/**
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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 org.apache.hadoop.hbase.ipc;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.security.User;
  
  import java.net.InetSocketAddress;
  
  /**
   * This class holds the address and the user ticket, etc. The client connections
   * to servers are uniquely identified by <remoteAddress, ticket, serviceName>
   */
  @InterfaceAudience.Private
  public class ConnectionId {
    private static final int PRIME = 16777619;
    final User ticket;
    final String serviceName;
    final InetSocketAddress address;
  
    public ConnectionId(User ticket, String serviceName, InetSocketAddress address) {
      this.address = address;
      this.ticket = ticket;
      this.serviceName = serviceName;
    }
  
    public String getServiceName() {
      return this.serviceName;
    }
  
    public InetSocketAddress getAddress() {
      return address;
    }
  
    public User getTicket() {
      return ticket;
    }
  
    @Override
    public String toString() {
      return this.address.toString() + "/" + this.serviceName + "/" + this.ticket;
    }
  
    @Override
    public boolean equals(Object obj) {
     if (obj instanceof ConnectionId) {
       ConnectionId id = (ConnectionId) obj;
       return address.equals(id.address) &&
              ((ticket != null && ticket.equals(id.ticket)) ||
               (ticket == id.ticket)) &&
               this.serviceName == id.serviceName;
     }
     return false;
    }
  
    @Override  // simply use the default Object#hashcode() ?
    public int hashCode() {
      return hashCode(ticket,serviceName,address);
    }
  
    public static int hashCode(User ticket, String serviceName, InetSocketAddress address){
      return (address.hashCode() +
          PRIME * (PRIME * serviceName.hashCode() ^
              (ticket == null ? 0 : ticket.hashCode())));
    }
  }