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/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
//----------------------------------------------------------------------------
//
// Module: XID.java
//
// Description: An implementation of the X/Open transaction idenifier (Xid).
//
// Product: com.sun.jts.jtsxa
//
// Author: Malcolm Ayres
//
// Date: March, 1997
//
// Copyright (c): 1995-1997 IBM Corp.
//
// The source code for this program is not published or otherwise divested
// of its trade secrets, irrespective of what has been deposited with the
// U.S. Copyright Office.
//
// This software contains confidential and proprietary information of
// IBM Corp.
//----------------------------------------------------------------------------
package com.sun.jts.jtsxa;
import org.omg.CosTransactions.*;
import javax.transaction.xa.Xid;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
import com.sun.jts.utils.LogFormatter;
/**
* The XID class provides an implementation of the X/Open
* transaction identifier it implements the javax.transaction.xa.Xid interface.
*/
public class XID implements Xid {
//-----------------------------------------------------------------------//
// Data Area //
//-----------------------------------------------------------------------//
/**
* The format identifier for the XID. A value of -1 indicates
* that the NULLXID.
*/
private int formatID; // Format identifier
// (-1) means that the XID is null
/**
* The number of bytes in the global transaction identfier
*/
private int gtrid_length; // Value from 1 through 64
/**
* The number of bytes in the branch qualifier
*/
private int bqual_length; // Value from 1 through 64
/**
* The data for the XID.
* <p> The XID is made up of two contiguous parts. The first (of size
* <b>gtrid_length</b>) is the global transaction identfier and the second
* (of size <b>bqual_length</b>) is the branch qualifier.
* <p>If the <b>formatID</b> is -1, indicating the NULLXID,
* the data is ignored.
*/
private byte data[]; // The XID data (size XIDDATASIZE)
// ADDITION
private byte cachedBqual[] = null;
private byte cachedGtrid[] = null;
//-----------------------------------------------------------------------//
// Constants //
//-----------------------------------------------------------------------//
/**
* The size of <b>data</b>.
*/
static private final int XIDDATASIZE= 128; // Size in bytes
/**
* The maximum size of the global transaction identifier.
*/
static public final int MAXGTRIDSIZE= 64; // Maximum size (in bytes) of gtrid
/**
* The maximum size of the branch qualifier.
*/
static public final int MAXBQUALSIZE= 64; // Maximum size (in bytes) of bqual
static private final String hextab= "0123456789ABCDEF"/*#Frozen*/;
static Logger _logger = LogDomains.getLogger(LogDomains.TRANSACTION_LOGGER);
//-----------------------------------------------------------------------//
// XID::Constructor //
//-----------------------------------------------------------------------//
/**
* Constructs a new null XID.
* <p>After construction the data within the XID should be initialized.
*/
public XID() {
data= new byte[XIDDATASIZE];
formatID = -1;
}
//-----------------------------------------------------------------------//
// XID::Methods //
//-----------------------------------------------------------------------//
/**
* Initialize an XID using another XID as the source of data.
*
* @param from the XID to initialize this XID from
*
*/
public void copy(XID from) {
int i;
formatID = -1; // Default, null transaction
if (from == null) // If source is physically null
{
return; // Return the NULL transaction
}
if (from.formatID == (-1)) // If source is a NULL transaction
{
return; // Return the NULL transaction
}
gtrid_length= from.gtrid_length;
bqual_length= from.bqual_length;
if (data != null && from.data != null) {
System.arraycopy(from.data, 0, data, 0, XIDDATASIZE);
}
formatID= from.formatID; // Last, in case of failure
}
/*
* Copy the XID from an otid_t format XID.
*/
/**
* Initialize an XID using an omg otid_t as the source of data.
*
* @param from the OMG otid_t to initialize this XID from
*
* @see org.omg.CosTransactions.otid_t
*/
public void copy(otid_t from) {
int i;
int L;
formatID= -1; // Default, null transaction
if (from == null) // If source is physically null
{
return; // Return the NULL transaction
}
if (from.formatID == (-1)) // If source is a NULL transaction
{
return; // Return the NULL transaction
}
L= from.tid.length;
gtrid_length= L - from.bqual_length;
bqual_length= from.bqual_length;
if (data != null && from.tid != null) {
System.arraycopy(from.tid, 0, data, 0, L);
}
formatID= from.formatID; // Last, in case of failure
}
/*
* Are the XIDs equal?
*/
/**
* Determine whether or not two objects of this type are equal.
*
* @param o the object to be compared with this XID.
*
* @return Returns true of the supplied object represents the same
* global transaction as this, otherwise returns false.
*/
public boolean equals(Object o) {
XID other; // The "other" XID
int L; // Combined gtrid_length + bqual_length
int i;
if (!(o instanceof XID)) // If the other XID isn't an XID
{
return false; // It can't be equal
}
other = (XID)o; // The other XID, now properly cast
if (formatID == (-1) && other.formatID == (-1))
{
return true;
}
if (formatID != other.formatID
||gtrid_length != other.gtrid_length
||bqual_length != other.bqual_length) {
return false;
}
L = gtrid_length + bqual_length;
for (i = 0; i < L; i++) {
if (data[i] != other.data[i]) {
return false;
}
}
return true;
}
/*
* Compute the hash code.
*/
/**
* Compute the hash code.
*
* @return the computed hashcode
*/
public int hashCode() {
if (formatID == (-1)) {
return (-1);
}
return formatID + gtrid_length - bqual_length;
}
/*
* Convert to String
*
* <p> This is normally used to display the XID when debugging.
*/
/**
* Return a string representing this XID.
*
* @return the string representation of this XID
*/
public String toString() {
/* toString() method is slightly expensive and this needs to be done because
* some of the drivers XAResource methods have the "trace("some thing " + xid)"
* kind of code which is executing this method resulting in performance degradation.
*/
if (_logger.isLoggable(Level.FINE)) {
StringBuffer d; // Data String, in Hexidecimal
String s; // Resultant String
int i;
int v;
int L;
L= gtrid_length + bqual_length;
d= new StringBuffer(L + L);
// Convert data string to hex
for (i = 0; i < L; i++) {
v = data[i] & 0xff;
d.append(hextab.charAt(v/16));
d.append(hextab.charAt(v&15));
if ((i+1) % 4 == 0 && (i+1) < L) {
d.append(" ");
}
}
s = new String("{XID: " +
"formatID(" + formatID + "), " +
"gtrid_length(" + gtrid_length + "), " +
"bqual_length(" + bqual_length + "), " +
"data(" + d + ")" +
"}"/*#Frozen*/);
return s;
}
else
return null;
}
/*
* Return branch qualifier
*/
/**
* Returns the branch qualifier for this XID.
*
* @return the branch qualifier
*/
public byte[] getBranchQualifier() {
if (cachedBqual != null) {
return cachedBqual;
}
byte[] bqual = new byte[bqual_length];
System.arraycopy(data,gtrid_length,bqual,0,bqual_length);
return bqual;
}
/*
* Set branch qualifier.
*
* Note that the branch qualifier has a maximum size.
*/
/**
* Set the branch qualifier for this XID.
*
* @param qual a Byte array containing the branch qualifier to be set. If
* the size of the array exceeds MAXBQUALSIZE, only the first
* MAXBQUALSIZE elements of qual will be used.
*/
public void setBranchQualifier(byte[] qual) {
bqual_length = qual.length > MAXBQUALSIZE ? MAXBQUALSIZE : qual.length;
System.arraycopy(qual, 0, data, gtrid_length, bqual_length);
cachedBqual = qual;
}
/**
* Obtain the format identifier part of the XID.
*
* @return Format identifier. -1 indicates a null XID
*/
public int getFormatID() {
return formatID;
}
/**
* Set the format identifier part of the XID.
*
* @param Format identifier. -1 indicates a null Xid.
*/
public void setFormatID(int formatID) {
this.formatID = formatID;
return;
}
/*
* Determine if an array of bytes equals the branch qualifier
*/
/**
* Compares the input parameter with the branch qualifier for equality.
*
* @return true if equal
*/
public boolean isEqualBranchQualifier(byte[] data) {
int L = data.length > MAXBQUALSIZE?MAXBQUALSIZE:data.length;
int i;
if (L != bqual_length) {
return false;
}
for (i = 0; i < L; i++) {
if (data[i] != this.data[gtrid_length + i]) {
return false;
}
}
return true;
}
// added by TN
/**
* Return whether the Gtrid of this is equal to the Gtrid of xid
*/
public boolean isEqualGtrid(XID xid) {
if (this.gtrid_length != xid.gtrid_length) {
return false;
}
for (int i=0; i<gtrid_length; i++) {
if (this.data[i] != xid.data[i]) {
return false;
}
}
return true;
}
/*
* Return global transaction identifier
*/
/**
* Returns the global transaction identifier for this XID.
*
* @return the global transaction identifier
*/
public byte[] getGlobalTransactionIdentifier() {
if (cachedGtrid != null) {
return cachedGtrid;
}
byte[] gtrid = new byte[gtrid_length];
System.arraycopy(data, 0, gtrid, 0, gtrid_length);
cachedGtrid = gtrid;
return gtrid;
}
// Addition by Tony Ng to make this class implements
// javax.transaction.xa.Xid
public int getFormatId() {
return getFormatID();
}
public byte[] getGlobalTransactionId() {
return getGlobalTransactionIdentifier();
}
}
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