[jira] [Created] (EDGENT-378) Support an edgentControl for interacting with application properties

["Dale LaBossiere (JIRA)" <ji...@apache.org>]

Dale LaBossiere created EDGENT-378:
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             Summary: Support an edgentControl for interacting with application properties
                 Key: EDGENT-378
                 URL: https://issues.apache.org/jira/browse/EDGENT-378
             Project: Edgent
          Issue Type: New Feature
          Components: Providers
            Reporter: Dale LaBossiere


Use case: I want to be able to dynamically control the settings/behavior of my Edgent application via the IoT hub by changing the values of its control properties/preferences.  E.g., I have an application preference that can be used to control a [Valve|https://github.com/apache/incubator-edgent/blob/master/api/topology/src/main/java/org/apache/edgent/topology/plumbing/Valve.java], or a preference to control the period that my periodic-source is using, etc.  I want a standard Edgent service that exposes controlling my settings.

[IotProvider|https://github.com/apache/incubator-edgent/blob/master/providers/iot/src/main/java/org/apache/edgent/providers/iot/IotProvider.java] already includes a java.util.Preferences service that my application can use for its preferences.  Preferences includes the ability to listen for change events.  So my application can listen for a change to its boolean "xyz.valveOpen" preference and its listener can call {{Valve.setOpen(boolean)}} to change its state.
I should be able to continue to use that throughout my application for its preferences.  But I don't think an application should be required to use it to support the ability to receive requests to set or reset the value of some "attribute".

I believe this new service should be controllable via an "edgentControl" command request - see [IotProvider|https://edgent.apache.org/javadoc/latest/org/apache/edgent/providers/iot/package-summary.html].  

In the event that the IoT hub has existing infrastructure for device attributes the new service should integrate with it.



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