OFBiz workflow source code learning (1)-wfrequester Interface

Wfrequester interface and implementation

The wfrequester interface is an interface that has a direct relationship with the execution and results of workflow flows. It represents a request for the work to be done.

 

Knowledge Point: wfrequesterExtends mer OF THE INTERFACEIs wfprocess,A wfrequesterInterface can correspond to several wfprocess

Sample Code:

Protected map export MERs = NULL;

This. Merge MERs = new hashmap (); // constructs the map of proces and requester.

Schedulmers. Put (process, requester); // registerprocess () registers process for requester

The following method is related to the Timer:

/**

* @ See org. OFBiz. Core. workflow. wfrequester # howmanyperformer ()

* Obtain the size of the timer.

*/

Public int howmanypolicmer () throws wfexception {

Return radimers. Size ();

}

/**

* @ See org. OFBiz. Core. workflow. wfrequester # getiteratorperformer ()

* Get the timer iterator

*/

Public iterator getiteratorperformer () throws wfexception {

Return radimers. keyset (). iterator ();

}

/**

* @ See org. OFBiz. Core. workflow. wfrequester # getsequenceperformer (INT)

* Get the sort Mer In the list form

*/

Public list getsequenceperformer (INT maxnumber) throws wfexception {

If (maxnumber> 0)

Return new arraylist (sort MERs. keyset (). sublist (0, (maxnumber-1 ));

Return new arraylist (sort MERs. keyset ());

}

 

 

Knowledge Point: wfrequesterThe interface is often used to start the process.Object Interface

As a process starter, it usually does three things:

1) Setting up the context

2) start the process

3) Get the status and results

 

Knowledge Point: wfrequesterInterface and wfprocessGenerally, there are two application scenarios:

1) workflow process evolution: in this case, wfactiworkflow is refined into wfrequester, so that it has a executor wfprocess. When wfprocess executes a request, it executes an activity.

2) wfrequester connects wfprocess to other applications.

 

Knowledge Point: wfprocessGenerally, void receiveevent (wfeventaudit event) is used)Method) Notification to request

When an activity is completed, interrupted, or aborted, the requester must be notified.

Sample Code:

/**

* @ See org. OFBiz. Core. workflow. wfrequester # receiveevent ()

*/

Public synchronized void receiveevent (wfeventaudit event) throws wfexception, invalidperformer {

// Shocould the source of the audit come from the process? If so use this.

Wfprocess process = NULL;

 

Try {

Process = (wfprocess) event. Source (); // The event is from process

} Catch (sourcenotavailable SNA ){

Throw new invalidpolicmer ("cocould not get the specified mer", SNA );

} Catch (classcastexception CCE ){

Throw new invalidperformer ("not a valid process object", CCE );

}

// If the event source is not the process associated with the requester, an exception is thrown.

If (process = NULL)

Throw new invalidperformer ("No timer mer specified ");

If (! Extends MERs. containskey (process ))

Throw new invalidperformer ("timer mer not assigned to this requester ");

 

Genericrequester Req = NULL;

// If the event source is a process associated with requester, the status and result are obtained.

If (sort MERs. containskey (process ))

Req = (genericrequester) reducers. Get (process );

If (req! = NULL)

Req. receiveresult (process. Result ());

}