ClientCallStreamObserver

java.lang.Object
- io.grpc.stub.CallStreamObserver<V>
- - io.grpc.stub.ClientCallStreamObserver<V>

All Implemented Interfaces:

StreamObserver<V>
```
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1788")
public abstract class ClientCallStreamObserver<V>
extends CallStreamObserver<V>
```
A refinement of CallStreamObserver that allows for lower-level interaction with client calls.
Like StreamObserver, implementations are not required to be thread-safe; if multiple threads will be writing to an instance concurrently, the application must synchronize its calls.
DO NOT MOCK: The API is too complex to reliably mock. Use InProcessChannelBuilder to create "real" RPCs suitable for testing and make a fake for the server-side.

Constructor Summary

Constructors
Constructor Description

ClientCallStreamObserver()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract void`	`cancel(java.lang.String message, java.lang.Throwable cause)`	Prevent any further processing for this `ClientCallStreamObserver`.

Methods inherited from class io.grpc.stub.CallStreamObserver
disableAutoInboundFlowControl, isReady, request, setMessageCompression, setOnReadyHandler

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

Methods inherited from interface io.grpc.stub.StreamObserver
onCompleted, onError, onNext

- Constructor Detail
  - ClientCallStreamObserver
```
public ClientCallStreamObserver()
```
- Method Detail
  - cancel
```
public abstract void cancel(@Nullable
                            java.lang.String message,
                            @Nullable
                            java.lang.Throwable cause)
```
    Prevent any further processing for this ClientCallStreamObserver. No further messages will be received. The server is informed of cancellations, but may not stop processing the call. Cancelling an already cancel()ed ClientCallStreamObserver has no effect.
    No other methods on this class can be called after this method has been called.
    It is recommended that at least one of the arguments to be non-null, to provide useful debug information. Both argument being null may log warnings and result in suboptimal performance. Also note that the provided information will not be sent to the server.
    
    Parameters:
    
    message - if not null, will appear as the description of the CANCELLED status
    
    cause - if not null, will appear as the cause of the CANCELLED status