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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 completion
 * of a write request on a {@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 WriteCompletionEvent extends ChannelEvent {
    /**
     * Returns the amount of data written.
     *
     * @return the number of written bytes or messages, depending on the
     *         type of the transport
     */
    long getWrittenAmount();
}