/*
* 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.bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.resolver.DefaultNameResolverGroup;
import io.netty.resolver.NameResolver;
import io.netty.resolver.NameResolverGroup;
import io.netty.util.AttributeKey;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.Map;
import java.util.Map.Entry;
/**
* A {@link Bootstrap} that makes it easy to bootstrap a {@link Channel} to use
* for clients.
*
* <p>The {@link #bind()} methods are useful in combination with connectionless transports such as datagram (UDP).
* For regular TCP connections, please use the provided {@link #connect()} methods.</p>
*/
public class Bootstrap extends AbstractBootstrap<Bootstrap, Channel> {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(Bootstrap.class);
private static final NameResolverGroup<?> DEFAULT_RESOLVER = DefaultNameResolverGroup.INSTANCE;
@SuppressWarnings("unchecked")
private volatile NameResolverGroup<SocketAddress> resolver = (NameResolverGroup<SocketAddress>) DEFAULT_RESOLVER;
private volatile SocketAddress remoteAddress;
public Bootstrap() { }
private Bootstrap(Bootstrap bootstrap) {
super(bootstrap);
remoteAddress = bootstrap.remoteAddress;
}
/**
* Sets the {@link NameResolver} which will resolve the address of the unresolved named address.
*/
@SuppressWarnings("unchecked")
public Bootstrap resolver(NameResolverGroup<?> resolver) {
if (resolver == null) {
throw new NullPointerException("resolver");
}
this.resolver = (NameResolverGroup<SocketAddress>) resolver;
return this;
}
/**
* The {@link SocketAddress} to connect to once the {@link #connect()} method
* is called.
*/
public Bootstrap remoteAddress(SocketAddress remoteAddress) {
this.remoteAddress = remoteAddress;
return this;
}
/**
* @see {@link #remoteAddress(SocketAddress)}
*/
public Bootstrap remoteAddress(String inetHost, int inetPort) {
remoteAddress = InetSocketAddress.createUnresolved(inetHost, inetPort);
return this;
}
/**
* @see {@link #remoteAddress(SocketAddress)}
*/
public Bootstrap remoteAddress(InetAddress inetHost, int inetPort) {
remoteAddress = new InetSocketAddress(inetHost, inetPort);
return this;
}
/**
* Connect a {@link Channel} to the remote peer.
*/
public ChannelFuture connect() {
validate();
SocketAddress remoteAddress = this.remoteAddress;
if (remoteAddress == null) {
throw new IllegalStateException("remoteAddress not set");
}
return doResolveAndConnect(remoteAddress, localAddress());
}
/**
* Connect a {@link Channel} to the remote peer.
*/
public ChannelFuture connect(String inetHost, int inetPort) {
return connect(InetSocketAddress.createUnresolved(inetHost, inetPort));
}
/**
* Connect a {@link Channel} to the remote peer.
*/
public ChannelFuture connect(InetAddress inetHost, int inetPort) {
return connect(new InetSocketAddress(inetHost, inetPort));
}
/**
* Connect a {@link Channel} to the remote peer.
*/
public ChannelFuture connect(SocketAddress remoteAddress) {
if (remoteAddress == null) {
throw new NullPointerException("remoteAddress");
}
validate();
return doResolveAndConnect(remoteAddress, localAddress());
}
/**
* Connect a {@link Channel} to the remote peer.
*/
public ChannelFuture connect(SocketAddress remoteAddress, SocketAddress localAddress) {
if (remoteAddress == null) {
throw new NullPointerException("remoteAddress");
}
validate();
return doResolveAndConnect(remoteAddress, localAddress);
}
/**
* @see {@link #connect()}
*/
private ChannelFuture doResolveAndConnect(SocketAddress remoteAddress, final SocketAddress localAddress) {
final ChannelFuture regFuture = initAndRegister();
if (regFuture.cause() != null) {
return regFuture;
}
final Channel channel = regFuture.channel();
final EventLoop eventLoop = channel.eventLoop();
final NameResolver<SocketAddress> resolver = this.resolver.getResolver(eventLoop);
if (!resolver.isSupported(remoteAddress) || resolver.isResolved(remoteAddress)) {
// Resolver has no idea about what to do with the specified remote address or it's resolved already.
return doConnect(remoteAddress, localAddress, regFuture, channel.newPromise());
}
final Future<SocketAddress> resolveFuture = resolver.resolve(remoteAddress);
final Throwable resolveFailureCause = resolveFuture.cause();
if (resolveFailureCause != null) {
// Failed to resolve immediately
channel.close();
return channel.newFailedFuture(resolveFailureCause);
}
if (resolveFuture.isDone()) {
// Succeeded to resolve immediately; cached? (or did a blocking lookup)
return doConnect(resolveFuture.getNow(), localAddress, regFuture, channel.newPromise());
}
// Wait until the name resolution is finished.
final ChannelPromise connectPromise = channel.newPromise();
resolveFuture.addListener(new FutureListener<SocketAddress>() {
@Override
public void operationComplete(Future<SocketAddress> future) throws Exception {
if (future.cause() != null) {
channel.close();
connectPromise.setFailure(future.cause());
} else {
doConnect(future.getNow(), localAddress, regFuture, connectPromise);
}
}
});
return connectPromise;
}
private static ChannelFuture doConnect(
final SocketAddress remoteAddress, final SocketAddress localAddress,
final ChannelFuture regFuture, final ChannelPromise connectPromise) {
if (regFuture.isDone()) {
doConnect0(remoteAddress, localAddress, regFuture, connectPromise);
} else {
regFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
doConnect0(remoteAddress, localAddress, regFuture, connectPromise);
}
});
}
return connectPromise;
}
private static void doConnect0(
final SocketAddress remoteAddress, final SocketAddress localAddress, final ChannelFuture regFuture,
final ChannelPromise connectPromise) {
// This method is invoked before channelRegistered() is triggered. Give user handlers a chance to set up
// the pipeline in its channelRegistered() implementation.
final Channel channel = connectPromise.channel();
channel.eventLoop().execute(new Runnable() {
@Override
public void run() {
if (regFuture.isSuccess()) {
if (localAddress == null) {
channel.connect(remoteAddress, connectPromise);
} else {
channel.connect(remoteAddress, localAddress, connectPromise);
}
connectPromise.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
} else {
connectPromise.setFailure(regFuture.cause());
}
}
});
}
@Override
@SuppressWarnings("unchecked")
void init(Channel channel) throws Exception {
ChannelPipeline p = channel.pipeline();
p.addLast(handler());
final Map<ChannelOption<?>, Object> options = options();
synchronized (options) {
for (Entry<ChannelOption<?>, Object> e: options.entrySet()) {
try {
if (!channel.config().setOption((ChannelOption<Object>) e.getKey(), e.getValue())) {
logger.warn("Unknown channel option: " + e);
}
} catch (Throwable t) {
logger.warn("Failed to set a channel option: " + channel, t);
}
}
}
final Map<AttributeKey<?>, Object> attrs = attrs();
synchronized (attrs) {
for (Entry<AttributeKey<?>, Object> e: attrs.entrySet()) {
channel.attr((AttributeKey<Object>) e.getKey()).set(e.getValue());
}
}
}
@Override
public Bootstrap validate() {
super.validate();
if (handler() == null) {
throw new IllegalStateException("handler not set");
}
return this;
}
@Override
@SuppressWarnings("CloneDoesntCallSuperClone")
public Bootstrap clone() {
return new Bootstrap(this);
}
@Override
public String toString() {
if (remoteAddress == null) {
return super.toString();
}
StringBuilder buf = new StringBuilder(super.toString());
buf.setLength(buf.length() - 1);
buf.append(", remoteAddress: ");
buf.append(remoteAddress);
buf.append(')');
return buf.toString();
}
}