/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ratis.datastream;

import java.util.function.BiConsumer;

/** An interface similar to gRPC {@link  org.apache.ratis.thirdparty.io.grpc.stub.StreamObserver}. */
public interface DataStreamObserver<V> {
  void onNext(V value);

  void onCompleted();

  void onError(Throwable throwable);

  default <T> BiConsumer<T, Throwable> asWhenCompleteBiConsumer() {
    return (v, throwable) -> {
      if (throwable != null) {
        onError(throwable);
      } else  {
        onCompleted();
      }
    };
  }
}
