500 lines
16 KiB
Java
Executable File
500 lines
16 KiB
Java
Executable File
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel.socket.nio;
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import io.netty.buffer.BufType;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.MessageBuf;
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import io.netty.channel.ChannelException;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelMetadata;
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import io.netty.channel.ChannelPromise;
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import io.netty.channel.socket.DatagramChannelConfig;
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import io.netty.channel.socket.DatagramPacket;
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import io.netty.channel.socket.InternetProtocolFamily;
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import io.netty.util.internal.DetectionUtil;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.NetworkInterface;
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import java.net.SocketAddress;
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import java.net.SocketException;
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import java.nio.ByteBuffer;
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import java.nio.channels.DatagramChannel;
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import java.nio.channels.MembershipKey;
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import java.nio.channels.SelectionKey;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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/**
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* Provides an NIO based {@link io.netty.channel.socket.DatagramChannel} which can be used
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* to send and receive {@link DatagramPacket}'s.
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*/
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public final class NioDatagramChannel
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extends AbstractNioMessageChannel implements io.netty.channel.socket.DatagramChannel {
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private static final ChannelMetadata METADATA = new ChannelMetadata(BufType.MESSAGE, true);
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private final DatagramChannelConfig config;
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private final Map<InetAddress, List<MembershipKey>> memberships =
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new HashMap<InetAddress, List<MembershipKey>>();
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private static DatagramChannel newSocket() {
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try {
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return DatagramChannel.open();
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} catch (IOException e) {
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throw new ChannelException("Failed to open a socket.", e);
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}
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}
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private static DatagramChannel newSocket(InternetProtocolFamily ipFamily) {
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if (ipFamily == null) {
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return newSocket();
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}
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if (DetectionUtil.javaVersion() < 7) {
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throw new UnsupportedOperationException();
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}
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try {
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return DatagramChannel.open(ProtocolFamilyConverter.convert(ipFamily));
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} catch (IOException e) {
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throw new ChannelException("Failed to open a socket.", e);
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}
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}
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/**
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* Create a new instance which will use the Operation Systems default {@link InternetProtocolFamily}.
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*/
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public NioDatagramChannel() {
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this(newSocket());
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}
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/**
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* Create a new instance using the given {@link InternetProtocolFamily}. If {@code null} is used it will depend
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* on the Operation Systems default which will be chosen.
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*/
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public NioDatagramChannel(InternetProtocolFamily ipFamily) {
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this(newSocket(ipFamily));
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}
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/**
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* Create a new instance from the given {@link DatagramChannel}.
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*/
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public NioDatagramChannel(DatagramChannel socket) {
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this(null, socket);
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}
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/**
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* Create a new instance from the given {@link DatagramChannel}.
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*
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* @param id the id to use for this instance or {@code null} if a new one should be generated.
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* @param socket the {@link DatagramChannel} which will be used
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*/
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public NioDatagramChannel(Integer id, DatagramChannel socket) {
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super(null, id, socket, SelectionKey.OP_READ);
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config = new NioDatagramChannelConfig(this, socket);
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}
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@Override
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public ChannelMetadata metadata() {
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return METADATA;
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}
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@Override
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public DatagramChannelConfig config() {
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return config;
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}
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@Override
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public boolean isActive() {
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DatagramChannel ch = javaChannel();
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return ch.isOpen() && ch.socket().isBound();
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}
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@Override
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public boolean isConnected() {
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return javaChannel().isConnected();
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}
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@Override
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protected DatagramChannel javaChannel() {
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return (DatagramChannel) super.javaChannel();
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}
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@Override
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protected SocketAddress localAddress0() {
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return javaChannel().socket().getLocalSocketAddress();
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}
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@Override
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protected SocketAddress remoteAddress0() {
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return javaChannel().socket().getRemoteSocketAddress();
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}
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@Override
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protected void doBind(SocketAddress localAddress) throws Exception {
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javaChannel().socket().bind(localAddress);
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}
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@Override
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protected boolean doConnect(SocketAddress remoteAddress,
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SocketAddress localAddress) throws Exception {
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if (localAddress != null) {
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javaChannel().socket().bind(localAddress);
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}
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boolean success = false;
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try {
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javaChannel().connect(remoteAddress);
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success = true;
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return true;
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} finally {
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if (!success) {
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doClose();
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}
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}
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}
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@Override
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protected void doFinishConnect() throws Exception {
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throw new Error();
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}
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@Override
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protected void doDisconnect() throws Exception {
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javaChannel().disconnect();
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}
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@Override
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protected void doClose() throws Exception {
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javaChannel().close();
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}
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@Override
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protected int doReadMessages(MessageBuf<Object> buf) throws Exception {
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DatagramChannel ch = javaChannel();
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ByteBuf buffer = alloc().directBuffer(config().getReceivePacketSize());
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boolean free = true;
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try {
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ByteBuffer data = buffer.nioBuffer(buffer.writerIndex(), buffer.writableBytes());
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InetSocketAddress remoteAddress = (InetSocketAddress) ch.receive(data);
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if (remoteAddress == null) {
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return 0;
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}
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buf.add(new DatagramPacket(buffer.writerIndex(buffer.writerIndex() + data.remaining()), remoteAddress));
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free = false;
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return 1;
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} catch (Throwable cause) {
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if (cause instanceof Error) {
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throw (Error) cause;
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}
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if (cause instanceof RuntimeException) {
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throw (RuntimeException) cause;
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}
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if (cause instanceof Exception) {
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throw (Exception) cause;
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}
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throw new ChannelException(cause);
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} finally {
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if (free) {
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buffer.free();
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}
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}
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}
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@Override
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protected int doWriteMessages(MessageBuf<Object> buf, boolean lastSpin) throws Exception {
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DatagramPacket packet = (DatagramPacket) buf.peek();
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ByteBuf data = packet.data();
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int dataLen = data.readableBytes();
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ByteBuffer nioData;
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if (data.nioBufferCount() == 1) {
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nioData = data.nioBuffer();
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} else {
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nioData = ByteBuffer.allocate(dataLen);
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data.getBytes(data.readerIndex(), nioData);
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nioData.flip();
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}
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final int writtenBytes = javaChannel().send(nioData, packet.remoteAddress());
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final SelectionKey key = selectionKey();
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final int interestOps = key.interestOps();
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if (writtenBytes <= 0 && dataLen > 0) {
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// Did not write a packet.
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// 1) If 'lastSpin' is false, the caller will call this method again real soon.
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// - Do not update OP_WRITE.
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// 2) If 'lastSpin' is true, the caller will not retry.
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// - Set OP_WRITE so that the event loop calls flushForcibly() later.
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if (lastSpin) {
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if ((interestOps & SelectionKey.OP_WRITE) == 0) {
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key.interestOps(interestOps | SelectionKey.OP_WRITE);
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}
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}
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return 0;
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}
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// Wrote a packet.
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buf.remove();
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// packet was written free up buffer
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packet.free();
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if (buf.isEmpty()) {
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// Wrote the outbound buffer completely - clear OP_WRITE.
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if ((interestOps & SelectionKey.OP_WRITE) != 0) {
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key.interestOps(interestOps & ~SelectionKey.OP_WRITE);
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}
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}
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return 1;
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}
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@Override
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public ChannelFuture joinGroup(InetAddress multicastAddress) {
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return joinGroup(multicastAddress, newPromise());
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}
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@Override
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public ChannelFuture joinGroup(InetAddress multicastAddress, ChannelPromise promise) {
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try {
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return joinGroup(
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multicastAddress,
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NetworkInterface.getByInetAddress(localAddress().getAddress()),
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null, promise);
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} catch (SocketException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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public ChannelFuture joinGroup(
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InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
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return joinGroup(multicastAddress, networkInterface, newPromise());
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}
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@Override
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public ChannelFuture joinGroup(
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InetSocketAddress multicastAddress, NetworkInterface networkInterface,
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ChannelPromise promise) {
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return joinGroup(multicastAddress.getAddress(), networkInterface, null, promise);
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}
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@Override
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public ChannelFuture joinGroup(
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InetAddress multicastAddress, NetworkInterface networkInterface, InetAddress source) {
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return joinGroup(multicastAddress, networkInterface, source, newPromise());
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}
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@Override
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public ChannelFuture joinGroup(
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InetAddress multicastAddress, NetworkInterface networkInterface,
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InetAddress source, ChannelPromise promise) {
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if (DetectionUtil.javaVersion() >= 7) {
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if (multicastAddress == null) {
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throw new NullPointerException("multicastAddress");
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}
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if (networkInterface == null) {
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throw new NullPointerException("networkInterface");
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}
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try {
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MembershipKey key;
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if (source == null) {
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key = javaChannel().join(multicastAddress, networkInterface);
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} else {
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key = javaChannel().join(multicastAddress, networkInterface, source);
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}
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synchronized (this) {
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List<MembershipKey> keys = memberships.get(multicastAddress);
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if (keys == null) {
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keys = new ArrayList<MembershipKey>();
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memberships.put(multicastAddress, keys);
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}
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keys.add(key);
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}
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promise.setSuccess();
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} catch (Throwable e) {
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promise.setFailure(e);
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}
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} else {
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throw new UnsupportedOperationException();
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}
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return promise;
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}
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@Override
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public ChannelFuture leaveGroup(InetAddress multicastAddress) {
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return leaveGroup(multicastAddress, newPromise());
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}
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@Override
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public ChannelFuture leaveGroup(InetAddress multicastAddress, ChannelPromise promise) {
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try {
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return leaveGroup(
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multicastAddress, NetworkInterface.getByInetAddress(localAddress().getAddress()), null, promise);
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} catch (SocketException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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@Override
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public ChannelFuture leaveGroup(
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InetSocketAddress multicastAddress, NetworkInterface networkInterface) {
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return leaveGroup(multicastAddress, networkInterface, newPromise());
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}
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@Override
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public ChannelFuture leaveGroup(
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InetSocketAddress multicastAddress,
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NetworkInterface networkInterface, ChannelPromise promise) {
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return leaveGroup(multicastAddress.getAddress(), networkInterface, null, promise);
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}
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@Override
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public ChannelFuture leaveGroup(
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InetAddress multicastAddress, NetworkInterface networkInterface, InetAddress source) {
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return leaveGroup(multicastAddress, networkInterface, source, newPromise());
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}
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@Override
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public ChannelFuture leaveGroup(
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InetAddress multicastAddress, NetworkInterface networkInterface, InetAddress source,
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ChannelPromise promise) {
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if (DetectionUtil.javaVersion() < 7) {
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throw new UnsupportedOperationException();
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}
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if (multicastAddress == null) {
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throw new NullPointerException("multicastAddress");
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}
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if (networkInterface == null) {
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throw new NullPointerException("networkInterface");
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}
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synchronized (this) {
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if (memberships != null) {
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List<MembershipKey> keys = memberships.get(multicastAddress);
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if (keys != null) {
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Iterator<MembershipKey> keyIt = keys.iterator();
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while (keyIt.hasNext()) {
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MembershipKey key = keyIt.next();
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if (networkInterface.equals(key.networkInterface())) {
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if (source == null && key.sourceAddress() == null ||
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source != null && source.equals(key.sourceAddress())) {
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key.drop();
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keyIt.remove();
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}
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}
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}
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if (keys.isEmpty()) {
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memberships.remove(multicastAddress);
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}
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}
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}
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}
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promise.setSuccess();
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return promise;
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}
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/**
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* Block the given sourceToBlock address for the given multicastAddress on the given networkInterface
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*/
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@Override
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public ChannelFuture block(
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InetAddress multicastAddress, NetworkInterface networkInterface,
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InetAddress sourceToBlock) {
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return block(multicastAddress, networkInterface, sourceToBlock, newPromise());
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}
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/**
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* Block the given sourceToBlock address for the given multicastAddress on the given networkInterface
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*/
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@Override
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public ChannelFuture block(
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InetAddress multicastAddress, NetworkInterface networkInterface,
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InetAddress sourceToBlock, ChannelPromise promise) {
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if (DetectionUtil.javaVersion() < 7) {
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throw new UnsupportedOperationException();
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} else {
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if (multicastAddress == null) {
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throw new NullPointerException("multicastAddress");
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}
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if (sourceToBlock == null) {
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throw new NullPointerException("sourceToBlock");
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}
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if (networkInterface == null) {
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throw new NullPointerException("networkInterface");
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}
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synchronized (this) {
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if (memberships != null) {
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List<MembershipKey> keys = memberships.get(multicastAddress);
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for (MembershipKey key: keys) {
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if (networkInterface.equals(key.networkInterface())) {
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try {
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key.block(sourceToBlock);
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} catch (IOException e) {
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promise.setFailure(e);
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}
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}
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}
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}
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}
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promise.setSuccess();
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return promise;
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}
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}
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/**
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* Block the given sourceToBlock address for the given multicastAddress
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*
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*/
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@Override
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public ChannelFuture block(InetAddress multicastAddress, InetAddress sourceToBlock) {
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return block(multicastAddress, sourceToBlock, newPromise());
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}
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/**
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* Block the given sourceToBlock address for the given multicastAddress
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*
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*/
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@Override
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public ChannelFuture block(
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InetAddress multicastAddress, InetAddress sourceToBlock, ChannelPromise promise) {
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try {
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return block(
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multicastAddress,
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NetworkInterface.getByInetAddress(localAddress().getAddress()),
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sourceToBlock, promise);
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} catch (SocketException e) {
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promise.setFailure(e);
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}
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return promise;
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}
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}
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