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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;

import java.util.Objects;

/**
 * A record class representing the status of connections to some host.
 */
public class HostStats {

  private final long activeConnectionCount;
  private final long idleConnectionCount;

  public HostStats(long activeConnectionCount,
                   long idleConnectionCount) {
    this.activeConnectionCount = activeConnectionCount;
    this.idleConnectionCount = idleConnectionCount;
  }

  /**
   * @return The sum of {@link #getHostActiveConnectionCount()} and {@link #getHostIdleConnectionCount()},
   * a long representing the total number of connections to this host.
   */
  public long getHostConnectionCount() {
    return activeConnectionCount + idleConnectionCount;
  }

  /**
   * @return A long representing the number of active connections to the host.
   */
  public long getHostActiveConnectionCount() {
    return activeConnectionCount;
  }

  /**
   * @return A long representing the number of idle connections in the connection pool.
   */
  public long getHostIdleConnectionCount() {
    return idleConnectionCount;
  }

  @Override
  public String toString() {
    return "There are " + getHostConnectionCount() +
            " total connections, " + getHostActiveConnectionCount() +
            " are active and " + getHostIdleConnectionCount() + " are idle.";
  }

  @Override
  public boolean equals(final Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    final HostStats hostStats = (HostStats) o;
    return activeConnectionCount == hostStats.activeConnectionCount &&
            idleConnectionCount == hostStats.idleConnectionCount;
  }

  @Override
  public int hashCode() {
    return Objects.hash(activeConnectionCount, idleConnectionCount);
  }
}