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21.5. Message

A message is a communication between two instances of an association role on a specification level collaboration diagram. It describes an action which will generate the stimulus associated with the message. On a collaboration diagram a message is associated with an association role. In the UML metamodel Message is a sub-class of ModelElement.

The message is represented on a collaboration diagram in ArgoUML by its sequence number separated by a colon from the expression defining the associated action. It is accompagnied by an arrow pointing in the direction of the communication, i.e. the direction of the AssociationRole. By convention the name of a message is not shown on the diagram. Instead the diagram displays the message sequence number, either as an integer or as a decimal number to show hierarchy.

[Warning]Warning

The current release of ArgoUML does not retaining message positioning after reloading the project, i.e. as if the positions were not stored in the project file.

21.5.1. Message Details Tabs

The details tabs that are active for messages are as follows.

ToDoItem

Standard tab.

Properties

See Section 21.5.2, “Message Property Toolbar” and Section 21.5.3, “Property Fields For Message” below.

Documentation

Standard tab.

Presentation

Standard tab. The values for the bounds of the message define the bounding box of the message. The Line field defines the arrow color. Increasing the Shadow size has an esthetically questionable effect.

[Caution]Caution

In the V0.18 release of ArgoUML changing the position of the message by editing the values of the Bounds field is possible, but will make only a temporary change to the position of the message, as described above.

Source

Standard tab, showing the message number and action expression separated by a colon (when UML 1.4 is selected in the drop-down).

[Caution]Caution

A message probably should not generated any code of itself. That should be left to the action and possibly stimulus associated with it. In any case changes to this tab are ignored.

Tagged Values

Standard tab. In the UML metamodel, Message has the following standard tagged values defined.

  • derived (from the superclass, ModelElement). Values true, meaning the message is redundant—it can be formally derived from other elements, or false meaning it cannot.

    [Note]Note

    Derived messages still have their value in analysis and design to introduce useful names or concepts, and in design to avoid re-computation.

[Note]Note

The UML Element metaclass from which all other model elements are derived includes the tagged element documentation which is handled by the documentation tab under ArgoUML

21.5.2. Message Property Toolbar

Go up

Navigate up through the package structure.

New Action

This creates a new Action (see Section 20.3, “Action”) for the selected object, navigating immediately to the properties tab for that action.

New Stereotype

This creates a new Stereotype (see Section 16.6, “Stereotype”) for the selected message, navigating immediately to the properties tab for that stereotype.

Delete

This deletes the message from the model

[Warning]Warning

This is a deletion from the model not just the diagram. To delete an message from the diagram, but keep it within the model, use the main menu Remove From Diagram (or press the Delete key).

21.5.3. Property Fields For Message

Name

Text box. The name of a message is usually its sequence number, either an integer, or a decimal (allowing alternative message hierarchies to be clearly described). ArgoUML will supply an integer sequence number by default.

Stereotype

Drop down selector. Message has no stereotypes by default in the UML standard.

Navigate Stereotype

icon. If a stereotype has been selected, this will navigate to the stereotype property panel (see Section 16.6, “Stereotype”).

Interaction

Text box. Records the Interaction of which the message is a part.

Button 1 double click on the entry will navigate to the interaction.

Sender

Text box. Identifies the classifier role which sent this message.

Button 1 double click navigates to the sender classifier role.

Receiver

Text box. Identifies the classifier role which receives this message.

Button 1 double click navigates to the receiver classifier role.

Activator

Drop down selector. Identifies the message which invokes the behavior that causes the sending of this message.

Button 1 click allows selecting the message.

Action

Text box. Lists the action (see Section 20.3, “Action”) this message invokes to raise a stimulus.

Button 1 double click navigates to the selected action, button 2 gives a pop up menu with the following entry.

  • New. Add a new action.

    This item is downlighted if an action already exists.

Predecessors

Text area. Identifies the messages, the completion of whose execution enables this message.

Button 1 double click navigates to the selected message, button 2 gives a pop up menu with one entry.

  • Add. Opens a dialog box that allows to select any number of messages. See figure below.

    This entry is grayed out when no messages exist.

    Figure 21.3. The “add predecessors” dialog box

    The add predecessors dialog box