OFBiz workflow source code learning (4)-wfprocess Interface

Wfprocess Interface

Wfprocess is the executor of a workflow request. All workflow objects that execute the work implement this interface, which allows the work to be completed asynchronously and monitored and controlled at the same time. When wfprocess is generated, it enters the open. not_running.not_started state. When it completes processing successfully, it enters the closed. Completed state. Exploitation

The change_state () method provided by wfexecutionobject can change other States of wfprocess. Wfprocess is a type of wfexecutionobject, as shown in the following code:

Public String executionobjecttype (){

Return "wfprocess"; // type: wfprocess

}

 

Process environment and Result

Generally, when the wfprocessmgr factory is used to generate a process, its environment has been set up. The wfprocess environment contains three types of information: process-related data, resources to be used, and results generated by the process. After the process starts, whether the process environment can be modified depends on the implementation of different WFM. The process result evolved from the process environment. It also depends on activities contained in the process. It may return a null value. The sample code is as follows:

Public synchronized void receiveresults (wfacti1_activity, map results) throws wfexception, invaliddata {

Map context = processcontext ();

Context. putall (results );

Setserializeddata (context );

}

 

Process requester

When a process is generated by wfprocessmgr, it is associated with a wfrequester, which may be an activity or an external customer. A process always has a requestor. OFBiz allows a process to be reassigned to a requestor.

By calling the receive_event () method of the requester, the process can notify the requester of its status changes and other information.

 

Process steps

One wfprocess has zero to multiple wfactixes, and wfactixes represent the steps to be executed in one wfprocess.

Wfactisource is assigned to wfresource, or is converted into a requester to generate a new process as a sub-process.

The sample code is as follows:

Public list getsequencestep (INT maxnumber) throws wfexception {

If (maxnumber> 0)

Return new arraylist (activesteps (). sublist (0, maxnumber-1 ));

Return activesteps ();

}

 

Process Monitoring

The START () method can start the process. Before it is completed, it can also be suincluded, resumed, terminated, and aborted. Of course, most methods are implemented by implementing the wfexecutionobject interface.

Result () is used to obtain the result data of the current process. When the status of the process changes, it sends a status change event to the requester to notify the requester of the status change.