Do You Know Sequence Diagram ???
Sequence diagram is an interaction diagram that
shows how processes operate with one another and in what order . It is a
construct of a Message Sequence Chart . Sequence diagram shows object
interactions arranged in a time sequence . It describes the objects and classes
involved in the scenario and the sequence of messages exchanged between the
objects needed to carry out the functions of the scenario . Sequence diagrams
are usually associated with the realization of a use case in the Logical View
of the system being developed . Sequence diagrams are sometimes called event
diagrams , event scenarios.
A sequence diagram shows , as parallel vertical
lines ( lifelines ) , different processes or objects that live simultaneously ,
and , as horizontal arrows , the messages exchanged between them , in the order
in which they occur . This allows the specification of simple runtime scenarios
graphically .
According to Whitten , Bentley , and Dittman (2004 ,
p702 ) Sequence diagram is a UML diagram that models the logical aspects of the
use casedengan describe the interaction of messages - messages between objects
in a time sequence . Sequence diagrams menunjakkansecar detail how objects
interact with each other in a time sequence , read from top to bottom
sequentially follow the logic of the use case . Posts of steps - steps usecase
can be written in pseudoceode on the left of the diagram for easy reading treat
.
Behavior or operations to be performed
by each object is described code . The arrows represent the interaction between
a line or a message sent to a specific object to invoke operations to meet the
demand .
The purpose
of the use of sequence diagrams:
1.
Communicate
requirements to the technical team for this diagram can be easier to become a
model elaborated design.
2.
Diagram is
the most suitable to develop use-case model description into a design
specification.
Use of Time
sequence diagram:
1.
In the
discovery stage: Sequence diagram of the selected use case created by the
Business Analyst.
2. In the construction
phase: System analyst using use case and sequence diagrams created by the
Business Analyst as inputs for manufacture of technical sequence diagrams which
will be reviewed by the Business Analyst.
3.
At the final
stage of verification and validation: a sequence diagram is used to design the
test of a use-case scenario.
Basic steps for drawing sequence
1. On the Architecture menu, click New Diagram.
- Under Templates,
click UML Sequence Diagram.
- Name the diagram.
- In Add to Modeling Project, select an existing modeling project in your solution, or Create a new modeling project, and then click OK.
A new sequence diagram appears with the Sequence Diagram toolbox. The
toolbox contains the required elements and connectors.
1. Drag Lifelines from the Toolbox onto the diagram to represent instances of classes, components, actors, or devices.
2. Draw messages to show how the lifelines collaborate to achieve a specific goal.
3. To show a message that comes from an unknown event source, or broadcasts to unknown recipients, draw an asynchronous message from or to blank space on the diagram. These messages are called found messages and lost messages.
4. Draw sequence diagrams for each major message to the same component or system.
I have created a blog about the sequence diagrams . Here I will
explain the sequence diagram that I have made .
In the picture below , there are some which each lifeline lifeline
that is obtained from the previous class diagram that I created . There are
several Life line that is in sequence diagram blog , namely :
1.
Lifeline is
the first user , wherein the user is the user who runs the blog blog . Here the
user can enter , modify , or remove something that users want.
2. Lifeline
second is obtained from a collection usecase . Where the user can input data .
Such as profile data .
3. Lifeline
third is derived from a particular class , where later the user will do
something , such as deleting the data , the data input .
4. Lifeline
fourth is obtained from every table in the class diagram . Will be made to
run the command message .
5.
Lifeline
fifth is obtained from an existing database connection in a class diagram that
all orders will be associated with the database connection .
Here's an example of a Blog That Has Sequence diagram I
create:
1. Input
Profile
Description : From
the picture above shows there lina lifeline is where the contents of each of
the lifeline is seen from the class diagram and usecase diagrams that I created
earlier. The image menggambaran for our input data as the owner of the blog
that will be stored in the database of the blog itself.
2. Create
New Post
Description : From
the picture shows how the flow in creating a new post. Wherein, the user
submits data to be post last postingkan will fill the post that will be created
which will be posted on the blog user.
3. ChangeTemplate
Description : The
image above illustrates how the flow in changing the template. Where users will
memililih user templates as you wish. Then the database will execute the
command from the user. Later, the template will appear in the display user
blogs.
4. Edit
Layout
Description
: From the picture above, a user wants to edit the layout. Where the user will
select the layout that cool until it is replaced, then the user gives the command
to change the layout to suit the desires of the user, then the layout will
change according to user choice earlier.
Description of the Sequence diagrams so blogs I
have created. May be useful for all readers. If there is a less obvious or do
not understand please forgive..
thank you for reading my blog ...
thank you for reading my blog ...
bye bye bye
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