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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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Can we extend Siddhi CEP java library with Siddhi High Available feature

I am using Sidhhi CEP as Java library in my project . Now i need to analyse my data with High available system (Similar to Esper HA). I have done little bit study about Siddhi High…
jeet shri
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How do I get one output stream for several statements in Esper?

I'm new to Esper and I'm trying to get the results of multiple EPStatements to run through the same UpdateListener. For instance: EPServiceProvider epService = EPServiceProviderManager.getDefaultProvider(); EPStatement avgStatement =…
user4645065
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ESPER - how to create a context

I'm using ESPER 5.1.0 in java to run analysis on log events (sender, message). I want to look for certain message patterns for each single sender. I intend to do this by defining a context. I managed to create the EPContextPartitionAdmin but I do…
higgzz
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Esper - pattern detection

I have a question for the community regarding pattern detection with Esper. Suppose you want to detect the following pattern among a collection of data : A B C However, it is possible, that in the actual data, you might have: A,B,D,E,C. My goal is…
benjamin steiner
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ESPER: 'Partition by' CLAUSE ERROR

The issue that I have is using the clause 'partition by' in 'Match Recognize', the 'partition by' clause seems to support just 99 different events because when I have 100 or more different events it does not group correctly. to test this I have the…
Roberto Fernandez
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Understanding Esper IO Http example

What is Trigger Event here ? How to plug this to the EsperEngine for getting events ? What URI should be passed ? how should engineURI look like ? Is it the remote location of the esper engine ? ConfigurationHTTPAdapter adapterConfig =…
Nagarjuna Pamu
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How do CEP rules engines store time data?

I'm thinking about designing an event processing system. The rules per se are not the problem. What bogs my is how to store event data so that I can efficiently answer questions/facts like: If number of events of type A in the last 10 minutes equals…
marianov
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WSO2 CEP failover and active-active mode

I use CEP in version 3.1.0, and I made two instances on two servers in HA failover mode. In documentation (https://docs.wso2.com/display/CLUSTER420/Clustering+Complex+Event+Processor) failover mode and active-active mode are set up the same. I have…
Kacu
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how to output the last 5 max values in Esper?

i have a question regarding Esper in java. Imagine that i have events with two elements for each event : money, name. What I want to do is to output 3 different names that have the most money. Is there any way of doing this ? example of…
benjamin steiner
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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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How to migrate from Apama 4 to Apama5.1?

I have CEP project built in Apama 4 and I am now migrating to Apama 5.1. But I am new to it and unable to figure out how to open even the old project. I went through the pdfs but not much help. Please someone guide me as to how to begin.
rohit k.
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ESPER - CEP trying to find the max(value) form events

Hello I'm desperate trying to find a way in ESPER - CEP to output the events that have the max value. Here's a good example to illustrate my problem: | value | category | date | | 12.2 | A | yyyy-MM-dd HH:mm:ss | | 13.3 |…
benjamin steiner
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Event sequencing

I'm new in Drools and CEP. I'm trying to solve issue by events processing - derive complex events from sequences of atomic events. For example, the sequence of A, B and C atomic events is D complex event. How can I solve this issue with Drools rule…
Ivan Kuzminov
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Siddhi Query for Geofence Entry Detection

I am trying to get Siddhi to fire events whenever it detects a flight has entered a Geofence, but can't quite figure out the correct query to do it. I have the following input stream definition: define stream GeofenceMulticasterConsumerStream (…
foyst
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Event table delete operation exception in wso2 cep 3.1.0

I am learning to use event table in the cep , but there was a mistake. from StreamInstance[action contains 'add']#window.length(1) select * insert into StreamInstanceTable; from StreamInstance[action contains 'delete'] delete StreamInstanceTable on…
laughing
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