/*
* 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.aio;
import io.netty.channel.AbstractChannel;
import io.netty.channel.Channel;
import io.netty.channel.ChannelPromise;
import io.netty.channel.ConnectTimeoutException;
import io.netty.channel.EventLoop;
import java.net.ConnectException;
import java.net.SocketAddress;
import java.nio.channels.AsynchronousChannel;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* Abstract base class for {@link Channel} implementations that use the new {@link AsynchronousChannel} which is part
* of NIO.2.
*/
public abstract class AbstractAioChannel extends AbstractChannel {
protected volatile AsynchronousChannel ch;
/**
* The future of the current connection attempt. If not null, subsequent
* connection attempts will fail.
*/
protected ChannelPromise connectPromise;
protected ScheduledFuture<?> connectTimeoutFuture;
private SocketAddress requestedRemoteAddress;
/**
* Creates a new instance.
*
* @param id
* the unique non-negative integer ID of this channel.
* Specify {@code null} to auto-generate a unique negative integer
* ID.
* @param parent
* the parent of this channel. {@code null} if there's no parent.
* @param ch
* the {@link AsynchronousChannel} which will handle the IO or {@code null} if not created yet.
*/
protected AbstractAioChannel(Channel parent, Integer id, AsynchronousChannel ch) {
super(parent, id);
this.ch = ch;
}
/**
* Return the underlying {@link AsynchronousChannel}. Be aware this should only be called after it was set as
* otherwise it will throw an {@link IllegalStateException}.
*/
protected AsynchronousChannel javaChannel() {
if (ch == null) {
throw new IllegalStateException("Try to access Channel before eventLoop was registered");
}
return ch;
}
@Override
public boolean isOpen() {
if (ch == null) {
return true;
}
return ch.isOpen();
}
@Override
protected boolean isCompatible(EventLoop loop) {
return loop instanceof AioEventLoop;
}
@Override
protected AbstractUnsafe newUnsafe() {
return new DefaultAioUnsafe();
}
protected final class DefaultAioUnsafe extends AbstractUnsafe {
@Override
public void connect(final SocketAddress remoteAddress,
final SocketAddress localAddress, final ChannelPromise promise) {
if (eventLoop().inEventLoop()) {
if (!ensureOpen(promise)) {
return;
}
try {
if (connectPromise != null) {
throw new IllegalStateException("connection attempt already made");
}
connectPromise = promise;
requestedRemoteAddress = remoteAddress;
doConnect(remoteAddress, localAddress, promise);
// Schedule connect timeout.
int connectTimeoutMillis = config().getConnectTimeoutMillis();
if (connectTimeoutMillis > 0) {
connectTimeoutFuture = eventLoop().schedule(new Runnable() {
@Override
public void run() {
ChannelPromise connectFuture = connectPromise;
ConnectTimeoutException cause =
new ConnectTimeoutException("connection timed out: " + remoteAddress);
if (connectFuture != null && connectFuture.tryFailure(cause)) {
close(voidFuture());
}
}
}, connectTimeoutMillis, TimeUnit.MILLISECONDS);
}
} catch (Throwable t) {
if (t instanceof ConnectException) {
Throwable newT = new ConnectException(t.getMessage() + ": " + remoteAddress);
newT.setStackTrace(t.getStackTrace());
t = newT;
}
promise.setFailure(t);
closeIfClosed();
}
} else {
eventLoop().execute(new Runnable() {
@Override
public void run() {
connect(remoteAddress, localAddress, promise);
}
});
}
}
public void connectFailed(Throwable t) {
if (t instanceof ConnectException) {
Throwable newT = new ConnectException(t.getMessage() + ": " + requestedRemoteAddress);
newT.setStackTrace(t.getStackTrace());
t = newT;
}
connectPromise.setFailure(t);
closeIfClosed();
}
public void connectSuccess() {
assert eventLoop().inEventLoop();
assert connectPromise != null;
try {
connectPromise.setSuccess();
pipeline().fireChannelActive();
} catch (Throwable t) {
connectPromise.setFailure(t);
closeIfClosed();
} finally {
connectTimeoutFuture.cancel(false);
connectPromise = null;
}
}
}
/**
* Connect to the remote peer using the given localAddress if one is specified or {@code null} otherwise.
*/
protected abstract void doConnect(SocketAddress remoteAddress,
SocketAddress localAddress, ChannelPromise connectPromise);
}