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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.channel;
  
  import io.netty.util.concurrent.Future;
  import io.netty.util.concurrent.GenericFutureListener;
  import io.netty.util.concurrent.Promise;
  
  /**
   * Special {@link ChannelFuture} which is writable.
   */
  public interface ChannelPromise extends ChannelFuture, Promise<Void> {
  
      @Override
      Channel channel();
  
      @Override
      ChannelPromise setSuccess(Void result);
  
      ChannelPromise setSuccess();
  
      boolean trySuccess();
  
      @Override
      ChannelPromise setFailure(Throwable cause);
  
      @Override
      ChannelPromise addListener(GenericFutureListener<? extends Future<? super Void>> listener);
  
      @Override
      ChannelPromise addListeners(GenericFutureListener<? extends Future<? super Void>>... listeners);
  
      @Override
      ChannelPromise removeListener(GenericFutureListener<? extends Future<? super Void>> listener);
  
      @Override
      ChannelPromise removeListeners(GenericFutureListener<? extends Future<? super Void>>... listeners);
  
      @Override
      ChannelPromise sync() throws InterruptedException;
  
      @Override
      ChannelPromise syncUninterruptibly();
  
      @Override
      ChannelPromise await() throws InterruptedException;
  
      @Override
      ChannelPromise awaitUninterruptibly();
  
      /**
       * Returns a new {@link ChannelPromise} if {@link #isVoid()} returns {@code true} otherwise itself.
       */
      ChannelPromise unvoid();
  }