nl.topicus.jdbc.shaded.io.grpc.stub.StreamObserver Maven / Gradle / Ivy
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/*
* Copyright 2014, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package nl.topicus.jdbc.shaded.io.grpc.stub;
/**
* Receives notifications from an observable stream of messages.
*
* It is used by both the client stubs and service implementations for sending or receiving
* stream messages. It is used for all {@link nl.topicus.jdbc.shaded.io.grpc.MethodDescriptor.MethodType}, including
* {@code UNARY} calls. For outgoing messages, a {@code StreamObserver} is provided by the GRPC
* library to the application. For incoming messages, the application implements the
* {@code StreamObserver} and passes it to the GRPC library for receiving.
*
*
Implementations are expected to be
* thread-nl.topicus.jdbc.shaded.com.atible.
* Separate {@code StreamObserver}s do
* not need to be synchronized together; incoming and outgoing directions are independent.
* Since individual {@code StreamObserver}s are not thread-safe, if multiple threads will be
* writing to a {@code StreamObserver} concurrently, the application must synchronize calls.
*/
public interface StreamObserver {
/**
* Receives a value from the stream.
*
* Can be called many times but is never called after {@link #onError(Throwable)} or {@link
* #onCompleted()} are called.
*
*
Unary calls must invoke onNext at most once. Clients may invoke onNext at most once for
* server streaming calls, but may receive many onNext callbacks. Servers may invoke onNext at
* most once for client streaming calls, but may receive many onNext callbacks.
*
*
If an exception is thrown by an implementation the caller is expected to terminate the
* stream by calling {@link #onError(Throwable)} with the caught exception prior to
* propagating it.
*
* @param value the value passed to the stream
*/
void onNext(V value);
/**
* 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 {@code onError} no further calls to any method are
* allowed.
*
*
{@code t} should be a {@link nl.topicus.jdbc.shaded.io.grpc.StatusException} or {@link
* nl.topicus.jdbc.shaded.io.grpc.StatusRuntimeException}, but other {@code Throwable} types are possible. Callers should
* generally convert from a {@link nl.topicus.jdbc.shaded.io.grpc.Status} via {@link nl.topicus.jdbc.shaded.io.grpc.Status#asException()} or
* {@link nl.topicus.jdbc.shaded.io.grpc.Status#asRuntimeException()}. Implementations should generally convert to a
* {@code Status} via {@link nl.topicus.jdbc.shaded.io.grpc.Status#fromThrowable(Throwable)}.
*
* @param t the error occurred on the stream
*/
void onError(Throwable t);
/**
* Receives a notification of successful stream nl.topicus.jdbc.shaded.com.letion.
*
*
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 {@code onCompleted} no further calls to any method
* are allowed.
*/
void onCompleted();
}