The Beginners, developers, developing java/J2ee applications to consume the features available in SAP Netweaver Business Process Management 7.3 EHP1
This document details on usage BPM Java API’s to initiate a process, capturing process and task level details, nominating the task to users and Process visualization
Author: Vibha Sharma
Create on : 16-May-2013
Need to use BPM Java API’s
Important point to think about usage of BPM Java API before starting working on it is why we need to use them when we are able to work with out them. The answer to this question is very simple and straight forward, usage of API provides more control and flexibility.
- User has appropriate rights to perform operation using BPM Java API’s
- The version on netweaver is compatible
- Process is already build and deployed on server
- Development component where the API’s will be used should have dependency of tc/bpem/façade/ear
Please Note: Task statistics are available only from SAP NW EHP1 SP06.In this document we will be discussing about their (BPM Java API’s) usage in
- Initiating Process
- Capturing process and task level details
- Nominating the task to different users
- Process Visualization
1. Initiating Process: Its about starting a process using Java API’s. Please find below the steps detail along with sample code
Step 1: In order to fetch the process definitions of active processes we need ProcessDefinitionManager Interface. It can be fetched using BPMFactory
ProcessDefinitionManager processDefinitionManager = BPMFactory.getProcessDefinitionManager();
Step 2: Next Step will be fetching the active process definition using ProcessDefinitionManager
ProcessDefinition processDefinition = processDefinitionManager.getActiveProcessDefinition(“x.com”, “vendor~create~bpm”, “Vendor Create Process”);
Step 3: For getting the ProcessStartEvent via which we can actually initiate the process we need ProcessStartManager.
Hence next step is to get ProcessStartManager
ProcessStartManager processStartManager= BPMFactory.getProcessStartManager();
Step 4: Using ProcessStartManager we can get ProcessStartEvent Set
Set<ProcessStartEvent> processStartEventSet = processStartManager.getProcessStartEvents(processDefinition.getId());
Step 5: Creating Data Object
ProcessStartEvent processStartEvent = processStartEventSet.iterator().next();
DataObject dataObject = processStartManager.createDataObjectForStartEvent(processStartEvent);
Values can be set to this dataObject
Step 6: Finally initiating the process
URI processInstanceURI = processStartManager.startProcess(processStartEvent, dataObject);
2. Capturing process and task level details
Once the process is triggered the task gets created as per process design. Via using BPM API’s we can fetch the task level details as well. Please find below steps involved along with sample code
Step1: Creating Process URI using create command
URI processInstanceURI = URI.create(“bpm://bpm.sap.com/processs-instance/”+ String Process InstanceId);
Step2: Creating result set having the status of the task that we want to fetch
Set<Status> taskStatus = new HashSet<Status>();
Please Note: Suspended and Failed status are not supported
Step3: Fetching task Instance Manager Object
TaskInstanceManager taskInstanceManager = BPMFactory.getTaskInstanceManager();
Step4: Fetching Abstract tasks using Task Instance Manager supplying the result set status and process Instance Id as parameter
Set<TaskAbstract> abstractTaskSet = taskInstanceManager.getTaskAbstractsByParent(processInstanceURI, taskStatus);
Step5: Looping through the taskAbstract set and fetching all the task corresponding to the process Instance URL and status supplied as parameter.
From these task, task related information can be retrieved like Task Name, Task Status, Actual Owner, Potential Owner, Start Time etc.
Context related details can also be fetched from the task using api getInputDataObject and getOutPutDataObject
3. Nominating the task to different user
Several times there comes a requirement where in we need to nominate a different user than the one actually owning the task this functionality can also be achieved via BPM Java API’s
For this we can use the task instance Id fetched in previous step and Iuser object in nominate method of taskInstanceManager
TaskInstanceManager.nominate(URI taskInstanceId, IUser newOwner);
4. Process Visualization
Along with having task details in textual format we have option to visualize the process design and the current status of the process, in SAP BPM terminology well known as Process Visualization.
This is simplest task among all. This can be achieved using command
generateProcessInstanceVisualizationURL on ProcessInstanceManager Object
ProcessInstanceManager processInstanceManager ;
processInstanceManager = BPMFactory.getProcessInstanceManager();
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