Matakuliah
Tahun
Versi
: M0086/Analisis dan Perancangan Sistem Informasi
: 2005
:5
Pertemuan 23
Sequence Diagram
1
Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Mahasiswa dapat Menerangkan Sequence
Diagram (C2)
• Mahasiswa dapat Membuat diagram / skema
Sequence (C4)
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Outline Materi
•
•
•
•
•
Konsep dasar dan Notasi
Time Constrains
Branching and Recursion
Dialoque Management (Interface Classes)
Modelling real-time systems and
concurrency
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What is Sequence Diagram?
• Sequence Diagram is a dynamic model of a use
case, showing the interaction among classes
during a specified time period.
• Sequence Diagram is used primarily to show the
interactions between objects in the sequential
order that those interactions occur.
• Illustrates how objects interacts with each other.
• Emphasizes time ordering of messages.
• Can model simple sequential flow, branching,
iteration, recursion and concurrency.
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What is Sequence .. (Cont’s)
• Illustrates how objects interacts with each
other.
• Emphasizes time ordering of messages.
• Can model simple sequential flow,
branching, iteration, recursion and
concurrency.
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Elements of Sequence Diagram
Notasi Object
Nama Object
Object
Lifeline
Activation
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Elements of (Con’t…….)
Notasi
Actor
Actor
Name
Actor (Initiator)
Actor Lifeline
Actor Activation
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Elements of (Con’t…….)
Notasi Bentuk Panah
• filled solid arrowhead
– Procedure call or other nested flow of control. The entire nested
sequence is completed before the outer level sequence resumes.
– The arrowhead may be used to denote
• ordinary procedure calls, but it may also be used to denote
• Concurrently active instances when one of them sends a Signal and
waits for a nested sequence of behavior to complete before it
continues.
• stick arrowhead
– Message ; that is, no nesting of control. The sender dispatches the
Stimulus and immediately continues with the next step in the
execution.
• dashed arrow with stick arrowhead
– Return from procedure call.
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Elements of (Con’t…….)
X-Axis (objects)
Actor
Synchronous
message
:A
:B
Procedure
Call
Y-Axis (time)
Asynchronous
message
Return
 Synchronous message : the caller has to wait for the receiving object to
complete execution of the called operation before it can resume execution.
 Asynchronous message : The caller can execute immediately after sending the
message, it does not has to wait for the recipient to handle the message
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Control information
• Condition
– syntax: ‘[‘ expression ’]’ message-label
– The message is sent only if the condition is true
– example:
• Iteration
– syntax: * [ ‘[‘ expression ‘]’ ] message-label
– The message is sent many times to possibly multiple
receiver objects.
:CompoundShape :Shape
draw()
*draw()
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Recursion in SD
:A
Recursive
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Object Creation
• An object may create another object via a
<<create>> message
:A
<<create>>
:B
Object Contruction
(Object Creation)
Object Destruction
(Object Deletion)
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Branching
• A branch is shown
by multiple arrows
leaving a single
point, each
possibly labeled by
a condition.
• Depending on
whether the
conditions are
mutually exclusive,
the construct may
represent
– conditionality or
– concurrency.
:B
:A
:C
[Gaji >= PKP] Hitung Pajak()
[Gaji < PKP] Hitung Gaji Bersih()
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Contoh
Berdasarkan Use Case Diagram ini kita
akan membuat Sequence Diagram
dan hasilnya adalah sebagai berikut
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Contoh Pembuatan PO
Dari Sequence Diagram ini dapat
Dilihat bentuk dari Class Diagramnya
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To be ConTinue…..
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Object
• Object dalam Sequence Diagram digambar dengan segiempat
yang berisi nama Object yang diberi garis bawah.
– syntax: [Obiect Name][:className]
– Object dapat diberi nama berdasarkan :
• Nama Object saja
• Nama Class Saja
:Matakuliah
OOAD
• Gabungan Nama Class dan Nama Object
OOAD:Matakuliah
Back
17
Lifeline
• Tiap obyek juga mempunyai Lifeline
(Biasa disebut juga dengan Timeline /
Garis Waktu) yang direpresentasikan
dengan garis putus-putus dibawah
obyek
• Lifeline menggambarkan waktu selama
Obyek yang diatas bisa berhubungan
dengan obyek lain didalam use case.
Back
18
Activation
• Activation digambarkan dengan bentuk
empat persegi panjang sempit yang
menutupi Lifeline.
• Activation menunjukkan kapan sebuah
object mengirim atau menerima
message.
Back
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Messages
• An interaction between two objects is performed as a
message sent from one object to another (simple
operation call, Signaling, RPC)
• If object obj1 sends a message to another object obj2
some link must exist between those two objects
(dependency, same objects)
• A message is represented by an arrow between the life
lines of two objects.
– Self calls are also allowed
– The time required by the receiver object to process the message
is denoted by an activation-box.
• A message is labeled at minimum with the message
name.
– Arguments and control information (conditions, iteration) may be
included.
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