com.atomikos.datasource.xa.XID Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2020 Atomikos
*
* LICENSE CONDITIONS
*
* See http://www.atomikos.com/Main/WhichLicenseApplies for details.
*/
package com.atomikos.datasource.xa;
import java.io.Serializable;
import javax.transaction.xa.Xid;
/**
* Our Xid class with correct equals and hashCode.
*/
public class XID implements Serializable, Xid
{
private static final long serialVersionUID = 4796496938014754464L;
private static final int DEFAULT_FORMAT = ('A' << 24) + ('T' << 16) + ('O' << 8) + 'M';
// same formatID for each transaction
// -1 for null Xid, 0 for OSI CCR and positive for proprietary format...
private String cachedToStringForPerformance;
private final int formatId;
private final byte[] branchQualifier;
private final byte[] globalTransactionId;
private final String branchQualifierStr;
private final String globalTransactionIdStr;
private final String uniqueResourceName;
/**
* Create a new instance with the resource name as branch. This is the main
* constructor for new instances.
*
* @param tid
* @param branchQualifier
*
*/
public XID (String tid, String branchQualifier, String uniqueResourceName)
{
this.formatId = DEFAULT_FORMAT;
this.uniqueResourceName = uniqueResourceName;
this.globalTransactionIdStr=tid;
this.globalTransactionId = tid.toString ().getBytes ();
if ( this.globalTransactionId.length > Xid.MAXGTRIDSIZE )
throw new RuntimeException ( "Max global tid length exceeded." );
this.branchQualifierStr = branchQualifier;
this.branchQualifier = branchQualifier.getBytes ();
if ( this.branchQualifier.length > Xid.MAXBQUALSIZE )
throw new RuntimeException (
"Max branch qualifier length exceeded." );
}
/**
* Copy constructor needed during recovery: if the data source returns
* inappropriate instances (that do not implement equals and hashCode) then
* we will need this constructor.
*
*/
public XID (Xid xid)
{
this.formatId = xid.getFormatId ();
this.globalTransactionId = xid.getGlobalTransactionId ();
this.branchQualifier = xid.getBranchQualifier ();
this.globalTransactionIdStr = new String(xid.getGlobalTransactionId ());
this.branchQualifierStr= new String(xid.getBranchQualifier ());
this.uniqueResourceName = null;
}
@Override
public int getFormatId ()
{
return this.formatId;
}
@Override
public byte[] getBranchQualifier ()
{
return this.branchQualifier;
}
@Override
public byte[] getGlobalTransactionId ()
{
return this.globalTransactionId;
}
@Override
public boolean equals ( Object obj )
{
if (this == obj)
return true;
if (obj instanceof XID) {
XID xid = (XID) obj;
return toString().equals(xid.toString());
}
return false;
}
@Override
public String toString ()
{
if ( this.cachedToStringForPerformance == null ) {
String gtrid = byteArrayToHexString(getGlobalTransactionId());
String bqual = byteArrayToHexString(getBranchQualifier());
this.cachedToStringForPerformance = "XID: " + gtrid + ":" + bqual;
}
return this.cachedToStringForPerformance;
}
private static final byte[] HEX_CHAR_TABLE = {
(byte)'0', (byte)'1', (byte)'2', (byte)'3',
(byte)'4', (byte)'5', (byte)'6', (byte)'7',
(byte)'8', (byte)'9', (byte)'A', (byte)'B',
(byte)'C', (byte)'D', (byte)'E', (byte)'F'
};
private static String byteArrayToHexString(byte[] raw)
{
byte[] hex = new byte[2 * raw.length];
int index = 0;
for (byte b : raw) {
int v = b & 0xFF;
hex[index++] = HEX_CHAR_TABLE[v >>> 4];
hex[index++] = HEX_CHAR_TABLE[v & 0xF];
}
return new String(hex);
}
public String getBranchQualifierAsString() {
return this.branchQualifierStr;
}
public String getGlobalTransactionIdAsString() {
return this.globalTransactionIdStr;
}
@Override
public int hashCode ()
{
return toString ().hashCode ();
}
public String getUniqueResourceName() {
return uniqueResourceName;
}
}