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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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WSO2 Developer Studio - CEP Bucket

Is there any way to give some syntax or context help for writing EPL queries while creating buckets using WSO2 Developer Studio ? Is there any EPL query editor exist outside WSO2 stack ?
Madhup Srivastava
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define stream with complex type attributes

org.wso2.siddhi.query.api.definition.Attribute can only define elements of type STRING, INT, LONG, FLOAT, DOUBLE, BOOL How to define stream with complex type elements. e.g. Address { String street; String city; } Person{ String name; …
weima
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WSO2 CEP get UDP feed

I have successfully installed wso2 cep engine on Solaris 10 box. As events I'm receiving UDP feed (pipe separated data lines). How can I configure CEP engine to receive the UDP feed and process it? Thanks
Shanika
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How to recognize and verify a simple sequence of events with drools fusion

I'm unable to find the best way (the drools fusion way actually) to count "A" events between "B" events (STREAM mode). An example of sequence could be: B A A A B A A B A... A use case could be verify a sequence validity i.e there is always 3 "A"…
jineff
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Cassandra Rainbird

Does anybody know if the rainbird project for aggregations in cassandra has been committed in the main project? Does anybody have advice about real-time analytic choices? I was thinking of S4 also for CEP type functionality. Regards. Tom
Tommy Kennedy
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Esper EPL leftouter join forwarding to other stream

I have implemented ESPER for my application need of CEP. While using EPL I encountered a specific scenario which is as follows: I have combined two events with left outer join to make sure each event from first can trigger the statement and only…
Chaturvedi Dewashish
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StreamInsight Performance Issue

I'm using StreamInsight 2.1 and running into unexpected performance problems. I have one input adapter of Financial Data coming in with anywhere from 5,000 to 10,000 events per second. I then have a large number of queries operating against that…
timothymcgrath
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httpadapter in Esper CEP implementation

I need to send data to a web page from esper engine using httpadapter. I followed the steps mentioned in examples. Somehow it didn't wwork. I need to send using plain java object. Also let me know how to configure web server for the request and…
Chaturvedi Dewashish
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Esper: Using start/end-timestamps with POJOs or runtime defined event types

I am trying to use the time interval algebra methods on event types directly, which, according to the docs, should be possible. I first tried to define some event types using the create schema syntax, like this: create schema BaseEvent as (time…
Simon Lehmann
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How can scale complex event based processing? (best practices for algorithmic trading)

I have some algorithms that receive market data as events and process them to send order requests with an API. The problem is scaling these algorithms to support many users and many algorithm instances. If i use K8s, I have to assign a pod to each…
sohrab haghayegh
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Why method 2 is faster then method 1 even when method 2 is using O(2n) time complexity and method 1 is solving same problem in O(n)

I was solving Majority Element problem of GFG. I had done same problem with 2 approaches Method 1 static int majorityElement1(int a[], int size) { HashMap mp = new HashMap<>(); int count = 0; int maxNum =…
Patel Vishal
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NEsper Example explanation - StockTicker

I'm trying to understand the NEsper and it's examples. It seems like that the example - StockTicker is beginner level. Still I have difficulties to understand and implement this example. Can anyone tell me how to implement and test this example step…
Narsu
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Is necessary to use a RMI Server in Esper 8 in order to Runtime deploy Esper Workflows

I'm trying to make an Esper application thats permits me to Runtime deploy dataflow based patterns. In order to implement this, I used a RMI based server for sending patterns, but thinking on that, it may be not necessary. There is a way embedded in…
Ivan Castillo Caro
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Most efficient way to write 1000+ records to a database table

We have a product that requires writing 1000+ records to a database table once approved by a staff member in our company. The traditional way of writing this number of records at once could be to loop or MySQL bulk insert to the table…
Pavan Welihinda
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Augmenting events while event processing

There is an event processing application that is required to process events in real or near real time. It is expected to get 5000-10000 messages a minute. To process the incoming events it's needed to fetch additional data elements. For the sake of…
Stephen L.
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