Query HistoryService for task assignee and name?
I am using jBPM 4.1 and tried to write a unit test that queries the history service using the task assignee and name.
First i looked at the sources of jBPM and searched for tests that are performing a similar query. Unfortunately the only test related to history task assignee was org.jbpm.test.history.HistoryTaskAssigneeTest shown below and the test didn't use the assignee information to perform the query:
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package org.jbpm.test.history;
import org.jbpm.api.Execution;
import org.jbpm.api.history.HistoryActivityInstance;
import org.jbpm.test.JbpmTestCase;
/**
* @author Tom Baeyens
*/
public class HistoryTaskAssigneeTest extends JbpmTestCase {
public void testHistoryTaskAssignee() {
deployJpdlXmlString(
"<process name='TaskAssignee'>" +
" <start>" +
" <transition to='review' />" +
" </start>" +
" <task name='review' " +
" assignee='johndoe'>" +
" <transition to='wait' />" +
" </task>" +
" <state name='wait'/>" +
"</process>"
);
executionService.startProcessInstanceByKey("TaskAssignee");
HistoryActivityInstance historyActivityInstance = historyService
.createHistoryActivityInstanceQuery()
.uniqueResult();
}
}
The current implementation of the HistoryTaskQuery allows querying using the assignee but not the name of the task. To find out the name for the task i decided to make a HistoryActivityInstanceQuery using the executiondid that will be delivered by the HistoryTaskQuery. To my surprise this didn't work. The HistoryActivityInstanceQuery delivered 3 HistoryActivityInstances instead of 1. So it is not possible to figure out the name of the task that was performed by the assignee. The unit test is shown below:
package com.cg.wfl.jbpm.examples.wfl_examples.history;
import java.util.List;
import org.jbpm.api.Execution;
import org.jbpm.api.history.HistoryActivityInstance;
import org.jbpm.api.history.HistoryTask;
import org.jbpm.test.JbpmTestCase;
public class HistoryTaskAssigneeTest extends JbpmTestCase {
public void testHistoryTaskAssignee() {
deployJpdlXmlString(
"<process name='TaskAssigneeTest'>" +
" <start>" +
" <transition to='a' />" +
" </start>" +
" <task name='a' assignee='mary'>" +
" <transition name='toB' to ='b' />" +
" </task>" +
" <task name='b' assignee='alex'>" +
" <transition name='toC' to ='c' />" +
" </task>" +
" <task name='c' assignee='mary'>" +
" <transition name='toEnd' to ='end' />" +
" </task>" +
" <end name='end' />" +
"</process>"
);
Execution execution = executionService.startProcessInstanceByKey("TaskAssigneeTest");
String taskId = taskService.createTaskQuery().uniqueResult().getId();
taskService.completeTask(taskId);
taskId = taskService.createTaskQuery().uniqueResult().getId();
taskService.completeTask(taskId);
taskId = taskService.createTaskQuery().uniqueResult().getId();
taskService.completeTask(taskId);
assertNull("execution "+execution.getId()+" should not exist",
executionService.findExecutionById(execution.getId()));
List<HistoryTask> historyTasks = historyService.createHistoryTaskQuery().
assignee("mary").list();
assertEquals(2, historyTasks.size());
historyTasks = historyService.createHistoryTaskQuery().
assignee("alex").list();
assertEquals(1, historyTasks.size());
// Try to find out the name of the task for the first task with assignee mary
String executionId = historyTasks.get(0).getExecutionId();
List<HistoryActivityInstance> historyActivities = historyService.createHistoryActivityInstanceQuery().
executionId(executionId).list();
// The expectation is 1 entry in the list, but the list contains 3 entries
// It is not possible to link the HistoryTask to the HistoryActivityInstance
// using the executionId!
assertEquals(1, historyActivities.size());
}
}
I found also the following jira issues that references task history details and hope that the problem with the task name will be also considered.
https://jira.jboss.org/jira/browse/JBPM-2442
Any help or comments are welcomed.
