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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2015 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty.channel;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import org.asynchttpclient.AsyncHandler;
import org.asynchttpclient.AsyncHttpClientState;
import org.asynchttpclient.netty.SimpleChannelFutureListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

public class NettyChannelConnector {

  private static final Logger LOGGER = LoggerFactory.getLogger(NettyChannelConnector.class);

  private static final AtomicIntegerFieldUpdater I_UPDATER = AtomicIntegerFieldUpdater
          .newUpdater(NettyChannelConnector.class, "i");

  private final AsyncHandler asyncHandler;
  private final InetSocketAddress localAddress;
  private final List remoteAddresses;
  private final AsyncHttpClientState clientState;
  private volatile int i = 0;

  public NettyChannelConnector(InetAddress localAddress,
                               List remoteAddresses,
                               AsyncHandler asyncHandler,
                               AsyncHttpClientState clientState) {
    this.localAddress = localAddress != null ? new InetSocketAddress(localAddress, 0) : null;
    this.remoteAddresses = remoteAddresses;
    this.asyncHandler = asyncHandler;
    this.clientState = clientState;
  }

  private boolean pickNextRemoteAddress() {
    I_UPDATER.incrementAndGet(this);
    return i < remoteAddresses.size();
  }

  public void connect(final Bootstrap bootstrap, final NettyConnectListener connectListener) {
    final InetSocketAddress remoteAddress = remoteAddresses.get(i);

    try {
      asyncHandler.onTcpConnectAttempt(remoteAddress);
    } catch (Exception e) {
      LOGGER.error("onTcpConnectAttempt crashed", e);
      connectListener.onFailure(null, e);
      return;
    }

    try {
      connect0(bootstrap, connectListener, remoteAddress);
    } catch (RejectedExecutionException e) {
      if (clientState.isClosed()) {
        LOGGER.info("Connect crash but engine is shutting down");
      } else {
        connectListener.onFailure(null, e);
      }
    }
  }

  private void connect0(Bootstrap bootstrap, final NettyConnectListener connectListener, InetSocketAddress remoteAddress) {

    bootstrap.connect(remoteAddress, localAddress)
            .addListener(new SimpleChannelFutureListener() {
              @Override
              public void onSuccess(Channel channel) {
                try {
                  asyncHandler.onTcpConnectSuccess(remoteAddress, channel);
                } catch (Exception e) {
                  LOGGER.error("onTcpConnectSuccess crashed", e);
                  connectListener.onFailure(channel, e);
                  return;
                }
                connectListener.onSuccess(channel, remoteAddress);
              }

              @Override
              public void onFailure(Channel channel, Throwable t) {
                try {
                  asyncHandler.onTcpConnectFailure(remoteAddress, t);
                } catch (Exception e) {
                  LOGGER.error("onTcpConnectFailure crashed", e);
                  connectListener.onFailure(channel, e);
                  return;
                }
                boolean retry = pickNextRemoteAddress();
                if (retry) {
                  NettyChannelConnector.this.connect(bootstrap, connectListener);
                } else {
                  connectListener.onFailure(channel, t);
                }
              }
            });
  }
}