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Questions tagged [complex-event-processing]

Complex event processing (CEP) consists of processing many events happening across all the layers of an organization, identifying the most meaningful events within the event cloud, analyzing their impact, and taking subsequent action in real time.

Complex event processing refers to process states, the changes of state exceeding a defined threshold of level, time, or value increment or just of a count as the event. It requires the respective event monitoring, event reporting, event recording and event filtering. An event may be observed as a change of state with any physical or logical or otherwise discriminated condition of and in a technical or economical system, each state information with an attached time stamp defining the order of occurrence and a topology mark defining the location of occurrence.

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detecting missing events in esper

I have a situation where I would like to detect when a source has not sent event into the systems for more than 24 hours. When this pattern is recognized, I would like to be able to retrieve the last know event (which may be days) the source did…
user2219560
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What is complex Event processing?

I have build an analytic app for a company that shows Key Performance Indicators(KPIs) based on selling/buying of items of their employees. Now what they want is to add event functionality like: * alert them if any employee sell more than $10,000…
Sachin Verma
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CEP with shared memory for fallback

I'm facing difficulties with finding the best CEP product for our problem. We need a distributed CEP solution with shared memory. The main reason for distribution isn't speeding up the process, but having a fallback in case of hardware or software…
Stefan Jansen
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Not able to start WSO2 CEP and external Apache Cassandra together on same host

I've installed WS02 CEP (v2.1.0) and Datastax Community provided Apache Casandra (latest version) locally on my machine (Windows OS). I'm finding issues in launching them together probably because of clash of Thrift client port (9160). If I edit the…
lbvirgo
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CEP --- is there a big difference between Oracle EPL and what is offered by ESPER?

I'm new to CEP and looking into playing with ESPER. I was doing some general googling on the topic and came a cross this: http://docs.oracle.com/cd/E13157_01/wlevs/docs30/pdf/epl_guide.pdf And also…
niken
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Error in Writing a Custom OutputAttributeProcessor

I have a question and problem about writing a custom OutputAttributeProcessor. I use WSO2 CEP 2.1.0 and siddhi 1.1.0. I want to create a custom OutputAttributeProcessor, so I create two java classes, DiscomfortIndexAggregatorFactory implements…
user2743651
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How are entitlements usually enforced when using a CEP engine?

I am creating a system where a CEP engine looks like a good fit (I need detect time based patterns between events in a number of streams). The events detected need to be displayed to end users in a WPF application but not all users are entitled to…
Daniel Johnson
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Multiple streams in CEP Engine (Esper)

I am new about esper engine and I am not sure about meaning of multiple streams. I want to create something like this: CepEnigine cep = new CepEngine(); Controller.getInstance().setRuntime(cep.getRuntime()); for(int i = 0; i < 5; i++) new…
Smitis
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splitting input event steam by date

I have an input stream, read from a database, with measurements from different devices. The events recorded in the database are not in chronological order but usually arrive in a 2 minute window. however some devices can send data with a timestamp…
Matt
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What 's the pack on the answer for "Writing a Custom Broker about WSO2 CEP"

I have same question for Writing a Custom Broker about WSO2 CEP on The Article of the link, Mr.mohanadarshan answerd https://stackoverflow.com/users/2168723/mohanadarshan But, I can not understand the link of the pack in the answer of the link…
user2759048
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Writing a Custom Broker about WSO2 CEP

I have a question about Custom Broker. I tried Custom Broker using an example from this blog article. I downloaded a sample template Custom Broker from "https://dl.dropbox.com/u/17922825/blog/cep-ext-broker.zip", I put cep-broker-1.0-SNAPSHOT.jar in…
user2743651
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Hierarchical rule triggering with Esper

We have a stream of events each having the following properties: public class Event { private String id; private String src; private String dst; } Besides, we have a set of hierarchical or nested rules we want to model with EPL and…
Nader Ghanbari
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JSON mapping in wso2 siddhi cep

This is to get some clarity on the JSON mapping of the generated JSON events in WSO2 CEP. I configured two buckets for this. I have a string (Suresh 7 LeadSE) and I'm converting that into a JSON object. First bucket is getting the input string and…
user2614092
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Esper publisher and subscriber at different hosts

Is there any sample code that can have one host publishing events and the other host receiving the event (listener or subscriber) through the Esper framework. I notice Esper provides different adaptors (socket, JMS and HTTP) but cannot find…
Gordon Ko
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Using Arrays in Esper CEP

Below is our Esper EPL statement: insert rstream into SelectedFieldsStream select rstream feedId as feedId , data.inputEvents.inputEventCount as inputCounts , data.inputEvents.inputEvent[1].name as inputName …
user2444292
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