EpochManager (Flink : Runtime 2.0-preview1 API)

java.lang.Object
- org.apache.flink.runtime.asyncprocessing.EpochManager

```
public class EpochManager
extends Object
```
Epoch manager segments inputs into distinct epochs, marked by the arrival of non-records(e.g. watermark, record attributes). Records are assigned to a unique epoch based on their arrival, records within an epoch are allowed to be parallelized, while the non-record of an epoch can only be executed when all records in this epoch have finished.
For more details please refer to FLIP-425.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`EpochManager.Epoch`	All inputs are segment into distinct epochs, marked by the arrival of non-record inputs.
`static class`	`EpochManager.ParallelMode`	This enum defines whether parallel execution between epochs is allowed.

Constructor Summary

Constructors
Constructor Description

EpochManager(AsyncExecutionController<?> aec)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`completeOneRecord(EpochManager.Epoch epoch)`	Complete one record in the specific epoch.
`void`	`onNonRecord(Runnable action, EpochManager.ParallelMode parallelMode)`	Add a non-record to the current epoch, close current epoch and open a new epoch.
`EpochManager.Epoch`	`onRecord()`	Add a record to the current epoch and return the current open epoch, the epoch will be associated with the `RecordContext` of this record.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - EpochManager
```
public EpochManager(AsyncExecutionController<?> aec)
```
- Method Detail
  - onRecord
```
public EpochManager.Epoch onRecord()
```
    Add a record to the current epoch and return the current open epoch, the epoch will be associated with the RecordContext of this record. Must be invoked within task thread.
    
    Returns:
    
    the current open epoch.
  - onNonRecord
```
public void onNonRecord(Runnable action,
                        EpochManager.ParallelMode parallelMode)
```
    Add a non-record to the current epoch, close current epoch and open a new epoch. Must be invoked within task thread.
    
    Parameters:
    
    action - the action associated with this non-record.
    
    parallelMode - the parallel mode for this epoch.
  - completeOneRecord
```
public void completeOneRecord(EpochManager.Epoch epoch)
```
    Complete one record in the specific epoch. Must be invoked within task thread.
    
    Parameters:
    
    epoch - the specific epoch