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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2014 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.timeout;

import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;
import org.asynchttpclient.AsyncHttpClientConfig;
import org.asynchttpclient.Request;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.request.NettyRequestSender;

import java.net.InetSocketAddress;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import static org.asynchttpclient.util.DateUtils.unpreciseMillisTime;

public class TimeoutsHolder {

  private final Timeout requestTimeout;
  private final AtomicBoolean cancelled = new AtomicBoolean();
  private final Timer nettyTimer;
  private final NettyRequestSender requestSender;
  private final long requestTimeoutMillisTime;
  private final int readTimeoutValue;
  private volatile Timeout readTimeout;
  private volatile NettyResponseFuture nettyResponseFuture;
  private volatile InetSocketAddress remoteAddress;

  public TimeoutsHolder(Timer nettyTimer, NettyResponseFuture nettyResponseFuture, NettyRequestSender requestSender, AsyncHttpClientConfig config, InetSocketAddress originalRemoteAddress) {
    this.nettyTimer = nettyTimer;
    this.nettyResponseFuture = nettyResponseFuture;
    this.requestSender = requestSender;
    this.remoteAddress = originalRemoteAddress;

    final Request targetRequest = nettyResponseFuture.getTargetRequest();

    final int readTimeoutInMs = targetRequest.getReadTimeout();
    this.readTimeoutValue = readTimeoutInMs == 0 ? config.getReadTimeout() : readTimeoutInMs;

    int requestTimeoutInMs = targetRequest.getRequestTimeout();
    if (requestTimeoutInMs == 0) {
      requestTimeoutInMs = config.getRequestTimeout();
    }

    if (requestTimeoutInMs != -1) {
      requestTimeoutMillisTime = unpreciseMillisTime() + requestTimeoutInMs;
      requestTimeout = newTimeout(new RequestTimeoutTimerTask(nettyResponseFuture, requestSender, this, requestTimeoutInMs), requestTimeoutInMs);
    } else {
      requestTimeoutMillisTime = -1L;
      requestTimeout = null;
    }
  }

  public void setResolvedRemoteAddress(InetSocketAddress address) {
    remoteAddress = address;
  }

  InetSocketAddress remoteAddress() {
    return remoteAddress;
  }

  public void startReadTimeout() {
    if (readTimeoutValue != -1) {
      startReadTimeout(null);
    }
  }

  void startReadTimeout(ReadTimeoutTimerTask task) {
    if (requestTimeout == null || (!requestTimeout.isExpired() && readTimeoutValue < (requestTimeoutMillisTime - unpreciseMillisTime()))) {
      // only schedule a new readTimeout if the requestTimeout doesn't happen first
      if (task == null) {
        // first call triggered from outside (else is read timeout is re-scheduling itself)
        task = new ReadTimeoutTimerTask(nettyResponseFuture, requestSender, this, readTimeoutValue);
      }
      this.readTimeout = newTimeout(task, readTimeoutValue);

    } else if (task != null) {
      // read timeout couldn't re-scheduling itself, clean up
      task.clean();
    }
  }

  public void cancel() {
    if (cancelled.compareAndSet(false, true)) {
      if (requestTimeout != null) {
        requestTimeout.cancel();
        RequestTimeoutTimerTask.class.cast(requestTimeout.task()).clean();
      }
      if (readTimeout != null) {
        readTimeout.cancel();
        ReadTimeoutTimerTask.class.cast(readTimeout.task()).clean();
      }
    }
  }

  private Timeout newTimeout(TimerTask task, long delay) {
    return requestSender.isClosed() ? null : nettyTimer.newTimeout(task, delay, TimeUnit.MILLISECONDS);
  }
}