de.danet.an.workflow.omgcore
Interface WfRequester

All Superinterfaces:

java.util.EventListener, WfAuditHandler, WfObject

All Known Subinterfaces:

Activity, WfActivity

All Known Implementing Classes:

DefaultRequester

public interface WfRequester

extends WfObject, WfAuditHandler

WfRequester is the interface that has a direct concern with the execution and results of a workflow process. It represents the request for some work to be done. Its performer, a WfProcess is expected to handle its request and communicate significant status changes; in particular to inform the requester when it has completed performing the request work.

The support of WfRequesters in a workflow engine implementation is complicated because the receiveEvent method reverses the client server relationship and because an object from the application space must be stored by the server.

Implementations of WfRequester are therefore subject to the following restrictions:

• The implementation must implement java.io.Serializable. Make sure not to use any attributes that are not serializable.
• In order for deserialization to work, the implementation's class file must be in the classpath of the application server.
• The implementation must provide proper equals and hashCode methods.

Most applications will simply use the requester provided as DefaultRequester.

Method Summary

boolean	isMemberOfPerformers(WfProcess member) Check if the given process is among the performers of this requester.
java.util.Collection	performers() Return all performers associated with this requester.

Methods inherited from interface de.danet.an.workflow.omgcore.WfAuditHandler

receiveEvent

Method Detail

performers

public java.util.Collection performers()
                                throws java.rmi.RemoteException

Return all performers associated with this requester.

Returns:

A collection of associated performers.

Throws:

java.rmi.RemoteException - if a system-level error occurs.

isMemberOfPerformers

public boolean isMemberOfPerformers(WfProcess member)
                             throws java.rmi.RemoteException

Check if the given process is among the performers of this requester.

Parameters:

member - the process in question.

Returns:

true if the process is among the performers of this requester.

Throws:

java.rmi.RemoteException - if a system-level error occurs.