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Questions and Answers
What is the primary focus of Collaboration Diagrams?
What is the primary focus of Collaboration Diagrams?
What type of line is used to depict links between objects and actors in Collaboration Diagrams?
What type of line is used to depict links between objects and actors in Collaboration Diagrams?
What is an instance where messages can be sent between objects and actors?
What is an instance where messages can be sent between objects and actors?
What is typically required to fully describe the behavior of a system?
What is typically required to fully describe the behavior of a system?
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What is conveyed through messages between objects in Collaboration Diagrams?
What is conveyed through messages between objects in Collaboration Diagrams?
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What is an actor in Collaboration Diagrams?
What is an actor in Collaboration Diagrams?
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What does the thin rectangle on a lifeline represent in a sequence diagram?
What does the thin rectangle on a lifeline represent in a sequence diagram?
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What is the purpose of a note in a sequence diagram?
What is the purpose of a note in a sequence diagram?
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What is another name for a collaboration diagram?
What is another name for a collaboration diagram?
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What type of message represents the invocation of an operation of the same lifeline?
What type of message represents the invocation of an operation of the same lifeline?
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What type of message represents the pass of information back to the caller of a corresponding former message?
What type of message represents the pass of information back to the caller of a corresponding former message?
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What is the representation of an individual participant in a sequence diagram?
What is the representation of an individual participant in a sequence diagram?
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What type of message represents the request of destroying the lifecycle of a target lifeline?
What type of message represents the request of destroying the lifecycle of a target lifeline?
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What type of message represents the instantiation of a target lifeline?
What type of message represents the instantiation of a target lifeline?
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What is the primary purpose of a Collaboration Diagram?
What is the primary purpose of a Collaboration Diagram?
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What is the term for the relationships between objects in a Collaboration Diagram?
What is the term for the relationships between objects in a Collaboration Diagram?
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What is the notation used to represent objects in a Collaboration Diagram?
What is the notation used to represent objects in a Collaboration Diagram?
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What is the term for the communication between objects in a Collaboration Diagram?
What is the term for the communication between objects in a Collaboration Diagram?
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What is the purpose of creating an instance level Collaboration Diagram?
What is the purpose of creating an instance level Collaboration Diagram?
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What is the term for the collection of named objects and actors with links connecting them?
What is the term for the collection of named objects and actors with links connecting them?
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What is the purpose of creating a specification level Collaboration Diagram?
What is the purpose of creating a specification level Collaboration Diagram?
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What is the term for the emergent desirable functionalities that arise from the collaboration of objects?
What is the term for the emergent desirable functionalities that arise from the collaboration of objects?
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Study Notes
Sequence Diagram Notations
- A lifeline represents an individual participant in the interaction.
- An activation is a thin rectangle on a lifeline, representing the period during which an element is performing an operation.
- The top and bottom of the rectangle are aligned with the initiation and completion time, respectively.
Message Types
- Call message: represents an invocation of an operation of a target lifeline.
- Return message: represents the pass of information back to the caller of a corresponding former message.
- Self message: represents the invocation of a message of the same lifeline.
- Recursive message: represents the invocation of a message of the same lifeline, with the target pointing to an activation on top of the activation where the message was invoked from.
- Create message: represents the instantiation of a target lifeline.
- Destroy message: represents the request of destroying the lifecycle of a target lifeline.
- Duration message: shows the distance between two time instants for a message invocation.
Notes
- A note (comment) gives the ability to attach various remarks to elements.
- A comment carries no semantic force, but may contain information that is useful to a modeler.
Collaboration Diagrams
- Collaboration diagrams are illustrations of the relationships and interactions among software objects.
- They show the structural organization of objects and their interactions.
- Actors are instances that invoke the interaction in the diagram, with a name and a role.
- Links connect objects with actors and are depicted using a solid line between two elements.
- Messages between objects are shown as labeled arrows placed near a link.
Sequence vs. Collaboration Diagrams
- Sequence diagrams focus on the order of messages that flow between objects.
- Collaboration diagrams visualize the structural organization of objects and their interactions.
Collaboration
- A collaboration is a collection of named objects and actors with links connecting them.
- A collaboration defines a set of participants and relationships that are meaningful for a given set of purposes.
- Objects collaborate by communicating (passing messages) with one another in order to work together.
Steps for Creating Collaboration Diagrams
- Identify behavior whose realization and implementation is specified.
- Identify the structural elements (class roles, objects, subsystems) necessary to carry out the functionality of the collaboration.
- Decide on the context of interaction: system, subsystem, use case, and operation.
- Model structural relationships between those elements to produce a diagram showing the context of the interaction.
- Consider alternative scenarios that may be required.
- Draw instance-level collaboration diagrams, if required.
- Optionally draw a specification-level collaboration diagram to summarize the alternative scenarios in the instance-level sequence diagrams.
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Description
This quiz covers the basics of sequence diagram notations, including lifelines, activations, and call messages.
