![Control logic in UML 1
• Iteration marker (*) on message
– iteration basis given in “[]”
• Guards
– message conditions in “[]”
• Problem: only works on a single message
– Solution: use self-call by a pseudo message
to show scope](https://image.slidesharecdn.com/sequencediagramscommunicationdiagrams-191121033540/85/Sequence-diagrams-communication-diagrams-12-320.jpg)
![Other conventions
• You can show several computations in one
diagram
– 1.1, 1.2.1, 1.2.2, 1.3, …
– 2.1, 2.2, 2.3.1, 2.3.2,…
• You can use letters to indicate different threads
– A1.1, A1.2.1, A1.2.2,…
– B1.1, B1.2.1, B1.2.2,…
• You can use iteration markers “*” and guards []
to show control logic, but no complete constructs](https://image.slidesharecdn.com/sequencediagramscommunicationdiagrams-191121033540/85/Sequence-diagrams-communication-diagrams-18-320.jpg)
![Dog Fun
• Each customer has one or more dogs
• I keep track of the customers’ kind of dogs and email so I can send them greetings at
Christmas and new offers
[if they want]. I also keep track of how much they have spent
• The system helps me compute how much the customer should pay for the treatments
of the dogs the customer
brings
• A treatment starts with a wash that has a fixed cost of 10$ no matter what kind of dog
• Then there are three kinds of ways to continue a
treatment:
1. puddle-cut which can be NY-style to $100 or London to $50
(London style may include coloring for an extra $10) [I decline to puddle cut a dog that’s not a puddle]
2. trim-cut for $30, or
3. style-cut for $40
• Some of my costumers get a discount of some percent, but not all](https://image.slidesharecdn.com/sequencediagramscommunicationdiagrams-191121033540/85/Sequence-diagrams-communication-diagrams-20-320.jpg)
Sequence diagrams & communication diagrams
- 1. SEQUENCE DIAGRAMS & COMMUNICATION DIAGRAMS By, D. B. Naga Muruga, Dept of Mechanical Engineering Sriram Engineering College
- 2. Class and Object Diagrams UML structure diagrams
- 3. Interaction Diagrams • Describe how objects collaborate to achieve some behavior
- 4. Consider a use case • We have an order • We are going to calculate its price • Order needs to look at all its line items – determine price of line item based on the pricing rules of its product
- 6. Another sequence diagram of the use case
- 7. Creating and deleting participants
- 8. Interaction Frames • Sequence diagrams are not suitable for showing complex control flow • Instead use – pseudocode – activity diagrams • Use interaction frames to describe simple control logic
- 9. Format of interaction frames
- 10. Example
- 12. Control logic in UML 1 • Iteration marker (*) on message – iteration basis given in “[]” • Guards – message conditions in “[]” • Problem: only works on a single message – Solution: use self-call by a pseudo message to show scope
- 14. Synchronous and Asynchronous messages • Synchronous – The sender object must wait for the receiver object to finish – symbol UML 2 UML <1.4 • Asynchronous – The sender object can carry on without waiting – symbol UML 2 UML <1.4
- 15. Communication Diagrams • Focus on the data links between objects • Communication diagrams are graphs – Nodes: Objects – Edges: Association and transient links messages are arrows on links • Communication sequence given by numbering scheme
- 18. Other conventions • You can show several computations in one diagram – 1.1, 1.2.1, 1.2.2, 1.3, … – 2.1, 2.2, 2.3.1, 2.3.2,… • You can use letters to indicate different threads – A1.1, A1.2.1, A1.2.2,… – B1.1, B1.2.1, B1.2.2,… • You can use iteration markers “*” and guards [] to show control logic, but no complete constructs
- 19. • A matter of personal taste • Sequence diagrams better when you want to emphasize sequence of calls • Communication diagrams better when you want to emphasize links How to choose between sequence and communication diagrams
- 20. Dog Fun • Each customer has one or more dogs • I keep track of the customers’ kind of dogs and email so I can send them greetings at Christmas and new offers [if they want]. I also keep track of how much they have spent • The system helps me compute how much the customer should pay for the treatments of the dogs the customer brings • A treatment starts with a wash that has a fixed cost of 10$ no matter what kind of dog • Then there are three kinds of ways to continue a treatment: 1. puddle-cut which can be NY-style to $100 or London to $50 (London style may include coloring for an extra $10) [I decline to puddle cut a dog that’s not a puddle] 2. trim-cut for $30, or 3. style-cut for $40 • Some of my costumers get a discount of some percent, but not all
- 21. Alice visits Dog Fun to have her dog in for a NY-style cut. Show how the visits collection of Alice is updated.