/*
* (C) 2007-2012 Alibaba Group Holding Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
* See the License for the specific language governing permissions and
* limitations under the License.
* Authors:
* wuhua <wq163@163.com> , boyan <killme2008@gmail.com>
*/
package com.taobao.metamorphosis.server.utils;
import java.util.Random;
import com.taobao.metamorphosis.transaction.XATransactionId;
/**
* ����xid�Ĺ����࣬�����ڲ���
*
* @author boyan(boyan@taobao.com)
* @date 2011-8-24
*
*/
public class XIDGenerator {
public static final String UNIQUE_QUALIFIER = "unique-qualifier";
private final static Random rand = new Random();
private static byte[] randomBytes() {
final byte[] bytes = new byte[rand.nextInt(100)];
rand.nextBytes(bytes);
return bytes;
}
public static XATransactionId createXID(final int formatId, String uniqueQualifier) {
final byte[] branchQualifier = randomBytes();
final byte[] globalTransactionId = randomBytes();
final XATransactionId xid =
new XATransactionId(formatId, branchQualifier, globalTransactionId, uniqueQualifier);
return xid;
}
public static XATransactionId createXID(final int formatId) {
return createXID(formatId, UNIQUE_QUALIFIER);
}
}