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Questions and Answers
What is the primary goal of GRASP patterns?
What is the primary goal of GRASP patterns?
- To create obligations for classifiers
- To document what expert designers know intuitively
- To provide a methodical approach to learning basic object design (correct)
- To avoid accidents in software development
What is the definition of a responsibility in the context of UML?
What is the definition of a responsibility in the context of UML?
- A principle of object-oriented design
- A type of design pattern
- A contract or obligation of a classifier (correct)
- A classification of an object's behavior
What is the name of the person who created the GRASP acronym?
What is the name of the person who created the GRASP acronym?
- Oluwaseun Priscilla Olawale
- Unknown
- Craig Larman (correct)
- Nathaniel Borenstein
What is the main focus of the GRASP patterns?
What is the main focus of the GRASP patterns?
What is the quote about the most likely way for the world to be destroyed referring to?
What is the quote about the most likely way for the world to be destroyed referring to?
How many GRASP patterns are presented and discussed in the text?
How many GRASP patterns are presented and discussed in the text?
What is the significance of GRASP patterns in relation to object design?
What is the significance of GRASP patterns in relation to object design?
What is the primary objective of using GRASP patterns?
What is the primary objective of using GRASP patterns?
What is the primary goal of the Low Coupling pattern?
What is the primary goal of the Low Coupling pattern?
Which GRASP pattern is responsible for assigning responsibilities to classes based on the information they possess?
Which GRASP pattern is responsible for assigning responsibilities to classes based on the information they possess?
What is the purpose of the Controller pattern?
What is the purpose of the Controller pattern?
Which class should be responsible for calculating interest on a bank account, according to the Information Expert pattern?
Which class should be responsible for calculating interest on a bank account, according to the Information Expert pattern?
What is the primary purpose of the Observer pattern in the context of GRASP patterns?
What is the primary purpose of the Observer pattern in the context of GRASP patterns?
According to the Creator pattern, which class(es) should be responsible for creating instances of a new bank account?
According to the Creator pattern, which class(es) should be responsible for creating instances of a new bank account?
What is the primary goal of the High Cohesion principle?
What is the primary goal of the High Cohesion principle?
Which GRASP pattern is responsible for assigning responsibilities to classes based on their ability to handle system events or coordinate activities?
Which GRASP pattern is responsible for assigning responsibilities to classes based on their ability to handle system events or coordinate activities?
What is the primary focus of the 'doing' responsibilities of an object?
What is the primary focus of the 'doing' responsibilities of an object?
According to the GRASP pattern 'Information Expert', what is the primary consideration for assigning a responsibility to a class?
According to the GRASP pattern 'Information Expert', what is the primary consideration for assigning a responsibility to a class?
What type of pattern is the GRASP pattern 'Creator' an example of?
What type of pattern is the GRASP pattern 'Creator' an example of?
What is the primary difference between 'knowing' and 'doing' responsibilities?
What is the primary difference between 'knowing' and 'doing' responsibilities?
What is the purpose of a GRASP pattern?
What is the purpose of a GRASP pattern?
How many GRASP patterns are mentioned in the text?
How many GRASP patterns are mentioned in the text?
What is the primary principle of the GRASP pattern 'Controller'?
What is the primary principle of the GRASP pattern 'Controller'?
What is the primary characteristic of a 'knowing' responsibility?
What is the primary characteristic of a 'knowing' responsibility?
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Study Notes
GRASP Patterns
- GRASP (General Responsibility Assignment Software Patterns) is an acronym created by Craig Larman to encompass nine object-oriented design principles related to creating responsibilities for classes.
- GRASP patterns are a learning aid to help talk about and methodically do fundamental object design.
- The assignment of responsibilities and design of collaborations are very important and creative steps during design.
Responsibilities
- A responsibility is a contract or obligation of a classifier.
- There are two types of responsibilities:
- Doing: includes doing something itself, initiating action in other objects, controlling and coordinating activities in other objects.
- Knowing: includes knowing about private encapsulated data, knowing about related objects, knowing about things it can derive or calculate.
GRASP Patterns (Examples)
- Information Expert: Assign a responsibility to the class that has the information needed to fulfill it.
- Creator: Assign the responsibility of creating instances of a class to the class that has the most knowledge about when and how to create them.
- Low Coupling: Aims for classes to have minimal dependencies on each other, facilitating easier maintenance and flexibility in the system.
- Controller: Assign the responsibility of handling system events or coordinating activities to a controller class.
Other GRASP Patterns
- High Cohesion: Promotes high cohesion within a class.
- Polymorphism: Supports variation in behavior.
- Pure Fabrication: Creates a new class that does not represent a real-world concept.
- Indirection: Provides an intermediate object to reduce coupling between classes.
- Protected Variations: Anticipates and protects against variations in the system.
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