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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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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;

import org.jboss.netty.buffer.ChannelBuffer;

/**
 * Predicts the number of readable bytes in the receive buffer of a
 * {@link Channel}.
 * 
 * It calculates the close-to-optimal capacity of the {@link ChannelBuffer}
 * for the next read operation depending on the actual number of read bytes
 * in the previous read operation.  More accurate the prediction is, more
 * effective the memory utilization will be.
 * 
 * Once a read operation is performed and the actual number of read bytes is
 * known, an I/O thread will call {@link #previousReceiveBufferSize(int)} to
 * update the predictor so it can predict more accurately next time.
 */
public interface ReceiveBufferSizePredictor {

    /**
     * Predicts the capacity of the {@link ChannelBuffer} for the next
     * read operation depending on the actual number of read bytes in the
     * previous read operation.
     *
     * @return the expected number of readable bytes this time
     */
    int nextReceiveBufferSize();

    /**
     * Updates this predictor by specifying the actual number of read bytes
     * in the previous read operation.
     *
     * @param previousReceiveBufferSize
     *        the actual number of read bytes in the previous read operation
     */
    void previousReceiveBufferSize(int previousReceiveBufferSize);
}