com.atomikos.datasource.xa.AbstractXidFactory Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2010 Atomikos
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*/
package com.atomikos.datasource.xa;
import javax.transaction.xa.Xid;
/**
*
*
*
* An abstract superclass for all XidFactory implementations. This class
* provides the functionality to create really unique XIDs.
*
*
*
*
*/
public abstract class AbstractXidFactory implements XidFactory
{
private static final int MAX_LENGTH_OF_COUNTER = 8;
//default scope for testing issue 10086
static long counter = 0;
// to make sure that XIDs for the same
// combination of TM,TID are still unique
protected static void incCounter ()
{
counter++;
}
protected static long getCounter ()
{
return counter;
}
public AbstractXidFactory ()
{
super ();
}
/**
* @see com.atomikos.datasource.xa.XidFactory
*/
public Xid createXid ( String tid , String resourcename )
{
if ( resourcename.getBytes().length + MAX_LENGTH_OF_COUNTER > XID.MAXBQUALSIZE ) {
// see case 73086
throw new IllegalArgumentException ( "Value too long: " + resourcename );
}
// first increment counter to make sure it is
// different from the last call that was done
// by the SAME tid (works because calls within
// one TID are serial)
incCounter ();
return new XID ( tid, resourcename + getCounter () );
}
}