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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */

package com.gemstone.gemfire.distributed.internal.locks;

import com.gemstone.gemfire.distributed.DistributedMember;

/**
 * Uniquely identifies a remote thread by DistributedMember and threadId
 * sequence that is unique within the DLockService instance of that member.
 */
public class RemoteThread {
  
  private final DistributedMember member;
  private final int threadId;

  /** Constructs new immutable instance of RemoteThread */
  RemoteThread(DistributedMember member, int threadId) {
    this.member = member;
    this.threadId = threadId;
  }
  
  public DistributedMember getDistributedMember() {
    return this.member;
  }
  
  public int getThreadId() {
    return this.threadId;
  }
  
  @Override
  public boolean equals(Object other) {
    if (other == this) return true;
    if (other == null) return false;
    if (!(other instanceof RemoteThread)) return  false;
    final RemoteThread that = (RemoteThread) other;

    if (this.member != that.member &&
        !(this.member != null &&
        this.member.equals(that.member))) return false;
    if (this.threadId != that.threadId) return false;

    return true;
  }
  
  @Override
  public int hashCode() {
    int result = 17;
    final int mult = 37;

    result = mult * result + 
      (this.member == null ? 0 : this.member.hashCode());
    result = mult * result + this.threadId;

    return result;
  }

  /**
   * Returns a string representation of the object.
   * 
   * @return a string representation of the object
   */
  @Override
  public String toString() {
    final StringBuffer sb = new StringBuffer("[RemoteThread@");
    sb.append(System.identityHashCode(this)).append(": ");
    sb.append("member@").append(System.identityHashCode(this.member)).append("=").append(this.member);
    sb.append(", threadId=").append(this.threadId);
    sb.append("]");
    return sb.toString();
  }

}