BufferAccumulator (Flink : Runtime 2.0-preview1 API)

All Superinterfaces:

AutoCloseable

All Known Implementing Classes:

HashBufferAccumulator, SortBufferAccumulator
```
public interface BufferAccumulator
extends AutoCloseable
```
Accumulates received records into buffers. The BufferAccumulator receives the records from tiered store producer and the records will accumulate and transform into buffers.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the accumulator.
`void`	`receive(ByteBuffer record, TieredStorageSubpartitionId subpartitionId, Buffer.DataType dataType, boolean isBroadcast)`	Receives the records from tiered store producer, these records will be accumulated and transformed into finished buffers.
`void`	`setup(org.apache.flink.util.function.TriConsumer<TieredStorageSubpartitionId,Buffer,Integer> bufferFlusher)`	Setup the accumulator.

- Method Detail
  - setup
```
void setup(org.apache.flink.util.function.TriConsumer<TieredStorageSubpartitionId,Buffer,Integer> bufferFlusher)
```
    Setup the accumulator.
    
    Parameters:
    
    bufferFlusher - accepts the accumulated buffers. The first field is the subpartition id, the second is the accumulated buffer to flush, and the third is the number of remaining buffers to be written consecutively to the same segment.
  - receive
```
void receive(ByteBuffer record,
             TieredStorageSubpartitionId subpartitionId,
             Buffer.DataType dataType,
             boolean isBroadcast)
      throws IOException
```
    Receives the records from tiered store producer, these records will be accumulated and transformed into finished buffers.
    Note that when isBroadcast is true, for a broadcast-only partition, the subpartitionId value will always be 0. Conversely, for a non-broadcast-only partition, the subpartitionId value will range from 0 to the number of subpartitions.
    
    Parameters:
    
    record - the received record
    
    subpartitionId - the subpartition id of the record
    
    dataType - the data type of the record
    
    isBroadcast - whether the record is a broadcast record
    
    Throws:
    
    IOException
  - close
```
void close()
```
    Close the accumulator. This will flush all the remaining data and release all the resources.
    
    Specified by:
    
    close in interface AutoCloseable