EPL stands for the "Eltron Programming Language" and is a proprietary programming language used to communicate to Zebra (formerly Eltron) branded printers
Questions tagged [epl]
121 questions
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Esper : adding an event to Time-Accumulating window provided one condition on attribute
I've been working with Esper recently and there's a feature I missed in the documentation but it might exist.
I would like to store some events until no one pops up for 15 sec, and when it happens release them all.
One query does exactly that, it's…
Tchak
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esper grouping output multiple newEvents
My epl is simple:
select symbol, sum(price) from MarketData(symbol!='').win:time(5.5 sec) group by symbol
The listener:
update(EventBean[] newEvents, EventBean[] oldEvents) {
System.out.println(newEvents.length); //sometimes it's greater than…
bylijinnan
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Esper discard events
I have a platform that leverages Esper. However, all events are inserted into the Event table and sent to Esper to process. My rules are specific to only around 10% of the data set but the 90% other data going through the engine is bottlenecking my…
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Opposite of lastUnique()
New to Esper and EPL in general, i have two use cases which are basically the opposites of oneanother. First I need to catch all unique events in a timewindow, using firstunique(*parameters*).win:time(*time*).
Now what I need to do is the exact…
Christophe Schutz
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How to fire pattern on partial match in Esper CEP
I'm trying to solve route-violation problem. User defines a route as series of location sequences (in exact order) that some item needs to be seen on. So lets say that correct route is (this is defined by user)
A -> B -> C
I'm trying to write Esper…
rjovic
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EPL pattern to match latest A and all Bs with filter
I am trying to find an EPL pattern that will match the latest A followed by any & all B(prop1=A.prop1).
Using the same sequence as defined in Esper's documentation...
A1 B1 C1 B2 A2 D1 A3 B3 E1 A4 F1 B4
I am looking for a…
Nik
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Using epls for multiple dependent level calculations
I am new to Esper. I need help to maintain the EPL flow. I have a java class EsperTest.java, that class is sending the data to EPL for the calculation in every 10 Sec.
In EPL's I have 4 Compression Level. E.g. CompressionA, CompressionB,…
Ankit Jain
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Character problems Zebra label thermal printer
I want to use print product information on label printer. I have Zebra TLP 2844 This printer support EPL2 programming language. When I want to print non-ASCII character printer just print "?" instead of the correct character. What I did?
First I…
sancho
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How to keep distinctness until specific condition is true on EPL ESPER
I have two event types (A and B). I would like to write a pattern which detects every B event which comes after A event with the same id: every A -> B (A.id = B.id). However, it should be distinct ids. In other words, the pattern should ignore all A…
korujzade
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ESim (EPL Simulator) : don't know how to send data to printer
I'm using an Intermec printer PC43d set up for ESim.
And I don't know how to send data to this printer in PHP or javascript.
The printer is detected on my computer and I can print labels with bar code.
I would like to send to this printer something…
Fr0z3n7
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1 answer
Simple sequence of events
Assume events of either type A, B, C or D are being emitted. I want to detect whenever an event of type A is followed by an event of type B. In other words, I want to detect a sequences, for which Esper's EPL provides the -> operator.
However, what…
typeduke
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Esper user defined functions which takes two parameters
I want to write an esper epl expression which filter the events based on the return value returned by my user-defined function, my user defined must take two event objects at a time. so I wrote a query like this.
select window(*), 'CANDLE NAME' as…
Prasad Lakmal
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How to make esper epl divide section and compare value
I am new using esper. I don't know well about esper epl, so I'm in trouble.
Problem is this.
User define the value section.
For Example,
Level1 : 1~3
Level2 : 4~6
Level3 : 7~9
So when the data come first, check the section and make events.
But…
masa
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How do I print a counter function using EPL 2?
I can create a counter function using EPL, as well as print ascii text but I cannot figure out how to print a counter function in EPL. I have attempted to use the programming manual however the example used to print a counter does not work. I…
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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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