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Java example source code file (XAResource.java)

This example Java source code file (XAResource.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

tmendrscan, tmfail, tmjoin, tmnoflags, tmonephase, tmresume, tmstartrscan, tmsuccess, tmsuspend, xa_ok, xa_rdonly, xaexception, xaresource, xid

The XAResource.java Java example source code

/*
 * Copyright (c) 2000, 2001, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.transaction.xa;

/** <p>The XAResource interface is a Java mapping of the industry standard
  * XA interface based on the X/Open CAE Specification (Distributed
  * Transaction Processing: The XA Specification).
  *
  * <p>The XA interface defines the contract between a Resource Manager
  * and a Transaction Manager in a distributed transaction processing
  * (DTP) environment. A JDBC driver or a JMS provider implements
  * this interface to support the association between a global transaction
  * and a database or message service connection.
  *
  * <p>The XAResource interface can be supported by any transactional
  * resource that is intended to be used by application programs in an
  * environment where transactions are controlled by an external
  * transaction manager. An example of such a resource is a database
  * management system. An application may access data through multiple
  * database connections. Each database connection is enlisted with
  * the transaction manager as a transactional resource. The transaction
  * manager obtains an XAResource for each connection participating
  * in a global transaction. The transaction manager uses the
  * <code>start method
  * to associate the global transaction with the resource, and it uses the
  * <code>end method to disassociate the transaction from
  * the resource. The resource
  * manager is responsible for associating the global transaction to all
  * work performed on its data between the start and end method invocations.
  *
  * <p>At transaction commit time, the resource managers are informed by
  * the transaction manager to prepare, commit, or rollback a transaction
  * according to the two-phase commit protocol.</p>
  *
  */

public interface XAResource
{
    /** Commits the global transaction specified by xid.
      *
      * @param xid A global transaction identifier
      *
      * @param onePhase If true, the resource manager should use a one-phase
      * commit protocol to commit the work done on behalf of xid.
      *
      * @exception XAException An error has occurred. Possible XAExceptions
      * are XA_HEURHAZ, XA_HEURCOM, XA_HEURRB, XA_HEURMIX, XAER_RMERR,
      * XAER_RMFAIL, XAER_NOTA, XAER_INVAL, or XAER_PROTO.
      *
      * <P>If the resource manager did not commit the transaction and the
      *  paramether onePhase is set to true, the resource manager may throw
      *  one of the XA_RB* exceptions. Upon return, the resource manager has
      *  rolled back the branch's work and has released all held resources.
      */

    void commit(Xid xid, boolean onePhase) throws XAException;


    /** Ends the work performed on behalf of a transaction branch.
      * The resource manager disassociates the XA resource from the
      * transaction branch specified and lets the transaction
      * complete.
      *
      * <p>If TMSUSPEND is specified in the flags, the transaction branch
      * is temporarily suspended in an incomplete state. The transaction
      * context is in a suspended state and must be resumed via the
      * <code>start method with TMRESUME specified.

* * <p>If TMFAIL is specified, the portion of work has failed. * The resource manager may mark the transaction as rollback-only</p> * * <p>If TMSUCCESS is specified, the portion of work has completed * successfully.</p> * * @param xid A global transaction identifier that is the same as * the identifier used previously in the <code>start method. * * @param flags One of TMSUCCESS, TMFAIL, or TMSUSPEND. * * @exception XAException An error has occurred. Possible XAException * values are XAER_RMERR, XAER_RMFAILED, XAER_NOTA, XAER_INVAL, * XAER_PROTO, or XA_RB*. */ void end(Xid xid, int flags) throws XAException; /** Tells the resource manager to forget about a heuristically * completed transaction branch. * * @param xid A global transaction identifier. * * @exception XAException An error has occurred. Possible exception * values are XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL, or * XAER_PROTO. */ void forget(Xid xid) throws XAException; /** Obtains the current transaction timeout value set for this * XAResource instance. If <CODE>XAResource.setTransactionTimeout * was not used prior to invoking this method, the return value * is the default timeout set for the resource manager; otherwise, * the value used in the previous <CODE>setTransactionTimeout * call is returned. * * @return the transaction timeout value in seconds. * * @exception XAException An error has occurred. Possible exception * values are XAER_RMERR and XAER_RMFAIL. */ int getTransactionTimeout() throws XAException; /** This method is called to determine if the resource manager * instance represented by the target object is the same as the * resouce manager instance represented by the parameter <i>xares. * * @param xares An XAResource object whose resource manager instance * is to be compared with the resource manager instance of the * target object. * * @return <i>true if it's the same RM instance; otherwise * <i>false. * * @exception XAException An error has occurred. Possible exception * values are XAER_RMERR and XAER_RMFAIL. * */ boolean isSameRM(XAResource xares) throws XAException; /** Ask the resource manager to prepare for a transaction commit * of the transaction specified in xid. * * @param xid A global transaction identifier. * * @exception XAException An error has occurred. Possible exception * values are: XA_RB*, XAER_RMERR, XAER_RMFAIL, XAER_NOTA, XAER_INVAL, * or XAER_PROTO. * * @return A value indicating the resource manager's vote on the * outcome of the transaction. The possible values are: XA_RDONLY * or XA_OK. If the resource manager wants to roll back the * transaction, it should do so by raising an appropriate XAException * in the prepare method. */ int prepare(Xid xid) throws XAException; /** Obtains a list of prepared transaction branches from a resource * manager. The transaction manager calls this method during recovery * to obtain the list of transaction branches that are currently in * prepared or heuristically completed states. * * @param flag One of TMSTARTRSCAN, TMENDRSCAN, TMNOFLAGS. TMNOFLAGS * must be used when no other flags are set in the parameter. * * @exception XAException An error has occurred. Possible values are * XAER_RMERR, XAER_RMFAIL, XAER_INVAL, and XAER_PROTO. * * @return The resource manager returns zero or more XIDs of the * transaction branches that are currently in a prepared or * heuristically completed state. If an error occurs during the * operation, the resource manager should throw the appropriate * XAException. * */ Xid[] recover(int flag) throws XAException; /** Informs the resource manager to roll back work done on behalf * of a transaction branch. * * @param xid A global transaction identifier. * * @exception XAException An error has occurred. */ void rollback(Xid xid) throws XAException; /** <P>Sets the current transaction timeout value for this XAResource * instance. Once set, this timeout value is effective until * <code>setTransactionTimeout is invoked again with a different * value. To reset the timeout value to the default value used by the resource * manager, set the value to zero. * * If the timeout operation is performed successfully, the method returns * <i>true; otherwise false. If a resource manager does not * support explicitly setting the transaction timeout value, this method * returns <i>false. * * @param seconds The transaction timeout value in seconds. * * @return <i>true if the transaction timeout value is set successfully; * otherwise <i>false. * * @exception XAException An error has occurred. Possible exception values * are XAER_RMERR, XAER_RMFAIL, or XAER_INVAL. */ boolean setTransactionTimeout(int seconds) throws XAException; /** Starts work on behalf of a transaction branch specified in * <code>xid. * * If TMJOIN is specified, the start applies to joining a transaction * previously seen by the resource manager. If TMRESUME is specified, * the start applies to resuming a suspended transaction specified in the * parameter <code>xid. * * If neither TMJOIN nor TMRESUME is specified and the transaction * specified by <code>xid has previously been seen by the resource * manager, the resource manager throws the XAException exception with * XAER_DUPID error code. * * @param xid A global transaction identifier to be associated * with the resource. * * @param flags One of TMNOFLAGS, TMJOIN, or TMRESUME. * * @exception XAException An error has occurred. Possible exceptions * are XA_RB*, XAER_RMERR, XAER_RMFAIL, XAER_DUPID, XAER_OUTSIDE, * XAER_NOTA, XAER_INVAL, or XAER_PROTO. * */ void start(Xid xid, int flags) throws XAException; /** * Ends a recovery scan. */ public final static int TMENDRSCAN = 0x00800000; /** * Disassociates the caller and marks the transaction branch * rollback-only. */ public final static int TMFAIL = 0x20000000; /** * Caller is joining existing transaction branch. */ public final static int TMJOIN = 0x00200000; /** * Use TMNOFLAGS to indicate no flags value is selected. */ public final static int TMNOFLAGS = 0x00000000; /** * Caller is using one-phase optimization. */ public final static int TMONEPHASE = 0x40000000; /** * Caller is resuming association with a suspended * transaction branch. */ public final static int TMRESUME = 0x08000000; /** * Starts a recovery scan. */ public final static int TMSTARTRSCAN = 0x01000000; /** * Disassociates caller from a transaction branch. */ public final static int TMSUCCESS = 0x04000000; /** * Caller is suspending (not ending) its association with * a transaction branch. */ public final static int TMSUSPEND = 0x02000000; /** * The transaction branch has been read-only and has been committed. */ public final static int XA_RDONLY = 0x00000003; /** * The transaction work has been prepared normally. */ public final static int XA_OK = 0; }

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