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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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Apache Storm aggregation rules for missing expected events in rolling time-period

My use-case is to identify entities from which expected events have not been received after X amount of time in real-time rather than using batch jobs. For Example: If we have received PaymentInitiated event at time T but didn't receive either of…
Harish
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Referring to named global expressions inside an event filter using EPStatementObjectModel (Esper)

I am aware that you can create global expressions with Esper's Statement Object Model using CreateExpressionClause and ExpressionDeclaration, but I'm not exactly sure how you are able to refer to their aliases when building an EPStatementObjectModel…
Brady Goldman
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Esper - remove old events from runtime

I have a question concerning the CEP-Engine Esper: How can I remove old events from a runtime to free memory? Thank you. Edit: Sorry, I meant the EPRuntime, not the JVM runtime
Sebius75
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wso2 CEP 4.0.0-SNAPSHOT and cassandra. Does it work?

I downloaded wso2 cep 4.0.0-SNAPSHOT from jenkins around 2 weeks ago. When I configure the cassandra output publisher from cep I tie it to an event stream. When I test the event stream, the cassandra output publisher is invoked and I have an…
Luca Stancapiano
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Registering triggers for missing expected events using Esper in real-time

My use-case is to identify entities from which expected events have not been received after X amount of time in real-time rather than using batch jobs. For Example: If we have received PaymentInitiated event at time T but didn't receive either of …
Harish
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How to build fault-tolerant aggregations in Esper CEP

As per Esper (CEP) docs it is standalone which doesn't connect to any DB or external systems and does all aggregations by keeping minimal past data in memory. So if I am having an aggregate for last 1 hour window and if the Esper container node dies…
Harish
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Deploying CEP through WARs on CentOS VM - Proton Server issue

I've deployed the 4 war files for Fiware Proton CEP, I got a month ago on githug (I believe), on a CentOS 6 VM, after installing Java SE 8 and Tomcat 7. These WAR files where inside a zip file, but now I can't find it on github anymore. Beyond that,…
A. Vieira
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WSO2 CEP fire BPS over SOAP failed

I want to invoke a BPS process from CEP through SOAP method, but got an exception in BPS side. the event output formatter such as:
mxx
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How to include multiple statements in Apache Camel - Esper endpoint?

I have a list of Esper statements which I would like to run within the Apache Camel flow. How can I make sure all statements are evaluated for all messages? Do I need to have a separate route for each Esper statement (i.e. from: esper://…
Rado
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WSO2 BAM 2.5 - Default Logger Output Event Adaptor

Which directory and file does the default logger output event adaptor write the logs to? I am not able to see the logs in the repository/logs/wso2carbon.log file? The log4j properties file in repository/conf has the default configurations and I can…
dave
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Drools Fusion time sliding based windows

I cannot undestand how JBoss Drools inference engine works with complex event processing (drools fusion). Actually i created a rule in order to deny a transaction if more than 2 transactions occour in less than 5 seconds. Here is the rule rule "more…
Claudio Campisi
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WSO2 BAM 2.5 - Output Event Adaptor

Two questions on WSO2 BAM 2.5 Output Event Adaptor - 1) Why is there no "email" option in the output event adaptor type? As per the documentation, it should be there. Even if I create my own XML file for the Email event adaptor and drop it in the…
dave
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Esper - detect absence of a certain event

is it possible to detect the absence of a certain event type within a given time window without using any other event types in Esper? Thanx ;)
user2352052
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CEP Producer - Timed file adapter

In Fiware CEP's User Manual (pdf), page 12, it's mentioned you can create an event Producer of the type 'Timed', that will retrieve events from a file at intervals of time based on their 'OccurranceTime' property. In my Fi-Lab's intance I don't…
A. Vieira
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Multiple count in single statement (esper epl)

I am trying to create an epl statement using esper for monitoring response times, something like this: SELECT QUEUENAME, count(latency>1000) AS NUMBER_OF_SLA_BREACHES, COUNT(latency) AS TOTALS FROM ResponseWindow GROUP BY QUEUENAME .. however the…
user955732
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