/*

 * Copyright (c) 2000, 2002, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package javax.transaction.xa;

/**

 * The Xid interface is a Java mapping of the X/Open transaction identifier

 * XID structure. This interface specifies three accessor methods to

 * retrieve a global transaction format ID, global transaction ID,

 * and branch qualifier. The Xid interface is used by the transaction

 * manager and the resource managers. This interface is not visible to

 * the application programs.

 *

 * @since 1.4

 */

public interface Xid {

    /**

     * Maximum number of bytes returned by {@link #getGlobalTransactionId }.

     */

    final static int MAXGTRIDSIZE = 64;

    /**

     * Maximum number of bytes returned by {@link #getBranchQualifier }.

     */

    final static int MAXBQUALSIZE = 64;

    /**

     * Obtain the format identifier part of the XID.

     *

     * @return Format identifier. O means the OSI CCR format.

     */

    int getFormatId();

    /**

     * Obtain the global transaction identifier part of XID as an array

     * of bytes.

     *

     * @return Global transaction identifier.

     */

    byte[] getGlobalTransactionId();

    /**

     * Obtain the transaction branch identifier part of XID as an array

     * of bytes.

     *

     * @return Global transaction identifier.

     */

    byte[] getBranchQualifier();

}