PartitionGroupReleaseStrategy (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

NotReleasingPartitionGroupReleaseStrategy, RegionPartitionGroupReleaseStrategy
```
public interface PartitionGroupReleaseStrategy
```
Interface for strategies that decide when to release ConsumedPartitionGroups.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface PartitionGroupReleaseStrategy.Factory
Factory for PartitionGroupReleaseStrategy.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`List<ConsumedPartitionGroup>`	`vertexFinished(ExecutionVertexID finishedVertex)`	Calling this method informs the strategy that a vertex finished.
`void`	`vertexUnfinished(ExecutionVertexID executionVertexID)`	Calling this method informs the strategy that a vertex is no longer in finished state, e.g., when a vertex is re-executed.

- Method Detail
  - vertexFinished
```
List<ConsumedPartitionGroup> vertexFinished(ExecutionVertexID finishedVertex)
```
    Calling this method informs the strategy that a vertex finished.
    
    Parameters:
    
    finishedVertex - Id of the vertex that finished the execution
    
    Returns:
    
    A list of ConsumedPartitionGroups that can be released
  - vertexUnfinished
```
void vertexUnfinished(ExecutionVertexID executionVertexID)
```
    Calling this method informs the strategy that a vertex is no longer in finished state, e.g., when a vertex is re-executed.
    
    Parameters:
    
    executionVertexID - Id of the vertex that is no longer in finished state.