SpannerRpc.StreamingCall (Google Cloud Spanner 6.36.0 API)

Enclosing interface:

SpannerRpc
```
public static interface SpannerRpc.StreamingCall
```
Handle for cancellation of a streaming read or query call.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`cancel(String message)`	Cancels the call.
`void`	`request(int numMessages)`	Requests more messages from the stream.

- Method Detail
  - request
```
void request(int numMessages)
```
    Requests more messages from the stream. We disable the auto flow control mechanism in grpc, so we need to request messages ourself. This gives us more control over how much buffer we maintain in the client. Grpc will request 1 initial message automatically so we don't need to call this at the beginning. After that it should be called whenever there is a flow control window available based on the flow control setting configured by the client. Currently we do not have any flow control so this is called automatically when a message is received.
  - cancel
```
void cancel(@Nullable
            String message)
```
    Cancels the call.
    
    Parameters:
    
    message - a message to use in the final status of any underlying RPC