content: /*
   * 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.bookkeeper.common.concurrent;
  
  import java.util.concurrent.CompletionException;
  import java.util.function.BiConsumer;
  
  /**
   * Provide similar interface (as twitter future) over java future.
   */
  public interface FutureEventListener<T> extends BiConsumer<T, Throwable> {
  
    void onSuccess(T value);
  
    void onFailure(Throwable cause);
  
    @Override
    default void accept(T t, Throwable throwable) {
      if (null != throwable) {
        if (throwable instanceof CompletionException && null != throwable.getCause()) {
          onFailure(throwable.getCause());
        } else {
          onFailure(throwable);
        }
        return;
      }
      onSuccess(t);
    }
  }
  