In software engineering, a sequence diagram shows process interactions arranged in time sequence. This diagram depicts the processes and objects involved and the sequence of messages exchanged as needed to carry out the functionality. Sequence diagrams are typically associated with use case realizations in the 4+1 architectural view model of the system under development. Sequence diagrams are sometimes called event diagrams or event scenarios.
For a particular scenario of a use case, the diagrams show the events that external actors generate, their order, and possible inter-system events.[1] ; the diagram places emphasis on events that cross the system boundary from actors to systems. A system sequence diagram should be done for the main success scenario of the use case, and frequent or complex alternative scenarios.
There are two kinds of sequence diagram:
Sequence Diagram (SD) A regular version of sequence diagram describes how the system operates, every object within a system is described specifically.
System Sequence Diagram (SSD) All systems are treated as a black box, where all classes owned by the system are not depicted. Instead, only an object named System is depicted.
types of interaction diagrams: Sequencediagram Communication diagram Interaction overview diagram Timing diagram A Communication diagram models the interactions...
minimize the dependencies on a subsystem. See also the UML class and sequencediagram below. A Facade is used when an easier or simpler interface to an underlying...
independently by defining new iterators. See also the UML class and sequencediagram below. The essence of the Iterator Pattern is to "Provide a way to...
subject or its proxy. See also the UML class and sequencediagram below. In the above UML class diagram, the Proxy class implements the Subject interface...
interface, that is, implement (encapsulate) an algorithm. The UML sequencediagram shows the runtime interactions: The Context object delegates an algorithm...
many types of diagrams which can be roughly divided into three main groups: behavior diagrams, interaction diagrams, and structure diagrams. The creation...
creating and assembling the ProductA1 and ProductB1 objects. The UML sequencediagram shows the run-time interactions: The Director object calls buildPartA()...
request is carried out. See also the UML class and sequencediagram below. In the above UML class diagram, the Invoker class doesn't implement a request directly...
A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since prehistoric times on walls of caves...
1316, NGC 2787, NGC 5866, Centaurus A. On the right of the Hubble sequencediagram are two parallel branches encompassing the spiral galaxies. A spiral...
have no explicit knowledge of each other. See also the UML class and sequencediagram below. The essence of the mediator pattern is to "define an object...
Unified Modeling Language class and sequencediagram below. In the above Unified Modeling Language class diagram, an abstraction (Abstraction) is not...
interface by synchronizing their state with subject's state. The UML sequencediagram shows the runtime interactions: The Observer1 and Observer2 objects...
structure by adding new visitor objects. See also the UML class and sequencediagram below. The Gang of Four defines the Visitor as: Represent[ing] an operation...
removed at run-time. See also the UML class and sequencediagram below. In the above UML class diagram, the Client class refers to the Prototype interface...
on the main sequence. After the hydrogen fuel at the core has been consumed, the star evolves away from the main sequence on the HR diagram, into a supergiant...
A use case diagram is a graphical depiction of a user's possible interactions with a system. A use case diagram shows various use cases and different types...
violating its encapsulation. See also the UML class and sequencediagram below. In the above UML class diagram, the Caretaker class refers to the Originator class...
In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a...
contain interaction diagrams. The interaction overview diagram is similar to the activity diagram, in that both visualize a sequence of activities. The...
functionality of an object dynamically at run-time. See also the UML class and sequencediagram below. The decorator pattern can be used to extend (decorate) the functionality...
Activity diagrams are graphical representations of workflows of stepwise activities and actions with support for choice, iteration and concurrency. In...
(encapsulate) the state-specific behavior for each state. The UML sequencediagram shows the run-time interactions: The Context object delegates state-specific...
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