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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