Class StateCheckingResponseObserver<V> (2.43.0)

Base implementation of ResponseObserver that performs state sanity checks.

Receives a notification of successful stream completion.

May only be called once, and if called, it must be the last method called. In particular, if an exception is thrown by an implementation of onComplete, no further calls to any method are allowed.

This implementation simply delegates to #onCompleteImpl() after ensuring consistent state.

See Also: #onComplete()

Receives a terminating error from the stream.

May only be called once, and if called, it must be the last method called. In particular, if an exception is thrown by an implementation of onError, no further calls to any method are allowed.

This implementation simply delegates to #onErrorImpl(Throwable) after ensuring consistent state.

See Also: #onErrorImpl(Throwable)

Receives a value from the stream.

Can be called many times but is never called after #onError(Throwable) or #onComplete() are called.

Clients may may receive 0 or more onResponse callbacks.

If an exception is thrown by an implementation the caller will terminate the stream by calling #onError(Throwable) with the caught exception as the cause.

This implementation simply delegates to #onResponseImpl(Object) after ensuring consistent state.

See Also: #onResponse(Object)

Called before the stream is started. This must be invoked synchronously on the same thread that called ServerStreamingCallable#call(Object, ResponseObserver, ApiCallContext)

Allows for disabling flow control and early stream termination via StreamController.

This implementation simply delegates to #onStartImpl(StreamController) after ensuring consistent state.

See Also: #onStart(StreamController)