Deployment and Deployment Diagrams

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Deployment and Deployment Diagrams

• Keng Siau
• University of Nebraska-Lincoln

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Node

• A node is a physical element that exists at run
  time and represents a computational resource,
  generally having at least some memory and, often,
  processing capability
• Use nodes to model the topology of the hardware
  on which your system executes
• A node typically represents a processor or a
  device on which artifacts may be deployed

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Node
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Architect a Software-Intensive System

• Consider both logical and physical dimensions
• Logical side classes, interfaces,
  collaborations, interactions, state machines
• Physical side
• Artifacts
• Physical packaging of logical things
• Nodes
• Hardware on which artifacts are deployed and
  executed

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Node

• A node name may be text consisting of any number
  of letters, numbers, and certain punctuation
  marks
• Two types of names
• Simple name e.g., kiosk_7, Sales
• Qualified name e.g., serverbackup
• Node name prefixed by the name of the package in
  which that node lives

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Simple and Qualified Names
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Nodes and Artifacts

• Similarities
• Both have names
• May participate in dependency, generalization,
  and association relationships
• May be nested
• May have instances
• May be participants in interactions

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Nodes and Artifacts

• Differences
• Artifacts are things that participate in the
  execution of a system nodes are things that
  execute artifacts
• Artifacts represent the physical packaging of
  otherwise logical elements nodes represent the
  physical deployment of artifacts

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Nodes and Artifacts
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Organizing Nodes

• Organize nodes by grouping them in packages
• Can organize nodes by specifying dependency,
  generalization, and association (including
  aggregation) relationships between them

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Connections

• Most common kind of relationship is an
  association
• Represents a physical connection among nodes

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Modeling Processors and Devices
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Modeling Distribution of Artifacts
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Deployment Diagrams

• Deployment diagrams are one of the two kinds of
  diagrams used in modeling the physical aspects of
  an object-oriented system
• A deployment diagram shows the configuration of
  run time processing nodes and the artifacts that
  live on them

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Deployment Diagrams

• Use deployment diagrams to model the static
  deployment view of a system
• Involves modeling the topology of the hardware on
  which the system executes
• Deployment diagrams are essentially class
  diagrams that focus on a systems nodes

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Deployment Diagrams

• Graphically, a deployment diagram is a collection
  of vertices and arcs
• Deployment diagrams commonly contains
• Nodes
• Dependency and association relationships
• May contain notes and constraints

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Example of Deployment Diagram
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Common Uses of Deployment Diagrams

• To model embedded system
• To model client/server systems
• To model fully distributed systems

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Modeling Embedded System
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Modeling Client/Server System
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Modeling Fully Distributed System