[FLINK-13767] Refactor StreamInputProcessor#processInput based on InputStatus

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.10.0
• Component/s: Runtime / Network, Runtime / Task
• Labels: pull-request-available
• Assignee: Zhijiang
• Reporter: Zhijiang
• Created: 19/Aug/19 00:39
• Updated: 25/Sep/19 07:48
• Resolved: 25/Sep/19 07:48

Description

StreamInputProcessor#processInput could return InputStatus instead of current boolean value to keep consistent with PushingAsyncDataInput#emitNext.

For the implementation of StreamTwoInputProcessor#processInput, we could maintain and judge the two input status together with the next selected input index to determine the final precise status. To do so we could avoid invalid processInput call except for the first call.

 In addition, AvailabilityProvider#isFinished has the duplicated semantic with InputStatus#END_OF_INPUT for PushingAsyncDataInput, and it is only meaningful for PullingAsyncDataInput now. So we migrate the #isFinished method from AvailabilityProvider to PullingAsyncDataInput.

Issue Links

• links to: GitHub Pull Request #9483