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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.channel.ChannelFlushPromiseNotifier.FlushCheckpoint;
  import io.netty.util.concurrent.DefaultPromise;
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.concurrent.Future;
  import io.netty.util.concurrent.GenericFutureListener;
  
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  
  /**
   * The default {@link ChannelPromise} implementation.  It is recommended to use {@link Channel#newPromise()} to create
   * a new {@link ChannelPromise} rather than calling the constructor explicitly.
   */
  public class DefaultChannelPromise extends DefaultPromise<Void> implements ChannelPromise, FlushCheckpoint {
  
      private final Channel channel;
      private long checkpoint;
  
      /**
       * Creates a new instance.
       *
       * @param channel
       *        the {@link Channel} associated with this future
       */
      public DefaultChannelPromise(Channel channel) {
          this.channel = checkNotNull(channel, "channel");
      }
  
      /**
       * Creates a new instance.
       *
       * @param channel
       *        the {@link Channel} associated with this future
       */
      public DefaultChannelPromise(Channel channel, EventExecutor executor) {
          super(executor);
          this.channel = checkNotNull(channel, "channel");
      }
  
      @Override
      protected EventExecutor executor() {
          EventExecutor e = super.executor();
          if (e == null) {
              return channel().eventLoop();
          } else {
              return e;
          }
      }
  
      @Override
      public Channel channel() {
          return channel;
      }
  
      @Override
      public ChannelPromise setSuccess() {
          return setSuccess(null);
      }
  
      @Override
      public ChannelPromise setSuccess(Void result) {
          super.setSuccess(result);
          return this;
      }
  
      @Override
      public boolean trySuccess() {
          return trySuccess(null);
      }
  
      @Override
      public ChannelPromise setFailure(Throwable cause) {
          super.setFailure(cause);
          return this;
      }
  
      @Override
      public ChannelPromise addListener(GenericFutureListener<? extends Future<? super Void>> listener) {
          super.addListener(listener);
          return this;
      }
  
      @Override
     public ChannelPromise addListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
         super.addListeners(listeners);
         return this;
     }
 
     @Override
     public ChannelPromise removeListener(GenericFutureListener<? extends Future<? super Void>> listener) {
         super.removeListener(listener);
         return this;
     }
 
     @Override
     public ChannelPromise removeListeners(GenericFutureListener<? extends Future<? super Void>>... listeners) {
         super.removeListeners(listeners);
         return this;
     }
 
     @Override
     public ChannelPromise sync() throws InterruptedException {
         super.sync();
         return this;
     }
 
     @Override
     public ChannelPromise syncUninterruptibly() {
         super.syncUninterruptibly();
         return this;
     }
 
     @Override
     public ChannelPromise await() throws InterruptedException {
         super.await();
         return this;
     }
 
     @Override
     public ChannelPromise awaitUninterruptibly() {
         super.awaitUninterruptibly();
         return this;
     }
 
     @Override
     public long flushCheckpoint() {
         return checkpoint;
     }
 
     @Override
     public void flushCheckpoint(long checkpoint) {
         this.checkpoint = checkpoint;
     }
 
     @Override
     public ChannelPromise promise() {
         return this;
     }
 
     @Override
     protected void checkDeadLock() {
         if (channel().isRegistered()) {
             super.checkDeadLock();
         }
     }
 
     @Override
     public ChannelPromise unvoid() {
         return this;
     }
 
     @Override
     public boolean isVoid() {
         return false;
     }
 }