com.arjuna.mw.wsas.activity

Interface HLS

All Known Subinterfaces:

SagasHLS, TwoPhaseHLS

All Known Implementing Classes:

SagasHLSImple, TwoPhaseHLSImple

public interface HLS

An HLS is registered with activities to be informed of their lifecycle and to augment the basic notion of what an activity is. Currently each HLS is registered globally so that all activities on all threads know about them. However, we may want to have finer granularity such that an HLS may only be registered with a specific thread.

Since:

1.0.

Version:

$Id: HLS.java,v 1.2 2005/05/19 12:13:16 nmcl Exp $

Author:

Mark Little (mark.little@arjuna.com)

Method Summary

Modifier and Type	Method and Description
void	begun() An activity has begun and is active on the current thread.
Outcome	complete(CompletionStatus cs) The current activity is completing with the specified completion status.
void	completed() The activity has completed and is still active on the current thread.
Context	context() Return the context augmentation for this HLS, if any on the current activity, i.e., the activity active on the current thread.
String	identity() The HLS name.
int	priority() The activity service maintains a priority ordered list of HLS implementations.
void	resumed() The activity has been resumed on the current thread and is active on that thread.
void	suspended() The activity is being suspended, but is still active on the current thread.

Method Detail

begun

void begun()
    throws SystemException

An activity has begun and is active on the current thread.

Throws:

SystemException - Thrown if an error occurs. Any error will cause the activity to be failed.

complete

Outcome complete(CompletionStatus cs)
          throws SystemException

The current activity is completing with the specified completion status.

Parameters:

cs - The completion status to use.

Returns:

The result of terminating the relationship of this HLS and the current activity.

Throws:

SystemException - Thrown if an error occurs. Any error will cause the activity to be failed.

suspended

void suspended()
        throws SystemException

The activity is being suspended, but is still active on the current thread.

Throws:

SystemException

resumed

void resumed()
      throws SystemException

The activity has been resumed on the current thread and is active on that thread.

Throws:

SystemException

completed

void completed()
        throws SystemException

The activity has completed and is still active on the current thread.

Throws:

SystemException

identity

String identity()
         throws SystemException

The HLS name.

Throws:

SystemException

priority

int priority()
      throws SystemException

The activity service maintains a priority ordered list of HLS implementations. If an HLS wishes to be ordered based on priority then it can return a non-negative value: the higher the value, the higher the priority and hence the earlier in the list of HLSes it will appear (and be used in).

Returns:

a positive value for the priority for this HLS, or zero/negative if the order is not important.

Throws:

SystemException

context

Context context()
         throws SystemException

Return the context augmentation for this HLS, if any on the current activity, i.e., the activity active on the current thread.

Returns:

a context object or null if no augmentation is necessary.

Throws:

SystemException