/*
|
* 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
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
|
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
|
* 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
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. 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 2006-2009 Sun Microsystems, Inc.
|
* Portions Copyright 2013 ForgeRock AS.
|
*/
|
package org.opends.server.replication.common;
|
|
import java.util.Date;
|
|
import org.opends.server.types.ByteSequence;
|
import org.opends.server.types.ByteSequenceReader;
|
import org.opends.server.types.ByteString;
|
import org.opends.server.types.ByteStringBuilder;
|
|
/**
|
* Class used to represent Change Numbers.
|
*/
|
public class ChangeNumber implements java.io.Serializable,
|
java.lang.Comparable<ChangeNumber>
|
{
|
/**
|
* The number of bytes used by the byte string representation of a change
|
* number.
|
*
|
* @see #valueOf(ByteSequence)
|
* @see #toByteString()
|
* @see #toByteString(ByteStringBuilder)
|
*/
|
public static final int BYTE_ENCODING_LENGTH = 14;
|
|
/**
|
* The number of characters used by the string representation of a change
|
* number.
|
*
|
* @see #valueOf(String)
|
* @see #toString()
|
*/
|
public static final int STRING_ENCODING_LENGTH = 28;
|
|
private static final long serialVersionUID = -8802722277749190740L;
|
private final long timeStamp;
|
private final int seqnum;
|
private final int serverId;
|
|
/**
|
* Parses the provided {@link #toString()} representation of a change number.
|
*
|
* @param s
|
* The string to be parsed.
|
* @return The parsed change number.
|
* @see #toString()
|
*/
|
public static ChangeNumber valueOf(String s)
|
{
|
return new ChangeNumber(s);
|
}
|
|
/**
|
* Decodes the provided {@link #toByteString()} representation of a change
|
* number.
|
*
|
* @param bs
|
* The byte sequence to be parsed.
|
* @return The decoded change number.
|
* @see #toByteString()
|
*/
|
public static ChangeNumber valueOf(ByteSequence bs)
|
{
|
ByteSequenceReader reader = bs.asReader();
|
long timeStamp = reader.getLong();
|
int serverId = reader.getShort() & 0xffff;
|
int seqnum = reader.getInt();
|
return new ChangeNumber(timeStamp, seqnum, serverId);
|
}
|
|
/**
|
* Create a new ChangeNumber from a String.
|
*
|
* @param str the string from which to create a ChangeNumber
|
*/
|
public ChangeNumber(String str)
|
{
|
String temp = str.substring(0, 16);
|
timeStamp = Long.parseLong(temp, 16);
|
|
temp = str.substring(16, 20);
|
serverId = Integer.parseInt(temp, 16);
|
|
temp = str.substring(20, 28);
|
seqnum = Integer.parseInt(temp, 16);
|
}
|
|
/**
|
* Create a new ChangeNumber.
|
*
|
* @param time time for the ChangeNumber
|
* @param seq sequence number
|
* @param serverId2 identity of server
|
*/
|
public ChangeNumber(long time, int seq, int serverId2)
|
{
|
serverId = serverId2;
|
timeStamp = time;
|
seqnum = seq;
|
}
|
|
/**
|
* Getter for the time.
|
* @return the time
|
*/
|
public long getTime()
|
{
|
return timeStamp;
|
}
|
|
/**
|
* Get the timestamp associated to this ChangeNumber in seconds.
|
* @return timestamp associated to this ChangeNumber in seconds
|
*/
|
public long getTimeSec()
|
{
|
return timeStamp/1000;
|
}
|
|
/**
|
* Getter for the sequence number.
|
* @return the sequence number
|
*/
|
public int getSeqnum()
|
{
|
return seqnum;
|
}
|
|
/**
|
* Getter for the server ID.
|
* @return the server ID
|
*/
|
public int getServerId()
|
{
|
return serverId;
|
}
|
|
|
/**
|
* {@inheritDoc}
|
*/
|
public boolean equals(Object obj)
|
{
|
if (obj instanceof ChangeNumber)
|
{
|
ChangeNumber cn = (ChangeNumber) obj;
|
return this.seqnum == cn.seqnum &&
|
this.serverId == cn.serverId &&
|
this.timeStamp == cn.timeStamp;
|
}
|
else
|
return false;
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public int hashCode()
|
{
|
return this.seqnum + this.serverId + Long.valueOf(timeStamp).hashCode();
|
}
|
|
/**
|
* Encodes this change number as a byte string.
|
* <p>
|
* NOTE: this representation must not be modified otherwise interop with
|
* earlier protocol versions will be broken.
|
*
|
* @return The encoded representation of this change number.
|
* @see #valueOf(ByteSequence)
|
*/
|
public ByteString toByteString()
|
{
|
return toByteString(new ByteStringBuilder(BYTE_ENCODING_LENGTH))
|
.toByteString();
|
}
|
|
/**
|
* Encodes this change number into the provided byte string builder.
|
* <p>
|
* NOTE: this representation must not be modified otherwise interop with
|
* earlier protocol versions will be broken.
|
*
|
* @param builder
|
* The byte string builder.
|
* @return The byte string builder containing the encoded change number.
|
* @see #valueOf(ByteSequence)
|
*/
|
public ByteStringBuilder toByteString(ByteStringBuilder builder)
|
{
|
return builder.append(timeStamp).append((short) (serverId & 0xffff))
|
.append(seqnum);
|
}
|
|
/**
|
* Convert the ChangeNumber to a printable String.
|
* <p>
|
* NOTE: this representation must not be modified otherwise interop with
|
* earlier protocol versions will be broken.
|
*
|
* @return the string
|
*/
|
public String toString()
|
{
|
return String.format("%016x%04x%08x", timeStamp, serverId, seqnum);
|
}
|
|
/**
|
* Convert the ChangeNumber to a printable String with a user friendly
|
* format.
|
*
|
* @return the string
|
*/
|
public String toStringUI()
|
{
|
Date date = new Date(timeStamp);
|
return String.format(
|
"%016x%04x%08x (sid=%d,tsd=%s,ts=%d,seqnum=%d)",
|
timeStamp, serverId, seqnum,
|
serverId, date.toString(), timeStamp, seqnum);
|
}
|
|
/**
|
* Compares 2 ChangeNumber.
|
* @param CN1 the first ChangeNumber to compare
|
* @param CN2 the second ChangeNumber to compare
|
* @return value 0 if changeNumber matches, negative if first
|
* changeNumber is smaller, positive otherwise
|
*/
|
public static int compare(ChangeNumber CN1, ChangeNumber CN2)
|
{
|
if (CN1 == null)
|
{
|
if (CN2 == null)
|
return 0;
|
else
|
return -1;
|
}
|
else if (CN2 == null)
|
return 1;
|
else if (CN1.timeStamp < CN2.timeStamp)
|
return -1;
|
else if (CN2.timeStamp < CN1.timeStamp)
|
return 1;
|
else
|
{
|
// timestamps are equals compare seqnums
|
if (CN1.seqnum < CN2.seqnum)
|
return -1;
|
else if (CN2.seqnum < CN1.seqnum)
|
return 1;
|
else
|
{
|
// timestamp and seqnum are equals compare serverIds
|
if (CN1.serverId < CN2.serverId)
|
return -1;
|
else if (CN2.serverId < CN1.serverId)
|
return 1;
|
|
// if we get here ChangeNumber are equals
|
return 0;
|
}
|
|
}
|
}
|
|
/**
|
* Computes the difference in number of changes between 2
|
* change numbers. First one is expected to be newer than second one. If this
|
* is not the case, 0 will be returned.
|
* @param op1 the first ChangeNumber
|
* @param op2 the second ChangeNumber
|
* @return the difference
|
*/
|
public static int diffSeqNum(ChangeNumber op1, ChangeNumber op2)
|
{
|
if (op1 == null)
|
{
|
return 0;
|
}
|
if (op2 == null)
|
{
|
return op1.getSeqnum();
|
}
|
if (op2.newerOrEquals(op1))
|
{
|
return 0;
|
}
|
|
int seqnum1 = op1.getSeqnum();
|
long time1 = op1.getTime();
|
int seqnum2 = op2.getSeqnum();
|
long time2 = op2.getTime();
|
|
if (time2 <= time1)
|
{
|
if (seqnum2 <= seqnum1)
|
{
|
return seqnum1 - seqnum2;
|
} else
|
{
|
return Integer.MAX_VALUE - (seqnum2 - seqnum1) + 1;
|
}
|
} else
|
{
|
return 0;
|
}
|
}
|
|
/**
|
* check if the current Object is strictly older than ChangeNumber
|
* given in parameter.
|
* @param CN the Changenumber to compare with
|
* @return true if strictly older, false if younger or same
|
*/
|
public Boolean older(ChangeNumber CN)
|
{
|
return compare(this, CN) < 0;
|
}
|
|
/**
|
* check if the current Object is older than ChangeNumber
|
* given in parameter.
|
* @param CN the Changenumber to compare with
|
* @return true if older or equal, false if younger
|
*/
|
public Boolean olderOrEqual(ChangeNumber CN)
|
{
|
return compare(this, CN) <= 0;
|
}
|
|
/**
|
* Check if the current Object is newer than ChangeNumber.
|
* @param CN the Changenumber to compare with
|
* @return true if newer
|
*/
|
public boolean newerOrEquals(ChangeNumber CN)
|
{
|
return compare(this, CN) >= 0;
|
}
|
|
/**
|
* Check if the current Object is strictly newer than ChangeNumber.
|
* @param CN the Changenumber to compare with
|
* @return true if strictly newer
|
*/
|
public boolean newer(ChangeNumber CN)
|
{
|
return compare(this, CN) > 0;
|
}
|
|
/**
|
* Compares this object with the specified object for order.
|
* @param cn the ChangeNumber to compare with.
|
* @return a negative integer, zero, or a positive integer as this object
|
* is less than, equal to, or greater than the specified object.
|
*/
|
public int compareTo(ChangeNumber cn)
|
{
|
return compare(this, cn);
|
}
|
}
|
