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Tasks make collaboration better. Tasks are better than messages when you work together with others. Tasks have a clear status and an assignee. You can go to the Tasks app to claim a task for yourself and start work on it. 

Magnolia uses tasks in the publishing workflow: when an editor publishes a page the system creates an approval task and sends it to the publishers group.

See also Custom tasks and User tasks documentation for how to integrate it with jBPM. But please keep in mind, that you can create and work with Tasks without having to deal with jBPM and workflow.

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TasksManager

A task is an object that you create using the 

When working with tasks, use the TasksManager class which takes care of updating fields such as creationDate, modificationDate and status and notifies the system event bus.

To get TasksManager in your implementations, use injection:

@Inject
public MyClass(TasksManager tasksManager) {
	this.tasksManager = tasksManager;
}

public void createTask() {
    Task task = new Task();
    ...
	tasksManager.addTask(task);
}

task.setId(String);

Creating a task

Start by giving the task a name. The name is unique for the type of task you are creating and acts as a reference to the task definition in the registry.

task.setname("getGroceries")

Next, define the possible assignees for the task. You can send a task to a list of groups or actors.

List<String> actorIds = new ArrayList() {{
       add("eric");
       add("susan");
    }};
List<String> groupIds = new ArrayList() {{
       add("groceryShoppers");
    }};

task.setActorIds(actorIds);
task.setGroupIds(groupIds);

Finally, add content to your task. The content should contain the information the assignee needs to complete the task. For example, in the default publishing workflow the content contains information the publisher needs to review a page and publish it such as the workspace where the page resides, a path to the page node, and the version of the page being published.

Map<String, String> content = new HashMap() {{
            put("groceries", "milk, eggs, beer");
            put("budget", "15.- CHF");
        }};

task.setContent(content);

Claiming a task

When a user assigns a task to themselves they claim it. To claim a task, set the actorId:

taskManager.claim(taskId, userId);

This will update the task status and modificationDate and notifies the system event bus.

Magnolia uses info.magnolia.ui.admincentral.shellapp.pulse.task.action.ClaimTaskAction inside the Tasks app for this step.

Reclaiming a task

With appropriate publication rights you can reclaim a task which is already InProgress from another user.

Task reclaiming works in the same way as claiming a task, i.e.

taskManager.claim(taskId, userId);

using the info.magnolia.ui.admincentral.shellapp.pulse.task.action.ClaimTaskActionDefinition class but adds notifyPreviousAssignee , which is set to true by default and will trigger sending an i18n-able notification in the Tasks app to the previous assignee in the publication sequence that the task has been reclaimed by another user:

messagesManager.sendMessage(task.getActorId(), message)

Please note that notifyPreviousAssignee is present also in info.magnolia.ui.admincentral.shellapp.pulse.task.action.ClaimTasksActionDefinition .

Resolving a task

To resolve a task assigned to an actor:

Map<String, Object> result = new HashMap<String, Object>();
result.put("budgetSpent", "13.25 CHF");

taskManager.resolve(taskId, result);

A resolved task usually produces some sort of output. You can use the result map to pass this output to further processing. TasksManager will take care of notifying any handlers registered to the system event bus.

Magnolia uses info.magnolia.ui.admincentral.shellapp.pulse.task.action.ResolveTaskAction inside the Tasks app for this step. It allows you to define a decision inside the configuration which is mainly used for approving or rejecting a publication.

After resolving the task using the ResolveTask action the result map contains only one entry with the configured decision.

Archiving and removing a task

The TasksManager provides a method for archiving tasks. The method removes the task from the Tasks app. You can still retrieve an archived task later in case you want to re-open it or audit.

While the API allows deleting a task, we strongly discourage doing so unless you know for sure that the deleted task won't be used any more.

taskManager.archiveTask(taskId);

taskManager.removeTask(taskId);

Status

Every task is bound to a life cycle and transitions back and forth between statuses as it proceeds in your process:

• Created : The Task has been created but is not assigned to any actor.
• InProgress : The task has been assigned to a user
• Resolved : The task has been resolved by the assigned actor.
• Failed : The execution of the task has failed.
• Archived : The task has been removed from the Tasks app.
• Removed : The task has been removed from the repository. Removing tasks is supported by the API but should be used carefully. Depending on the use case, a user should be able to re-open a task after it has been resolved.

Changes to task status can be tracked by registering a 

Task definition

Every task type needs a unique name. The name is used to read the task definition from the task registry in your module configuration.

The simplest

As with any definition used in Magnolia, you can define your own extensions to the task definition and add configurable nodes and properties. This is especially useful in combination with a custom task presenter for putting together the detail view.

Task view

Use a message view configuration to define which fields of the task object are displayed to the user. You can use a dot notation such as content.groceries to reference fields from the content or result map. In the same fashion, you can configure your actions, including availability and action bar mappings.

Task presenter

A task presenter is started when a user opens a task to see its details. The presenter builds the form and action bar which are displayed to the user in the browser. Magnolia provides a 

Most likely the task data you want to display in the Tasks app can be rendered with the DefaultTaskDetailPresenter. But in case the default presenter is not sufficient you can implement your own presenter and have it render whatever view is needed.

To implement a custom presenter, extend or use 

In your implementation, you can access the task object as well as its definition using injection:

@Inject
public GroceryTaskPresenter(GroceryView view, TaskUiDefinition definition, Task task) {
	...
}

Configuring bulk actions

The abort ,  archive and claim tasks can be configured as bulk-actions as per default user roles. Specify the user roles for the tasks via the bulkActions node in the configuration of the ui-admincentral module.

The tree below shows the default setting for the archive action (the definition class is info.magnolia.ui.admincentral.shellapp.pulse.task.action.ArchiveTasksActionDefinition) with the superuser role set to access this action:

To allow bulk actions for other users, add their role names from the list of default roles as the properties and values of the roles subnode.

See Action definition for more details about action properties.