The message receiver is the target that receives the message.Ī call usually has a label to indicate what message is being sent including any parameters that are passed along with it. This allows you to recognize it as such and interact with it (e.g. If a found message has no call or return label, its call and return arrows will be hidden.Ī hidden call arrow will be invisible when the diagram is exported to a graphics file or exported to the clipboard, but is drawn very faintly on-screen. If there is no flow of control at the time the message is sent, it will be displayed as a found message. This feature ensures that all interactions are well-formed. the target where the message originates) based on the time at which the message is sent. Trace Modeler will automatically determine a message's sender (i.e. Message senderĪt any given time in a control flow, only one target can possibly send a message. Such hidden arrows will be invisible when the diagram is exported to a graphics file or exported the clipboard, but they will be drawn very faintly on-screen to allow you to interact with them. Note that the message return arrow may be hidden depending on the ' Empty returns' diagram style setting. Trace Modeler lays out message arrows and activations automatically based on the positions of sender and receiver and the ' Message spacing', ' Activation width', ' Layout direction' and ' Found call length' properties of a diagram style. The message return is also shown with an arrow. Message calls are shown as arrows on the diagram, different arrows are used to distinguish the different kinds of messages. the return from the message, optionally with a returned value.the activation in the receiver of the message.message calls) between targets.Ī message call consists of three elements : Be sure to visit the Trace Modeler website for updates and UML sequence diagram resources! MessagesĪll communication in an interaction happens by message passing (i.e.
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