CoordinationRequestGateway (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

ClusterClientJobClientAdapter, EmbeddedJobClient, MiniClusterJobClient
```
public interface CoordinationRequestGateway
```
Client interface which sends out a CoordinationRequest and expects for a CoordinationResponse from a OperatorCoordinator.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`CompletableFuture<CoordinationResponse>`	`sendCoordinationRequest(String operatorUid, CoordinationRequest request)`	Send out a request to a specified coordinator and return the response.

- Method Detail
  - sendCoordinationRequest
```
CompletableFuture<CoordinationResponse> sendCoordinationRequest(String operatorUid,
                                                                CoordinationRequest request)
```
    Send out a request to a specified coordinator and return the response.
    On the client side, a unique operatorUid must be defined to identify an operator. Otherwise, the query cannot be executed correctly. Note that we use operatorUid instead of operatorID because the latter is an internal runtime concept that cannot be recognized by the client.
    
    Parameters:
    
    operatorUid - specifies which coordinator to receive the request
    
    request - the request to send
    
    Returns:
    
    the response from the coordinator