ANALYSIS MODEL. Analysis Model Actual system development start with this. Aims to structure the system independently of the actual implementation environment.

ANALYSIS MODEL

Analysis Model Actual system development start with this. Aims to structure the system independently of the actual implementation

environment. Focus on the logical structure of the system. Define the stable, robust and maintainable structure that is also extensible. In the information space for this model, the aim is to capture information,

behavior and presentation

Analysis Model

Three types of objects are involved in Analysis Model: Interface Objects Entity Objects Control Objects

Analysis Model

Entity object Interface object Control object

Analysis Model

Interface ObjectsThere are three strategies to identify interface objects:1.They are clearly identified from the system interface descriptions accompanying the requirement model.2.From the actors.3.By reading use case descriptions and extracting the functionality that is interface specific.

Analysis Model

Interface ObjectsConsider the Recycling Case Study

Customer PanelOperator PanelReceipt PrinterAlarm Device

Acquaintance association is a static association between instances and means that an instance knows of the existence of other instance. Instance associations are drawn with solid, directed lines.

Analysis Model Actors:

Customer : Customer panel manage the push buttons(start and

receipt) and slots. Operator:

Operator panel: to change information and to generate daily reports.

Alarm Device: control a signal device, reset button for device. Receipt receiver: (Abstract)

Receipt printer: prints, cut off the paper, call alarm device when paper roll is finished.

Analysis ModelUse case description: Deposit item use case: When the customer returns a deposit item, it is measured by the

system. The measurements are used to determine what kind of can, bottle or crate has been deposited. If accepted, the customer total is incremented, as is the daily total for that specific item type. If the item is not accepted, the light for ‘NOT VALID’ is highlighted on the panel.

When the customer presses the receipt button, the printer prints the date. The customer total is calculated and the following information printed on the receipt for each item type.

Name, number returned, deposit value, total for this type Finally the sum that the customer should receive is printed on

the receipt

Analysis Model

Interface Objects of the Recycling Case Study

Customer PanelOperator PanelReceipt PrinterAlarm Device

Acquaintance association is a static association between instances and means that an instance knows of the existence of other instance. Instance associations are drawn with solid, directed lines.

Analysis ModelInterface ObjectsCardinality: No. of instances that can be associated with the association.Example:The receipt printer must know which alarm device to sound when the paper roll is finished.

Analysis Model

Analysis Model

Consists-of Association• Special type of

acquaintance association

• It states that an object is composed of other objects.

• Example: The interface object ‘customer panel’ is the central interface object.

Analysis Model

Two types of interfaces:• Interfaces to other systems: communication is described in

terms of communication protocols• Interfaces to human user: usually done through Graphical

User Interfaces

How much information and behavior should be tied to an interface ?

Any change to the functionality directly coupled to the interface object should be local to the interface object. Other changes should not effect the interface object.

Analysis ModelWhich part of flow of use cases allocate to interface object?Observe parts with following characteristics: Present information to actor or request info. from him. If actor’s behavior is changed the functionality is changed. Flow is dependent on particular interface type.

Analysis Model

Different strategies for allocating the functionalityComputation dominant control or embedded control:

Place the controlling functionality inside the system, that is, in the control objects and the entity objects.

Dialogue dominant control Place the control functionality in the interface objects.

Mixed control Places the control on both sides allowing invocation of

dialogue from the computational side (control and entity) and interface objects.

Balanced control Separate the control from both the dialogue and the

computation. Control object governs sequencing among invocations of dialogue and computational functions.

OOSE promotes alternative (4)

Analysis Model

Entity Objects Model the information that the system will

handle over a longer period of time. Allocate the behavior that naturally belongs to

this information to them. Look at the information that must be kept for a

longer time. The entity objects can be identified from

Use cases. Problem domain object model

Analysis ModelReturn item Use case:

When the customer returns a deposit item, it is measured by the system. The measurements are used to determine what kind of can, bottle or crate has been deposited. If accepted, the customer total is incremented, as is the daily total for that specific item type. If the item is not accepted, the light for ‘NOT VALID’ is highlighted on the panel.

When the customer presses the receipt button, the printer prints the date. The customer total is calculated and the following information printed on the receipt for each item type:Name, number returned, deposit value, total for this typeFinally the sum that the customer should receive is printed on the receipt.

Analysis Model

Entity objects identified for Recycling Machine Case Study:

Can Crate BottleAttributes relating to

size and no. of each item

deposited for the day. Abstract entity object:

Deposit item with attributes deposit value, day total.

Analysis Model

Attributes: are used by objects to store information. Type-- primitive or composite data type. Is an association with a name and cardinality

indicating attribute type.

Analysis Model

Analysis Model

Attributes: are used by objects to store information. Type-- primitive or composite data type. Is an association with a name and cardinality

indicating attribute type.

Analysis ModelRECEIPT BASIS

one instance of receipt basis for each customer

keep track of all items a customer deposit (how much of each type)

acquaintance association b/w Receipt basis and Deposit item with cardinality [0..n]

an attribute storing no. received for each type

An instance of ‘receipt basis’ has acquaintance association with the instances of ‘deposit item’.

For each association – a no. is assigned (an attribute of relation or new entity object)

Analysis ModelOperations offered by an entity objects: Storing and fetching information Behavior that must be changed if the entity object is

changed Creating and removing the entity objectCommunication Association Operation on an entity object may mean that the entity

object contacts another entity object and asks for information about something

It models communication between two objects. It starts from object that is to perform manipulation. It is directed to object where manipulation is to take

place. Instance association—solid line