Sequence diagram example

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Sequence diagram example




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Sequence diagram example

T120B029

P7

2012 pavasaris

Slide2

What is the purpose of sequence diagram ?

The sequence diagram is used primarily to show the

interactions between objects

in the sequential order that those interactions occur.

Developers think sequence diagrams were meant exclusively for them

:-)

Business staff can find sequence diagrams useful to communicate how the business currently works by showing how various

business objects interact

.

A business-level sequence diagram can be used as a

requirements document

.

During the requirements phase use cases are often refined into

one or more sequence diagrams

.

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Sequence vs. Activity?

Little bit later…

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Notation 1/

An empty frameLifeline

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Notation 2

Sending a message/methos to another objectThe name is placed above the arrowed lineAnd represents an operation/method that the receiving object's class implements.

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Notation 3

Return messages – optionalThe use of return messages depends on the level of detail/abstractionReturn value is placed above dotted line

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Notation 4

Sending a message to itselfthe model draws attention to the fact that this processing takes place in the system object.

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Notation 5

Asynchronous message

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Notation 6

Who will guard the guardians themselves?Who will guard the guardians themselves

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Combined fragments (alternatives, options, and loops)

A combined fragment is used to group sets of messages together to show

conditional flow

in a sequence diagram.

Alternatives - classic "if then else" logic

Options - a simple "if then" without “else”

Loops – a repetitive sequence

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Alternatives

mutually exclusive choice between messages

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Option

used to model a sequence that, given a certain condition, will occur; otherwise, the sequence does not occur.

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Loops

does not require guard condition be placed on ita guard can have two special conditionsMinint = 1, Maxint = 5

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Breaks

most commonly used to model exception handlingcause the exiting of an enclosing interaction's sequence. In cases where a break is part of combined fragment, then only that fragment is exited.

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Nested diagrams

Referencing another sequence diagram

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Sequence(SD) vs. activity (AD)?

AD mainly represent process flows.

SD mainly represent

step by step

ordered in time interaction between different objects.

AD also repersents an object role in workflow but level of repersenation is not dynamic like SD.

Example: Object lifeline and detailed sequence of interaction

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Online bookshop example

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Facebook user authentication in a Web application

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Submit comments (AJAX)

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