![sequence diagram if condition sequence diagram if condition](https://i.stack.imgur.com/V9uz5.png)
![sequence diagram if condition sequence diagram if condition](https://i.stack.imgur.com/hbL9A.png)
Use a class diagram to make a general model of the structure of an application that specifies the system's classes, its attributes and methods, and the relationships between objects.Ĭreate a UML class diagram Component diagrams This subscription version of Visio supports UML shapes conforming to the UML 2.5 specification while also providing you the flexibility to use them as needed in your diagrams. If so, the user is added to that group meeting's list of participants.In Visio Plan 2 and Visio 2019, you can start with a blank UML template or (in some cases) modify a UML starter diagram. If the user enters an appointment with the same name and duration as an existing group meeting, the calendar asks the user whether he/she intended to join that group meeting instead. If the user already has an appointment at that time, the user is shown a warning message and asked to choose an available time or replace the previous appointment. Any reminder selected by the user is added to the list of reminders. The calendar records the new appointment in the user's list of appointments. The UI will prevent the user from entering an appointment that has invalid information, such as an empty name or negative duration. The user enters the necessary information about the appointment's name, location, start and end times. The UI notices which part of the calendar is active and pops up an Add Appointment window for that date and time.
![sequence diagram if condition sequence diagram if condition](https://i.stack.imgur.com/5LYmr.png)
Let's do a sequence diagram for the following casual use case, Add Calendar Appointment : The scenario begins when the user chooses to add a new appointment in the UI. If that player also cannot afford the ante, this cycle continues until such a player is found or all players are removed. If the player left of the dealer doesn't have enough money to ante, he/she is removed from the game, and the next player supplies the ante. Next each player is dealt a hand of two cards from the deck in a round-robin fashion one card to each player, then the second card. The player left of the dealer supplies an ante bet of the proper amount.
![sequence diagram if condition sequence diagram if condition](https://i.pinimg.com/originals/8d/8b/85/8d8b852be73634bdbe8b42bd6e6e13ae.png)
All players' hands are emptied into the deck, which is then shuffled. The UI asks whether any new players want to join the round if so, the new players are added using the UI. Let's do a sequence diagram for the following casual use case, Start New Poker Round : The scenario begins when the player chooses to start a new round in the UI. So why not just code up that algorithm rather than drawing it as a sequence diagram? a good sequence diagram is still a bit above the level of the real code (not all code is drawn on diagram) sequence diagrams are language-agnostic (can be implemented in many different languages non-coders can do sequence diagrams easier to do sequence diagrams as a team can see many objects/classes at a time on same page (visual bandwidth) What's wrong with this sequence diagram? (Look at the UML syntax and the viability of the scenario.)ġ4 Why not just code it? Sequence diagrams can be somewhat close to the code level. What can you say about the control flow of each of the following systems? Is it centralized? Is it distributed? If one sequence diagram is too large or refers to another diagram, indicate it with either: an unfinished arrow and comment a "ref" frame that names the other diagram when would this occur in our system? Notice that an object created after the start of the scenario appears lower than the others deletion: an X at bottom of object's lifeline Java doesn't explicitly delete objects they fall out of scope and are garbage-collectedĪctivation: thick box over object's life line drawn when object's method is on the stack either that object is running its code, or it is on the stack waiting for another object's method to finish nest to indicate recursion Activation Nestingįrame: box around part of a sequence diagram to indicate selection or loop if -> (opt) if/else -> (alt), separated by horizontal dashed line loop -> (loop) Message (method call) indicated by horizontal arrow to other object write message name and arguments above arrowĥ Messages, continued message (method call) indicated by horizontal arrow to other object dashed arrow back indicates return different arrowheads for normal / concurrent (asynchronous) methodsĦ Lifetime of objects creation: arrow with 'new' written above it Participant: an object or entity that acts in the sequence diagram sequence diagram starts with an unattached "found message" arrow message: communication between participant objects the axes in a sequence diagram: horizontal: which object/participant is acting vertical: time (down -> forward in time)ģ Representing objects Squares with object type, optionally preceded by object name and colon write object's name if it clarifies the diagram object's "life line" represented by dashed vert. Presentation on theme: "Sequence Diagram."- Presentation transcript: