/*
* Copyright 2011 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.nio;
import static io.netty.channel.Channels.fireChannelBound;
import static io.netty.channel.Channels.fireChannelConnected;
import static io.netty.channel.Channels.fireExceptionCaught;
import static io.netty.channel.Channels.fireMessageReceived;
import static io.netty.channel.Channels.succeededFuture;
import io.netty.buffer.ChannelBuffer;
import io.netty.buffer.ChannelBufferFactory;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ReceiveBufferSizePredictor;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.concurrent.Executor;
class NioWorker extends AbstractNioWorker {
private final SocketReceiveBufferPool recvBufferPool = new SocketReceiveBufferPool();
NioWorker(Executor executor) {
super(executor);
}
@Override
protected boolean read(SelectionKey k) {
final SocketChannel ch = (SocketChannel) k.channel();
final NioSocketChannel channel = (NioSocketChannel) k.attachment();
final ReceiveBufferSizePredictor predictor =
channel.getConfig().getReceiveBufferSizePredictor();
final int predictedRecvBufSize = predictor.nextReceiveBufferSize();
int ret = 0;
int readBytes = 0;
boolean failure = true;
ByteBuffer bb = recvBufferPool.acquire(predictedRecvBufSize);
try {
while ((ret = ch.read(bb)) > 0) {
readBytes += ret;
if (!bb.hasRemaining()) {
break;
}
}
failure = false;
} catch (ClosedChannelException e) {
// Can happen, and does not need a user attention.
} catch (Throwable t) {
fireExceptionCaught(channel, t);
}
if (readBytes > 0) {
bb.flip();
final ChannelBufferFactory bufferFactory =
channel.getConfig().getBufferFactory();
final ChannelBuffer buffer = bufferFactory.getBuffer(readBytes);
buffer.setBytes(0, bb);
buffer.writerIndex(readBytes);
recvBufferPool.release(bb);
// Update the predictor.
predictor.previousReceiveBufferSize(readBytes);
// Fire the event.
fireMessageReceived(channel, buffer);
} else {
recvBufferPool.release(bb);
}
if (ret < 0 || failure) {
k.cancel(); // Some JDK implementations run into an infinite loop without this.
close(channel, succeededFuture(channel));
return false;
}
return true;
}
@Override
protected boolean scheduleWriteIfNecessary(final AbstractNioChannel<?> channel) {
final Thread currentThread = Thread.currentThread();
final Thread workerThread = thread;
if (currentThread != workerThread) {
if (channel.writeTaskInTaskQueue.compareAndSet(false, true)) {
boolean offered = writeTaskQueue.offer(channel.writeTask);
assert offered;
}
if (!(channel instanceof NioAcceptedSocketChannel) ||
((NioAcceptedSocketChannel) channel).bossThread != currentThread) {
final Selector workerSelector = selector;
if (workerSelector != null) {
if (wakenUp.compareAndSet(false, true)) {
workerSelector.wakeup();
}
}
} else {
// A write request can be made from an acceptor thread (boss)
// when a user attempted to write something in:
//
// * channelOpen()
// * channelBound()
// * channelConnected().
//
// In this case, there's no need to wake up the selector because
// the channel is not even registered yet at this moment.
}
return true;
}
return false;
}
@Override
protected Runnable createRegisterTask(AbstractNioChannel<?> channel, ChannelFuture future) {
boolean server = !(channel instanceof NioClientSocketChannel);
return new RegisterTask((NioSocketChannel) channel, future, server);
}
private final class RegisterTask implements Runnable {
private final NioSocketChannel channel;
private final ChannelFuture future;
private final boolean server;
RegisterTask(
NioSocketChannel channel, ChannelFuture future, boolean server) {
this.channel = channel;
this.future = future;
this.server = server;
}
@Override
public void run() {
SocketAddress localAddress = channel.getLocalAddress();
SocketAddress remoteAddress = channel.getRemoteAddress();
if (localAddress == null || remoteAddress == null) {
if (future != null) {
future.setFailure(new ClosedChannelException());
}
close(channel, succeededFuture(channel));
return;
}
try {
if (server) {
channel.channel.configureBlocking(false);
}
synchronized (channel.interestOpsLock) {
channel.channel.register(
selector, channel.getRawInterestOps(), channel);
}
if (future != null) {
channel.setConnected();
future.setSuccess();
}
} catch (IOException e) {
if (future != null) {
future.setFailure(e);
}
close(channel, succeededFuture(channel));
if (!(e instanceof ClosedChannelException)) {
throw new ChannelException(
"Failed to register a socket to the selector.", e);
}
}
if (server || !((NioClientSocketChannel) channel).boundManually) {
fireChannelBound(channel, localAddress);
}
fireChannelConnected(channel, remoteAddress);
}
}
}