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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   * A {@link ChannelEvent} which represents the notification of an exception
20   * raised by a {@link ChannelHandler} or an I/O thread.  This event is for
21   * going upstream only.  Please refer to the {@link ChannelEvent} documentation
22   * to find out what an upstream event and a downstream event are and what
23   * fundamental differences they have.
24   */
25  public interface ExceptionEvent extends ChannelEvent {
26  
27      /**
28       * Returns the raised exception.
29       */
30      Throwable getCause();
31  }