ConnectionManager (Flink : Runtime 2.1.0 API)

All Known Implementing Classes:

LocalConnectionManager, NettyConnectionManager
```
public interface ConnectionManager
```
The connection manager manages physical connections for the (logical) remote input channels at runtime.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`closeOpenChannelConnections(ConnectionID connectionId)`	Closes opened ChannelConnections in case of a resource release.
`PartitionRequestClient`	`createPartitionRequestClient(ConnectionID connectionId)`	Creates a `PartitionRequestClient` instance for the given `ConnectionID`.
`int`	`getNumberOfActiveConnections()`
`void`	`shutdown()`
`int`	`start()`	Starts the internal related components for network connection and communication.

- Method Detail
  - start
```
int start()
   throws IOException
```
    Starts the internal related components for network connection and communication.
    
    Returns:
    
    a port to connect to the task executor for shuffle data exchange, -1 if only local connection is possible.
    
    Throws:
    
    IOException
  - createPartitionRequestClient
```
PartitionRequestClient createPartitionRequestClient(ConnectionID connectionId)
                                             throws IOException,
                                                    InterruptedException
```
    Creates a PartitionRequestClient instance for the given ConnectionID.
    
    Throws:
    
    IOException
    
    InterruptedException
  - closeOpenChannelConnections
```
void closeOpenChannelConnections(ConnectionID connectionId)
```
    Closes opened ChannelConnections in case of a resource release.
  - getNumberOfActiveConnections
```
int getNumberOfActiveConnections()
```
  - shutdown
```
void shutdown()
       throws IOException
```
    Throws:
    
    IOException