/*
* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.transaction.tm;
import org.infinispan.io.UnsignedNumeric;
import org.infinispan.util.Util;
import javax.transaction.xa.Xid;
import java.util.Arrays;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;
/**
* Implementation of Xid.
* @author Mircea.Markus@jboss.com
* @since 4.0
*/
public final class DummyXid implements Xid {
private static final AtomicLong GLOBAL_ID_GENERATOR = new AtomicLong(1);
private static final AtomicLong BRANCH_QUALIFIER_GENERATOR = new AtomicLong(1);
private byte[] globalTransactionId = new byte[64];
private byte[] branchQualifier = new byte[64];
private final int cachedHashcode;
@Override
public int getFormatId() {
return 1;
}
public DummyXid(UUID transactionManagerId) {
cachedHashcode = initializeAndCalculateHash(transactionManagerId);
}
@Override
public byte[] getGlobalTransactionId() {
return globalTransactionId;
}
@Override
public byte[] getBranchQualifier() {
return branchQualifier;
}
private int initializeAndCalculateHash(UUID transactionManagerId) {
int hc1 = initialize(transactionManagerId, GLOBAL_ID_GENERATOR, globalTransactionId);
return 37 * hc1 + initialize(transactionManagerId, BRANCH_QUALIFIER_GENERATOR, branchQualifier);
}
private int initialize(UUID transactionManagerId, AtomicLong generator, byte[] field) {
long lsb = transactionManagerId.getLeastSignificantBits();
long msb = transactionManagerId.getMostSignificantBits();
long id = generator.getAndIncrement();
Arrays.fill(field, (byte) 0);
UnsignedNumeric.writeUnsignedLong(field, 0, lsb);
UnsignedNumeric.writeUnsignedLong(field, 10, msb);
UnsignedNumeric.writeUnsignedLong(field, 20, id);
int hash = (int) (lsb ^ lsb >>> 32);
hash = 37 * hash + (int) (msb ^ msb >>> 32);
hash = 37 * hash + (int) (id ^ id >>> 32);
return hash;
}
@Override
public String toString() {
return "DummyXid{" +
", globalTransactionId = " + Util.printArray(globalTransactionId, false) +
", branchQualifier = " + Util.printArray(branchQualifier, false) +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || !(o instanceof Xid)) return false;
Xid other = (Xid) o;
if (other.getFormatId() != 1) return false;
if (!Arrays.equals(branchQualifier, other.getBranchQualifier())) return false;
if (!Arrays.equals(globalTransactionId, other.getGlobalTransactionId())) return false;
return true;
}
@Override
public int hashCode() {
return cachedHashcode;
}
}