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The javax.transaction package. It is appropriate for inclusion in a classpath, and may be added to a Java 2 installation.
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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html or
 * glassfish/bootstrap/legal/CDDLv1.0.txt.
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * Header Notice in each file and include the License file 
 * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
 * If applicable, add the following below the CDDL Header, 
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 */

package javax.transaction;

import javax.transaction.xa.XAResource;
import java.lang.IllegalStateException;
import java.lang.SecurityException;

/**
 * The Transaction interface allows operations to be performed against
 * the transaction in the target Transaction object. A Transaction
 * object is created corresponding to each global transaction creation.
 * The Transaction object can be used for resource enlistment,
 * synchronization registration, transaction completion, and status
 * query operations.
 */

public interface Transaction {

    /**
     * Complete the transaction represented by this Transaction object.
     *
     * @exception RollbackException Thrown to indicate that
     *    the transaction has been rolled back rather than committed.
     *
     * @exception HeuristicMixedException Thrown to indicate that a heuristic
     *    decision was made and that some relevant updates have been committed
     *    while others have been rolled back.
     *
     * @exception HeuristicRollbackException Thrown to indicate that a
     *    heuristic decision was made and that all relevant updates have been
     *    rolled back.
     *
     * @exception SecurityException Thrown to indicate that the thread is
     *    not allowed to commit the transaction.
     *
     * @exception IllegalStateException Thrown if the transaction in the 
     *    target object is inactive.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     */
    public void commit() throws RollbackException,
                HeuristicMixedException, HeuristicRollbackException,
                SecurityException, IllegalStateException, SystemException;

    /**
     * Disassociate the resource specified from the transaction associated 
     * with the target Transaction object.
     *
     * @param xaRes The XAResource object associated with the resource 
     *              (connection).
     *
     * @param flag One of the values of TMSUCCESS, TMSUSPEND, or TMFAIL.
     *
     * @exception IllegalStateException Thrown if the transaction in the
     *    target object is inactive.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     *
     * @return true if the resource was delisted successfully; otherwise
     *	  false.
     *
     */
    public boolean delistResource(XAResource xaRes, int flag)
        throws IllegalStateException, SystemException;

    /**
     * Enlist the resource specified with the transaction associated with the 
     * target Transaction object.
     *
     * @param xaRes The XAResource object associated with the resource 
     *              (connection).
     *
     * @return true if the resource was enlisted successfully; otherwise
     *    false.
     *
     * @exception RollbackException Thrown to indicate that
     *    the transaction has been marked for rollback only.
     *
     * @exception IllegalStateException Thrown if the transaction in the
     *    target object is in the prepared state or the transaction is
     *    inactive.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     *
     */
    public boolean enlistResource(XAResource xaRes)
        throws RollbackException, IllegalStateException,
        SystemException;

    /**
     * Obtain the status of the transaction associated with the target 
     * Transaction object.
     *
     * @return The transaction status. If no transaction is associated with
     *    the target object, this method returns the 
     *    Status.NoTransaction value.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     *
     */
    public int getStatus() throws SystemException;

    /**
     * Register a synchronization object for the transaction currently
     * associated with the target object. The transction manager invokes
     * the beforeCompletion method prior to starting the two-phase transaction
     * commit process. After the transaction is completed, the transaction
     * manager invokes the afterCompletion method.
     *
     * @param sync The Synchronization object for the transaction associated
     *    with the target object.
     *
     * @exception RollbackException Thrown to indicate that
     *    the transaction has been marked for rollback only.
     *
     * @exception IllegalStateException Thrown if the transaction in the
     *    target object is in the prepared state or the transaction is
     *	  inactive.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     *
     */
    public void registerSynchronization(Synchronization sync)
                throws RollbackException, IllegalStateException,
                SystemException;

    /**
     * Rollback the transaction represented by this Transaction object.
     *
     * @exception IllegalStateException Thrown if the transaction in the
     *    target object is in the prepared state or the transaction is
     *    inactive.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     *
     */
	public void rollback() throws IllegalStateException, SystemException;

    /**
     * Modify the transaction associated with the target object such that
     * the only possible outcome of the transaction is to roll back the
     * transaction.
     *
     * @exception IllegalStateException Thrown if the target object is
     *    not associated with any transaction.
     *
     * @exception SystemException Thrown if the transaction manager
     *    encounters an unexpected error condition.
     *
     */
    public void setRollbackOnly() throws IllegalStateException,
        SystemException;

}