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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2017 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.ws;

import io.netty.handler.codec.http.HttpHeaders;
import org.asynchttpclient.AsyncHandler;
import org.asynchttpclient.HttpResponseBodyPart;
import org.asynchttpclient.HttpResponseStatus;
import org.asynchttpclient.netty.ws.NettyWebSocket;

import static org.asynchttpclient.util.HttpConstants.ResponseStatusCodes.SWITCHING_PROTOCOLS_101;

import java.util.ArrayList;
import java.util.List;

/**
 * An {@link AsyncHandler} which is able to execute WebSocket upgrade. Use the Builder for configuring WebSocket options.
 */
public class WebSocketUpgradeHandler implements AsyncHandler {

  private final List listeners;
  private NettyWebSocket webSocket;

  public WebSocketUpgradeHandler(List listeners) {
    this.listeners = listeners;
  }

  protected void setWebSocket0(NettyWebSocket webSocket) {
  }

  protected void onStatusReceived0(HttpResponseStatus responseStatus) throws Exception {
  }

  protected void onHeadersReceived0(HttpHeaders headers) throws Exception {
  }

  protected void onBodyPartReceived0(HttpResponseBodyPart bodyPart) throws Exception {
  }

  protected void onCompleted0() throws Exception {
  }

  protected void onThrowable0(Throwable t) {
  }

  protected void onOpen0() {
  }

  @Override
  public final State onStatusReceived(HttpResponseStatus responseStatus) throws Exception {
    onStatusReceived0(responseStatus);
    return responseStatus.getStatusCode() == SWITCHING_PROTOCOLS_101 ? State.CONTINUE : State.ABORT;
  }

  @Override
  public final State onHeadersReceived(HttpHeaders headers) throws Exception {
    onHeadersReceived0(headers);
    return State.CONTINUE;
  }

  @Override
  public final State onBodyPartReceived(HttpResponseBodyPart bodyPart) throws Exception {
    onBodyPartReceived0(bodyPart);
    return State.CONTINUE;
  }

  @Override
  public final NettyWebSocket onCompleted() throws Exception {
    onCompleted0();
    return webSocket;
  }

  @Override
  public final void onThrowable(Throwable t) {
    onThrowable0(t);
    for (WebSocketListener listener : listeners) {
      if (webSocket != null) {
        webSocket.addWebSocketListener(listener);
      }
      listener.onError(t);
    }
  }

  public final void setWebSocket(NettyWebSocket webSocket) {
    this.webSocket = webSocket;
    setWebSocket0(webSocket);
  }

  public final void onOpen() {
    onOpen0();
    for (WebSocketListener listener : listeners) {
      webSocket.addWebSocketListener(listener);
      listener.onOpen(webSocket);
    }
    webSocket.processBufferedFrames();
  }

  /**
   * Build a {@link WebSocketUpgradeHandler}
   */
  public final static class Builder {

    private List listeners = new ArrayList<>(1);

    /**
     * Add a {@link WebSocketListener} that will be added to the {@link WebSocket}
     *
     * @param listener a {@link WebSocketListener}
     * @return this
     */
    public Builder addWebSocketListener(WebSocketListener listener) {
      listeners.add(listener);
      return this;
    }

    /**
     * Remove a {@link WebSocketListener}
     *
     * @param listener a {@link WebSocketListener}
     * @return this
     */
    public Builder removeWebSocketListener(WebSocketListener listener) {
      listeners.remove(listener);
      return this;
    }

    /**
     * Build a {@link WebSocketUpgradeHandler}
     *
     * @return a {@link WebSocketUpgradeHandler}
     */
    public WebSocketUpgradeHandler build() {
      return new WebSocketUpgradeHandler(listeners);
    }
  }
}