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https://issues.apache.org/jira/browse/FLINK-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger updated FLINK-4433:
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    Issue Type: Improvement  (was: Bug)

> Refactor the StreamSource.
> --------------------------
>
>                 Key: FLINK-4433
>                 URL: https://issues.apache.org/jira/browse/FLINK-4433
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>            Reporter: Kostas Kloudas
>            Assignee: Kostas Kloudas
>
> With the addition of continuous file monitoring, apart from the 
> {{StreamSource}} also the {{ContinuousFileReaderOperator}} uses a 
> {{SourceContext}}. Given this, all the implementations of the 
> {{SourceContext}} should be removed from the {{StreamSource}} and become 
> independent classes.
> In addition, the {{AsyncExceptionChecker}} interface should be removed as its 
> functionality can be replaced by the {{task.failExternally()}} method. This 
> also implies slight changes in the source context implementations. 
> Also in the {{trigger()}} method of the {{WatermarkEmittingTask}}, all the 
> {{owner.getCurrentProcessingTime()}} could be replaced by the {{timestamp}} 
> argument of that method. This will remove some of the calls to the 
> {{getCurrentProcessingTime()}} which can be expensive.



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