Page 106 - DCAP308_OBJECT_ORIENTED_ANALYSIS_AND_DESIGN

Object Oriented Analysis and Design

Notes 6. The system boundary is potentially the entire system as defined in the ................... document.
7. In a use case diagram, generalization is shown as a directed arrow with a ...................
arrowhead.

8. The parent use case in an extend relationship can’t be replaced by the ................... use case.

8.2 Procedural Sequence Models

In the previous unit, we saw sequence diagrams comprising independent objects all of which are
active at the same time. An object remains active after sending a message and can reply to other
messages without waiting for a response. This is suitable for high level models.

Did u know? Many of the implementations are procedural and restrict the number of
objects that can execute at a time.

8.2.1 Sequence Diagrams with Passive Objects

Most objects are passive and do not have their own threads of control. Activation shows the time
period during which a call of a method is being processed, including the time when the called
method has invoked another operation.

Example: Figure 8.5 calculates the commission for the stock-brokerage transaction. The
object of transaction obtains a request to calculate its commission. It receives the customer’s
service level from the customer table. Then it asks the rate table to calculate commission according
to the service level, after which the commission value is returned to the caller.
Figure 8.5: Sequence Diagram with Passive Objects

Source:http://elearning.vtu.ac.in/13/ENotes/OOAD/Object %20Oriented%20Modeling%20and
%20Design%20Patterns-%20Lecture%20%20%20Notes-Dr.pdf

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