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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.
/*
* 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.socket.nio;
import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.StandardSocketOptions;
import java.nio.channels.DatagramChannel;
import java.util.Enumeration;
import java.util.Map;
import org.jboss.netty.channel.ChannelException;
import org.jboss.netty.channel.socket.DefaultDatagramChannelConfig;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
import org.jboss.netty.util.internal.ConversionUtil;
import org.jboss.netty.util.internal.DetectionUtil;
/**
* The default {@link NioSocketChannelConfig} implementation.
*/
class DefaultNioDatagramChannelConfig extends DefaultDatagramChannelConfig
implements NioDatagramChannelConfig {
private static final InternalLogger logger =
InternalLoggerFactory
.getInstance(DefaultNioDatagramChannelConfig.class);
private volatile int writeBufferHighWaterMark = 64 * 1024;
private volatile int writeBufferLowWaterMark = 32 * 1024;
private volatile int writeSpinCount = 16;
private final DatagramChannel channel;
DefaultNioDatagramChannelConfig(DatagramChannel channel) {
super(channel.socket());
this.channel = channel;
}
@Override
public void setOptions(Map options) {
super.setOptions(options);
if (getWriteBufferHighWaterMark() < getWriteBufferLowWaterMark()) {
// Recover the integrity of the configuration with a sensible value.
setWriteBufferLowWaterMark0(getWriteBufferHighWaterMark() >>> 1);
if (logger.isWarnEnabled()) {
// Notify the user about misconfiguration.
logger.warn("writeBufferLowWaterMark cannot be greater than "
+ "writeBufferHighWaterMark; setting to the half of the "
+ "writeBufferHighWaterMark.");
}
}
}
@Override
public boolean setOption(String key, Object value) {
if (super.setOption(key, value)) {
return true;
}
if ("writeBufferHighWaterMark".equals(key)) {
setWriteBufferHighWaterMark0(ConversionUtil.toInt(value));
} else if ("writeBufferLowWaterMark".equals(key)) {
setWriteBufferLowWaterMark0(ConversionUtil.toInt(value));
} else if ("writeSpinCount".equals(key)) {
setWriteSpinCount(ConversionUtil.toInt(value));
} else {
return false;
}
return true;
}
public int getWriteBufferHighWaterMark() {
return writeBufferHighWaterMark;
}
public void setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
if (writeBufferHighWaterMark < getWriteBufferLowWaterMark()) {
throw new IllegalArgumentException(
"writeBufferHighWaterMark cannot be less than " +
"writeBufferLowWaterMark (" +
getWriteBufferLowWaterMark() + "): " +
writeBufferHighWaterMark);
}
setWriteBufferHighWaterMark0(writeBufferHighWaterMark);
}
private void setWriteBufferHighWaterMark0(int writeBufferHighWaterMark) {
if (writeBufferHighWaterMark < 0) {
throw new IllegalArgumentException("writeBufferHighWaterMark: " +
writeBufferHighWaterMark);
}
this.writeBufferHighWaterMark = writeBufferHighWaterMark;
}
public int getWriteBufferLowWaterMark() {
return writeBufferLowWaterMark;
}
public void setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
if (writeBufferLowWaterMark > getWriteBufferHighWaterMark()) {
throw new IllegalArgumentException(
"writeBufferLowWaterMark cannot be greater than " +
"writeBufferHighWaterMark (" +
getWriteBufferHighWaterMark() + "): " +
writeBufferLowWaterMark);
}
setWriteBufferLowWaterMark0(writeBufferLowWaterMark);
}
private void setWriteBufferLowWaterMark0(int writeBufferLowWaterMark) {
if (writeBufferLowWaterMark < 0) {
throw new IllegalArgumentException("writeBufferLowWaterMark: " +
writeBufferLowWaterMark);
}
this.writeBufferLowWaterMark = writeBufferLowWaterMark;
}
public int getWriteSpinCount() {
return writeSpinCount;
}
public void setWriteSpinCount(int writeSpinCount) {
if (writeSpinCount <= 0) {
throw new IllegalArgumentException(
"writeSpinCount must be a positive integer.");
}
this.writeSpinCount = writeSpinCount;
}
@Override
public void setNetworkInterface(NetworkInterface networkInterface) {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
try {
channel.setOption(StandardSocketOptions.IP_MULTICAST_IF, networkInterface);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}
@Override
public NetworkInterface getNetworkInterface() {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
try {
return channel.getOption(StandardSocketOptions.IP_MULTICAST_IF);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}
@Override
public int getTimeToLive() {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
try {
return channel.getOption(StandardSocketOptions.IP_MULTICAST_TTL);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}
@Override
public void setTimeToLive(int ttl) {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
try {
channel.setOption(StandardSocketOptions.IP_MULTICAST_TTL, ttl);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}
@Override
public InetAddress getInterface() {
NetworkInterface inf = getNetworkInterface();
if (inf == null) {
return null;
} else {
Enumeration addresses = inf.getInetAddresses();
if (addresses.hasMoreElements()) {
return addresses.nextElement();
}
return null;
}
}
@Override
public void setInterface(InetAddress interfaceAddress) {
try {
setNetworkInterface(NetworkInterface.getByInetAddress(interfaceAddress));
} catch (SocketException e) {
throw new ChannelException(e);
}
}
@Override
public boolean isLoopbackModeDisabled() {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
try {
return channel.getOption(StandardSocketOptions.IP_MULTICAST_LOOP);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}
@Override
public void setLoopbackModeDisabled(boolean loopbackModeDisabled) {
if (DetectionUtil.javaVersion() < 7) {
throw new UnsupportedOperationException();
} else {
try {
channel.setOption(StandardSocketOptions.IP_MULTICAST_LOOP, loopbackModeDisabled);
} catch (IOException e) {
throw new ChannelException(e);
}
}
}
}