/*
* 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.*;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicInteger;
import io.netty.channel.AbstractChannelSink;
import io.netty.channel.ChannelEvent;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelState;
import io.netty.channel.ChannelStateEvent;
import io.netty.channel.MessageEvent;
/**
* Receives downstream events from a {@link ChannelPipeline}. It contains
* an array of I/O workers.
*/
class NioDatagramPipelineSink extends AbstractChannelSink {
private final NioDatagramWorker[] workers;
private final AtomicInteger workerIndex = new AtomicInteger();
/**
* Creates a new {@link NioDatagramPipelineSink} with a the number of {@link NioDatagramWorker}s specified in workerCount.
* The {@link NioDatagramWorker}s take care of reading and writing for the {@link NioDatagramChannel}.
*
* @param workerExecutor
* the {@link Executor} that will run the {@link NioDatagramWorker}s
* for this sink
* @param workerCount
* the number of {@link NioDatagramWorker}s for this sink
*/
NioDatagramPipelineSink(final Executor workerExecutor, final int workerCount) {
workers = new NioDatagramWorker[workerCount];
for (int i = 0; i < workers.length; i ++) {
workers[i] = new NioDatagramWorker(workerExecutor);
}
}
/**
* Handle downstream event.
*
* @param pipeline the {@link ChannelPipeline} that passes down the
* downstream event.
* @param e The downstream event.
*/
@Override
public void eventSunk(final ChannelPipeline pipeline, final ChannelEvent e)
throws Exception {
final NioDatagramChannel channel = (NioDatagramChannel) e.getChannel();
final ChannelFuture future = e.getFuture();
if (e instanceof ChannelStateEvent) {
final ChannelStateEvent stateEvent = (ChannelStateEvent) e;
final ChannelState state = stateEvent.getState();
final Object value = stateEvent.getValue();
switch (state) {
case OPEN:
if (Boolean.FALSE.equals(value)) {
channel.worker.close(channel, future);
}
break;
case BOUND:
if (value != null) {
bind(channel, future, (InetSocketAddress) value);
} else {
channel.worker.close(channel, future);
}
break;
case CONNECTED:
if (value != null) {
connect(channel, future, (InetSocketAddress) value);
} else {
NioDatagramWorker.disconnect(channel, future);
}
break;
case INTEREST_OPS:
channel.worker.setInterestOps(channel, future, ((Integer) value).intValue());
break;
}
} else if (e instanceof MessageEvent) {
final MessageEvent event = (MessageEvent) e;
final boolean offered = channel.writeBufferQueue.offer(event);
assert offered;
channel.worker.writeFromUserCode(channel);
}
}
private void close(NioDatagramChannel channel, ChannelFuture future) {
try {
channel.getDatagramChannel().socket().close();
if (channel.setClosed()) {
future.setSuccess();
if (channel.isBound()) {
fireChannelUnbound(channel);
}
fireChannelClosed(channel);
} else {
future.setSuccess();
}
} catch (final Throwable t) {
future.setFailure(t);
fireExceptionCaught(channel, t);
}
}
/**
* Will bind the DatagramSocket to the passed-in address.
* Every call bind will spawn a new thread using the that basically in turn
*/
private void bind(final NioDatagramChannel channel,
final ChannelFuture future, final InetSocketAddress address) {
boolean bound = false;
boolean started = false;
try {
// First bind the DatagramSocket the specified port.
channel.getDatagramChannel().socket().bind(address);
bound = true;
future.setSuccess();
fireChannelBound(channel, address);
channel.worker.register(channel, null);
started = true;
} catch (final Throwable t) {
future.setFailure(t);
fireExceptionCaught(channel, t);
} finally {
if (!started && bound) {
close(channel, future);
}
}
}
private void connect(
NioDatagramChannel channel, ChannelFuture future,
SocketAddress remoteAddress) {
boolean bound = channel.isBound();
boolean connected = false;
boolean workerStarted = false;
future.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
// Clear the cached address so that the next getRemoteAddress() call
// updates the cache.
channel.remoteAddress = null;
try {
channel.getDatagramChannel().connect(remoteAddress);
connected = true;
// Fire events.
future.setSuccess();
if (!bound) {
fireChannelBound(channel, channel.getLocalAddress());
}
fireChannelConnected(channel, channel.getRemoteAddress());
if (!bound) {
channel.worker.register(channel, future);
}
workerStarted = true;
} catch (Throwable t) {
future.setFailure(t);
fireExceptionCaught(channel, t);
} finally {
if (connected && !workerStarted) {
channel.worker.close(channel, future);
}
}
}
NioDatagramWorker nextWorker() {
return workers[Math.abs(workerIndex.getAndIncrement() % workers.length)];
}
}