[GitHub] [streampipes] dominikriemer opened a new issue, #761: Redesign the remove duplicates function for adapters

[GitBox <gi...@apache.org>]

dominikriemer opened a new issue, #761:
URL: https://github.com/apache/streampipes/issues/761

   ## Current functionality
   
   A user can select the *remove duplicate* option in the start adapter tab and select the *time interval* how long events are stored in cache (class: `{}org.apache.streampipes.connect.adapter.preprocessing.transform.stream.DuplicateFilterPipelineElement{`})
   ### Problems
    * The state is not persisted when an adapter is restarted
    * No option to ignore the timestamp field
   
   ### New functionality
    * A user should be able to add the remove duplicate rule with the option to ignore the timestamp field.
    * A user should be able to restart an adapter without loosing the state of the remove duplicate rule
   
   ### Info
    * To do that we need to extend the API of adapters and add the functionality to execute code when an adapter is stopped
    * An API to load data (on startup) and persist (on shutdown) for elements is required
   
   Imported from Jira [STREAMPIPES-582](https://issues.apache.org/jira/browse/STREAMPIPES-582). Original Jira may contain additional context.
   Reported by: zehnder.


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