BlockingBackChannel (Flink : Runtime 2.1.0 API)

java.lang.Object
- org.apache.flink.runtime.iterative.concurrent.BlockingBackChannel

```
public class BlockingBackChannel
extends Object
```
A concurrent datastructure that establishes a backchannel buffer between an iteration head and an iteration tail.

Constructor Summary

Constructors
Constructor Description

BlockingBackChannel(SerializedUpdateBuffer buffer)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.apache.flink.core.memory.DataInputView`	`getReadEndAfterSuperstepEnded()`	Called by iteration head after it has sent all input for the current superstep through the data channel (blocks iteration head).
`org.apache.flink.core.memory.DataOutputView`	`getWriteEnd()`	Called by iteration tail to save the output of the current superstep.
`void`	`notifyOfEndOfSuperstep()`	Called by iteration tail to signal that all input of a superstep has been processed (unblocks iteration head).

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

- Constructor Detail
  - BlockingBackChannel
```
public BlockingBackChannel(SerializedUpdateBuffer buffer)
```
- Method Detail
  - getReadEndAfterSuperstepEnded
```
public org.apache.flink.core.memory.DataInputView getReadEndAfterSuperstepEnded()
```
    Called by iteration head after it has sent all input for the current superstep through the data channel (blocks iteration head).
  - getWriteEnd
```
public org.apache.flink.core.memory.DataOutputView getWriteEnd()
```
    Called by iteration tail to save the output of the current superstep.
  - notifyOfEndOfSuperstep
```
public void notifyOfEndOfSuperstep()
```
    Called by iteration tail to signal that all input of a superstep has been processed (unblocks iteration head).