Querying Oracle BPM Process Instances

THURSDAY, JULY 14, 2011

Querying Oracle BPM Process Instances

This is the first in a series of posts related to the BPM 11g Java API. As far as I know, as of this writing, there is no official Oracle BPM 11g Java API documentation that is being release yet, but the corresponding jars are already present on a standard
JDeveloper installation (probably after installing BPM Extension).

The purpose of this post is to show simple runnable classes so readers can easily have an acquintance with the BPM 11g APIs, without needing to setup a complex web project.

We can manipulate BPM processes through a BPMServiceClient that we can acquire from a BPMServiceClientFactory. Below is a utility class that I set to easily acquire a client instance for my testing. This class need the following jars in the classpath: Oracle.bpm.client.jar,
Oracle.bpm.project.model.jar, and Oracle.bpm.runtime.jar which are present inside the BPM folders in "MIDDLEWARE_HOME\jdeveloper\soa\modules" directory. 

package soadev.bpmclient;

import java.util.HashMap;
import java.util.Map;

import oracle.bpel.services.bpm.common.IBPMContext;
import oracle.bpel.services.workflow.client.IWorkflowServiceClient;
import oracle.bpel.services.workflow.client.IWorkflowServiceClientConstants;
import oracle.bpel.services.workflow.client.WorkflowServiceClientFactory;

import oracle.bpm.client.BPMServiceClientFactory;
import oracle.bpm.services.client.IBPMServiceClient;

public class Fixture {
private static String url = "t3://localhost:8001";

public static BPMServiceClientFactory getBPMServiceClientFactory() {
Map<IWorkflowServiceClientConstants.CONNECTION_PROPERTY, String> properties =
new HashMap<IWorkflowServiceClientConstants.CONNECTION_PROPERTY, String>();

properties.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY.CLIENT_TYPE,
WorkflowServiceClientFactory.REMOTE_CLIENT);
properties.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY
.EJB_PROVIDER_URL,url);
properties.put(IWorkflowServiceClientConstants.CONNECTION_PROPERTY
.EJB_INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
return BPMServiceClientFactory.getInstance(properties, null, null);
}

public static IBPMContext getIBPMContext(String username,
String password) throws Exception{
return getBPMServiceClientFactory().getBPMUserAuthenticationService()
.authenticate(username,
password.toCharArray(),
null);
}

public static IWorkflowServiceClient getIWorkflowServiceClient() {
return getBPMServiceClientFactory().getWorkflowServiceClient();
}

public static IBPMServiceClient getBPMServiceClient(){
return getBPMServiceClientFactory().getBPMServiceClient();
}
}

Below is a sample class that demonstrate querying of BPM process instances. It shows how to compose Predicate, Ordering, and IInstanceQueryInput objects. 

package soadev.bpmclient;

import java.util.ArrayList;
import java.util.List;

import oracle.bpel.services.bpm.common.IBPMContext;
import oracle.bpel.services.workflow.repos.Column;
import oracle.bpel.services.workflow.repos.Ordering;

import oracle.bpel.services.workflow.repos.Predicate;
import oracle.bpm.services.instancemanagement.model.IProcessInstance;
import oracle.bpm.services.instancequery.IColumnConstants;
import oracle.bpm.services.instancequery.IInstanceQueryInput;
import oracle.bpm.services.instancequery.IInstanceQueryService;
import oracle.bpm.services.instancequery.impl.InstanceQueryInput;

public class GetProcessInstances {

public static void main(String[] args) {
GetProcessInstances client = new GetProcessInstances();
client.testGetProcessInstances();
}

public void testGetProcessInstances(){
try {
IInstanceQueryService queryService =
Fixture.getBPMServiceClient().getInstanceQueryService();
IBPMContext bpmContext =
Fixture.getIBPMContext("pino", "password1");
List<Column> columns = new ArrayList<Column>();
columns.add(IColumnConstants.PROCESS_ID_COLUMN);
columns.add(IColumnConstants.PROCESS_NUMBER_COLUMN);
columns.add(IColumnConstants.PROCESS_STATE_COLUMN);
columns.add(IColumnConstants.PROCESS_TITLE_COLUMN);
columns.add(IColumnConstants.PROCESS_CREATOR_COLUMN);
columns.add(IColumnConstants.PROCESS_CREATEDDATE_COLUMN);

Ordering ordering = new Ordering(IColumnConstants.PROCESS_NUMBER_COLUMN,
true,true);
Predicate pred = new Predicate(IColumnConstants.PROCESS_STATE_COLUMN,
Predicate.OP_EQ,
"OPEN");
IInstanceQueryInput input = new InstanceQueryInput();
input.setAssignmentFilter(IInstanceQueryInput.AssignmentFilter.MY_AND_GROUP);

List<IProcessInstance> processInstances =
queryService.queryInstances(bpmContext, columns, pred, ordering,
input);
System.out.println("ProcessId\tProcess#\tState\tTitle\t\t\t\t\tCreator\tCreadedDate");
for (IProcessInstance instance : processInstances) {
System.out.println(instance.getSystemAttributes().getProcessInstanceId()
+ "\t" + instance.getSystemAttributes()
.getProcessNumber()
+ "\t" + instance.getSystemAttributes().getState()
+ "\t" + instance.getTitle()
+ "\t" + instance.getCreator()
+ "\t" + instance.getSystemAttributes()
.getCreatedDate().getTime());
}
if (processInstances.isEmpty()){
System.out.println("no result");
}
} catch (Exception e) {
// TODO: Add catch code
e.printStackTrace();
}
}
}

Below is a sample result when I run it on my machine: 




You can access the sample application on this link. 

Kudus

Kudus to the following blogs and OTN forum posts: 
RedStack-Process Instance List and Detail added to Worklist -for showing the right source
of Column constants (IColumnConstants instead of the TableConstants constants).
Matt Wang - Find something interesting today - for I guess starting it up.

Cheers!