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• NioSocketChannelConfig.java

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org.jboss.netty.channel.socket.nio.NioSocketChannelConfig Maven / Gradle / Ivy

/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat 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.socket.nio;

import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;

import org.jboss.netty.channel.AdaptiveReceiveBufferSizePredictor;
import org.jboss.netty.channel.AdaptiveReceiveBufferSizePredictorFactory;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelConfig;
import org.jboss.netty.channel.ReceiveBufferSizePredictor;
import org.jboss.netty.channel.ReceiveBufferSizePredictorFactory;
import org.jboss.netty.channel.socket.SocketChannel;
import org.jboss.netty.channel.socket.SocketChannelConfig;

/**
 * A {@link SocketChannelConfig} for a NIO TCP/IP {@link SocketChannel}.
 *
 * 
Available options
 *
 * In addition to the options provided by {@link ChannelConfig} and
 * {@link SocketChannelConfig}, {@link NioSocketChannelConfig} allows the
 * following options in the option map:
 *
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
Name
Associated setter method
{@code "writeBufferHighWaterMark"}
{@link #setWriteBufferHighWaterMark(int)}
{@code "writeBufferLowWaterMark"}
{@link #setWriteBufferLowWaterMark(int)}
{@code "writeSpinCount"}
{@link #setWriteSpinCount(int)}
{@code "receiveBufferSizePredictor"}
{@link #setReceiveBufferSizePredictor(ReceiveBufferSizePredictor)}
{@code "receiveBufferSizePredictorFactory"}
{@link #setReceiveBufferSizePredictorFactory(ReceiveBufferSizePredictorFactory)}
 *
 * @author The Netty Project
 * @author Trustin Lee
 *
 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
 */
public interface NioSocketChannelConfig extends SocketChannelConfig {

    /**
     * Returns the high water mark of the write buffer.  If the number of bytes
     * queued in the write buffer exceeds this value, {@link Channel#isWritable()}
     * will start to return {@code false}.
     */
    int getWriteBufferHighWaterMark();

    /**
     * Sets the high water mark of the write buffer.  If the number of bytes
     * queued in the write buffer exceeds this value, {@link Channel#isWritable()}
     * will start to return {@code false}.
     */
    void setWriteBufferHighWaterMark(int writeBufferHighWaterMark);

    /**
     * Returns the low water mark of the write buffer.  Once the number of bytes
     * queued in the write buffer exceeded the
     * {@linkplain #setWriteBufferHighWaterMark(int) high water mark} and then
     * dropped down below this value, {@link Channel#isWritable()} will return
     * {@code true} again.
     */
    int getWriteBufferLowWaterMark();

    /**
     * Sets the low water mark of the write buffer.  Once the number of bytes
     * queued in the write buffer exceeded the
     * {@linkplain #setWriteBufferHighWaterMark(int) high water mark} and then
     * dropped down below this value, {@link Channel#isWritable()} will return
     * {@code true} again.
     */
    void setWriteBufferLowWaterMark(int writeBufferLowWaterMark);

    /**
     * Returns the maximum loop count for a write operation until
     * {@link WritableByteChannel#write(ByteBuffer)} returns a non-zero value.
     * It is similar to what a spin lock is used for in concurrency programming.
     * It improves memory utilization and write throughput depending on
     * the platform that JVM runs on.  The default value is {@code 16}.
     */
    int getWriteSpinCount();

    /**
     * Sets the maximum loop count for a write operation until
     * {@link WritableByteChannel#write(ByteBuffer)} returns a non-zero value.
     * It is similar to what a spin lock is used for in concurrency programming.
     * It improves memory utilization and write throughput depending on
     * the platform that JVM runs on.  The default value is {@code 16}.
     *
     * @throws IllegalArgumentException
     *         if the specified value is {@code 0} or less than {@code 0}
     */
    void setWriteSpinCount(int writeSpinCount);

    /**
     * Returns the {@link ReceiveBufferSizePredictor} which predicts the
     * number of readable bytes in the socket receive buffer.  The default
     * predictor is {@link AdaptiveReceiveBufferSizePredictor}(64, 1024, 65536).
     */
    ReceiveBufferSizePredictor getReceiveBufferSizePredictor();

    /**
     * Sets the {@link ReceiveBufferSizePredictor} which predicts the
     * number of readable bytes in the socket receive buffer.  The default
     * predictor is {@link AdaptiveReceiveBufferSizePredictor}(64, 1024, 65536).
     */
    void setReceiveBufferSizePredictor(ReceiveBufferSizePredictor predictor);

    /**
     * Returns the {@link ReceiveBufferSizePredictorFactory} which creates a new
     * {@link ReceiveBufferSizePredictor} when a new channel is created and
     * no {@link ReceiveBufferSizePredictor} was set.  If no predictor was set
     * for the channel, {@link #setReceiveBufferSizePredictor(ReceiveBufferSizePredictor)}
     * will be called with the new predictor.  The default factory is
     * {@link AdaptiveReceiveBufferSizePredictorFactory}(64, 1024, 65536).
     */
    ReceiveBufferSizePredictorFactory getReceiveBufferSizePredictorFactory();

    /**
     * Sets the {@link ReceiveBufferSizePredictor} which creates a new
     * {@link ReceiveBufferSizePredictor} when a new channel is created and
     * no {@link ReceiveBufferSizePredictor} was set.  If no predictor was set
     * for the channel, {@link #setReceiveBufferSizePredictor(ReceiveBufferSizePredictor)}
     * will be called with the new predictor.  The default factory is
     * {@link AdaptiveReceiveBufferSizePredictorFactory}(64, 1024, 65536).
     */
    void setReceiveBufferSizePredictorFactory(ReceiveBufferSizePredictorFactory predictorFactory);
}