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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.channel;
17  
18  /**
19   * The {@link CompleteChannelFuture} which is failed already.  It is
20   * recommended to use {@link Channels#failedFuture(Channel, Throwable)}
21   * instead of calling the constructor of this future.
22   */
23  public class FailedChannelFuture extends CompleteChannelFuture {
24  
25      private final Throwable cause;
26  
27      /**
28       * Creates a new instance.
29       *
30       * @param channel the {@link Channel} associated with this future
31       * @param cause   the cause of failure
32       */
33      public FailedChannelFuture(Channel channel, Throwable cause) {
34          super(channel);
35          if (cause == null) {
36              throw new NullPointerException("cause");
37          }
38          this.cause = cause;
39      }
40  
41      public Throwable getCause() {
42          return cause;
43      }
44  
45      public boolean isSuccess() {
46          return false;
47      }
48  
49      public ChannelFuture sync() throws InterruptedException {
50          rethrow();
51          return this;
52      }
53  
54      public ChannelFuture syncUninterruptibly() {
55          rethrow();
56          return this;
57      }
58  
59      private void rethrow() {
60          if (cause instanceof RuntimeException) {
61              throw (RuntimeException) cause;
62          }
63  
64          if (cause instanceof Error) {
65              throw (Error) cause;
66          }
67  
68          throw new ChannelException(cause);
69      }
70  }