[Fiware-tech-help] Questions about CEP usage scenario

[Tali Yatzkar-Haham]

Dear Ahmed,

1. In your definition you define Event Type. Event type has a name and 
list of attributes (each with a name and a type). In run time, many event 
instances can be of the same type (have the same name and the same list of 
attribute names). For example, you can define event type E1 with attribute 
patientID. At run time, you can have many E1 event instances with 
different values of patientID.

2. The Post supports sending one event only.

3. Arrays are not supported for input event attributes (they were 
supported in a previous version, so we do have array functions, and those 
functions can be used in our current version over derived events only) 

Best Regards,
Tali

Tali Yatzkar Haham
Event-based Middleware & Solutions
IBM Haifa Research Lab, Israel
tali at il.ibm.com 972-4-8296320
 



From:   Ahmed Sadek <Ahmed.Sadek at acreo.se>
To:     Tali Yatzkar-Haham/Haifa/IBM at IBMIL
Cc:     "altugguner90 at gmail.com" <altugguner90 at gmail.com>, Mikhail Popov 
<Mikhail.Popov at acreo.se>
Date:   14/04/2015 05:32 PM
Subject:        Questions about CEP usage scenario



Dear Tali, 

I have few questions regarding the usage of CEP in our project.

1- In the project we are dealing with patient data and need to have 
different rules for different patient data, where the CEP will generate 
events based on this rules. So how we can implement this:

patientID=1 and Hear rate data=[100,120,140,...etc]
patientID=2 and Hear rate data=[100,120,140,...etc]
Do we need multiple EPN or single EPN with different events ?, can we have 
multiple conditions ?


2- When we try to send Post with two lines, we notice the CEP only check 
the first line.
for example:
Post -> 
{"Name":"TrafficReport", "patientId":"1","HeartRate":"120"}
{"Name":"TrafficReport", "patientId":"2","HeartRate":"120"}

The CEP only report for the first line in the output file !

3- How to input the heart rate data, it's an array of measurements 
[100,120,140,...etc] and we would like to check if some elements are above 
or below certain threshold or have certain pattern , can we input it as 
attribute of event of type object ?
I noticed in the implemented functions there is:
ArrayHasGreaterThan ? ArrayHasGreaterThan(a,v) checks whether the array a 
contains an element with a value greater than v. Returns a Boolean value. 
?
ArrayHasLessThan ? ArrayHasLessThan(a,v checks whether the array a 
contains an element with a value less than v. Returns a Boolean value. 
How we can use those functions ?

CC in the email, my college in the project Altug.Guner

Best,
Ahmed Sadek
Acreo
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