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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 io.netty.channel.socket.aio;
import io.netty.buffer.BufType;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelFlushPromiseNotifier;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelMetadata;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.FileRegion;
import io.netty.channel.aio.AbstractAioChannel;
import io.netty.channel.aio.AioCompletionHandler;
import io.netty.channel.aio.AioEventLoopGroup;
import io.netty.channel.socket.ChannelInputShutdownEvent;
import io.netty.channel.socket.ServerSocketChannel;
import io.netty.channel.socket.SocketChannel;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousChannelGroup;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.CompletionHandler;
import java.nio.channels.InterruptedByTimeoutException;
import java.nio.channels.WritableByteChannel;
import java.util.concurrent.TimeUnit;
/**
* {@link SocketChannel} implementation which uses NIO2.
*
* NIO2 is only supported on Java 7+.
*/
public class AioSocketChannel extends AbstractAioChannel implements SocketChannel {
private static final ChannelMetadata METADATA = new ChannelMetadata(BufType.BYTE, false);
private static final CompletionHandler CONNECT_HANDLER = new ConnectHandler();
private static final CompletionHandler WRITE_HANDLER = new WriteHandler();
private static final CompletionHandler READ_HANDLER = new ReadHandler();
private static final CompletionHandler GATHERING_WRITE_HANDLER = new WriteHandler();
private static final CompletionHandler SCATTERING_READ_HANDLER = new ReadHandler();
private static AsynchronousSocketChannel newSocket(AsynchronousChannelGroup group) {
try {
return AsynchronousSocketChannel.open(group);
} catch (IOException e) {
throw new ChannelException("Failed to open a socket.", e);
}
}
private final DefaultAioSocketChannelConfig config;
private volatile boolean inputShutdown;
private volatile boolean outputShutdown;
private boolean readInProgress;
private boolean inDoBeginRead;
private boolean readAgain;
private boolean writeInProgress;
private boolean inDoFlushByteBuffer;
/**
* Create a new instance which has not yet attached an {@link AsynchronousSocketChannel}. The
* {@link AsynchronousSocketChannel} will be attached after it was this instance was registered to an
* {@link EventLoop}.
*/
public AioSocketChannel() {
this(null, null, null);
}
/**
* Create a new instance from the given {@link AsynchronousSocketChannel}.
*
* @param parent
* the parent of this channel. {@code null} if there's no parent.
* @param id
* the unique non-negative integer ID of this channel.
* Specify {@code null} to auto-generate a unique negative integer
* ID.
* @param ch
* the {@link AsynchronousSocketChannel} which is used by this instance
*/
AioSocketChannel(
AioServerSocketChannel parent, Integer id, AsynchronousSocketChannel ch) {
super(parent, id, ch);
config = new DefaultAioSocketChannelConfig(this, ch);
}
@Override
public InetSocketAddress localAddress() {
return (InetSocketAddress) super.localAddress();
}
@Override
public InetSocketAddress remoteAddress() {
return (InetSocketAddress) super.remoteAddress();
}
@Override
public ServerSocketChannel parent() {
return (ServerSocketChannel) super.parent();
}
@Override
public boolean isActive() {
return ch != null && javaChannel().isOpen() && remoteAddress0() != null;
}
@Override
protected AsynchronousSocketChannel javaChannel() {
return (AsynchronousSocketChannel) super.javaChannel();
}
@Override
public ChannelMetadata metadata() {
return METADATA;
}
@Override
public boolean isInputShutdown() {
return inputShutdown;
}
@Override
public boolean isOutputShutdown() {
return outputShutdown;
}
@Override
public ChannelFuture shutdownOutput() {
return shutdownOutput(newPromise());
}
@Override
public ChannelFuture shutdownOutput(final ChannelPromise promise) {
EventLoop loop = eventLoop();
if (loop.inEventLoop()) {
try {
javaChannel().shutdownOutput();
outputShutdown = true;
promise.setSuccess();
} catch (Throwable t) {
promise.setFailure(t);
}
} else {
loop.execute(new Runnable() {
@Override
public void run() {
shutdownOutput(promise);
}
});
}
return promise;
}
@Override
protected void doConnect(SocketAddress remoteAddress, SocketAddress localAddress, final ChannelPromise promise) {
if (localAddress != null) {
try {
javaChannel().bind(localAddress);
} catch (IOException e) {
promise.setFailure(e);
return;
}
}
javaChannel().connect(remoteAddress, this, CONNECT_HANDLER);
}
@Override
protected InetSocketAddress localAddress0() {
if (ch == null) {
return null;
}
try {
return (InetSocketAddress) javaChannel().getLocalAddress();
} catch (IOException e) {
return null;
}
}
@Override
protected InetSocketAddress remoteAddress0() {
if (ch == null) {
return null;
}
try {
return (InetSocketAddress) javaChannel().getRemoteAddress();
} catch (IOException e) {
return null;
}
}
@Override
protected Runnable doRegister() throws Exception {
super.doRegister();
if (ch == null) {
ch = newSocket(((AioEventLoopGroup) eventLoop().parent()).channelGroup());
config.assign(javaChannel());
}
return null;
}
@Override
protected void doBind(SocketAddress localAddress) throws Exception {
javaChannel().bind(localAddress);
}
@Override
protected void doDisconnect() throws Exception {
doClose();
}
@Override
protected void doClose() throws Exception {
javaChannel().close();
inputShutdown = true;
outputShutdown = true;
}
@Override
protected boolean isFlushPending() {
return false;
}
@Override
protected void doFlushByteBuffer(ByteBuf buf) throws Exception {
if (inDoFlushByteBuffer || writeInProgress) {
return;
}
inDoFlushByteBuffer = true;
try {
if (buf.isReadable()) {
for (;;) {
if (buf.refCnt() == 0) {
break;
}
// Ensure the readerIndex of the buffer is 0 before beginning an async write.
// Otherwise, JDK can write into a wrong region of the buffer when a handler calls
// discardReadBytes() later, modifying the readerIndex and the writerIndex unexpectedly.
buf.discardReadBytes();
writeInProgress = true;
if (buf.nioBufferCount() == 1) {
javaChannel().write(
buf.nioBuffer(), config.getWriteTimeout(), TimeUnit.MILLISECONDS, this, WRITE_HANDLER);
} else {
ByteBuffer[] buffers = buf.nioBuffers(buf.readerIndex(), buf.readableBytes());
if (buffers.length == 1) {
javaChannel().write(
buffers[0], config.getWriteTimeout(), TimeUnit.MILLISECONDS, this, WRITE_HANDLER);
} else {
javaChannel().write(
buffers, 0, buffers.length, config.getWriteTimeout(), TimeUnit.MILLISECONDS,
this, GATHERING_WRITE_HANDLER);
}
}
if (writeInProgress) {
// JDK decided to write data (or notify handler) later.
buf.suspendIntermediaryDeallocations();
break;
}
// JDK performed the write operation immediately and notified the handler.
// We know this because we set asyncWriteInProgress to false in the handler.
if (!buf.isReadable()) {
// There's nothing left in the buffer. No need to retry writing.
break;
}
// There's more to write. Continue the loop.
}
} else {
flushFutureNotifier.notifyFlushFutures();
}
} finally {
inDoFlushByteBuffer = false;
}
}
@Override
protected void doFlushFileRegion(FileRegion region, ChannelPromise promise) throws Exception {
region.transferTo(new WritableByteChannelAdapter(region, promise), 0);
}
@Override
protected void doBeginRead() {
if (inDoBeginRead) {
readAgain = true;
return;
}
if (readInProgress || inputShutdown) {
return;
}
inDoBeginRead = true;
try {
for (;;) {
if (inputShutdown) {
break;
}
ByteBuf byteBuf = pipeline().inboundByteBuffer();
expandReadBuffer(byteBuf);
readInProgress = true;
if (byteBuf.nioBufferCount() == 1) {
// Get a ByteBuffer view on the ByteBuf
ByteBuffer buffer = byteBuf.nioBuffer(byteBuf.writerIndex(), byteBuf.writableBytes());
javaChannel().read(
buffer, config.getReadTimeout(), TimeUnit.MILLISECONDS, this, READ_HANDLER);
} else {
ByteBuffer[] buffers = byteBuf.nioBuffers(byteBuf.writerIndex(), byteBuf.writableBytes());
if (buffers.length == 1) {
javaChannel().read(
buffers[0], config.getReadTimeout(), TimeUnit.MILLISECONDS, this, READ_HANDLER);
} else {
javaChannel().read(
buffers, 0, buffers.length, config.getReadTimeout(), TimeUnit.MILLISECONDS,
this, SCATTERING_READ_HANDLER);
}
}
if (readInProgress) {
// JDK decided to read data (or notify handler) later.
break;
}
if (readAgain) {
// User requested the read operation.
readAgain = false;
continue;
}
break;
}
} finally {
inDoBeginRead = false;
}
}
private static final class WriteHandler extends AioCompletionHandler {
@Override
protected void completed0(T result, AioSocketChannel channel) {
channel.writeInProgress = false;
ByteBuf buf = channel.unsafe().directOutboundContext().outboundByteBuffer();
if (buf.refCnt() == 0) {
return;
}
buf.resumeIntermediaryDeallocations();
int writtenBytes = result.intValue();
if (writtenBytes > 0) {
// Update the readerIndex with the amount of read bytes
buf.readerIndex(buf.readerIndex() + writtenBytes);
}
if (channel.inDoFlushByteBuffer) {
// JDK performed the write operation immediately and notified this handler immediately.
// doFlushByteBuffer() will do subsequent write operations if necessary for us.
return;
}
// Update the write counter and notify flush futures only when the handler is called outside of
// unsafe().flushNow() because flushNow() will do that for us.
ChannelFlushPromiseNotifier notifier = channel.flushFutureNotifier;
notifier.increaseWriteCounter(writtenBytes);
notifier.notifyFlushFutures();
// Stop flushing if disconnected.
if (!channel.isActive()) {
return;
}
if (buf.isReadable()) {
channel.unsafe().flushNow();
}
}
@Override
protected void failed0(Throwable cause, AioSocketChannel channel) {
channel.writeInProgress = false;
channel.flushFutureNotifier.notifyFlushFutures(cause);
// Check if the exception was raised because of an InterruptedByTimeoutException which means that the
// write timeout was hit. In that case we should close the channel as it may be unusable anyway.
//
// See http://openjdk.java.net/projects/nio/javadoc/java/nio/channels/AsynchronousSocketChannel.html
if (cause instanceof InterruptedByTimeoutException) {
channel.unsafe().close(channel.unsafe().voidFuture());
}
}
}
private static final class ReadHandler extends AioCompletionHandler {
@Override
protected void completed0(T result, AioSocketChannel channel) {
channel.readInProgress = false;
if (channel.inputShutdown) {
// Channel has been closed during read. Because the inbound buffer has been deallocated already,
// there's no way to let a user handler access it unfortunately.
return;
}
final ChannelPipeline pipeline = channel.pipeline();
final ByteBuf byteBuf = pipeline.inboundByteBuffer();
boolean closed = false;
boolean read = false;
boolean firedChannelReadSuspended = false;
try {
int localReadAmount = result.intValue();
if (localReadAmount > 0) {
// Set the writerIndex of the buffer correctly to the
// current writerIndex + read amount of bytes.
//
// This is needed as the ByteBuffer and the ByteBuf does not share
// each others index
byteBuf.writerIndex(byteBuf.writerIndex() + localReadAmount);
read = true;
} else if (localReadAmount < 0) {
closed = true;
}
} catch (Throwable t) {
if (read) {
read = false;
pipeline.fireInboundBufferUpdated();
}
if (!closed && channel.isOpen()) {
firedChannelReadSuspended = true;
pipeline.fireChannelReadSuspended();
}
pipeline.fireExceptionCaught(t);
} finally {
if (read) {
pipeline.fireInboundBufferUpdated();
}
// Double check because fireInboundBufferUpdated() might have triggered the closure by a user handler.
if (closed || !channel.isOpen()) {
channel.inputShutdown = true;
if (channel.isOpen()) {
if (channel.config().isAllowHalfClosure()) {
pipeline.fireUserEventTriggered(ChannelInputShutdownEvent.INSTANCE);
} else {
channel.unsafe().close(channel.unsafe().voidFuture());
}
}
} else if (!firedChannelReadSuspended) {
pipeline.fireChannelReadSuspended();
}
}
}
@Override
protected void failed0(Throwable t, AioSocketChannel channel) {
channel.readInProgress = false;
if (t instanceof ClosedChannelException) {
channel.inputShutdown = true;
return;
}
channel.pipeline().fireExceptionCaught(t);
// Check if the exception was raised because of an InterruptedByTimeoutException which means that the
// write timeout was hit. In that case we should close the channel as it may be unusable anyway.
//
// See http://openjdk.java.net/projects/nio/javadoc/java/nio/channels/AsynchronousSocketChannel.html
if (t instanceof IOException || t instanceof InterruptedByTimeoutException) {
channel.unsafe().close(channel.unsafe().voidFuture());
}
}
}
private static final class ConnectHandler extends AioCompletionHandler {
@Override
protected void completed0(Void result, AioSocketChannel channel) {
((DefaultAioUnsafe) channel.unsafe()).connectSuccess();
channel.pipeline().fireChannelActive();
}
@Override
protected void failed0(Throwable exc, AioSocketChannel channel) {
((DefaultAioUnsafe) channel.unsafe()).connectFailed(exc);
}
}
@Override
public AioSocketChannelConfig config() {
return config;
}
private final class WritableByteChannelAdapter implements WritableByteChannel {
private final FileRegion region;
private final ChannelPromise promise;
private long written;
public WritableByteChannelAdapter(FileRegion region, ChannelPromise promise) {
this.region = region;
this.promise = promise;
}
@Override
public int write(final ByteBuffer src) {
javaChannel().write(src, AioSocketChannel.this, new AioCompletionHandler() {
@Override
public void completed0(Integer result, Channel attachment) {
try {
if (result == 0) {
javaChannel().write(src, AioSocketChannel.this, this);
return;
}
if (result == -1) {
checkEOF(region, written);
promise.setSuccess();
return;
}
written += result;
if (written >= region.count()) {
region.release();
promise.setSuccess();
return;
}
if (src.hasRemaining()) {
javaChannel().write(src, AioSocketChannel.this, this);
} else {
region.transferTo(WritableByteChannelAdapter.this, written);
}
} catch (Throwable cause) {
region.release();
promise.setFailure(cause);
}
}
@Override
public void failed0(Throwable exc, Channel attachment) {
region.release();
promise.setFailure(exc);
}
});
return 0;
}
@Override
public boolean isOpen() {
return javaChannel().isOpen();
}
@Override
public void close() throws IOException {
javaChannel().close();
}
}
}
