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   * JBoss, Home of Professional Open Source
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  * (C) 2005-2006,
  * @author JBoss Inc.
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  * Arjuna Technologies Limited,
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  * $Id:,v 2005/11/22 10:36:05 kconner Exp $
This is the interface that the core exposes in order to allow different types of participants to be enrolled. The messaging layer continues to work in terms of the registrar, but internally we map to one of these methods. As with UserTransaction a TransactionManager does not represent a specific transaction, but rather is responsible for providing access to an implicit per-thread transaction context.

Mark Little (
$Id:,v 2005/11/22 10:36:05 kconner Exp $
XTS 1.0.
 public abstract class BusinessActivityManager
The manager.
     private static BusinessActivityManager MANAGER ;
Get the business activity manager.

The business activity manager.
     public static synchronized BusinessActivityManager getBusinessActivityManager()
         return  ;
Set the business activity manager.

manager The business activity manager.
     public static synchronized void setBusinessActivityManager(final BusinessActivityManager manager)
          = manager ;

Enlist a participant for the BusinessAgreement protocol.

the BAParticipantManager for this transaction.
         final BusinessAgreementWithParticipantCompletionParticipant bapfinal String id)
Enlist a participant for the BusinessAgreementWithCoordinatorCompletion protocol.

the BAParticipantManager for this transaction.
         final BusinessAgreementWithCoordinatorCompletionParticipant bawcpfinal String id)
The resume method can be used to (re-)associate a thread with a transaction(s) via its TxContext. Prior to association, the thread is disassociated with any transaction(s) with which it may be currently associated. If the TxContext is null, then the thread is associated with no transaction. The UnknownTransactionException exception is thrown if the transaction that the TxContext refers to is invalid in the scope of the invoking thread.
    public abstract void resume(final TxContext txContext)
        throws UnknownTransactionExceptionSystemException;

A thread of control may require periods of non-transactionality so that it may perform work that is not associated with a specific transaction. In order to do this it is necessary to disassociate the thread from any transactions. The suspend method accomplishes this, returning a TxContext instance, which is a handle on the transaction. The thread is then no longer associated with any transaction.
    public abstract TxContext suspend()
        throws SystemException;
The currentTransaction method returns the TxContext for the current transaction, or null if there is none. Unlike suspend, this method does not disassociate the current thread from the transaction(s). This can be used to enable multiple threads to execute within the scope of the same transaction.
    public abstract TxContext currentTransaction()
        throws SystemException;
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