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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:
 *
 *   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.jboss.netty.channel;

/**
 * A {@link ChannelEvent} which represents the notification of the state of
 * a child {@link Channel}.  This event is for going upstream only.  Please
 * refer to the {@link ChannelEvent} documentation to find out what an upstream
 * event and a downstream event are and what fundamental differences they have.
 */
public interface ChildChannelStateEvent extends ChannelEvent {

    /**
     * Returns the parent {@link Channel} which is associated
     * with this event.  Please note that you should use {@link #getChildChannel()}
     * to get the {@link Channel} created or accepted by the parent {@link Channel}.
     */
    Channel getChannel();

    /**
     * Returns the child {@link Channel} whose state has been changed.
     */
    Channel getChildChannel();
}