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package javax.transaction;

/**
 *  This interface allows an application to explicitly manage transactions.
 *
 *  @version $Revision$
 */
public interface UserTransaction
{
    /**
     *  Starts a new transaction, and associate it with the calling thread.
     *
     *  @throws NotSupportedException If the calling thread is already
     *          associated with a transaction, and nested transactions are
     *          not supported.
     *  @throws SystemException If the transaction service fails in an
     *          unexpected way.
     */
    public void begin() throws NotSupportedException, SystemException;

    /**
     *  Commit the transaction associated with the calling thread.
     *
     *  @throws RollbackException If the transaction was marked for rollback
     *          only, the transaction is rolled back and this exception is
     *          thrown.
     *  @throws IllegalStateException If the calling thread is not associated
     *          with a transaction.
     *  @throws SystemException If the transaction service fails in an
     *          unexpected way.
     *  @throws HeuristicMixedException If a heuristic decision was made and
     *          some some parts of the transaction have been committed while
     *          other parts have been rolled back.
     *  @throws HeuristicRollbackException If a heuristic decision to roll
     *          back the transaction was made.
     *  @throws SecurityException If the caller is not allowed to commit this
     *          transaction.
     */
    public void commit() throws RollbackException, HeuristicMixedException,
                   HeuristicRollbackException, SecurityException,
                   IllegalStateException, SystemException;

    /**
     *  Rolls back the transaction associated with the calling thread.
     * 
     *  @throws IllegalStateException If the transaction is in a state
     *          where it cannot be rolled back. This could be because the
     *          calling thread is not associated with a transaction, or
     *          because it is in the
     *          {@link Status#STATUS_PREPARED prepared state}.
     *  @throws SecurityException If the caller is not allowed to roll back
     *          this transaction.
     *  @throws SystemException If the transaction service fails in an
     *          unexpected way.
     */
    public void rollback() throws IllegalStateException, SecurityException,
                   SystemException;

    /**
     *  Mark the transaction associated with the calling thread for rollback
     *  only.
     * 
     *  @throws IllegalStateException If the transaction is in a state
     *          where it cannot be rolled back. This could be because the
     *          calling thread is not associated with a transaction, or
     *          because it is in the
     *          {@link Status#STATUS_PREPARED prepared state}.
     *  @throws SystemException If the transaction service fails in an
     *          unexpected way.
     */
    public void setRollbackOnly() throws IllegalStateException, SystemException;

    /**
     *  Get the status of the transaction associated with the calling thread.
     *
     *  @return The status of the transaction. This is one of the
     *          {@link Status} constants. If no transaction is associated
     *          with the calling thread,
     *          {@link Status#STATUS_NO_TRANSACTION} is returned. 
     *
     *  @throws SystemException If the transaction service fails in an
     *          unexpected way.
     */
    public int getStatus() throws SystemException;

    /**
     *  Change the transaction timeout for transactions started by the calling
     *  thread with the {@link #begin()} method.
     *
     *  @param seconds The new timeout value, in seconds. If this parameter
     *         is 0, the timeout value is reset to the default
     *         value.
     *
     *  @throws SystemException If the transaction service fails in an
     *          unexpected way.
     */
    public void setTransactionTimeout(int seconds) throws SystemException;
}