/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2009 Sun Microsystems, Inc.
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* Portions Copyright 2013 ForgeRock AS.
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*/
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package org.opends.server.replication.common;
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import java.util.Date;
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import org.opends.server.types.ByteSequence;
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import org.opends.server.types.ByteSequenceReader;
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import org.opends.server.types.ByteString;
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import org.opends.server.types.ByteStringBuilder;
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/**
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* Class used to represent Change Numbers.
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*/
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public class ChangeNumber implements java.io.Serializable,
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java.lang.Comparable<ChangeNumber>
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{
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/**
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* The number of bytes used by the byte string representation of a change
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* number.
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*
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* @see #valueOf(ByteSequence)
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* @see #toByteString()
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* @see #toByteString(ByteStringBuilder)
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*/
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public static final int BYTE_ENCODING_LENGTH = 14;
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/**
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* The number of characters used by the string representation of a change
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* number.
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*
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* @see #valueOf(String)
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* @see #toString()
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*/
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public static final int STRING_ENCODING_LENGTH = 28;
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private static final long serialVersionUID = -8802722277749190740L;
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private final long timeStamp;
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private final int seqnum;
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private final int serverId;
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/**
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* Parses the provided {@link #toString()} representation of a change number.
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*
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* @param s
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* The string to be parsed.
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* @return The parsed change number.
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* @see #toString()
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*/
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public static ChangeNumber valueOf(String s)
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{
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return new ChangeNumber(s);
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}
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/**
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* Decodes the provided {@link #toByteString()} representation of a change
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* number.
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*
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* @param bs
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* The byte sequence to be parsed.
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* @return The decoded change number.
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* @see #toByteString()
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*/
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public static ChangeNumber valueOf(ByteSequence bs)
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{
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ByteSequenceReader reader = bs.asReader();
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long timeStamp = reader.getLong();
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int serverId = reader.getShort() & 0xffff;
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int seqnum = reader.getInt();
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return new ChangeNumber(timeStamp, seqnum, serverId);
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}
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/**
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* Create a new ChangeNumber from a String.
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*
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* @param str the string from which to create a ChangeNumber
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*/
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public ChangeNumber(String str)
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{
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String temp = str.substring(0, 16);
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timeStamp = Long.parseLong(temp, 16);
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temp = str.substring(16, 20);
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serverId = Integer.parseInt(temp, 16);
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temp = str.substring(20, 28);
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seqnum = Integer.parseInt(temp, 16);
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}
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/**
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* Create a new ChangeNumber.
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*
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* @param timeStamp timeStamp for the ChangeNumber
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* @param seqNum sequence number
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* @param serverId identity of server
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*/
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public ChangeNumber(long timeStamp, int seqNum, int serverId)
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{
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this.serverId = serverId;
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this.timeStamp = timeStamp;
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this.seqnum = seqNum;
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}
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/**
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* Getter for the time.
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* @return the time
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*/
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public long getTime()
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{
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return timeStamp;
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}
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/**
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* Get the timestamp associated to this ChangeNumber in seconds.
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* @return timestamp associated to this ChangeNumber in seconds
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*/
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public long getTimeSec()
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{
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return timeStamp/1000;
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}
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/**
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* Getter for the sequence number.
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* @return the sequence number
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*/
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public int getSeqnum()
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{
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return seqnum;
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}
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/**
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* Getter for the server ID.
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* @return the server ID
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*/
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public int getServerId()
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{
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return serverId;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean equals(Object obj)
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{
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if (obj instanceof ChangeNumber)
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{
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ChangeNumber cn = (ChangeNumber) obj;
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return this.seqnum == cn.seqnum &&
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this.serverId == cn.serverId &&
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this.timeStamp == cn.timeStamp;
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}
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int hashCode()
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{
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return this.seqnum + this.serverId + Long.valueOf(timeStamp).hashCode();
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}
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/**
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* Encodes this change number as a byte string.
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* <p>
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* NOTE: this representation must not be modified otherwise interop with
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* earlier protocol versions will be broken.
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*
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* @return The encoded representation of this change number.
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* @see #valueOf(ByteSequence)
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*/
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public ByteString toByteString()
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{
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return toByteString(new ByteStringBuilder(BYTE_ENCODING_LENGTH))
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.toByteString();
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}
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/**
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* Encodes this change number into the provided byte string builder.
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* <p>
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* NOTE: this representation must not be modified otherwise interop with
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* earlier protocol versions will be broken.
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*
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* @param builder
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* The byte string builder.
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* @return The byte string builder containing the encoded change number.
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* @see #valueOf(ByteSequence)
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*/
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public ByteStringBuilder toByteString(ByteStringBuilder builder)
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{
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return builder.append(timeStamp).append((short) (serverId & 0xffff))
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.append(seqnum);
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}
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/**
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* Convert the ChangeNumber to a printable String.
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* <p>
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* NOTE: this representation must not be modified otherwise interop with
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* earlier protocol versions will be broken.
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*
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* @return the string
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*/
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@Override
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public String toString()
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{
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return String.format("%016x%04x%08x", timeStamp, serverId, seqnum);
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}
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/**
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* Convert the ChangeNumber to a printable String with a user friendly
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* format.
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*
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* @return the string
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*/
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public String toStringUI()
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{
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Date date = new Date(timeStamp);
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return String.format(
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"%016x%04x%08x (sid=%d,tsd=%s,ts=%d,seqnum=%d)",
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timeStamp, serverId, seqnum,
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serverId, date.toString(), timeStamp, seqnum);
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}
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/**
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* Compares 2 ChangeNumber.
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* @param CN1 the first ChangeNumber to compare
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* @param CN2 the second ChangeNumber to compare
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* @return value 0 if changeNumber matches, negative if first
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* changeNumber is smaller, positive otherwise
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*/
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public static int compare(ChangeNumber CN1, ChangeNumber CN2)
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{
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if (CN1 == null)
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{
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if (CN2 == null)
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return 0;
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return -1;
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}
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else if (CN2 == null)
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return 1;
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else if (CN1.timeStamp < CN2.timeStamp)
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return -1;
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else if (CN2.timeStamp < CN1.timeStamp)
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return 1;
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else
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{
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// timestamps are equals compare seqnums
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if (CN1.seqnum < CN2.seqnum)
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return -1;
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else if (CN2.seqnum < CN1.seqnum)
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return 1;
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else
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{
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// timestamp and seqnum are equals compare serverIds
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if (CN1.serverId < CN2.serverId)
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return -1;
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else if (CN2.serverId < CN1.serverId)
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return 1;
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// if we get here ChangeNumber are equals
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return 0;
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}
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}
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}
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/**
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* Computes the difference in number of changes between 2
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* change numbers. First one is expected to be newer than second one. If this
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* is not the case, 0 will be returned.
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* @param op1 the first ChangeNumber
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* @param op2 the second ChangeNumber
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* @return the difference
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*/
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public static int diffSeqNum(ChangeNumber op1, ChangeNumber op2)
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{
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if (op1 == null)
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{
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return 0;
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}
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if (op2 == null)
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{
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return op1.getSeqnum();
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}
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if (op2.newerOrEquals(op1))
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{
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return 0;
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}
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int seqnum1 = op1.getSeqnum();
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long time1 = op1.getTime();
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int seqnum2 = op2.getSeqnum();
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long time2 = op2.getTime();
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if (time2 <= time1)
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{
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if (seqnum2 <= seqnum1)
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{
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return seqnum1 - seqnum2;
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}
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return Integer.MAX_VALUE - (seqnum2 - seqnum1) + 1;
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}
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return 0;
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}
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/**
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* check if the current Object is strictly older than ChangeNumber
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* given in parameter.
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* @param CN the ChangeNumber to compare with
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* @return true if strictly older, false if younger or same
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*/
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public boolean older(ChangeNumber CN)
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{
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return compare(this, CN) < 0;
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}
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/**
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* check if the current Object is older than ChangeNumber
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* given in parameter.
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* @param CN the ChangeNumber to compare with
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* @return true if older or equal, false if younger
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*/
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public boolean olderOrEqual(ChangeNumber CN)
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{
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return compare(this, CN) <= 0;
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}
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/**
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* Check if the current Object is newer than ChangeNumber.
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* @param CN the ChangeNumber to compare with
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* @return true if newer
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*/
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public boolean newerOrEquals(ChangeNumber CN)
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{
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return compare(this, CN) >= 0;
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}
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/**
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* Check if the current Object is strictly newer than ChangeNumber.
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* @param CN the ChangeNumber to compare with
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* @return true if strictly newer
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*/
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public boolean newer(ChangeNumber CN)
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{
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return compare(this, CN) > 0;
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}
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/**
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* Compares this object with the specified object for order.
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* @param cn the ChangeNumber to compare with.
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* @return a negative integer, zero, or a positive integer as this object
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* is less than, equal to, or greater than the specified object.
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*/
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@Override
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public int compareTo(ChangeNumber cn)
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{
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return compare(this, cn);
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}
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}
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