Decision Task

Decision Task
A DecisionTask can be used in the Case to invoke a Decision.
— CMMN 1.1 Standard, 5.4.10.7, Decision Task

Decision Tasks are used to execute Business Rules encoded in DMN tables. You only have to indicate a Decision Table Reference, the mapping of the variable is configured in the Decision Table.

Each input in the Decision Table is mapped to a variable which must be available in the process. The same is true for the output columns which not necessarily have to exist.

Once the task is activated, the inputs are checked according to the Hit Policy defined in the table. If at least one rule matches, the values of the output columns are stored in the variables indicated in the table.

Attributes

Group Attribute Description

General

ID

A unique ID for the element. The ID is used to refer to a model element from outside of the diagram (for example, from a CMMN Action button in a form or when referring to a model element, such as plan item ID, in a CMMN REST call). For convenience, this ID can be edited.

Name

The name of the element. This is the name displayed in the diagram. If no run-time name is specified, this name is also used in the running case.

Description

The description attribute additionally adds a description to the component.

Documentation

Documentation intended to explain concepts of its use for future reference.

Details

Decision table ref.

Decision Table Reference to set for decision task.

Asynchronous

When enabled, the behavior of the plan item is executed as an asynchronous job. This happens when the plan item transitions to the ACTIVE state. During the execution of the behavior, the plan item is set to an intermediate ASYNC_ACTIVE state.

Throw error if no rules were hit

Determines whether an error should be thrown if no rules of the decision table were hit and consequently no result was found.

Fallback to default tenant

Indicates that the Decision task is created with the default tenant if it is not available on the current tenant. This is only relevant if the application is running in a multi-tenant setup.

Required

Select this option to mark the element as required (exclamation mark decorator).

Required plan items must either be in the state COMPLETED, TERMINATED or DISABLED for their parent stage to complete.

Repetition

Select this option to mark the element as repeatable (number sign decorator).

By default, only one instance of a plan item may be created at runtime. Repeatable plan items do not have that limitation.

The combination of this property, Manual activation and no entry sentry has a special meaning called Automatic repetition: As a previous instance of the plan item completes, a new instance is automatically created and set into state Enabled.

Completion neutral

Completion neutral influences the plan item’s parent stage completes.

Plan items in the state AVAILABLE may prevent the parent stage (or case) from automatically completing. By checking this property, the plan item behaves neutral with respect to the completion of the parent container.

Activation

Manual activation

Select this option to mark the element to have Manual activation (right arrow 'play' decorator).

Plan items with Manual activation move from state AVAILABLE to state ENABLED once they trigger. A plan item in state ENABLED exposes an action button that allows the user to manually start the plan item.

More

Lifecycle listeners

Allows you to define lifecycle listeners for a plan item. Lifecycle listeners allow you to execute an expression, a delegate expression or a class when a plan item transitions from one state to another.

Visual

Font weight

The font weight of the element in the diagram.

Font size

The font size of the element in the diagram.

Font color

The font color of the element in the diagram.

Font style

The font style of the element in the diagram.

Background color

The background color of the element in the diagram.

Border color

The border color of the element in the diagram.