topic Re: how to get candidate group info for the next task in Alfresco Archive

how to get candidate group info for the next task

gokhan — Tue, 28 Feb 2012 16:11:42 GMT

Hi everbodyI am new to Activiti, and in our project we need to assign some tasks to users at runtime. So i need to fill a combobox with userIDs in a task form, and assign userID to the next task in next task's create listener event.In order to fill the combobox with userIDs i need to get candidate g

Re: how to get candidate group info for the next task

yz250 — Mon, 23 Apr 2012 12:53:43 GMT

I' m looking for the same thing, I have to fill a combobox with all users of a group, then the initiator of the process can choose the user who will do the next task.

Thanks, Ivan.

Re: how to get candidate group info for the next task

trademak — Tue, 24 Apr 2012 09:53:40 GMT

Hi,

When you query the Activiti Engine for process definitions you get back an List<ProcessDefinition>
But this actually is a ProcessDefinitionEntity, and this class contains the parsed task information of that process.
Note however that this is no public API and this can change in feature releases.

Best regards,

Re: how to get candidate group info for the next task

ronald_van_kuij — Tue, 24 Apr 2012 19:49:07 GMT

But you still have to know what the next task will be… If there are gateways in between with constraints on the sequenceflows, it can be hard to determine.

Re: how to get candidate group info for the next task

nils1 — Wed, 09 May 2012 21:14:56 GMT

Here is the API call you can use to get the candidate groups for a task:

List<IdentityLink> idLinks = taskService.getIdentityLinksForTask("YOUR TASK ID");

Cheers,
Nils

Re: how to get candidate group info for the next task

pprikryl — Tue, 21 May 2013 12:22:07 GMT

I used above method, but it was slowly. I tried to load all tasks and it tooks minute. So I Implemented this helper class. It is not perfect, but it fits for me:
<code>
private static class IdentityCache {
        private final Map<String, ProcessDefinitionEntity> processDefinitions = Maps.newHashMap();
        private final RepositoryService                    repositoryService;

        public IdentityCache(RepositoryService repositoryService) {
            this.repositoryService = repositoryService;
        }

        public List<String> getCandidateUsers(org.activiti.engine.task.Task task) {
            List<String> ret = Lists.newLinkedList();
            ProcessDefinitionEntity processDefinition = getProcessDefinition(task.getProcessDefinitionId());
            Set<Expression> candidateUserIdExpressions = processDefinition.getTaskDefinitions().get(task.getTaskDefinitionKey()).getCandidateUserIdExpressions();
            for (Expression expression : candidateUserIdExpressions) {
                ret.add(expression.getExpressionText());
            }
            return ret;
        }

        private ProcessDefinitionEntity getProcessDefinition(String processDefinitionId) {
            ProcessDefinitionEntity processDefinition = processDefinitions.get(processDefinitionId);
            if (processDefinition == null) {
                ProcessDefinitionEntity loadedProcessDefinition = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(processDefinitionId);
                processDefinitions.put(processDefinitionId, loadedProcessDefinition);
                processDefinition = loadedProcessDefinition;
            }
            return processDefinition;
        }

        public List<String> getCandidateGroups(org.activiti.engine.task.Task task) {
            List<String> ret = Lists.newLinkedList();
            ProcessDefinitionEntity processDefinition = getProcessDefinition(task.getProcessDefinitionId());
            Set<Expression> candidateUserIdExpressions = processDefinition.getTaskDefinitions().get(task.getTaskDefinitionKey()).getCandidateGroupIdExpressions();
            for (Expression expression : candidateUserIdExpressions) {
                ret.add(expression.getExpressionText());
            }
            return ret;
        }

    }
</code>