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https://issues.apache.org/jira/browse/FLINK-8124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16265309#comment-16265309
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Aljoscha Krettek commented on FLINK-8124:
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I think that should be feasible, yes.
> EventTimeTrigger (and other triggers) could have less specific generic types
> ----------------------------------------------------------------------------
>
> Key: FLINK-8124
> URL: https://issues.apache.org/jira/browse/FLINK-8124
> Project: Flink
> Issue Type: Improvement
> Components: Core
> Reporter: Cristian
> Priority: Minor
>
> When implementing custom WindowAssigners, it is possible to need different
> implementations of the {{Window}} class (other than {{TimeWindow}}). In such
> cases, it is not possible to use the existing triggers (e.g.
> {{EventTimeTrigger}}) because it extends from {{Trigger<Object, TimeWindow>}}
> which is (unnecessarily?) specific.
> It should be possible to make that class more generic by using
> {{EventTimeTrigger<T, W extends Window> extends Trigger<T, W>}} instead.
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