This above diagram shows the sequence that messages are passed between objects to complete a use case for ordering an item. Most UML Tools like Magic Draw or Enterprise Architect allow you to define an abstract (displayed) condition and to enter the actual condition in form of code snippets or pseudo code in some. If the item is it sends a message back to the Order Entry Window object stating that the object is out of stack.įigure 4: A Sequence Diagram with conditional message If thats a good idea or not depends on the detail level you want to show in your your diagram and what the reader expects. The next diagram adds another conditional message to the Order object. Next the Order object checks to see if the item is in stock and if the condition is met it sends a message to create a new Delivery Item object. However the colon is required to denote that it is the name of an object following the objectName: className naming system. The names of the classes the objects belong to do not have to be listed. Notice the names of the objects are followed by a colon. The object an Order Entry Window is created and sends a message to an Order object to prepare the order. The next diagram shows the beginning of a sequence diagram for placing an order. For example, a has to be met before the object of class 2 can send a message() to the object of class 3. The condition is listed between brackets next to the message. This diagram also shows conditions for messages to be sent to other object. The represents when the object is destroyed. The vertical rectangles represent when a particular object has control. Tujuan utama dari pembuatan diagram urutan adalah untuk mengetahui urutan kejadian yang dapat menghasilkan output yang diinginkan. The vertical rectangles denote the objects activation while the vertical dashed lines represent the life of the object. Messages pass between the different objects until the object of class 1 receives the final message.īelow is a slightly more complex example. The example below shows an object of class 1 start the behavior by sending a message to an object of class 2. The following interactions take place during this sequence when a customer wants to place. Lets use the example of a fast-food restaurants ordering system to understand how a sequence diagram works. The diagrams are read left to right and descending. In complex sequence diagrams, you can add Alternatives, Options, and Loops to represent different sequences. Sequence diagrams demonstrate the behavior of objects in a use case by describing the objects and the messages they pass.
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