type doesn't exist within com.espertech.esper.client.Configuration.
…