/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at legal-notices/CDDLv1_0.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2008-2009 Sun Microsystems, Inc.
 *      Portions copyright 2013-2014 ForgeRock AS.
 */
package org.opends.server.replication.protocol;

import java.util.zip.DataFormatException;

/**
 * This message is part of the replication protocol. RS1 sends a
 * MonitorRequestMsg to RS2 to request its monitoring information. When RS2
 * receives a MonitorRequestMsg from RS1, RS2 responds with a MonitorMessage.
 */
public class MonitorRequestMsg extends ReplicationMsg
{
  /**
   * The destination server or servers of this message.
   */
  private final int destination;

  /**
   * The serverID of the server that sends this message.
   */
  private final int senderID;

  /**
   * Creates a message.
   *
   * @param serverID
   *          The sender server of this message.
   * @param destination
   *          The server or servers targeted by this message.
   */
  public MonitorRequestMsg(int serverID, int destination)
  {
    this.senderID = serverID;
    this.destination = destination;
  }



  /**
   * Creates a new message by decoding the provided byte array.
   *
   * @param in
   *          A byte array containing the encoded information for the message,
   * @throws DataFormatException
   *           If the in does not contain a properly, encoded message.
   */
  MonitorRequestMsg(byte[] in) throws DataFormatException
  {
    final ByteArrayScanner scanner = new ByteArrayScanner(in);
    final byte msgType = scanner.nextByte();
    if (msgType != MSG_TYPE_REPL_SERVER_MONITOR_REQUEST)
    {
      throw new DataFormatException("input is not a valid "
          + getClass().getCanonicalName());
    }
    this.senderID = scanner.nextIntUTF8();
    this.destination = scanner.nextIntUTF8();
  }

  /** {@inheritDoc} */
  @Override
  public byte[] getBytes(short protocolVersion)
  {
    final ByteArrayBuilder builder = new ByteArrayBuilder();
    builder.appendByte(MSG_TYPE_REPL_SERVER_MONITOR_REQUEST);
    builder.appendIntUTF8(senderID);
    builder.appendIntUTF8(destination);
    return builder.toByteArray();
  }

  /**
   * Get the destination.
   *
   * @return the destination
   */
  public int getDestination()
  {
    return destination;
  }

  /**
   * Get the server ID of the server that sent this message.
   *
   * @return the server id
   */
  public int getSenderID()
  {
    return senderID;
  }

  /**
   * Returns a string representation of the message.
   *
   * @return the string representation of this message.
   */
  @Override
  public String toString()
  {
    return "[" + getClass().getCanonicalName() + " sender=" + senderID
        + " destination=" + destination + "]";
  }
}