Comments (2)
marcc-orange
commented on June 12, 2024
I understand you are trying to serialize a Tracker type to a Text type.
This was not anticipated, so you found an edge case.
Sadly, Cepheus CEP does not handle nesting of types (it would be nice to be able to just define the nested attribute is a Tracker (e.g { "name":"nested", "type":"Tracker" } in the out configuration).
For reference, others projects having the same problem with serializing a JTS Point geometry which seem related to your issue: bedatadriven/jackson-datatype-jts#8 and bedatadriven/jackson-datatype-jts#15.
What is unclear for me, is why you would like to serialize the whole Tracker event to Text when you already asked to match all its fields to the Alert type. The time and location from an Alert are taken from the Tracker, so why not add additional attributes if you need more info from the Tracker type in your Alert type.
If this is because you simplified the statement to demonstrate the problem compared to the original Geofencing example, maybe a solution in the mean time would be transpose each of the properties from the Tracker you want in the Alert like this:
{
"service": "test",
"servicePath": "/tracker",
"host": "http://172.17.0.1:8080",
"reset": true,
"statements": [
"INSERT INTO Alert SELECT *,
t.id as nestedAlertId,
t.location as nestedAlertLocation,
t.time as nestedAlertTime
FROM Tracker t WHERE NOT polygon({point(0, 0), point(0,50), point(50,50), point(50, 0), point(0, 0)}).contains(t.location)"
],
"in": [
{
"id": ".*",
"type": "Tracker",
"isPattern": true,
"attributes": [
{
"name": "time",
"type": "date"
},
{
"name": "location",
"type": "geo:point"
}
],
"providers": [
{
"url": "http://172.17.0.1:1026",
"service": "test",
"servicePath": "/tracker"
}
]
}
],
"out": [
{
"id": "Fence1",
"type": "Alert",
"attributes": [
{
"name": "time",
"type": "date"
},
{
"name": "location",
"type": "geo:point"
},
{
"name": "inside",
"type": "boolean"
},
{
"name": "nestedAlertId",
"type": "string"
},
{
"name": "nestedAlertLocation",
"type": "geo:point"
},
{
"name": "nestedAlertTime",
"type": "date"
}
],
"brokers": [
{
"url": "http://172.17.0.1:1026",
"serviceName": "test",
"servicePath": "/tracker",
"authToken": null
}
]
}
]
}from fiware-cepheus.
efviodo
commented on June 12, 2024
The reason why I am trying to serialize the whole Tracker as "text" (could be even java.util.Map) is because Cepheus is part of a much more complex architecture of an IoT application where I have multiples types of context entities and each one generates Alerts. Then I am working on a integration component that takes each Alert and for example send it to a third party system (could be fire an Email, etc).
Since each context entity have a different schema (entity type) I want to define something like an "Envelope" entity type for all the alerts in order to get a common set of attributes, most of them for internal use. That's the reason why I am putting the whole Tracker info into a single attribute in my example. Just to clarify, I am not serializing Tracker as "text", in fact I am using type "java.util.Map". I put it as "text" in the issue just to make it simple.
In the meantime I can "flat" the whole context as you suggests at the cost of losing the "common" envelope.
Thank you and I hope you can incorporate this issue as a future bug fixes.
Best Regards.
from fiware-cepheus.
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